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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00522390" target="_blank" >RIV/68378271:_____/15:00522390 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/physrevd.91.032001" target="_blank" >https://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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 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.n

Název v anglickém jazyce

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

Popis výsledku anglicky

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 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.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

—

Svazek periodika

91

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

1-13

Kód UT WoS článku

000349856100001

EID výsledku v databázi Scopus

2-s2.0-84922261375