Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the cos2{phi} asymmetry

Barone, Vincenzo; Melis, Stefano; Prokudin, Alexei

doi:10.1103/PHYSREVD.81.114026

Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the cos2{phi} asymmetry

Journal Article · Tue Jun 01 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.114026· OSTI ID:21407971

Barone, Vincenzo; Melis, Stefano ^[1]; Prokudin, Alexei ^[2]

Di.S.T.A., Universita del Piemonte Orientale 'A. Avogadro', 15121 Alessandria (Italy)
Jefferson Laboratory, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)

We present a phenomenological analysis of the cos2{phi} asymmetry recently measured by the COMPASS and HERMES collaborations in unpolarized semi-inclusive deep inelastic scattering. In the kinematical regimes explored by these experiments the asymmetry arises from transverse-spin and intrinsic transverse-momentum effects. We consider the leading-twist contribution, related to the so-called Boer-Mulders transverse-polarization distribution h{sub 1}{sup perpendicular}(x,k{sub T}{sup 2}), and the twist-4 Cahn contribution, involving unpolarized transverse-momentum distribution functions. We show that a reasonably good fit of the preliminary data sets from COMPASS and HERMES is achieved with a Boer-Mulders function consistent with the main theoretical expectations. Our conclusion is that the COMPASS and HERMES measurements represent the first experimental evidence of the Boer-Mulders effect in SIDIS.

OSTI ID:: 21407971

Journal Information:: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821

Country of Publication:: United States

Language:: English

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