Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $\cos 2 \phi$ asymmetry

Melis, Stefano; Prokudin, Alexei

doi:10.1103/PhysRevD.81.114026

Title: Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $$\cos 2 \phi$$ asymmetry

Journal Article · Thu Jun 17 00:00:00 EDT 2010 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.81.114026· OSTI ID:982198

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

Univ. del Piemonte Orientale "A. Avogadro", and INFN, Gruppo Collegato di Alessandria, Alessandria (Italy)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

We present a phenomenological analysis of the $$\cos 2 \phi$$ 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 $$h_1^{\perp}(x, k_T^2)$$, and the twist-4 Cahn contribution, involving unpolarized transverse-momentum distribution functions. We show that a reasonably good fit of the data is achieved with a Boer-Mulders function consistent with the main theoretical expectations. Lastly, our conclusion is that the COMPASS and HERMES measurements represent the first experimental evidence of the Boer-Mulders effect in SIDIS.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 982198

Report Number(s):: JLAB-THY-09-1121; DOE/OR/23177-1071; PRVDAQ; TRN: US201013%%358

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 81, Issue 11; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 78 works

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Title: Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $$\cos 2 \phi$$ asymmetry

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