# Measurement of D mesons production in deep inelastic scattering at HERA

Experimental Particle Physics seminar

#### Measurement of D mesons production in deep inelastic scattering at HERA

• Event time: 2:00pm until 3:00pm
• Event date: 9th March 2007
• Speaker: Robert Walsh (DESY)
• Location: Room 5327,

### Event details

The Hadron Electron Ring Accelerator, HERA, is a unique facility to study the scattering between electrons and protons at very high energies. The two colliding experiments at HERA, ZEUS and H1, have been giving important contributions to the understanding of the subatomic world. In this talk, the analysis of charm production in deep inelastic scattering measured with the ZEUS detector at HERA will be presented. Charm has been tagged by reconstructing $D^{*+}$, $D^0$, $D^+$ and $D_s^+$ charm mesons in the kinematic range$p_T(D^{*+},D^0,D^+) > 3$ GeV, $p_T(D_s^+) > 2$ GeV and $|\eta(D)|< 1.6$ for $1.5 < Q^2 < 1000$ GeV$^2$ and $0.02 < y < 0.7$. The production cross sections were used to extract the charm fragmentation ratios and the fraction of $c$ quarks hadronising into a charm meson. The cross sections were compared to the next-to-leading-order QCD predictions, and extrapolated to the full kinematic region in $p_T(D)$ and $\eta(D)$ in order to determine the open-charm contribution, $F_2^{c\bar c}(x,Q^2)$, to the proton structure function $F_2$.

### About Experimental Particle Physics seminars

The experimental particle physics seminar series invites speakers from all over Europe to discuss the latest developments at the LHC, accelerator and non-accelerator based neutrino physics, hardware R&D and astroparticle physics. .