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Statements

Subject Item
n2:RIV%2F68407700%3A21340%2F14%3A00220137%21RIV15-MSM-21340___
rdf:type
skos:Concept n17:Vysledek
dcterms:description
High-energy proton- and deuteron-nucleus collisions provide an excellent tool for studying a wide array of physics effects, including modifications of parton distribution functions in nuclei, gluon saturation, and color neutralization and hadronization in a nuclear environment, among others. All of these effects are expected to have a significant dependence on the size of the nuclear target and the impact parameter of the collision, also known as the collision centrality. In this article, we detail a method for determining centrality classes in p(d) + A collisions via cuts on the multiplicity at backward rapidity (i.e., the nucleus-going direction) and for determining systematic uncertainties in this procedure. For d + Au collisions at root s(NN) = 200 GeV we find that the connection to geometry is confirmed by measuring the fraction of events in which a neutron from the deuteron does not interact with the nucleus. As an application, we consider the nuclear modification factors Rp(d)+A, for which there is a bias in the measured centrality-dependent yields owing to auto correlations between the process of interest and the backward-rapidity multiplicity. We determine the bias-correction factors within this framework. This method is further tested using the HIJING Monte Carlo generator. We find that for d + Au collisions at root s(NN) = 200 GeV, these bias corrections are small and vary by less than 5% (10%) up to p(T) = 10 (20) GeV/c. In contrast, for p + Pb collisions at v root s(NN) = 5.02 TeV we find that these bias factors are an order of magnitude larger and strongly pT dependent, likely attributable to the larger effect of multiparton interactions. High-energy proton- and deuteron-nucleus collisions provide an excellent tool for studying a wide array of physics effects, including modifications of parton distribution functions in nuclei, gluon saturation, and color neutralization and hadronization in a nuclear environment, among others. All of these effects are expected to have a significant dependence on the size of the nuclear target and the impact parameter of the collision, also known as the collision centrality. In this article, we detail a method for determining centrality classes in p(d) + A collisions via cuts on the multiplicity at backward rapidity (i.e., the nucleus-going direction) and for determining systematic uncertainties in this procedure. For d + Au collisions at root s(NN) = 200 GeV we find that the connection to geometry is confirmed by measuring the fraction of events in which a neutron from the deuteron does not interact with the nucleus. As an application, we consider the nuclear modification factors Rp(d)+A, for which there is a bias in the measured centrality-dependent yields owing to auto correlations between the process of interest and the backward-rapidity multiplicity. We determine the bias-correction factors within this framework. This method is further tested using the HIJING Monte Carlo generator. We find that for d + Au collisions at root s(NN) = 200 GeV, these bias corrections are small and vary by less than 5% (10%) up to p(T) = 10 (20) GeV/c. In contrast, for p + Pb collisions at v root s(NN) = 5.02 TeV we find that these bias factors are an order of magnitude larger and strongly pT dependent, likely attributable to the larger effect of multiparton interactions.
dcterms:title
Centrality categorization for R p(d)+A in high-energy collisions Centrality categorization for R p(d)+A in high-energy collisions
skos:prefLabel
Centrality categorization for R p(d)+A in high-energy collisions Centrality categorization for R p(d)+A in high-energy collisions
skos:notation
RIV/68407700:21340/14:00220137!RIV15-MSM-21340___
n3:aktivita
n6:P n6:I n6:S
n3:aktivity
I, P(LG13031), S
n3:cisloPeriodika
3
n3:dodaniDat
n10:2015
n3:domaciTvurceVysledku
n13:5586577 n13:1560727
n3:druhVysledku
n7:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
6468
n3:idVysledku
RIV/68407700:21340/14:00220137
n3:jazykVysledku
n11:eng
n3:klicovaSlova
p + Pb collision; RHIC; PHENIX; deuteron-nucleus collisions; parton distribution function; gluon saturation; d + Au collision; KeyWords Plus:MULTIPLICITY DISTRIBUTIONS; ANGULAR-CORRELATIONS; NUCLEAR COLLISIONS; LONG-RANGE; TEV; PARTON; SCATTERING
n3:klicoveSlovo
n4:PARTON n4:RHIC n4:p%20%2B%20Pb%20collision n4:parton%20distribution%20function n4:NUCLEAR%20COLLISIONS n4:deuteron-nucleus%20collisions n4:TEV n4:SCATTERING n4:ANGULAR-CORRELATIONS n4:KeyWords%20Plus%3AMULTIPLICITY%20DISTRIBUTIONS n4:LONG-RANGE n4:gluon%20saturation n4:d%20%2B%20Au%20collision n4:PHENIX
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[CB8CD2909AFF]
n3:nazevZdroje
Physical Review C
n3:obor
n12:BF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
377
n3:projekt
n19:LG13031
n3:rokUplatneniVysledku
n10:2014
n3:svazekPeriodika
90
n3:tvurceVysledku
Aidala, C. Vrba, Václav Virius, Miroslav Adare, A. Liška, Tomáš
n3:wos
000341261600002
s:issn
0556-2813
s:numberOfPages
17
n18:doi
10.1103/PhysRevC.90.034902
n9:organizacniJednotka
21340