Heavy-flavour production in Pb–Pb collisions at the LHC, measured with the ALICE detector

Dainese, A.

doi:10.1088/0954-3899/38/12/124032

Cited by 30 publications

(30 citation statements)

References 28 publications

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“…At RHIC, this mechanism is consistent with the large suppression of non-photonic electrons [41][42][43]. The predictions [32] for D-meson suppression at the LHC are compatible with preliminary experimental results [44]. The formation times for quarkonia are also small.…”

Section: Introductionsupporting

confidence: 81%

High transverse momentum quarkonium production and dissociation in heavy ion collisions

2013

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We calculate the yields of quarkonia in heavy ion collisions at RHIC and the LHC as a function of their transverse momentum. Based upon non-relativistic quantum chromodynamics, our results include both color-singlet and color-octet contributions and feed-down effects from excited states. In reactions with ultra-relativistic nuclei, we focus on the consistent implementation of dynamically calculated nuclear matter effects, such as coherent power corrections, cold nuclear matter energy loss, and the Cronin effect in the initial state. In the final state, we consider radiative energy loss for the color-octet state and collisional dissociation of quarkonia as they traverse through the QGP. Theoretical results are presented for J/ψ and Υ and compared to experimental data where applicable. At RHIC, a good description of the high-pT J/ψ modification observed in central Cu+Cu and Au+Au collisions can be achieved within the model uncertainties. We find that measurements of J/ψ yields in proton-nucleus reactions are needed to constrain the magnitude of cold nuclear matter effects. At the LHC, a good description of the experimental data can be achieved only in mid-central and peripheral Pb+Pb collisions. The large five-fold suppression of prompt J/ψ in the most central nuclear reactions may indicate for the first time possible thermal effects at the level of the quarkonium wavefunction at large transverse momenta.

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Section: Introductionsupporting

confidence: 81%

High transverse momentum quarkonium production and dissociation in heavy ion collisions

2013

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“…Our results are consistent with the upper limit of the FONLL pQCD calculation in a wide p T region. It is observed that the charmed-hadron cross sections measured by CDF [13] and ALICE [35] at energies up to 7 TeV are also close to the upper limits of FONLL pQCD calculations. This may help set constraints on the parameters used in the FONLL calculations, e.g.…”

Section: Resultsmentioning

confidence: 60%

Measurements ofD0andDproduction inp+pcollisions at
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D*
142
8
124
0
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We report measurements of charmed-hadron (D 0 , D * ) production cross sections at mid-rapidity in p + p collisions at a center-of-mass energy of 200 GeV by the STAR experiment. Charmed hadrons were reconstructed via the hadronic decaysand their charge conjugates, covering the pT range of 0.6−2.0 GeV/c and 2.0−6.0 GeV/c for D 0 and D * + , respectively. From this analysis, the charm-pair production cross section at mid-rapidity is dσ/dy| cc y=0 = 170 ± 45 (stat.) +38 −59 (sys.) µb. The extracted charm-pair cross section is compared to perturbative QCD calculations. The transverse momentum dierential cross section is found to be consistent with the upper bound of a Fixed-Order Next-to-Leading Logarithm calculation.

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“…To estimate the effects of energy loss on the dilepton continuum, we adjust the heavy quark fragmentation functions to give a value of R AA for each flavor separately that is consistent with the measured prompt lepton R AA in central Pb+Pb collisions at high p T , R AA ∼ 0.25 − 0.30 [13], for both charm and bottom quarks. We then use these modified fragmentation functions to calculate the medium-modified dilepton distributions from heavy flavor decays.…”

Section: Dilepton Production By Hard Processesmentioning

confidence: 99%

“…The production cross sections of cc and bb pairs at √ s NN = 2.76 TeV are calculated to next-to-leading order (NLO) and their correlated contributions to the dilepton continuum are subsequently obtained. We also include the effect of energy loss of charm and bottom quarks in the medium consistent with measurements of the suppression factor R AA on the lepton spectra from semileptonic decays of charm and bottom [12,13]. These contributions are compared to direct dilepton pro-duction from the Drell-Yan process and from thermal production in the medium.…”

Section: Introductionmentioning

confidence: 99%

Components of the dilepton continuum in Pb+Pb collisions atsNN=2.76TeV

2012

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The dilepton invariant mass spectrum measured in heavy-ion collisions includes contributions from important QGP probes such as thermal radiation and the quarkonium (J/ψ, ψ ′ and Υ) states.Dileptons coming from hard qq scattering, the Drell-Yan process, contribute in all mass regions.In heavy-ion colliders, such as the LHC, semileptonic decays of heavy flavor hadrons provide a substantial contribution to the dilepton continuum. Because the dilepton continuum can provide quantitative information on heavy quark yields and their medium modifications, it is important to identify which dilepton sources populate different parts of the continuum. In the present study, we calculate cc and bb production and determine their contributions to the dilepton continuum in Pb+Pb collisions at √ s NN = 2.76 TeV with and without including heavy quark energy loss.We also calculate the rates for Drell-Yan and thermal dilepton production. The contributions to the continuum from these dilepton sources are studied in the kinematic ranges relevant for the LHC detectors. The relatively high p T cutoff for single leptons excludes most dileptons produced by the thermal medium. Heavy flavors are the dominant source of dilepton production in all the kinematic regimes except at forward rapidities where Drell-Yan dileptons become dominant for masses greater than 10 GeV/c 2 .

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Heavy-flavour production in Pb–Pb collisions at the LHC, measured with the ALICE detector

Cited by 30 publications

References 28 publications

High transverse momentum quarkonium production and dissociation in heavy ion collisions

High transverse momentum quarkonium production and dissociation in heavy ion collisions

Measurements ofD0andDproduction inp+pcollisions at
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D*
142
8
124
0
View full text Add to dashboard Cite

Components of the dilepton continuum in Pb+Pb collisions atsNN=2.76TeV

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Heavy-flavour production in Pb–Pb collisions at the LHC, measured with the ALICE detector

Cited by 30 publications

References 28 publications

High transverse momentum quarkonium production and dissociation in heavy ion collisions

High transverse momentum quarkonium production and dissociation in heavy ion collisions

Measurements ofD0andD*production inp+pcollisions atAdamczyk1, Agakishiev2, Aggarwal3 et al. 2012Phys. Rev. D14281240View full textAdd to dashboardCite

Components of the dilepton continuum in Pb+Pb collisions atsNN=2.76TeV

Contact Info

Product

Resources

About

Measurements ofD0andDproduction inp+pcollisions at
Adamczyk¹,
Agakishiev²,
Aggarwal³
et al. 2012
Phys. Rev. D*
142
8
124
0
View full text Add to dashboard Cite