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Wang, Xin‐Nian

doi:10.1103/physrevc.61.064910

Cited by 205 publications

(22 citation statements)

References 72 publications

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“…In the initial state, the modification of the parton distribution functions in a nuclear environment is predicted to lead to a stronger suppression of the heavy-quark production yields at low p T with increasing √ s NN [64], because of the smaller values of Bjorken-x probed. In addition, the momentum (k T ) broadening effect, which gives rise to an enhancement of the R AA at intermediate p T (Cronin peak), is known to be more pronounced at lower collision energies [65,66].…”

Section: Comparison With Results At Lower Collision Energymentioning

confidence: 99%

Transverse momentum dependence of D-meson production in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

J. High Energ. Phys.

130

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The production of prompt charmed mesons D 0 , D + and D * + , and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the centre-of-mass energy per nucleon pair, √ s NN , of 2.76 TeV. The production yields for rapidity |y| < 0.5 are presented as a function of transverse momentum, p T , in the interval 1-36 GeV/c for the centrality class 0-10% and in the interval 1-16 GeV/c for the centrality class 30-50%. The nuclear modification factor R AA was computed using a proton-proton reference at √ s = 2.76 TeV, based on measurements at √ s = 7 TeV and on theoretical calculations. A maximum suppression by a factor of 5-6 with respect to binary-scaled pp yields is observed for the most central collisions at p T of about 10 GeV/c. A suppression by a factor of about 2-3 persists at the highest p T covered by the measurements. At low p T (1-3 GeV/c), the R AA has large uncertainties that span the range 0.35 (factor of about 3 suppression) to 1 (no suppression). In all p T intervals, the R AA is larger in the 30-50% centrality class compared to central collisions. The D-meson R AA is also compared with that of charged pions and, at large p T , charged hadrons, and with model calculations. The ALICE collaboration 36 IntroductionA state of strongly-interacting matter characterised by high energy density and temperature is predicted to be formed in ultra-relativistic collisions of heavy nuclei. According to calculations using Quantum Chromodynamics (QCD) on the lattice, these extreme conditions lead to the formation of a Quark-Gluon Plasma (QGP) state, in which quarks and gluons are deconfined, and chiral symmetry is partially restored (see e.g. [1][2][3][4]). Heavy quarks are produced in the hard scattering processes that occur in the early stage of the collision between partons of the incoming nuclei. Their production is characterised by a timescale ∆t < 1/(2 m c,b ), ∼ 0.1 fm/c for charm and ∼ 0.01 fm/c for beauty quarks, that is shorter than the formation time of the QGP medium, about 0.3 fm/c at Large Hadron Collider (LHC) energies [5]. They can successively interact with the constituents of the medium and lose part of their energy, via inelastic processes (gluon radiation) [6,7] or elastic scatterings (collisional processes) [8][9][10]. Energy loss can be studied using the -1 - JHEP03(2016)081nuclear modification factor R AA , which compares the transverse-momentum (p T ) differential production yields in nucleus-nucleus collisions (dN AA /dp T ) with the cross section in proton-proton collisions (dσ pp /dp T ) scaled by the average nuclear overlap function ( T AA )· dN AA /dp T dσ pp /dp T .(1.1)The average nuclear overlap function T AA over a centrality class is proportional to the number of binary nucleon-nucleon collisions per A-A collision in that class and it can be estimated via Glauber model calculations [11,12]. According to QCD calculations, quarks are expected to lose less energy than gluons because their coupling to the medium is smaller [6,7]. In the energy regime of the...

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Section: Comparison With Results At Lower Collision Energymentioning

confidence: 99%

Transverse momentum dependence of D-meson production in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

J. High Energ. Phys.

130

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“…The leading twist nuclear shadowing calculation [60] assumes the GlauberGribov approach of the collision geometry and predicts the dependence of the nPDF on the collision impact parameter. The estimates of the initial-state k T broadening due to multiple soft collisions also consider a dependence on the collision impact parameter [46,47]. Initial-state parton energy loss is also expected to evolve with the collision geometry as a consequence of the different nuclear density, though detailed calculations including this effect are not yet available.…”

Section: Jhep08(2016)078mentioning

confidence: 99%

“…Alternatively, when the production process is dominated by gluons at low Bjorken-x, the nucleus can be described by the Colour-Glass Condensate (CGC) effective theory as a coherent and saturated gluonic system [41][42][43][44]. The kinematics of the partons in the initial state can be affected by multiple scatterings (transverse momentum broadening, or k T broadening) [45][46][47] or by gluon radiation (energy loss) [48] before the heavy-quark pair is produced. Gluon radiation may also occur after the heavy-quark pair…”

Section: Jhep08(2016)078mentioning

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.

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“…At the large hadron collider (LHC) energies, the most relevant effects are parton-density shadowing or gluon saturation, which can be described using modified parton distribution functions in the nucleus [6] or using the color glass condensate (CGC) effective theory [7,8]. Partons can also lose energy in the early stages of the collision via initial-state radiation, thus modifying the centre-of-mass energy of the partonic system [9], or experience transverse momentum broadening due to multiple soft collisions before the bb pair is produced [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Prompt and non-prompt $$\hbox {J}/\psi $$ J / ψ production and nuclear modification at mid-rapidity in p–Pb collisions at $$\mathbf{\sqrt{{ s}_{\text {NN}}}= 5.02}$$

Acharya¹,

Acosta²,

Adamová³

et al. 2018

Eur. Phys. J. C

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A measurement of beauty hadron production at mid-rapidity in proton-lead collisions at a nucleon-nucleon centre-of-mass energy √ s NN = 5.02 TeV is presented. The semi-inclusive decay channel of beauty hadrons into J/ψ is considered, where the J/ψ mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The bb production cross section at mid-rapidity, dσ bb /dy, and the total cross section extrapolated over full phase space, σ bb , are obtained. This measurement is combined with results on inclusive J/ψ production to determine the prompt J/ψ cross sections. The results in p-Pb collisions are then scaled to expectations from pp collisions at the same centre-of-mass energy to derive the nuclear modification factor R pPb , and compared to models to study possible nuclear modifications of the production induced by cold nuclear matter effects. R pPb is found to be smaller than unity at low p T for both J/ψ coming from beauty hadron decays and prompt J/ψ .

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Systematic study of highpThadron spectra inpp,pA,

Cited by 205 publications

References 72 publications

Transverse momentum dependence of D-meson production in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV

Transverse momentum dependence of D-meson production in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV

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

Prompt and non-prompt $$\hbox {J}/\psi $$ J / ψ production and nuclear modification at mid-rapidity in p–Pb collisions at $$\mathbf{\sqrt{{ s}_{\text {NN}}}= 5.02}$$

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