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

University of Colorado Boulder
MST-8, Los Alamos National Laboratory
University of Michigan, Ann Arbor
Stony Brook University
RIKEN Nishina Center for Accelerator-Based Science
Riken BNL Research Center
University of Tokyo
New Mexico State University
Abilene Christian University
Columbia University
Vanderbilt University
University of California, Riverside
Brookhaven National Laboratory
Oak Ridge National Laboratory
Kurchatov Institute
University of New Mexico
Baruch College
Petersburg Nuclear Physics Institute (PNPI)
University of Münster
Muhlenberg College
Kurchatov Institute
Yonsei University
University of Illinois at Urbana-Champaign
Chonbuk National University
Bhabha Atomic Research Centre
Lund University
University of Tsukuba
Eötvös Loránd University
Hungarian Academy of Sciences
Kyoto University
UMass Amherst
Georgia State University
University of São Paulo
Iowa State University
University of Maryland, College Park
Charles University
Ohio University
Florida State University
Nagasaki Institute of Applied Science
University of Tennessee
Lawrence Livermore National Laboratory
Augustana College
Ewha Womans University
Tsinghua University
Rikkyo University
Hiroshima University
Korea University
High Energy Accelerator Research Organization (KEK)
Japan Atomic Energy Agency
Myongji University
Université Paris-Saclay
Hanyang University
Helsinki Institute of Physics
Czech Technical University in Prague
China Institute of Atomic Energy
Weizmann Institute of Science Israel
Tokyo Institute of Technology
Institute for Nuclear Research of the Russian Academy of Sciences
Institut Pierre Simon Laplace, CNRS and CEA
Université Blaise Pascal
Banaras Hindu University
National Research Nuclear University MEPhI
Institute of Physics of the Czech Academy of Sciences
Lahore University of Management Sciences

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

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
Publication status	Published - 1 Jan 2015

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10.1103/PhysRevD.91.032001

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@article{81e18c3f813143628323ec4d69657bbc,

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 Choi, \{I. J.\} and O. Drapier and F. Fleuret and M. Gonin and M. Nguyen",

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

year = "2015",

month = jan,

day = "1",

doi = "10.1103/PhysRevD.91.032001",

language = "English",

volume = "91",

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

issn = "1550-7998",

number = "3",

}

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 - Choi, I. J.

AU - Drapier, O.

AU - Fleuret, F.

AU - Gonin, M.

AU - Nguyen, M.

PY - 2015/1/1

Y1 - 2015/1/1

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.

U2 - 10.1103/PhysRevD.91.032001

DO - 10.1103/PhysRevD.91.032001

M3 - Article

AN - SCOPUS:84922261375

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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