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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10318912" target="_blank" >RIV/00216208:11320/15:10318912 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1103/PhysRevD.91.032001" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.91.032001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.91.032001" target="_blank" >10.1103/PhysRevD.91.032001</a>

Result language

angličtina

Original language name

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

Original language description

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 areconsistent 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 rangeof similar to 0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BF - Elementary particle theory and high energy physics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review D - Particles, Fields, Gravitation and Cosmology

ISSN

1550-7998

e-ISSN

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Volume of the periodical

91

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

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UT code for WoS article

000349856100001

EID of the result in the Scopus database

2-s2.0-84922261375