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

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arxiv 0905.1258 v2 pith:IPTBVMA6 submitted 2009-05-08 hep-ph hep-exnucl-exnucl-th

classification hep-phhep-exnucl-exnucl-th
keywords amplitudedistributionleptonphotonphotoproductiontransversityaccessamplitudes
verification ladder T0 review T1 audit T2 compute T3 formal
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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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  1. Nucleon tensor form factors at large $N_{c}$

    hep-ph 2025-01 conditional novelty 6.0 of 10

    In the pion mean-field picture at large Nc, the nucleon tensor charge and anomalous tensor magnetic moment are valence dominated, while the tensor quadrupole moment is sea dominated and strongly enhanced near the chir...

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