Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions

PHENIX Collaboration

doi:10.1103/PhysRevLett.130.251901

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions

PHENIX Collaboration

Physics and Astronomy

University of Debrecen
Georgia State University
University of Colorado Boulder
University of Michigan, Ann Arbor
Stony Brook University
RIKEN
Brookhaven National Lab
Phenix
The University of Tokyo
Howard University
Iowa State University
Kyoto University
Oak Ridge National Laboratory
United States Department of Energy
Institute for High Energy Physics
Brookhaven National Laboratory
University of Massachusetts
University of California at Riverside
City University of New York
University of North Carolina at Greensboro
Peter the Great St. Petersburg Polytechnic University
Vanderbilt University
New Mexico State University
Los Alamos National Laboratory
Columbia University
University of Illinois at Urbana-Champaign
Jeonbuk National University
University of Tsukuba

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

11 Scopus citations

Abstract

We present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p→+p→ collisions at s=510 GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at s=510 GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02<x<0.08, with direct sensitivity to the sign of the gluon contribution.

Original language	English
Article number	251901
Journal	Physical Review Letters
Volume	130
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.130.251901
State	Published - Jun 23 2023

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10.1103/PhysRevLett.130.251901

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@article{ef8f536deb564cdf84d85d6d44312535,

title = "Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions",

abstract = "We present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p→+p→ collisions at s=510 GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at s=510 GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02",

author = "\{PHENIX Collaboration\} and Abdulameer, \{N. J.\} 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 L. Bichon and D. Black and B. Blankenship 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. Campbell and \{Canoa Roman\}, V. and Chen, \{C. H.\} and M. Chiu and Chi, \{C. Y.\} and Choi, \{I. J.\} and Choi, \{J. B.\} and T. Chujo and R. Corliss and K. Dehmelt and A. Deshpande and A. Drees and R. Esha and Hemmick, \{T. K.\}",

note = "Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society.",

year = "2023",

month = jun,

day = "23",

doi = "10.1103/PhysRevLett.130.251901",

language = "English",

volume = "130",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "25",

}

TY - JOUR

T1 - Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions

AU - PHENIX Collaboration

AU - Abdulameer, N. J.

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 - Bichon, L.

AU - Black, D.

AU - Blankenship, B.

AU - Bok, J. S.

AU - Borisov, V.

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 - Chiu, M.

AU - Chi, C. Y.

AU - Choi, I. J.

AU - Choi, J. B.

AU - Chujo, T.

AU - Corliss, R.

AU - Dehmelt, K.

AU - Deshpande, A.

AU - Drees, A.

AU - Esha, R.

AU - Hemmick, T. K.

PY - 2023/6/23

Y1 - 2023/6/23

N2 - We present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p→+p→ collisions at s=510 GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at s=510 GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02

AB - We present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p→+p→ collisions at s=510 GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at s=510 GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02

UR - https://www.scopus.com/pages/publications/85164137210

U2 - 10.1103/PhysRevLett.130.251901

DO - 10.1103/PhysRevLett.130.251901

M3 - Article

C2 - 37418716

AN - SCOPUS:85164137210

SN - 0031-9007

VL - 130

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

M1 - 251901

ER -

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions

Abstract

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