We are pleased to announce the seminar @ DF UniTs:
Institut de Physique Nucléaire de Lyon, CNRS/IN2P3 and Université Lyon-1
"Including the quark spin degree of freedom in jet simulations"
Friday, 27 November 2015 - 3:30 pm
Lecture Room A, F Building, Dipartimento di Fisica, via Valerio 2, Trieste
Present Monte-Carlo simulations of events like PYTHIA take quark spin into account at the early stage of parton generation, but not in the hadronization stage. In particular they miss the Collins asymmetry which
serves as a "quark polarimeter". I propose a method of introducing the quark spin degree of freedom in a recursive fragmentation model (more precisely, the "Lund symmetric" string fragmentation model). It takes into account the full quantum information carried by a spin. I will give some predictions concerning the Collins effect and a non-trivial transverse momentum correlation inside a jet.