Inclusive cross section and double-helicity asymmetry for π^0 production at midrapidity in p + p collisions at root s=510 GeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00235758" target="_blank" >RIV/68407700:21340/16:00235758 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevD.93.011501" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.93.011501</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.93.011501" target="_blank" >10.1103/PhysRevD.93.011501</a>

Result language
angličtina
Original language name
Inclusive cross section and double-helicity asymmetry for π^0 production at midrapidity in p + p collisions at root s=510 GeV
Original language description
PHENIX measurements are presented for the cross section and double-helicity asymmetry (A_LL) in inclusive π^0 production at midrapidity from p + p collisions at root s=510 ~GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The π^0 A_LL results follow an increasingly positive asymmetry trend with p_T and root s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on π^0 and jet A_LL, and suggested a positive contribution of gluon polarization to the spin of the proton ΔG for the gluon momentum fraction range x>0.05 . The data presented here extend to a currently unexplored region, down to x~0.01 , and thus provide additional constraints on the value of ΔG . The results confirm the evidence for nonzero ΔG using a different production channel in a complementary kinematic region.
Czech name
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Czech description
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Type
J<sub>x</sub> - 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)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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