QCD factorization at forward rapidities

0367990 - ÚJF 2013 RIV GB eng J - Journal Article
Čepila, J. - Nemchik, J. - Šumbera, Michal
QCD factorization at forward rapidities.
Journal of Physics: Conference Series. Roč. 312, č. 1 (2011), 012013/1-012013/6. ISSN 1742-6588. E-ISSN 1742-6596
R&D Projects: GA MŠMT LA08015
Institutional research plan: CEZ:AV0Z10480505
Keywords : Physics * QCD
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders

We analyze particle production in several reactions on nuclear targets at forward rapidities and different energies. The forward kinematic region at high energies allows to access the smallest Bjorken x. Nuclear effects are then usually interpreted as a result of the coherence effects associated with shadowing or the Color Glass Condensate. QCD factorization of soft and hard interactions requires the nucleus to be an universal filter for different Fock components of the projectile hadron. We demonstrate, however, that this is not the case in the vicinity of the kinematic limit, x → 1, where sharing of energy between the projectile constituents becomes an issue. The rise of suppression of particle production with x is confirmed by the E772 and E886 data on Drell-Yan and heavy quarkonia. We show that this effect can also be treated alternatively as an effective energy loss proportional to initial energy.
Permanent Link: http://hdl.handle.net/11104/0202475