Chi_2 production in polarized pp collisions at RHIC: measuring ΔG and testing the color octet model

Details Chi_2 production in polarized pp collisions at RHIC: measuring ΔG and testing the color octet model Chi_2 production in polarized pp collisions at RHIC: measuring ΔG and testing the color octet model

1999-03-08

arxiv.org/abs/hep-ph/9903280v1

Phys.Lett.B455:306-310,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages

Scientific paper

10.1016/S0370-2693(99)00448-7

We consider the production and decay of the $\chi_2$ charmonium state in polarized and unpolarized $pp$ collisions at RHIC in the framework of an effective theory based on the QCD multipole expansion. We find that the angular distribution in the decay of the produced charmonium, $\chi_2 \to J/\psi + \gamma$, in the unpolarized case allows us to distinguish clearly between the color singlet and color octet production mechanisms. Once the production mechanism is known, the angular distribution in the polarized case can be used to measure the polarized gluon distribution in the proton, $\Delta G(x)$.

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