Spin alignment of vector mesons in heavy ion and proton - proton collisions

Details Spin alignment of vector mesons in heavy ion and proton - proton collisions Spin alignment of vector mesons in heavy ion and proton - proton collisions

2009-06-23

arxiv.org/abs/0906.4295v1

Phys.Lett.B682:408-412,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, two figures

Scientific paper

10.1016/j.physletb.2009.11.030

The spin alignment matrix element rho_{00} for the vector mesons K^{*0} and phi(1020) has been measured in RHIC at central rapidities. These measurements are consistent with the absence of polarization with respect to the reaction plane in mid-central Au + Au collisions whereas, when measured with respect to the production plane in the same reactions and in p + p collisions, a non-vanishing and p_perp-dependent rho_{00} is found. We show that this behavior can be understood in a simple model of vector meson production where the spin of their constituent quarks is oriented during hadronization as the result of Thomas precession.

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