Probing the nucleon's transversity and the photon's distribution amplitude in lepton pair photoproduction

Details Probing the nucleon's transversity and the photon's distribution amplitude in lepton pair photoproduction Probing the nucleon's transversity and the photon's distribution amplitude in lepton pair photoproduction

2009-05-08

arxiv.org/abs/0905.1258v2

Phys.Rev.Lett.103:072002,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure. Version 2 slightly modified, to be published in Phys. Rev. Letters; a few references added

Scientific paper

10.1103/PhysRevLett.103.072002

We describe a new way to access the chiral odd transversity parton distribution in the proton through the photoproduction of lepton pairs. The basic ingredient is the interference of the usual Bethe Heitler or Drell-Yan amplitudes with the amplitude of a process, where the photon couples to quarks through its chiral-odd distribution amplitude, which is normalized to the magnetic susceptibility of the QCD vacuum. A promising phenomenology of single and double spin observables emerges from the unusual features of this amplitude.

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