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Statements

Subject Item
n2:RIV%2F61389005%3A_____%2F12%3A00388903%21RIV13-AV0-61389005
rdf:type
skos:Concept n5:Vysledek
dcterms:description
Measurements of the sphericity of primary charged particles in minimum bias proton–proton collisions at s = 0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to the beam direction using primary charged tracks with pT > 0.5 GeV/c in |η| < 0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (Nch) is reported for events with different pT scales (“soft and “hard) defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low Nch, whereas the event generators show an opposite tendency. The combined study of the sphericity and the mean pT with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators Measurements of the sphericity of primary charged particles in minimum bias proton–proton collisions at s = 0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to the beam direction using primary charged tracks with pT > 0.5 GeV/c in |η| < 0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (Nch) is reported for events with different pT scales (“soft and “hard) defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low Nch, whereas the event generators show an opposite tendency. The combined study of the sphericity and the mean pT with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators
dcterms:title
Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at s=0.9, 2.76 and 7 TeV Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at s=0.9, 2.76 and 7 TeV
skos:prefLabel
Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at s=0.9, 2.76 and 7 TeV Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at s=0.9, 2.76 and 7 TeV
skos:notation
RIV/61389005:_____/12:00388903!RIV13-AV0-61389005
n5:predkladatel
n9:ico%3A61389005
n4:aktivita
n12:I n12:S n12:P n12:Z
n4:aktivity
I, P(LA08015), P(LK11209), S, Z(MSM6840770039)
n4:cisloPeriodika
9
n4:dodaniDat
n17:2013
n4:domaciTvurceVysledku
n8:9093311 n8:7320027 n8:9424059 n8:1780069 n8:3447758 n8:6251919
n4:druhVysledku
n11:J
n4:duvernostUdaju
n18:S
n4:entitaPredkladatele
n6:predkladatel
n4:idSjednocenehoVysledku
175006
n4:idVysledku
RIV/61389005:_____/12:00388903
n4:jazykVysledku
n7:eng
n4:klicovaSlova
energies; ALICE; LHC
n4:klicoveSlovo
n15:energies n15:ALICE n15:LHC
n4:kodStatuVydavatele
DE - Spolková republika Německo
n4:kontrolniKodProRIV
[A7F776F55388]
n4:nazevZdroje
European Physical Journal C
n4:obor
n10:BG
n4:pocetDomacichTvurcuVysledku
6
n4:pocetTvurcuVysledku
983
n4:projekt
n19:LK11209 n19:LA08015
n4:rokUplatneniVysledku
n17:2012
n4:svazekPeriodika
72
n4:tvurceVysledku
Křelina, M. Šmakal, R. Čepila, J. Adamová, Dagmar Polák, Karel Závada, Petr Pachr, M. Bielčík, J. Kushpil, Vasilij Bielčíková, Jana Tlustý, D. Zach, Č. Krus, M. Kushpil, Svetlana Pospíšil, V. Šumbera, Michal Petráček, V. Adam, J. Petráň, M. Abelev, B. Vajzer, Michal Wagner, V. Mareš, Jiří A.
n4:wos
000309707300011
n4:zamer
n14:MSM6840770039
s:issn
1434-6044
s:numberOfPages
16
n13:doi
10.1140/epjc/s10052-012-2124-9