Consistency tests for the extraction of the Boer-Mulders and Sivers functions

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Title: Consistency tests for the extraction of the Boer-Mulders and Sivers functions
Authors: Christova, E
Leader, E
Stoilov, M
Item Type: Journal Article
Abstract: At present, the Boer-Mulders (BM) function for a given quark flavor is extracted from data on semi-inclusive deep inelastic scattering (SIDIS) using the simplifying assumption that it is proportional to the Sivers function for that flavor. In a recent paper, we suggested that the consistency of this assumption could be tested using information on so-called difference asymmetries i.e. the difference between the asymmetries in the production of particles and their antiparticles. In this paper, using the SIDIS COMPASS deuteron data on the ⟨ cos ϕ h ⟩ , ⟨ cos 2 ϕ h ⟩ and Sivers difference asymmetries, we carry out two independent consistency tests of the assumption of proportionality, but here applied to the sum of the valence-quark contributions. We find that such an assumption is compatible with the data. We also show that the proportionality assumptions made in the existing parametrizations of the BM functions are not compatible with our analysis, which suggests that the published results for the Boer-Mulders functions for individual flavors are unreliable. The ⟨ cos ϕ h ⟩ and ⟨ cos 2 ϕ h ⟩ asymmetries receive contributions also from the, in principle, calculable Cahn effect. We succeed in extracting the Cahn contributions from experiment (we believe for the first time) and compare with their calculated values, with interesting implications.
Issue Date: 27-Mar-2018
Date of Acceptance: 1-Jun-2017
ISSN: 1550-2368
Publisher: American Physical Society
Journal / Book Title: Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume: 97
Issue: 5
Copyright Statement: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Sponsor/Funder: The Royal Society
Funder's Grant Number: 2005/R3
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Publication Status: Published
Article Number: ARTN 056018
Online Publication Date: 2018-03-27
Appears in Collections:Physics
High Energy Physics
Faculty of Natural Sciences

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