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Charged-pion cross sections and double-helicity asymmetries in polarized p plus p collisions at root s=200 GeV

Adare, A.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Al-Ta'ani, H.; Alexander, J.; Andrews, K. R.; Angerami, A. and Aoki, K., et al. (2015) In Physical Review D (Particles, Fields, Gravitation and Cosmology) 91(3).
Abstract
We present midrapidity charged-pion invariant cross sections, the ratio of the pi(-) to pi(+) cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at root s = p + 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... (More)
We present midrapidity charged-pion invariant cross sections, the ratio of the pi(-) to pi(+) cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at root s = p + 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 similar to 0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution. (Less)
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Physical Review D (Particles, Fields, Gravitation and Cosmology)
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91
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American Physical Society
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  • wos:000349856100001
  • scopus:84922261375
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1550-2368
DOI
10.1103/PhysRevD.91.032001
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English
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@article{ffcd13c1-00af-4c6e-b178-9a6849bc19f3,
  abstract     = {We present midrapidity charged-pion invariant cross sections, the ratio of the pi(-) to pi(+) cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at root s = p + 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 similar to 0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.},
  articleno    = {032001},
  author       = {Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Ta'ani, H. and Alexander, J. and Andrews, K. R. and Angerami, A. and Aoki, K. and Apadula, N. and Appelt, E. and Aramaki, Y. and Armendariz, R. and Aschenauer, E. C. and Atomssa, E. T. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bannier, B. and Barish, K. N. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Baublis, V. and Baumann, C. and Bazilevsky, A. and Belmont, R. and Ben-Benjamin, J. and Bennett, R. and Blau, D. S. and Bok, J. S. and Boyle, K. and Brooks, M. L. and Broxmeyer, D. and Buesching, H. and Bumazhnov, V. and Bunce, G. and Butsyk, S. and Campbell, S. and Castera, P. and Chen, C. -H. and Chi, C. Y. and Chiu, M. and Choi, I. J. and Choi, J. B. and Choudhury, R. K. and Christiansen, Peter and Chujo, T. and Chvala, O. and Cianciolo, V. and Citron, Z. and Cole, B. A. and del Valle, Z. Conesa and Connors, M. and Csanad, M. and Csoergo, T. and Dairaku, S. and Datta, A. and David, G. and Dayananda, M. K. and Denisov, A. and Deshpande, A. and Desmond, E. J. and Dharmawardane, K. V. and Dietzsch, O. and Dion, A. and Donadelli, M. and Drapier, O. and Drees, A. and Drees, K. A. and Durham, J. M. and Durum, A. and D'Orazio, L. and Efremenko, Y. V. and Engelmore, T. and Enokizono, A. and En'yo, H. and Esumi, S. and Fadem, B. and Fields, D. E. and Finger, M. and Finger, M. Jr. and Fleuret, F. and Fokin, S. L. and Frantz, J. E. and Franz, A. and Frawley, A. D. and Fukao, Y. and Fusayasu, T. and Gal, C. and Garishvili, I. and Giordano, F. and Glenn, A. and Gong, X. and Gonin, M. and Goto, Y. and de Cassagnac, R. Granier and Grau, N. and Greene, S. V. and Perdekamp, M. Grosse and Gunji, T. and Guo, L. and Gustafsson, Hans-Åke and Haggerty, J. S. and Hahn, K. 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  issn         = {1550-2368},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review D (Particles, Fields, Gravitation and Cosmology)},
  title        = {Charged-pion cross sections and double-helicity asymmetries in polarized p plus p collisions at root s=200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevD.91.032001},
  volume       = {91},
  year         = {2015},
}