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

Abstract

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, formore » example in the COMPASS kinematics.« less

Authors:
 [1];  [2];  [3];  [4];  [1]
+ Show Author Affiliations
  1. Univ. of Adelaide, Adelaide (Australia)
  2. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia); Sezione di Torino, Torino (Italy)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. 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); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1221544
Alternate Identifier(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
Journal ID: ISSN 1550-7998; PRVDAQ
Grant/Contract Number:  
FL0992247 (AWT); CE110001004 (CoEPP); SC0012704; AC05-06OR23177; SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 92; Journal Issue: 5; 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; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Relativistic Heavy Ion Collider

Citation Formats

Matevosyan, Hrayr H., Kotzinian, Aram, Aschenauer, Elke -Caroline, Avakian, Harut A., and Thomas, Anthony W. Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC. United States: N. p., 2015. Web. doi:10.1103/PhysRevD.92.054028.
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Matevosyan, Hrayr H., Kotzinian, Aram, Aschenauer, Elke -Caroline, Avakian, Harut A., & Thomas, Anthony W. Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC. United States. https://doi.org/10.1103/PhysRevD.92.054028
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Matevosyan, Hrayr H., Kotzinian, Aram, Aschenauer, Elke -Caroline, Avakian, Harut A., and Thomas, Anthony W. Wed . "Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC". United States. https://doi.org/10.1103/PhysRevD.92.054028. https://www.osti.gov/servlets/purl/1221544.
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@article{osti_1221544,
title = {Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC},
author = {Matevosyan, Hrayr H. and Kotzinian, Aram and Aschenauer, Elke -Caroline and Avakian, Harut A. and Thomas, Anthony W.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.92.054028},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 5,
volume = 92,
place = {United States},
year = {Wed Sep 23 00:00:00 EDT 2015},
month = {Wed Sep 23 00:00:00 EDT 2015}
}
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https://doi.org/10.1103/PhysRevD.92.054028
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Works referenced in this record:

Single-spin production asymmetries from the hard scattering of pointlike constituents
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Role of Cahn and Sivers effects in deep inelastic scattering
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Observation of the Naive- T -Odd Sivers Effect in Deep-Inelastic Scattering
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Single-Spin Asymmetries in Semi-Inclusive Deep-Inelastic Scattering on a Transversely Polarized Hydrogen Target
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Strategy towards the extraction of the Sivers function with transverse momentum dependent evolution
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QCD evolution of the Sivers asymmetry
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Analyzing Unfavored Fragmentation Functions Using NJL-Jet Model
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  • Matevosyan, Hrayr H.; Thomas, Anthony W.; Bentz, Wolfgang
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Calculating kaon fragmentation functions from the Nambu–Jona-Lasinio jet model
journal, April 2011

Sivers Effect in Two-Hadron Electroproduction
journal, August 2014

Sivers effect in dihadron semi-inclusive deep inelastic scattering
journal, October 2014

Sivers Effect in Dihadron Electroproduction
journal, January 2015

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journal, February 2007

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journal, July 2000

Evidence for a transverse single-spin asymmetry in leptoproduction of π + π − pairs
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conference, January 2005

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First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-inclusive Deep Inelastic Scattering
journal, May 2005

Extracting the Sivers function from polarized semi-inclusive deep inelastic scattering data and making predictions
journal, November 2005

PYTHIA 6.4 physics and manual
journal, May 2006

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    Cos ϕ R asymmetry of dihadron production in double longitudinally polarized SIDIS
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