Centrality categorization for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:mrow><mml:mi>p</mml:mi><mml:mo>(</mml:mo><mml:mi>d</mml:mi><mml:mo>)</mml:mo><mml:mo>+</mml:mo><mml:mi>A</mml:mi></mml:mrow></mml:msub></mml:math>in high-energy collisions

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doi:10.1103/physrevc.90.034902

Cited by 97 publications

(101 citation statements)

References 38 publications

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“…One notable effect to consider when comparing the trends of D-meson production as a function of multiplicity at central and large rapidity is that the charged-particle multiplicity was observed to scale differently with the number of nucleons involved in the p-A interaction depending on η [66,75]. In particular, at central rapidity the charged-particle multiplicity is found to scale with the number of participant nucleons, N part , while at large rapidities in the Pb-going direction (i.e.…”

Section: Resultsmentioning

confidence: 99%

Measurement of D-meson production versus multiplicity in p-Pb collisions at s N N = 5.02 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=5.02 $$ TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

J. High Energ. Phys.

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Abstract:The measurement of prompt D-meson production as a function of multiplicity in p-Pb collisions at √ s NN = 5.02 TeV with the ALICE detector at the LHC is reported. D 0 , D + and D * + mesons are reconstructed via their hadronic decay channels in the centre-of-mass rapidity range −0.96 < y cms < 0.04 and transverse momentum interval 1 < p T < 24 GeV/c. The multiplicity dependence of D-meson production is examined by either comparing yields in p-Pb collisions in different event classes, selected based on the multiplicity of produced particles or zero-degree energy, with those in pp collisions, scaled by the number of binary nucleon-nucleon collisions (nuclear modification factor); as well as by evaluating the per-event yields in p-Pb collisions in different multiplicity intervals normalised to the multiplicity-integrated ones (relative yields). The nuclear modification factors for D 0 , D + and D * + are consistent with one another. The D-meson nuclear modification factors as a function of the zero-degree energy are consistent with unity within uncertainties in the measured p T regions and event classes. The relative D-meson yields, calculated in various p T intervals, increase as a function of the charged-particle multiplicity. The results are compared with the equivalent pp measurements at √ s = 7 TeV as well as with EPOS 3 calculations.

show abstract

Section: Resultsmentioning

confidence: 99%

Measurement of D-meson production versus multiplicity in p-Pb collisions at s N N = 5.02 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=5.02 $$ TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

J. High Energ. Phys.

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“…However, in p-Pb collisions, the range of multiplicities used to select a centrality class is of similar magnitude as the fluctuations, with the consequence that a centrality selection based on multiplicity may select a biased sample of nucleon-nucleon collisions (for a discussion of this effect in d + Au; see Ref. [22]). …”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

“…The ratio of particle pseudorapidity (η) densities in d-Au and pp collisions exhibits a dependence on η, which implies that the scaling behavior has a strong rapidity dependence with an approximate N part scaling at η = 0 and an approximate scaling with the number of target participants (N target part = N part − 1) in the Au-going direction [21]. In d-Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC; √ s NN = 200 GeV), the PHENIX and STAR collaborations [22,23] have used the multiplicity measured in an η interval of width 0.9 centered at η ≈ −3.5 (Au-going direction) as a centrality estimator. The multiplicity distribution has been successfully described by the Glauber model by assuming N target part scaling.…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

See 1 more Smart Citation

Centrality dependence of particle production inp−Pbcollisions atsNN=5.02TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2015

Phys. Rev. C

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181

185

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We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at √ s NN = 5.02 TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (N part ) or the number of nucleon-nucleon binary collisions (N coll ) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the N part dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-p T the p-Pb spectra are found to be consistent with the pp spectra scaled by N coll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p-Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data.

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“…The analyzed p+p and d+Au data sets were carefully chosen, and the single central arm was used, to ensure a Au-going charge and the collision geometry has been validated through, for example, an analysis of forward neutron 207 production in d+Au collisions, and analyses of p+p collisions indicate that it should hold for events that produce 208 p T = 20 GeV hadrons [26].…”

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confidence: 99%