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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

Abstract

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.

Authors:
;  [1];  [2]
  1. Univ. del Piemonte Orientale "A. Avogadro", and INFN, Gruppo Collegato di Alessandria, Alessandria (Italy)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
982198
Report Number(s):
JLAB-THY-09-1121; DOE/OR/23177-1071
Journal ID: ISSN 1550-7998; PRVDAQ; TRN: US201013%%358
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 81; Journal Issue: 11; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; DEEP INELASTIC SCATTERING; DISTRIBUTION; DISTRIBUTION FUNCTIONS; TRANSVERSE MOMENTUM

Citation Formats

Vincenzo Barone, Melis, Stefano, and Prokudin, Alexei. Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $\cos 2 \phi$ asymmetry. United States: N. p., 2010. Web. doi:10.1103/PhysRevD.81.114026.
Vincenzo Barone, Melis, Stefano, & Prokudin, Alexei. Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $\cos 2 \phi$ asymmetry. United States. doi:10.1103/PhysRevD.81.114026.
Vincenzo Barone, Melis, Stefano, and Prokudin, Alexei. Thu . "Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $\cos 2 \phi$ asymmetry". United States. doi:10.1103/PhysRevD.81.114026. https://www.osti.gov/servlets/purl/982198.
@article{osti_982198,
title = {Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $\cos 2 \phi$ asymmetry},
author = {Vincenzo Barone and Melis, Stefano and Prokudin, Alexei},
abstractNote = {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.},
doi = {10.1103/PhysRevD.81.114026},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 11,
volume = 81,
place = {United States},
year = {2010},
month = {6}
}

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