Transverse single-spin asymmetry of forward n mesons in p + p collisions at √s = 200 GeV

PHENIX Collaboration Spokesperson

doi:10.1103/6VNQ-5HFX

Transverse single-spin asymmetry of forward n mesons in p + p collisions at √s = 200 GeV

PHENIX Collaboration Spokesperson

University of Debrecen
HUN-RENATOMKI
Georgia State University
Los Alamos National Laboratory
University of Michigan, Ann Arbor
Stony Brook University
Abilene Christian University
RIKEN
Riken BNL Research Center
The University of Tokyo
Iowa State University
Peter the Great St. Petersburg Polytechnic University
High Energy Accelerator Research Organization, Tsukuba
Kyoto University
Oak Ridge National Laboratory
United States Department of Energy
Institute for High Energy Physics
Brookhaven National Laboratory
China National Nuclear Corporation
University of California at Riverside
City University of New York
RAS - Saint Petersburg Nuclear Physics Institute
University of Colorado Boulder
University of North Carolina at Greensboro
Vanderbilt University
Russian Research Centre Kurchatov Institute
Moscow Engineering Physics Institute
New Mexico State University
University of New Mexico
Columbia University
Banaras Hindu University
University of Illinois at Urbana-Champaign
Muhlenberg College

Research output: Contribution to journal › Article › peer-review

Abstract

Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward n-meson transverse single-spin asymmetry (A_N) was measured for p۴ + p collisions at ١/s = 200 GeV as a function of Feynman-x (x_F) for 0.2 < jx_Fj < 0.8 and transverse momentum (p_T) for 1.0 < p_T < 5.0 GeV=c. Large asymmetries at positive x_F are observed (hA_Ni = 0.086 ± 0.019), agreeing well with previous measurements of n⁰ and n A_N, but with reach to higher x_F and p_T. The contribution of initial-state spin-momentum correlations to the asymmetry, as calculated in the collinear twist-3 framework, appears insufficient to describe the data.

Original language	English
Article number	072006
Journal	Physical Review D
Volume	113
Issue number	7
DOIs	https://doi.org/10.1103/6VNQ-5HFX
State	Published - Jan 2026
Externally published	Yes

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10.1103/6VNQ-5HFX

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@article{d5c3df67b14b4ccb9ea9300c4aa62ebe,

title = "Transverse single-spin asymmetry of forward n mesons in p + p collisions at √s = 200 GeV",

abstract = "Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward n-meson transverse single-spin asymmetry (AN) was measured for p۴ + p collisions at ١/s = 200 GeV as a function of Feynman-x (xF) for 0.2 < jxFj < 0.8 and transverse momentum (pT) for 1.0 < pT < 5.0 GeV=c. Large asymmetries at positive xF are observed (hANi = 0.086 ± 0.019), agreeing well with previous measurements of n0 and n AN, but with reach to higher xF and pT. The contribution of initial-state spin-momentum correlations to the asymmetry, as calculated in the collinear twist-3 framework, appears insufficient to describe the data.",

author = "\{PHENIX Collaboration Spokesperson\} and Abdulameer, \{N. J.\} and U. Acharya and C. Aidala and Ajitanand, \{N. N.\} and Y. Akiba and R. Akimoto and J. Alexander and D. Anderson and S. Antsupov and K. Aoki and N. Apadnia and H. Asano and Atomssa, \{E. T.\} and Awes, \{T. C.\} and B. Azmoun and V. Babintsev and M. Bai and X. Bai and B. Bannier and E. Bannikov and Barish, \{K. N.\} and S. Bathe and V. Banblis and C. Baumann and S. Baumgart and A. Bazilevsky and M. Beaumier and R. Belmont and A. Berdnikov and Y. Berdnikov and L. Bichon and D. Black and B. Blankenship and Blau, \{D. S.\} and Bok, \{J. S.\} and V. Borisov and K. Boyle and Brooks, \{M. L.\} and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Butsyk and S. Campbell and P. Chaitanya and Chen, \{C. H.\} and D. Chen and M. Chiu and Chi, \{C. Y.\} and Choi, \{I. J.\} and N. Crossette",

note = "Publisher Copyright: 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{\textquoteright}s title, journal citation, and DOI. Funded by SCOAP3",

year = "2026",

month = jan,

doi = "10.1103/6VNQ-5HFX",

language = "English",

volume = "113",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "7",

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TY - JOUR

T1 - Transverse single-spin asymmetry of forward n mesons in p + p collisions at √s = 200 GeV

AU - PHENIX Collaboration Spokesperson

AU - Abdulameer, N. J.

AU - Acharya, U.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Alexander, J.

AU - Anderson, D.

AU - Antsupov, S.

AU - Aoki, K.

AU - Apadnia, N.

AU - Asano, H.

AU - Atomssa, E. T.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bai, X.

AU - Bannier, B.

AU - Bannikov, E.

AU - Barish, K. N.

AU - Bathe, S.

AU - Banblis, V.

AU - Baumann, C.

AU - Baumgart, S.

AU - Bazilevsky, A.

AU - Beaumier, M.

AU - Belmont, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Bichon, L.

AU - Black, D.

AU - Blankenship, B.

AU - Blau, D. S.

AU - Bok, J. S.

AU - Borisov, V.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Bryslawskyj, J.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Butsyk, S.

AU - Campbell, S.

AU - Chaitanya, P.

AU - Chen, C. H.

AU - Chen, D.

AU - Chiu, M.

AU - Chi, C. Y.

AU - Choi, I. J.

AU - Crossette, N.

N1 - Publisher Copyright: 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

PY - 2026/1

Y1 - 2026/1

N2 - Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward n-meson transverse single-spin asymmetry (AN) was measured for p۴ + p collisions at ١/s = 200 GeV as a function of Feynman-x (xF) for 0.2 < jxFj < 0.8 and transverse momentum (pT) for 1.0 < pT < 5.0 GeV=c. Large asymmetries at positive xF are observed (hANi = 0.086 ± 0.019), agreeing well with previous measurements of n0 and n AN, but with reach to higher xF and pT. The contribution of initial-state spin-momentum correlations to the asymmetry, as calculated in the collinear twist-3 framework, appears insufficient to describe the data.

AB - Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward n-meson transverse single-spin asymmetry (AN) was measured for p۴ + p collisions at ١/s = 200 GeV as a function of Feynman-x (xF) for 0.2 < jxFj < 0.8 and transverse momentum (pT) for 1.0 < pT < 5.0 GeV=c. Large asymmetries at positive xF are observed (hANi = 0.086 ± 0.019), agreeing well with previous measurements of n0 and n AN, but with reach to higher xF and pT. The contribution of initial-state spin-momentum correlations to the asymmetry, as calculated in the collinear twist-3 framework, appears insufficient to describe the data.

UR - https://www.scopus.com/pages/publications/105038128561

U2 - 10.1103/6VNQ-5HFX

DO - 10.1103/6VNQ-5HFX

M3 - Article

AN - SCOPUS:105038128561

SN - 2470-0010

VL - 113

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - 072006

ER -

Transverse single-spin asymmetry of forward n mesons in p + p collisions at √s = 200 GeV

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