Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries

M. Anselmino, M. Boglione, U. D'Alesio, F. Murgia, A. Prokudin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Information on the Sivers distribution and the Collins fragmentation functions and their transverse momentum dependence is mainly based on fitting single-spin asymmetry data from semi-inclusive deep inelastic scattering (SIDIS). Independent information on the Sivers distribution and the Collins fragmentation can be obtained from the Drell-Yan and e+e- annihilation processes, respectively. In the SIDIS case, the transverse momentum of the final observed hadron, which is the quantity measured, is generated both by the average transverse momentum in the distribution and by that in the fragmentation functions. As a consequence, these are strongly correlated, and a separate extraction is made difficult. In this paper we investigate, in a simple kinematical Gaussian configuration, this correlation, its role on the transverse single-spin asymmetries in SIDIS, and the consequences for predictions of the Sivers asymmetry in Drell-Yan processes and for the Collins asymmetry in e+e- annihilation. We find that, in some cases, these effects can be relevant and must be carefully taken into account.

Original languageEnglish (US)
Article number094023
JournalPhysical Review D
Volume98
Issue number9
DOIs
StatePublished - Nov 1 2018

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transverse momentum
partons
fragmentation
distribution functions
asymmetry
inelastic scattering
configurations
predictions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "Information on the Sivers distribution and the Collins fragmentation functions and their transverse momentum dependence is mainly based on fitting single-spin asymmetry data from semi-inclusive deep inelastic scattering (SIDIS). Independent information on the Sivers distribution and the Collins fragmentation can be obtained from the Drell-Yan and e+e- annihilation processes, respectively. In the SIDIS case, the transverse momentum of the final observed hadron, which is the quantity measured, is generated both by the average transverse momentum in the distribution and by that in the fragmentation functions. As a consequence, these are strongly correlated, and a separate extraction is made difficult. In this paper we investigate, in a simple kinematical Gaussian configuration, this correlation, its role on the transverse single-spin asymmetries in SIDIS, and the consequences for predictions of the Sivers asymmetry in Drell-Yan processes and for the Collins asymmetry in e+e- annihilation. We find that, in some cases, these effects can be relevant and must be carefully taken into account.",
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Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries. / Anselmino, M.; Boglione, M.; D'Alesio, U.; Murgia, F.; Prokudin, A.

In: Physical Review D, Vol. 98, No. 9, 094023, 01.11.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Role of transverse momentum dependence of unpolarized parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries

AU - Anselmino, M.

AU - Boglione, M.

AU - D'Alesio, U.

AU - Murgia, F.

AU - Prokudin, A.

PY - 2018/11/1

Y1 - 2018/11/1

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AB - Information on the Sivers distribution and the Collins fragmentation functions and their transverse momentum dependence is mainly based on fitting single-spin asymmetry data from semi-inclusive deep inelastic scattering (SIDIS). Independent information on the Sivers distribution and the Collins fragmentation can be obtained from the Drell-Yan and e+e- annihilation processes, respectively. In the SIDIS case, the transverse momentum of the final observed hadron, which is the quantity measured, is generated both by the average transverse momentum in the distribution and by that in the fragmentation functions. As a consequence, these are strongly correlated, and a separate extraction is made difficult. In this paper we investigate, in a simple kinematical Gaussian configuration, this correlation, its role on the transverse single-spin asymmetries in SIDIS, and the consequences for predictions of the Sivers asymmetry in Drell-Yan processes and for the Collins asymmetry in e+e- annihilation. We find that, in some cases, these effects can be relevant and must be carefully taken into account.

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