@article{c2746acd347f46a19191ee59dfabdeae,
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{\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 V. Cianciolo and I. Garishvili and Lajoie, {J. G.} and J. Newby and Read, {K. F.}",
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",
}