Dijet imbalance in hadronic collisions

Details Dijet imbalance in hadronic collisions Dijet imbalance in hadronic collisions

2009-09-25

arxiv.org/abs/0909.4652v3

Phys.Rev.D80:094017,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 2 figures; revised version, published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.094017

The imbalance of dijets produced in hadronic collisions has been used to extract the average transverse momentum of partons inside the hadrons. In this paper we discuss new contributions to the dijet imbalance that could complicate or even hamper this extraction. They are due to polarization of initial state partons inside unpolarized hadrons that can arise in the presence of nonzero parton transverse momentum. Transversely polarized quarks and linearly polarized gluons produce specific azimuthal dependences of the two jets that in principle are not suppressed. Their effects cannot be isolated just by looking at the angular deviation from the back-to-back situation, rather they enter jet broadening observables. In this way they directly affect the extraction of the average transverse momentum of unpolarized partons that is thought to be extracted. We discuss appropriately weighted cross sections to isolate the additional contributions.

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