Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC

Matevosyan, Hrayr H.; Kotzinian, Aram; Aschenauer, Elke -Caroline; Avakian, Harut A.; Thomas, Anthony W.

doi:10.1103/PhysRevD.92.054028

Title: Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC

Journal Article · Wed Sep 23 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.92.054028· OSTI ID:1221544

Matevosyan, Hrayr H. ^[1]; Kotzinian, Aram ^[2]; Aschenauer, Elke -Caroline ^[3]; Avakian, Harut A. ^[4]; Thomas, Anthony W. ^[1]

Univ. of Adelaide, Adelaide (Australia)
Yerevan Physics Inst. (YerPhI), Yerevan (Armenia); Sezione di Torino, Torino (Italy)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The study of the Sivers effect, describing correlations between the transverse polarization of the nucleon and its constituent (unpolarized) parton’s transverse momentum, has been the topic of a great deal of experimental, phenomenological and theoretical effort in recent years. Semi-inclusive deep inelastic scattering measurements of the corresponding single spin asymmetries (SSA) at the upcoming CLAS12 experiment at JLab and the proposed Electron-Ion Collider will help to pinpoint the flavor structure and the momentum dependence of the Sivers parton distribution function describing this effect. Here we describe a modified version of the pythia6 Monte Carlo event generator that includes the Sivers effect. Then we use it to estimate the size of these SSAs, in the kinematics of these experiments, for both one and two hadron final states of pions and kaons. For this purpose we utilize the existing Sivers parton distribution function (PDF) parametrization extracted from HERMES and COMPASS experiments. As a result, using this modified version of pythia6, we also show that the leading order approximation commonly used in such extractions may provide significantly underestimated values of Sivers PDFs, as in our Monte Carlo simulations the omitted parton showers and non-DIS processes play an important role in these SSAs, for example in the COMPASS kinematics.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FL0992247 (AWT); CE110001004 (CoEPP); SC0012704; AC05-06OR23177; SC00112704

OSTI ID:: 1221544

Alternate ID(s):: OSTI ID: 1227323; OSTI ID: 1234363

Report Number(s):: JLAB-PHY-15-2026; DOE/OR/23177-3330; arXiv:1502.02669; BNL-108601-2015-JA; PRVDAQ

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 92, Issue 5; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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