#### Unitarity methods for loop amplitudes

- Event time: 3:00pm
- Event date: 23rd February 2011
- Speaker: Ruth Britto (Trinity College Dublin)
- Location: Lecture Theatre C, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

As an alternative to traditional reduction of loop integrals from Feynman diagrams, loop amplitudes may be constructed by considering constraints from unitarity cuts. One benefit of this approach is that only on-shell information is involved. I will discuss unitarity cut methods and their generalizations, which access different singularities of the amplitude function. In particular, "single cuts" or exotic double cuts give information about coefficients of tadpole integrals.

#### Event resources

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..