[Phys-seminars] 2017-11-27 Particles and Fields Seminar

lublinm lublinm at bgu.ac.il
Mon Nov 20 17:46:47 IST 2017

Particles and Fields Seminar

 DATE: 27-11-17

 TIME: 14:00

 PLACE: Physics building (#54) room 207

An introduction to Quantum Chromodynamics beyond the collinear approximation

Mirko Serino, BGU

In the very high energy regime of Quantum Chromodynamics, it is desirable to have a description of scattering processes which goes beyond the customary collinear approximation, including effects due to the finite transverse momentum of the initial state particles. This goes under the name of High Energy Factorization program. Since the colliding partons are required to have a non vanishing transverse momentum, their virtuality is not vanishing, which makes it non trivial to maintain gauge invariance. Pioneering efforts in this field were performed, among others, by Lipatov and collaborators. Recently, their results have been reframed in the modern language of spinor helicity techniques, which made it possible to move to arbitrary leg multiplicity and to supplement these Leading Order calculations with parton showers. In this talk, I review the basic ideas and the steps which have been taken so far in developing this framework. In particular, I will discuss how to compute gaug
 e invariant scattering amplitudes in High Energy Factorization with the spinor helicity formalism, how these amplitudes are being supplemented by parton showers and, finally, how the construction of an evolution equation which consistently generalises the DGLAP, BFKL and CCFM evolution equation is being performed.

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