Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p+p collisions at s =510 GeV

(PHENIX Collaboration)

doi:10.1103/PhysRevD.102.032001

Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p+p collisions at s =510 GeV

(PHENIX Collaboration)

Florida State University
University of Colorado Boulder
University of Massachusetts
Seoul National University
Pusan National University
RIKEN
The University of Tokyo
Hiroshima University
Czech Academy of Sciences
Stony Brook University
Russian Research Centre Kurchatov Institute
Ohio University
United States Department of Energy
Howard University
Brookhaven National Laboratory
University of Maryland, College Park
University of California at Riverside
City University of New York
New Mexico State University
Rikkyo University
University of New Mexico
Lawrence Livermore National Laboratory
Columbia University
Institute for High Energy Physics
Japan Atomic Energy Agency
Institute of Science Tokyo
Vanderbilt University
University of Debrecen

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18 Scopus citations

Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, ALL, for charged pions at midrapidity (|η|<0.35) in longitudinally polarized p+p collisions at s=510 GeV. These measurements are sensitive to the gluon spin contribution to the total spin of the proton in the parton momentum fraction x range between 0.04 and 0.09. One can infer the sign of the gluon polarization from the ordering of pion asymmetries with charge alone. The asymmetries are found to be consistent with global quantum-chromodynamics fits of deep-inelastic scattering and data at s=200 GeV, which show a nonzero positive contribution of gluon spin to the proton spin.

Original language	English
Article number	032001
Journal	Physical Review D
Volume	102
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.102.032001
State	Published - Aug 1 2020

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10.1103/PhysRevD.102.032001

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@article{e41d0ba019794a75b0aaeb860a9343db,

title = "Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p+p collisions at s =510 GeV",

abstract = "The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, ALL, for charged pions at midrapidity (|η|<0.35) in longitudinally polarized p+p collisions at s=510 GeV. These measurements are sensitive to the gluon spin contribution to the total spin of the proton in the parton momentum fraction x range between 0.04 and 0.09. One can infer the sign of the gluon polarization from the ordering of pion asymmetries with charge alone. The asymmetries are found to be consistent with global quantum-chromodynamics fits of deep-inelastic scattering and data at s=200 GeV, which show a nonzero positive contribution of gluon spin to the proton spin.",

author = "\{(PHENIX Collaboration)\} and U. Acharya and A. Adare and C. Aidala and Ajitanand, \{N. N.\} and Y. Akiba and R. Akimoto and M. Alfred and N. Apadula and Y. Aramaki and H. Asano and Atomssa, \{E. T.\} and Awes, \{T. C.\} and B. Azmoun and V. Babintsev and M. Bai and Bandara, \{N. S.\} and B. Bannier and Barish, \{K. N.\} and S. Bathe and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and D. Black and Bok, \{J. S.\} and K. Boyle and Brooks, \{M. L.\} and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Campbell and \{Canoa Roman\}, V. and Chen, \{C. H.\} and Chi, \{C. Y.\} and M. Chiu and Choi, \{I. J.\} and Choi, \{J. B.\} and T. Chujo and Z. Citron and M. Connors and M. Csan{\'a}d and K. Dehmelt and A. Deshpande and A. Drees and R. Esha and Hemmick, \{T. K.\} and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}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.",

year = "2020",

month = aug,

day = "1",

doi = "10.1103/PhysRevD.102.032001",

language = "English",

volume = "102",

journal = "Physical Review D",

issn = "2470-0010",

number = "3",

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TY - JOUR

T1 - Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p+p collisions at s =510 GeV

AU - (PHENIX Collaboration)

AU - Acharya, U.

AU - Adare, A.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Alfred, M.

AU - Apadula, N.

AU - Aramaki, Y.

AU - Asano, H.

AU - Atomssa, E. T.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bandara, N. S.

AU - Bannier, B.

AU - Barish, K. N.

AU - Bathe, S.

AU - Bazilevsky, A.

AU - Beaumier, M.

AU - Beckman, S.

AU - Belmont, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Black, D.

AU - Bok, J. S.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Bryslawskyj, J.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Campbell, S.

AU - Canoa Roman, V.

AU - Chen, C. H.

AU - Chi, C. Y.

AU - Chiu, M.

AU - Choi, I. J.

AU - Choi, J. B.

AU - Chujo, T.

AU - Citron, Z.

AU - Connors, M.

AU - Csanád, M.

AU - Dehmelt, K.

AU - Deshpande, A.

AU - Drees, A.

AU - Esha, R.

AU - Hemmick, T. K.

AU - Jia, J.

AU - Lacey, R.

N1 - Publisher Copyright: © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"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.

PY - 2020/8/1

Y1 - 2020/8/1

N2 - The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, ALL, for charged pions at midrapidity (|η|<0.35) in longitudinally polarized p+p collisions at s=510 GeV. These measurements are sensitive to the gluon spin contribution to the total spin of the proton in the parton momentum fraction x range between 0.04 and 0.09. One can infer the sign of the gluon polarization from the ordering of pion asymmetries with charge alone. The asymmetries are found to be consistent with global quantum-chromodynamics fits of deep-inelastic scattering and data at s=200 GeV, which show a nonzero positive contribution of gluon spin to the proton spin.

AB - The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, ALL, for charged pions at midrapidity (|η|<0.35) in longitudinally polarized p+p collisions at s=510 GeV. These measurements are sensitive to the gluon spin contribution to the total spin of the proton in the parton momentum fraction x range between 0.04 and 0.09. One can infer the sign of the gluon polarization from the ordering of pion asymmetries with charge alone. The asymmetries are found to be consistent with global quantum-chromodynamics fits of deep-inelastic scattering and data at s=200 GeV, which show a nonzero positive contribution of gluon spin to the proton spin.

UR - https://www.scopus.com/pages/publications/85090273815

U2 - 10.1103/PhysRevD.102.032001

DO - 10.1103/PhysRevD.102.032001

M3 - Article

AN - SCOPUS:85090273815

SN - 2470-0010

VL - 102

JO - Physical Review D

JF - Physical Review D

IS - 3

M1 - 032001

ER -

Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p+p collisions at s =510 GeV

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