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X-WR-CALNAME:Particle Physics Theory Seminars
X-WR-CALDESC:Particle Physics Theory Seminars
X-PUBLISHED-TTL:PT12H
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Europe/London
X-LIC-LOCATION:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
DTSTART:19810329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
TZNAME:BST
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
DTSTART:19961027T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
TZNAME:GMT
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-78684@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190221T094957
LAST-MODIFIED:20190919T101816
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20190925T140000
DTEND;TZID=Europe/London:20190925T150000
SUMMARY:Calabi-Yau geometry of the N-loop sunset Feynman integrals
DESCRIPTION:In this talk we will discuss the algebraic and transcendental
features of the computation of multiloop sunset Feynman integrals.\n We wi
ll explain how the “creative telescoping” algorithm allows to derive e
fficiently the inhomogeneous differential equations satisfied by any Feynm
an integrals. \n In the case of the sunset integral we will show how the
results can be understood by understanding the geometry and the moduli of
the Calabi-Yau varieties of the sunset graph. In particular how the specia
lization of physical parameters leads to rank jump in the differential equ
ation.\n We will describe the appearance of a motivic elliptic curve in tw
o loop graphs and how this allows to easily derive as differential equatio
n system efficiently.\n This is based on work done in collaboration with
Charles Doran and Andrey Novoseltsev\n\nSpeaker:\n* Pierre Vanhove (IPhT
Saclay)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/78684-calabi-yau-geometry-of-the-n
-loop-sunset-feynman-integrals
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-78738@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190321T124539
LAST-MODIFIED:20191021T124946
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191007T140000
DTEND;TZID=Europe/London:20191007T150000
SUMMARY:Towards solving open problems in quantum field theory: from tensor
networks to quantum computing
DESCRIPTION:There are several problems in quantum field theory which canno
t be solved by conventional Monte Carlo simulation techniques\, i.e. a non
-zero baryon density\, the matter-antimatter asymmetry of the universe and
real time simulations.\n At the example of 1+1 dimensional benchmark mode
ls we will discuss new directions towards overcoming these problems. In pa
rticular\, we will introduce tensor network techniques which are very succ
essful in low dimensions. As another new direction\, we will demonstrate t
hat quantum computing could be a practical way in the future to evaluate t
hese problems through variational quantum simulations.\n\nSpeaker:\n* Karl
Jansen (DESY)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/78738-towards-solving-open-problem
s-in-quantum-field-theory-from-tensor-networks-to-quantum-computing
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79519@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190722T095342
LAST-MODIFIED:20191007T092005
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191016T140000
DTEND;TZID=Europe/London:20191016T150000
SUMMARY:The Rise of SMEFT On-shell Amplitudes
DESCRIPTION:We present a map between the tree-level Standard Model Effecti
ve Theory (SMEFT) in the Warsaw basis and massive on-shell amplitudes. As
a first step\, we focus on the electroweak sector without fermions. We des
cribe the Feynman rules for a particular choice of input scheme and compar
e them with the 3-point massive amplitudes in the broken phase. Thereby we
fix an on-shell basis which allows us to study scattering amplitudes with
recursion relations. We hope to open up new avenues of exploration to a c
omplete formulation of massive EFTs in the on-shell language.\n\nSpeaker:\
n* Camila Machado (Johannes Gutenberg University Mainz)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79519-the-rise-of-smeft-on-shell-a
mplitudes
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79505@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190712T085050
LAST-MODIFIED:20191010T113539
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20191023T140000
DTEND;TZID=Europe/London:20191023T150000
SUMMARY:[CANCELLED] Astrid Eichhorn
DESCRIPTION:tba\n\nSpeaker:\n* Astrid Eichhorn (CP3-Origins)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79505-astrid-eichhorn
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79499@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190710T135617
LAST-MODIFIED:20191029T151610
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191030T130000
DTEND;TZID=Europe/London:20191030T140000
SUMMARY:Precision in effective field theory studies for top quark and Higg
s physics
DESCRIPTION:In this talk I review recent progress in the computation of pr
ocesses involving the Higgs and the top quark in the framework of Standard
Model Effective Theory including higher-order corrections. In particular
I will discuss the impact of QCD corrections and the importance of using t
hese results in a global EFT fit in the top sector. The top and Higgs inte
rplay which manifests through Higgs processes involving top quark loops wi
ll also be discussed.\n\nSpeaker:\n* Eleni Vryonidou (CERN)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79499-precision-in-effective-field
-theory-studies-for-top-quark-and-higgs-physics
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79501@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190710T135756
LAST-MODIFIED:20191104T122006
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191031T140000
DTEND;TZID=Europe/London:20191031T150000
SUMMARY:Double parton scattering in QCD
DESCRIPTION:Double parton scattering (DPS) is the process in which one has
two hard scatterings in an individual proton-proton collision. It can com
pete in rate with single scattering in certain kinematic regions and/or fo
r certain processes\, reveals new information on proton structure\, and be
comes more important as collider energy grows. I will give a broad overvie
w of developments in the theoretical description of double parton scatteri
ng\, beginning with the most simple “pocket formula” approach\, and th
en progressing to the recent development of a full QCD framework for DPS.
I will also discuss calculation of higher order corrections in the QCD fra
mework\, as well as efforts towards implementing this framework as a parto
n shower.\n\nSpeaker:\n* Jonathan Gaunt (CERN)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79501-double-parton-scattering-in-
qcd
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-78769@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190404T093727
LAST-MODIFIED:20190724T144440
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191106T140000
DTEND;TZID=Europe/London:20191106T150000
SUMMARY:Top-mass measurements: renormalons and NLO+PS effects
DESCRIPTION:In this talk I will present some theoretical subtleties of the
\n top-quark mass determination\, issue which persists in being highly\n c
ontroversial. In the first part\, I will discuss the presence of\n linea
r renormalons in observables that can be used to determine the\n top mass.
The second part of the talk is instead devoted to the\n comparison of s
everal NLO generators for top-pair production\,\n implemented in the POWHE
G BOX framework\, that differ by the level of\n accuracy employed to descr
ibe the top decay. The impact of the shower\n Monte Carlo programs that ca
n complete the NLO events generated by\n POWHEG BOX\, Pythia 8.2 and Herwi
g 7.1\, is also studied.\n\nSpeaker:\n* Silvia Ferrario-Ravasio (Durham Un
iversity - IPPP)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/78769-top-mass-measurements-renorm
alons-and-nlops-effects
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79536@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190805T094557
LAST-MODIFIED:20200224T162849
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191113T150000
DTEND;TZID=Europe/London:20191113T160000
SUMMARY:Neutrino scattering at TeV and PeV energies
DESCRIPTION:The precise understanding of neutrino scattering rates at ult
ra-high-energy is becoming an interesting topic due to the experimental pr
ogress at large volume detectors based on Earth. I will discuss the recent
theoretical progress in this topic\, and how it will be relevant for futu
re measurements at detectors such as IceCube and KM3NeT.\n\nSpeaker:\n* Rh
orry Gauld (Nikhef - Amsterdam)
LOCATION:Lecture Theatre A\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79536-neutrino-scattering-at-tev-a
nd-pev-energies
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79548@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190812T160246
LAST-MODIFIED:20191119T091459
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191119T140000
DTEND;TZID=Europe/London:20191119T150000
SUMMARY:Forest formulas for the LHC and beyond
DESCRIPTION: I will begin with a review of the forest formula\, which all
ows to renormalise individual UV-divergent Feynman integrals. Extensions o
f the forest formula can be used to treat also IR-divergences. One such ex
tension is the so-called R*-operation\, which applies to Euclidean Feynman
integrals. It is useful mostly for simplifying the calculation of anomalo
us dimensions. I will give an overview of recent applications\, focusing o
n Mellin moments of splitting functions at N4LO and a certain dimension-6
CP-violating gluonic operator\, called Weinberg's operator\, which appears
in the SM EFT. In the final part of the seminar I will discuss yet anothe
r generalisation of the forest formula which I have developed to deal with
IR-divergences in real emission corrections in perturbative QCD.\n\nSpeak
er:\n* Dr. Franz Herzog (Nikhef - Amsterdam)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79548-forest-formulas-for-the-lhc-
and-beyond
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79459@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190627T090839
LAST-MODIFIED:20191202T104426
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191127T140000
DTEND;TZID=Europe/London:20191127T150000
SUMMARY:Formulating the Kramers Problem in Field Theory
DESCRIPTION:The Kramers problem aims at deriving the rate at which a Brown
ian particle\n escapes from a potential well. In this talk\, I will define
and derive the\n Kramers escape rate for a scalar field\, due to thermal
fluctuations\, and\n discuss the applications for cosmology and other area
s. In the presence of\n such fluctuations\, there is a non-vanishing proba
bility for a field\,\n initially homogeneously located at a minimum of its
potential\, to escape\n from the well. I will start with a review of the
simpler problem of the\n escape of a classical particle due to random forc
es. Then\, I will discuss\n the difficulties associated with a well-define
d formulation of an escape\n rate for a field and how these can be overcom
e. I will attempt to provide\n a definition of the Kramers problem for a s
calar field and present a\n method to obtain the rate. Finally\, I will co
nclude with some applications\n of the formalism not only in cosmology but
also in areas including\n lattice gauge theory and condensed matter physi
cs.\n\nSpeaker:\n* Joel Mabillard (Formerly School of Physics & Astronomy\
, University of Edinburgh)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79459-formulating-the-kramers-prob
lem-in-field-theory
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79819@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191120T091821
LAST-MODIFIED:20191202T104131
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191206T110000
DTEND;TZID=Europe/London:20191206T120000
SUMMARY:Differential equations and iterated integrals for massive multi-lo
op Feynman integrals
DESCRIPTION:In this talk I will give an overview of the differential equat
ions method for the calculation of multi-loop Feynman integrals\, which wa
s recently applied to several cases where massive legs and propagators are
present.\n I will discuss how the systems of differential equations arise
\, how they are brought in canonical form with the help of the Magnus expo
nential\, what functions can be used to give a closed-form representation
of the solution\, and how they are analytically continued to the kinematic
regions of interest.\n Some examples will be given\, such as the master i
ntegrals for the NNLO QED corrections to mu-e scattering\, which are cruci
al for the physics program of MUonE\, an experiment proposed with the goal
of determining the leading hadronic contribution to the muon g-2 in a nov
el way.\n\nSpeaker:\n* Dr Stefano Di Vita (INFN Milano)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79819-differential-equations-and-i
terated-integrals-for-massive-multi-loop-feynman-integrals
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79639@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20190923T093100
LAST-MODIFIED:20191204T130235
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20191211T140000
DTEND;TZID=Europe/London:20191211T150000
SUMMARY:(Precision) New Physics searches within the LHC dataset
DESCRIPTION:In this talk we will discuss how to perform precision calculat
ions in the SMEFT framework\, in order to parametrise small deviations fro
m the SM predictions. We will discuss how to implement the complex mass sc
heme in an EFT calculation and how to go beyond leading order. \n\nFurthe
r we will discuss how to extract numerical predictions for different elect
roweak processes in order to look for new physics within the LHC run-2 and
upcoming runs.\n\nSpeaker:\n* Raquel Gomez Ambrosio (Durham University)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2019/79639-precision-new-physics-search
es-within-the-lhc-dataset
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79865@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191129T141024
LAST-MODIFIED:20200106T122737
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200108T140000
DTEND;TZID=Europe/London:20200108T150000
SUMMARY:The Dilaton Potential and Lattice Data
DESCRIPTION:Lattice studies of a certain class of confining gauge\ntheorie
s indicate the presence of an anomalously light scalar in the\nspectrum of
composites. Gauge theories in this class are chosen to have a\nlight ferm
ion count lying just below the threshold value for entry into\nthe conform
al window. In this talk\, I will discuss recent work in which\nthis light
scalar is interpreted as a dilaton and a simple EFT description\nfor it is
studied and used to analyse recent lattice results. In this\nwork\, we ad
opt a simple form for the dilaton potential in the EFT\, which\ninterpolat
es among earlier proposals. It describes departures from\nconformal symmet
ry\, by the insertion of a single operator at leading order\nin the EFT. U
sing the lattice measurements\, we extract model parameter\nvalues\, inclu
ding those that characterise the scalar potential. The\nresults suggest th
at the EFT provides a good fit to the data\, and include\nthe possibility
that the conformal deformation is clearly non-marginal.\n\nSpeaker:\n* Jam
es Ingoldby (ICTP - Trieste)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79865-the-dilaton-potential-and-la
ttice-data
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79883@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191211T091624
LAST-MODIFIED:20200108T100438
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200115T140000
DTEND;TZID=Europe/London:20200115T150000
SUMMARY:Gravitational scattering and radiation in the eikonal approach - E
merging Hawking-like radiation in gravitational scattering beyond the Plan
ck scale
DESCRIPTION:We generalize the semiclassical treatment of graviton radiatio
n to\n gravitational scattering at very large energies\n $E >> m_P$ and fi
nite scattering angles $\\Theta_s$\, so as to approach the\n collapse regi
me. Our basic tool is the\n extension of the recently proposed\, unified f
orm of radiation to the\n Amati-Ciafaloni-Veneziano reduced-action model.\
n By resumming eikonal scattering diagrams\, we\n are able to derive the c
orresponding (unitary) coherent-state operator.\n The resulting graviton s
pectrum turns out to be tuned on the gravitational\n radius $R$ for small
angles $\\Theta_s << 1$ but\, for sizeable\n angles $\\Theta_s \\sim 1$ a
cquires an exponential cutoff of the large frequency\n region ($\\omega >
1/R$)\, due to energy conservation\, so as to emit a\n finite fraction of
the total energy. In the approach-to-collapse regime we\n find a radiation
enhancement due to large tidal forces\, so that\n the whole energy is rad
iated off\, with a large multiplicity\n $ \\sim Gs >> 1$ and a well-de
fined frequency cutoff of order $1/R$. The latter\n corresponds to the Haw
king temperature for a black hole of mass\n somewhat smaller than $E$.\n\n
Speaker:\n* Dr Dimitri Colferai (University of Florence)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79883-gravitational-scattering-and
-radiation-in-the-eikonal-approach-emerging-hawking-like-radiation-in
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79801@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191112T215146
LAST-MODIFIED:20200123T102338
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200122T140000
DTEND;TZID=Europe/London:20200122T150000
SUMMARY:A non-perturbative mechanism for fermion mass generation
DESCRIPTION:In this talk I present (numerical) evidence for the existence
of a field-theoretical mechanism that can provide mass to fermions in mode
ls with fermions\, non-abelian gauge fields and scalars\, where chiral sym
metry is broken at the cutoff level by some irrelevant term\, provided the
model parameters are tuned to critical values at which chiral symmetry is
maximally restored. We show that in the Nambu-Goldstone phase of the crit
ical model fermions acquire a non-perturbative mass of the order of the RG
I scale of the theory times powers of the coupling constant of the gauge i
nteraction the fermion is subjected to and independent of the scalar vev.
The peculiar structure of this mass term 1) suggests the existence of a s
uper-strong non-abelian sector at the (multi)TeV scale as\, in order to ha
ve the top mass at its physical value\, the RGI scale of the theory must b
e much larger than $\\Lambda_{QCD}$\, 2) it suggests that the fermion mass
hierarchy is a consequence of the different strength of the interaction t
he particles feel.\n\nSpeaker:\n* Professor Giancarlo Rossi (Universita' d
i Roma "Tor Vergata")
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79801-a-non-perturbative-mechanism
-for-fermion-mass-generation
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79797@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191112T152706
LAST-MODIFIED:20200224T094144
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200129T140000
DTEND;TZID=Europe/London:20200129T150000
SUMMARY:Ghosts\, spheres\, and the double copy
DESCRIPTION:I will present a formulation of gravity as a double copy of ga
uge theories in the context of the Becchi-Rouet-Stora-Tyutin (BRST) formal
ism. I will show how this gives an algorithm for consistently mapping gaug
e choices from YM to gravity. Moreover\, it resolves the issue of the dila
ton degree of freedom arising in the double copy\, thus allowing for the c
onsistent construction of solutions in General Relativity. I will descri
be the perturbative construction at higher orders\, as well as the formula
tion of the BRST double copy in a spherical background.\n\nSpeaker:\n* Dr
Silvia Nagy (University of Nottingham)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79797-ghosts-spheres-and-the-doubl
e-copy
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79897@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191213T155014
LAST-MODIFIED:20200224T093921
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200212T140000
DTEND;TZID=Europe/London:20200212T150000
SUMMARY:The Equal-Mass Banana Integral and Integrals of Modular Forms
DESCRIPTION:Great progress in the analytic computation of scattering ampli
tudes was made in recent years utilising our good understanding of polylog
arithms. With demands for higher precision calculations including massive
states\, we are now often confronted with functional dependences that lie
beyond the realm of polylogarithms. We investigate the relation between di
fferent Riemann surfaces and the connected function spaces\, define a usef
ul basis of functions for the computation of scattering amplitudes and wil
l show how to compute the equal-mass banana integral in terms of these fun
ctions.\n\nSpeaker:\n* Dr Robin Marzucca (IPPP Durham)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79897-the-equal-mass-banana-integr
al-and-integrals-of-modular-forms
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79894@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191212T182029
LAST-MODIFIED:20200213T131632
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200219T140000
DTEND;TZID=Europe/London:20200219T150000
SUMMARY:What if Planet 9 is a Primordial Black Hole?
DESCRIPTION:We highlight that the anomalous orbits of Trans-Neptunian Obje
cts (TNOs) and an excess in microlensing events in the 5-year OGLE dataset
can be simultaneously explained by a new population of astrophysical bodi
es with mass several times that of Earth (M⊕). We take these objects to
be primordial black holes (PBHs) and point out the orbits of TNOs would be
altered if one of these PBHs was captured by the Solar System\, inline wi
th the Planet 9 hypothesis. Capture of a free floating planet is a leading
explanation for the origin of Planet 9 and we show that the probability o
f capturing a PBH instead is comparable. The observational constraints on
a PBH in the outer Solar System significantly differ from the case of a ne
w ninth planet. This scenario could be confirmed through annihilation sign
als from the dark matter microhalo around the PBH.\n\nSpeaker:\n* Dr Jakub
Scholtz (IPPP Durham)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79894-what-if-planet-9-is-a-primor
dial-black-hole
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79764@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191105T125020
LAST-MODIFIED:20200309T111125
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200311T140000
DTEND;TZID=Europe/London:20200311T150000
SUMMARY:Applications of Nonrelativistic Theories: Gravitational Waves and
Higgs Boson Production
DESCRIPTION:The study of non-relativistic bound systems has a long history
in\nphysics and is still highly relevant today. I outline how modern\neff
ective field theory methods enable us to systematically improve their\ndes
cription. As examples\, I discuss compact binary systems as sources of\ngr
avitational waves and the production of Higgs bosons and Higgs boson\npair
s in gluon fusion at the LHC.\n\n\nSpeaker:\n* Andreas Martin Maier (DESY
- Zeuthen)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79764-applications-of-nonrelativis
tic-theories-gravitational-waves-and-higgs-boson-production
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79762@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191105T124639
LAST-MODIFIED:20200316T090553
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200318T140000
DTEND;TZID=Europe/London:20200318T150000
SUMMARY:[CANCELLED] Astrid Eichhorn
DESCRIPTION:tba\n\nSpeaker:\n* Astrid Eichhorn (CP3-Origins)
LOCATION:Room 6206\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79762-astrid-eichhorn
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79794@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191111T114715
LAST-MODIFIED:20200316T090659
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200325T140000
DTEND;TZID=Europe/London:20200325T150000
SUMMARY:[CANCELLED] Maxim Polyakov
DESCRIPTION:tba\n\nSpeaker:\n* Prof. Maxim Polyakov (Ruhr-Universität Boc
hum)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79794-maxim-polyakov
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80046@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200305T165713
LAST-MODIFIED:20200318T160713
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200401T140000
DTEND;TZID=Europe/London:20200401T150000
SUMMARY:[CANCELLED] Maeve Madigan
DESCRIPTION:tba\n\nSpeaker:\n* Maeve Madigan (University of Cambridge)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/80046-maeve-madigan
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79998@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200224T092450
LAST-MODIFIED:20200311T154755
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200408T140000
DTEND;TZID=Europe/London:20200408T150000
SUMMARY:[CANCELLED] Rainer Sommer
DESCRIPTION:tba\n\nSpeaker:\n* Prof Rainer Sommer (DESY)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79998-rainer-sommer
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79851@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191125T135849
LAST-MODIFIED:20200404T155612
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200415T140000
DTEND;TZID=Europe/London:20200415T150000
SUMMARY:[CANCELLED] David Berman
DESCRIPTION:tba\n\nSpeaker:\n* David Berman (Queen Mary University of Lond
on)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79851-david-berman
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79816@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191119T092356
LAST-MODIFIED:20200416T160613
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200422T140000
DTEND;TZID=Europe/London:20200422T150000
SUMMARY:[CANCELLED] Antoine Gerardin
DESCRIPTION:tba\n\nSpeaker:\n* Dr Antoine Gerardidn (University of Marseil
le)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79816-antoine-gerardin
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79911@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200106T113932
LAST-MODIFIED:20200429T130932
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200429T140000
DTEND;TZID=Europe/London:20200429T150000
SUMMARY:Local anomalies in Z’ models
DESCRIPTION:In this talk I will follow the work presented in arXiv:1912.10
022 in which we consider local (or perturbative) gauge anomalies in models
featuring an extra Z′ boson compared to the Standard Model (SM)\, alo
ng with n SM-singlet fermions. Assuming that the gauge group is compact\
, we give a general solution to the anomaly cancellation conditions (ACCs)
for the ACCs that involve only SM fermions and we examine whether a corre
sponding solution exists for the remaining ACCs. We argue that this should
be adequate for the purposes of phenomenology\, at least for the time bei
ng. We show that a solution to the remaining ACCs always exists for n≥5
in the family non-universal case or n≥3 in the family-universal case
. In the special case where only a single family carries non-vanishing cha
rges\, we find a general solution to all ACCs\, for any value of n.\n\nSp
eaker:\n* Joseph Tooby-Smith (University of Cambridge)
LOCATION:https://eu.bbcollab.com/guest/2a2214c8a7a34711ae4d829c5b1a875d
URL:https://www.ph.ed.ac.uk/events/2020/79911-local-anomalies-in-z-models
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79989@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200214T140025
LAST-MODIFIED:20200430T152049
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200506T140000
DTEND;TZID=Europe/London:20200506T150000
SUMMARY:Power-enhanced QED corrections in flavour physics
DESCRIPTION:QED effects in flavour physics are ubiquitous but still not we
ll-understood due to the intrinsically non-perturbative nature of QCD boun
d states. \nI will discuss how modern methods based on soft-collinear effe
ctive field theory can be applied to understand QED corrections in QCD bou
nd states. \nUsing the example of the leptonic decay of the strange B-meso
n\, I will show how non-local QED effects can lead to power-enhanced corre
ctions \nin the heavy quark expansion and how the QED corrections can be s
ystematically resummed.\n\nSpeaker:\n* Robert Szafron (CERN)
LOCATION:https://eu.bbcollab.com/guest/ef4ef27377da4f9f84f740b49c28509e
URL:https://www.ph.ed.ac.uk/events/2020/79989-power-enhanced-qed-correctio
ns-in-flavour-physics
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79892@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191211T230559
LAST-MODIFIED:20200516T102445
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200520T140000
DTEND;TZID=Europe/London:20200520T150000
SUMMARY:[CANCELLED] Oscar Cata
DESCRIPTION:tba\n\nSpeaker:\n* Prof Oscar Cata (University of Siegen)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79892-oscar-cata
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80000@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200224T122523
LAST-MODIFIED:20200520T152733
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200527T140000
DTEND;TZID=Europe/London:20200527T150000
SUMMARY:Looking at QED through the glasses of Very Special Relativity
DESCRIPTION:The proposal of Cohen and Glashow (Phys.Rev.Lett. 97 (2006)
021601)\, that the universe could be invariant under a subgroup of the L
orentz group instead of the full group\, offers a solution for the neutrin
o mass without introducing new particles. In this talk we will review the
main features of the model and how the non-local operators present in VSR
theories modify QED in 1+1\, 2+1 and 3+1 dimensions.\n\nSpeaker:\n* Alex S
oto Villaroel (Pontificia Universidad Católica de Chile)
LOCATION:https://eu.bbcollab.com/guest/6f53ef837eb845e8ae24750c4cad0c93
URL:https://www.ph.ed.ac.uk/events/2020/80000-looking-at-qed-through-the-g
lasses-of-very-special-relativity
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79970@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200205T091121
LAST-MODIFIED:20200519T144315
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200603T140000
DTEND;TZID=Europe/London:20200603T150000
SUMMARY:[CANCELLED] Bernat Capdevila Soler
DESCRIPTION:tba\n\nSpeaker:\n* Bernat Capdevila Soler (Università degli S
tudi di Torino)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79970-bernat-capdevila-soler
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79814@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20191118T094938
LAST-MODIFIED:20200622T173413
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200611T140000
DTEND;TZID=Europe/London:20200611T150000
SUMMARY:Georgios Papathanasiou (DESY): All-order amplitudes at any multipl
icity in the multi-Regge limit
DESCRIPTION:Maximally supersymmetric Yang-Mills theory serves as a unique
theoretical laboratory connecting beautiful mathematics to realistic appli
cations. In this talk I present a complete perturbative solution for the p
lanar scattering amplitudes of the theory at any loop order and multiplici
ty\, in certain region of the conceptually important multi-Regge limit. I
describe how the expected integrability of the theory\, and analytic struc
ture of amplitudes in the limit\, are key for arriving at this solution. F
inally\, I sketch a proof of the maximal transcendentality principle as an
application.\n\nSpeaker:\n* Dr Georgios Papathanasiou (DESY\, Hamburg)
LOCATION:https://eu.bbcollab.com/guest/f5996c7d1d4942dc89d16ea593534e62
URL:https://www.ph.ed.ac.uk/events/2020/79814-georgios-papathanasiou-desy-
all-order-amplitudes-at-any-multiplicity-in-the-multi-regge-limit
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79975@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200206T092750
LAST-MODIFIED:20200520T161122
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200617T140000
DTEND;TZID=Europe/London:20200617T150000
SUMMARY:[CANCELLED] Alessandro Pilloni
DESCRIPTION:tba\n\nSpeaker:\n* Alessandro Pilloni (ECT* Trento)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/79975-alessandro-pilloni
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80056@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200312T092240
LAST-MODIFIED:20200619T150814
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200624T140000
DTEND;TZID=Europe/London:20200624T150000
SUMMARY:[CANCELLED] Kai Yan
DESCRIPTION:tba\n\nSpeaker:\n* Dr Kai Yan (MPI Munich)
LOCATION:Higgs Centre Seminar Room\, Room 4305\, JCMB
URL:https://www.ph.ed.ac.uk/events/2020/80056-kai-yan
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79924@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200113T143637
LAST-MODIFIED:20200520T154955
STATUS:CANCELLED
DTSTART;TZID=Europe/London:20200629T140000
DTEND;TZID=Europe/London:20200629T150000
SUMMARY:[CANCELLED] Making sense of the Nambu-Jona-Lasinio model via scale
invariance
DESCRIPTION:The status of the chiral-invariant Nambu-Jona-Lasinio (NJL) fo
ur-fermi model is quite equivocal. It serves as the paradigm for dynamical
symmetry breaking and yet it is not renormalizable. NJL only studied one
loop graphs with point vertices\, and needed to use an ultraviolet cutoff.
We propose to dress the point vertices with scale invariant vertices with
anomalous dimensions. We show that if the dimension of the $\\bar{\\psi}\
\psi$ fermion mass operator is reduced from a canonical three to a dynamic
al two\, the four fermion interaction becomes renormalizable to all orders
in the four-fermion coupling constant. Additionally\, we find that dynami
cal symmetry breaking then occurs with the fermion becoming massive\, and
we obtain a dynamical massless pseudoscalar Goldstone boson and a dynamica
l scalar Higgs boson. The Higgs boson mass is automatically of order the d
ynamical fermion mass\, with there thus being no hierarchy problem. The Hi
ggs boson automatically has a width\, and the width could serve as a diagn
ostic to distinguish a dynamical Higgs from an elementary one. We extend t
he scale invariance to local conformal invariance as then coupled to a gra
vity theory\, conformal gravity\, that is conformal too. With Bender and M
annheim having shown that conformal gravity is a ghost-free\, unitary theo
ry\, it can serve as a consistent theory of quantum gravity. We show that
all of the achievements of supersymmetry can be achieved by conformal symm
etry and conformal gravity instead\, with there then being no need for any
new particles at the LHC.\n\nSpeaker:\n* Prof Philip Mannheim (University
of Connecticut)
LOCATION:4325A\, James Clerk Maxwell Building\, King's Buildings
URL:https://www.ph.ed.ac.uk/events/2020/79924-making-sense-of-the-nambu-jo
na-lasinio-model-via-scale-invariance
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-79954@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200128T155201
LAST-MODIFIED:20200708T154521
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200708T140000
DTEND;TZID=Europe/London:20200708T150000
SUMMARY:Differential equations for one-loop string integrals
DESCRIPTION:This talk is dedicated to mathematical structures in the low-e
nergy expansion of \none-loop string amplitudes. I will review basics of s
tring perturbation theory and \ngive examples of connections with number t
heory from the integration over moduli \nof punctured worldsheet. At one l
oop\, the insertion of external states on the open- \nand closed-string wo
rldsheets requires integration over punctures on a cylinder \nboundary and
a torus\, respectively. Suitable bases of such integrals will be shown \n
to obey simple first-order differential equations in the modular parameter
of the \nsurface. These differential equations will be exploited to perfo
rm the integrals \norder by order in the inverse string tension\, similar
to modern strategies for \ndimensionally regulated Feynman integrals. Our
method manifests the appearance \nof iterated integrals over holomorphic E
isenstein series in the low-energy expansion. \nMoreover\, infinite famili
es of Laplace equations can be generated for the modular \nforms in closed
-string low-energy expansions.\n\nSpeaker:\n* Prof Oliver Schlotterer (Uni
versity of Uppsala)
LOCATION:https://eu.bbcollab.com/guest/9c7618378d804924a3a3ecd1521672a3
URL:https://www.ph.ed.ac.uk/events/2020/79954-differential-equations-for-o
ne-loop-string-integrals
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80723@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200729T163335
LAST-MODIFIED:20200914T100227
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200902T140000
DTEND;TZID=Europe/London:20200902T150000
SUMMARY:Positivity Bounds: Building UV/IR Connections Using Scattering Amp
litudes
DESCRIPTION:The Effective Field Theory (EFT) framework has proven immensel
y successful in both particle physics and cosmology\, providing a means of
describing low-energy observations in the IR without reference to the (as
yet unknown) high-energy physics in the UV.\n But this decoupling of the
UV from the IR also presents a major obstacle to uncovering new fundamenta
l physics beyond the Standard Model and LambdaCDM - since it is not possib
le to probe the relevant energy scales directly\, it is difficult to go be
yond our low-energy effective descriptions.\n In this talk\, I will presen
t new developments in overcoming this obstacle.\n Certain fundamental prop
erties in the UV (such as causality\, locality and unitarity) leave charac
teristic imprints on the EFT scattering amplitude in the IR. These imprint
s\, known as “positivity bounds”\, can be used to bridge the gap betwe
en the UV and IR regimes.\n I will show how features of the UV can be infe
rred from our low-energy measurements\, and conversely how UV axioms can b
e used as priors to improve our IR parameter estimation of EFT coefficient
s.\n These “positivity” connections between the UV and IR regimes prov
ide us with a new way of analysing low-energy EFTs that will guide us towa
rds a better understanding of the new physics which lies beyond our curren
t models.\n\nSpeaker:\n* Dr Scott Melville (University of Cambridge)
LOCATION:https://ed-ac-uk.zoom.us/j/93887094261
URL:https://www.ph.ed.ac.uk/events/2020/80723-positivity-bounds-building-u
vir-connections-using-scattering-amplitudes
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80850@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200902T095502
LAST-MODIFIED:20200917T093337
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20200916T140000
DTEND;TZID=Europe/London:20200916T150000
SUMMARY:Massive Conformal Symmetry and Integrability for Feynman Integrals
DESCRIPTION:Since the rise of the AdS/CFT duality\, integrability has prov
en to be an important \ntool to advance our understanding of massless QFT.
\nIn this talk we demonstrate that integrability is also present in massi
ve QFT in D>2 \nspacetime dimensions. After reviewing the connection betwe
en AdS/CFT integrability \nand massless Feynman graphs\, we show that larg
e classes of massive Feynman integrals \nare highly constrained by an infi
nite dimensional Yangian extension of dual conformal \nsymmetry. When tran
slated to momentum space\, this leads to a novel massive generalization \n
of ordinary conformal symmetry. Finally\, we introduce a massive version o
f the so-called \nfishnet theory and argue that these features of massive
Feynman integrals can be understood \nas the integrability of planar scatt
ering amplitudes in this theory.\n\n\nSpeaker:\n* Florian Loebbert (Humbol
dt University Berlin)
LOCATION:https://ed-ac-uk.zoom.us/j/93564654489
URL:https://www.ph.ed.ac.uk/events/2020/80850-massive-conformal-symmetry-a
nd-integrability-for-feynman-integrals
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80852@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200902T095717
LAST-MODIFIED:20200902T095717
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20201021T140000
DTEND;TZID=Europe/London:20201021T150000
SUMMARY:Chris Kavanagh
DESCRIPTION:tba\n\nSpeaker:\n* Chris Kavanagh (Max Planck Institute Potsda
m)
LOCATION:Online - details to follow
URL:https://www.ph.ed.ac.uk/events/2020/80852-chris-kavanagh
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80899@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200909T224851
LAST-MODIFIED:20200909T224851
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20201111T140000
DTEND;TZID=Europe/London:20201111T150000
SUMMARY:Christine Davies
DESCRIPTION:tba\n\nSpeaker:\n* Prof Christine Davies (University of Glasgo
w)
LOCATION:Online - details to follow
URL:https://www.ph.ed.ac.uk/events/2020/80899-christine-davies
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:EVENT-80919@www.ph.ed.ac.uk
DTSTAMP:20200924T183200
CREATED:20200918T214023
LAST-MODIFIED:20200918T214023
STATUS:CONFIRMED
DTSTART;TZID=Europe/London:20201202T170000
DTEND;TZID=Europe/London:20201202T180000
SUMMARY:Clifford Cheung
DESCRIPTION:tba\n\nSpeaker:\n* Prof Clifford Cheung (Caltech)
LOCATION:Online - details to follow
URL:https://www.ph.ed.ac.uk/events/2020/80919-clifford-cheung
END:VEVENT
END:VCALENDAR