Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p +p collisions at sroot =200??GeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F14%3A00218723" target="_blank" >RIV/68407700:21340/14:00218723 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevD.90.012007" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.90.012007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.90.012007" target="_blank" >10.1103/PhysRevD.90.012007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p +p collisions at sroot =200??GeV

Popis výsledku v původním jazyce

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, ALL, for ?0 and ? production in sroot =200??GeV polarized p+p collisions. Comparison of the ?0 results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, ?G, in the proton in the probed Bjorken x range. The effect of adding the new 2009 ?0 data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit value ?G[0.05,0.2]DSSV=0.06+0.11-0.15 in the range 0.05<x<0.2, with the uncertainty at ??2=9 when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of ?G[0.05,0.2]DSSV between 0.02 and 0.12, demonstrating the need for full treatment of the experimental systematic uncertainties in future global an

Název v anglickém jazyce

Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p +p collisions at sroot =200??GeV

Popis výsledku anglicky

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, ALL, for ?0 and ? production in sroot =200??GeV polarized p+p collisions. Comparison of the ?0 results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, ?G, in the proton in the probed Bjorken x range. The effect of adding the new 2009 ?0 data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit value ?G[0.05,0.2]DSSV=0.06+0.11-0.15 in the range 0.05<x<0.2, with the uncertainty at ??2=9 when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of ?G[0.05,0.2]DSSV between 0.02 and 0.12, demonstrating the need for full treatment of the experimental systematic uncertainties in future global an

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BF - Elementární částice a fyzika vysokých energií

OECD FORD obor

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Projekt

<a href="/cs/project/LG13031" target="_blank" >LG13031: Spolupráce ČR s CERN</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Physical Review D

ISSN

1550-7998

e-ISSN

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Svazek periodika

90

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

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Kód UT WoS článku

000339067000002

EID výsledku v databázi Scopus

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