Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV

Bok

doi:10.1103/PhysRevD.91.032001

Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV

Bok

Stony Brook University

University of Colorado Boulder
Los Alamos National Laboratory
University of Michigan, Ann Arbor
Stony Brook University
RIKEN
Brookhaven National Lab
The University of Tokyo
New Mexico State University
Abilene Christian University
Columbia University
Vanderbilt University
University of California at Riverside
Brookhaven National Laboratory
Oak Ridge National Laboratory
Institute for High Energy Physics
University of New Mexico
City University of New York
Petersburg Nuclear Physics Institute (PNPI)
University of Münster
Muhlenberg College
Russian Research Centre Kurchatov Institute
Yonsei University

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

20 Scopus citations

Abstract

We present midrapidity charged-pion invariant cross sections, the ratio of the π^- to π⁺ cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at p√s = 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of ~0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.

Original language	English
Article number	032001
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	91
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.91.032001
State	Published - 2015

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10.1103/PhysRevD.91.032001

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@article{60edbdc864734339955c996ae91d78b5,

title = "Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV",

abstract = "We present midrapidity charged-pion invariant cross sections, the ratio of the π- to π+ cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at p√s = 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of \textasciitilde{}0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.",

author = "Bok and A. Adare and C. Aidala and Ajitanand, \{N. N.\} and Y. Akiba and R. Akimoto and H. Al-Ta{\textquoteright}ani and J. Alexander and Andrews, \{K. R.\} and A. Angerami and K. Aoki and N. Apadula and E. Appelt and Y. Aramaki and R. Armendariz and Aschenauer, \{E. C.\} and Atomssa, \{E. T.\} and Awes, \{T. C.\} and B. Azmoun and V. Babintsev and M. Bai and B. Bannier and Barish, \{K. N.\} and B. Bassalleck and Basye, \{A. T.\} and S. Bathe and V. Baublis and C. Baumann and A. Bazilevsky and R. Belmont and J. Ben-Benjamin and R. Bennett and Blau, \{D. S.\} and Bok, \{J. S.\} and K. Boyle and Brooks, \{M. L.\} and D. Broxmeyer and H. Buesching and V. Bumazhnov and G. Bunce and S. Butsyk and S. Campbell and P. Castera and Chen, \{C. H.\} and Chi, \{C. Y.\} and M. Chiu and Abhay Deshpande and A. Drees and Hemmick, \{T. K.\} and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

doi = "10.1103/PhysRevD.91.032001",

language = "English",

volume = "91",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "3",

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TY - JOUR

T1 - Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV

AU - Bok

AU - Adare, A.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Al-Ta’ani, H.

AU - Alexander, J.

AU - Andrews, K. R.

AU - Angerami, A.

AU - Aoki, K.

AU - Apadula, N.

AU - Appelt, E.

AU - Aramaki, Y.

AU - Armendariz, R.

AU - Aschenauer, E. C.

AU - Atomssa, E. T.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bannier, B.

AU - Barish, K. N.

AU - Bassalleck, B.

AU - Basye, A. T.

AU - Bathe, S.

AU - Baublis, V.

AU - Baumann, C.

AU - Bazilevsky, A.

AU - Belmont, R.

AU - Ben-Benjamin, J.

AU - Bennett, R.

AU - Blau, D. S.

AU - Bok, J. S.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Broxmeyer, D.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Bunce, G.

AU - Butsyk, S.

AU - Campbell, S.

AU - Castera, P.

AU - Chen, C. H.

AU - Chi, C. Y.

AU - Chiu, M.

AU - Deshpande, Abhay

AU - Drees, A.

AU - Hemmick, T. K.

AU - Jia, J.

AU - Lacey, R.

PY - 2015

Y1 - 2015

N2 - We present midrapidity charged-pion invariant cross sections, the ratio of the π- to π+ cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at p√s = 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of ~0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.

AB - We present midrapidity charged-pion invariant cross sections, the ratio of the π- to π+ cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at p√s = 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of ~0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.

UR - https://www.scopus.com/pages/publications/84922261375

U2 - 10.1103/PhysRevD.91.032001

DO - 10.1103/PhysRevD.91.032001

M3 - Article

SN - 1550-7998

VL - 91

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 3

M1 - 032001

ER -

Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV

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