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

Bok

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7 Citations (Scopus)

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 languageEnglish
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number3
DOIs
Publication statusPublished - 2015

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pions
asymmetry
collisions
cross sections
quantum chromodynamics
predictions
systematic errors
cancellation
fragmentation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

@article{e70fcd21651b4fab9aeb0cf8723f908f,
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 ~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’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 Choi, {J. B.} and Choudhury, {R. K.} and Byungsik Hong and Park, {Sung Keun}",
year = "2015",
doi = "10.1103/PhysRevD.91.032001",
language = "English",
volume = "91",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics Publising LLC",
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 - Choi, I. J.

AU - Choi, J. B.

AU - Choudhury, R. K.

AU - Hong, Byungsik

AU - Park, Sung Keun

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.

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UR - http://www.scopus.com/inward/citedby.url?scp=84922261375&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.91.032001

DO - 10.1103/PhysRevD.91.032001

M3 - Article

AN - SCOPUS:84922261375

VL - 91

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 3

ER -