Abstract
The angular distribution in photon-jet production in pp¯→γjetX is studied within a generalized factorization scheme taking into account the transverse momentum of the partons in the initial hadrons. Within this scheme an anomalously large cos2ϕ asymmetry observed in the Drell–Yan process could be attributed to the T-odd, spin and transverse momentum dependent parton distribution function h1⊥q(x,p⊥2). This same function is expected to produce a cos2ϕ asymmetry in the photon-jet production cross section. We give the expression for this particular azimuthal asymmetry, which is estimated to be smaller than the Drell–Yan asymmetry but still of considerable size for Tevatron kinematics. This offers a new possibility to study T-odd effects at the Tevatron.
Highlights
It is well known that the angular distribution of Drell–Yan lepton pairs displays an anomalously large cos 2φ asymmetry
If no factors arise from the other correlators one sees that in single spin asymmetries (SSA) involving only one T-odd function h⊥1 q, this function appears in photon-jet production with the above mentioned factor (N 2 + 1)/(N 2 − 1) but otherwise the normal partonic cross section
We have studied the contribution from asymmetry similar to the the
Summary
It is well known that the angular distribution of Drell–Yan lepton pairs displays an anomalously large cos 2φ asymmetry This was experimentally investigated using π− beams scattering off deuterium and tungsten targets at center of mass energies of order. The NLO pQCD result is an order of magnitude too small and of opposite sign This has prompted much theoretical work [4,8,9,10,11,12,13,14,15,16], offering explanations that go beyond the framework of collinear factorization and/or leading twist perturbative QCD. It would be interesting to see if NLO pQCD expectations hold at those energies Such a study of the angular distribution was done for W -boson production at the Tevatron and a nonzero result compatible with. We end with a summary of the results and the required measurement
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