Transverse Lambda polarization at high energy colliders

Details Transverse Lambda polarization at high energy colliders Transverse Lambda polarization at high energy colliders

2010-07-19

arxiv.org/abs/1007.3145v1

PoS DIS2010:215,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 eps figures, uses PoS.cls, talk presented at the XVIII International Workshop on Deep-Inelastic Scattering and Rela

Scientific paper

Measurements of transverse polarization of Lambda hyperons produced in high energy pp collisions may help to address several open issues about Lambda production and polarization mechanisms, such as the amount of SU(3) breaking, the importance of gluons and sea quarks, and the origin of spontaneous Lambda polarization. The process p + p -> Lambda^\uparrow + jet + X at midrapidity is ideally suited for this purpose, for instance at LHC's ALICE experiment. New expressions and predictions are presented for the transverse Lambda polarization in this process, within a factorized description which involves transverse momentum and spin dependence in the fragmentation process. Uncertainties from the unpolarized Lambda fragmentation functions, due to the unknown magnitude of SU(3) breaking and the apparent inconsistency between pp and e^+ e^- data, are investigated.

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