Study of ψ′ and χcdecays as feed-down sources ofJ/ψ hadro-production

Faccioli, P.; Lourenço, C.; Seixas, J.; Wöhri, H. K.

doi:10.1088/1126-6708/2008/10/004

Cited by 61 publications

(53 citation statements)

References 39 publications

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“…8-b) can be observed. As mentioned earlier, the ψ ′ feed-down fraction of 9.7 ± 2.4 % is in agreement with the world average of 8.1 ± 0.3 % calculated in [76].…”

Section: B Total Cross Section Of Inclusive J/ψsupporting

confidence: 90%

“…Figure 26 compares the feed-down fraction obtained from our χ c → J/ψ + γ measurement with other experiments over a broad range of collision energy and x F , as well as over many different colliding species [73,[77][78][79][80][81][82][83][84]. The value measured in this work, F J/ψ χc = 32 ± 9%, is consistent with the world average of 25 ± 5 % after accounting for A dependencies in the fixed target experiments [76] 4 . CEM estimate an energy and p T independent χ c feed-down of 40% [52] whereas recent NLO NRQCD calculations estimate 25-30% at p T = 10 GeV/c [85].…”

Section: B Total Cross Section Of Inclusive J/ψsupporting

confidence: 85%

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Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Adare¹,

Afanasiev²,

Aidala³

et al. 2012

Phys. Rev. D

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We report on charmonium measurements [J/ψ (1S), ψ ′ (2S), and χc (1P)] in p+p collisions at √ s = 200 GeV. We find that the fraction of J/ψ coming from the feed-down decay of ψ ′ and χc in the midrapidity region (|y| < 0.35) is 9.6 ± 2.4% and 32 ± 9%, respectively. We also present the pT and rapidity dependencies of the J/ψ yield measured via dielectron decay at midrapidity (|y| < 0.35) and via dimuon decay at forward rapidity (1.2 < |y| < 2.2). The statistical precision greatly exceeds that reported in our previous publication [Phys. Rev. Lett. 98, 232002 (2007)]. The new results are compared with other experiments and discussed in the context of current charmonium production models.

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“…8-b) can be observed. As mentioned earlier, the ψ ′ feed-down fraction of 9.7 ± 2.4 % is in agreement with the world average of 8.1 ± 0.3 % calculated in [76].…”

Section: B Total Cross Section Of Inclusive J/ψsupporting

confidence: 90%

Section: B Total Cross Section Of Inclusive J/ψsupporting

confidence: 85%

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Adare¹,

Afanasiev²,

Aidala³

et al. 2012

Phys. Rev. D

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“…For p+p collisions at SPS, we use the global average values of the fractions f χc = 25% from the χ c decay and f ψ ′ (2S) = 8% from the ψ ′ decay [36]. The cross sections for J/ψ, χ c and ψ ′ production in a p+p collision at the SPS are then given, respectively, by…”

Section: The Two-component Modelmentioning

confidence: 99%

Charmonium production in relativistic heavy-ion collisions

Song

Han

2011

Phys. Rev. C

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Using the two-component model that includes charmonium production from both initial nucleonnucleon hard scattering and regeneration in the produced quark-gluon plasma, we study J/ψ production in heavy-ion collisions at the SPS, RHIC and LHC. For the expansion dynamics of produced hot dense matter, we use a schematic viscous hydrodynamic model with the specific shear viscosity in the quark-gluon plasma and the hadronic matter taken, respectively, to be twice and ten times the lower bound of 1/4π suggested by the AdS/CFT correspondence. For the initial dissociation and the subsequent thermal decay of charmonia in the hot dense matter, we use the screened Cornell potential to describe the properties of charmonia and perturbative QCD to calculate their dissociation cross sections. Including regeneration of charmonia in the quark-gluon plasma via a kinetic equation with in-medium chamonium decay widths, we obtain a good description of measured J/ψ nuclear modification factors in Pb+Pb collisions at √ sNN = 1.73 GeV at SPS and in Au+Au collisions at √ sNN = 200 GeV at RHIC. A reasonable description of the measured nuclear modification factor of high transverse momenta J/ψ in Pb+Pb collisions at √ sNN = 2.76 TeV at LHC is also obtained.

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“…In addition to the directly produced J/ψ, the decays of heavier charmonium states, such as the χ c and ψ(2S), also contribute to the inclusive J/ψ yield. These two sources (direct and charmonium decays) are defined as prompt J/ψ, where the contribution from charmonium decays is about 35% as measured in pp collisions [33]. Since heavier charmonia are less strongly bound than the J/ψ they should be more easily dissolved in a deconfined medium [34].…”

mentioning

confidence: 99%

Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

Adam

Adamová

Aggarwal

et al. 2015

J. High Energ. Phys.

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Abstract:The transverse momentum (p T ) dependence of the nuclear modification factor R AA and the centrality dependence of the average transverse momentum p T for inclusive J/ψ have been measured with ALICE for Pb-Pb collisions at √ s NN = 2.76 TeV in the e + e − decay channel at mid-rapidity (|y| < 0.8). The p T is significantly smaller than the one observed for pp collisions at the same centre-of-mass energy. Consistently, an increase of R AA is observed towards low p T . These observations might be indicative of a sizable contribution of charm quark coalescence to the J/ψ production. Additionally, the fraction of non-prompt J/ψ from beauty hadron decays, f B , has been determined in the region 1.5 < p T < 10 GeV/c in three centrality intervals. No significant centrality dependence of f B is observed. Finally, the R AA of non-prompt J/ψ is discussed and compared with model predictions. The nuclear modification in the region 4.5 < p T < 10 GeV/c is found to be stronger than predicted by most models. The ALICE collaboration 26 IntroductionHeavy-ion collisions at high energies allow the study of strongly interacting matter under extreme conditions. Calculations based on Quantum-Chromo-Dynamics (QCD) on the lattice indicate that the hot and dense medium created in these collisions behaves like a strongly coupled Quark-Gluon Plasma (QGP) [1][2][3][4]. Heavy quarks are an important probe for the properties of this state of matter, since they are produced via hard partonic collisions at a very early stage and thus experience the complete evolution of the system. Quarkonium states, i.e. bound states of a heavy quark and anti-quark such as the J/ψ meson (cc state) are of particular interest. It was predicted that the J/ψ formation is suppressed in a QGP due to the screening of the cc potential in the presence of free colour charges [5]. Experimentally, a suppression of the inclusive J/ψ yield in heavy-ion collisions relative to the corresponding yield in pp, scaled by the number of binary nucleon-nucleon collisions, has been observed at the Super Proton Synchrotron (SPS) [6][7][8] and the Relativistic Heavy Ion Collider (RHIC) [9,10]. The level of suppression was found to be similar at SPS and RHIC, despite the significantly different collision energy. More recently, the nuclear modification of J/ψ was also measured for Pb-Pb collisions at the LHC [11][12][13]. While at high transverse momentum (p T > 4 GeV/c) the suppression factor is at the same level as the one observed at RHIC in the low p T region, a significant reduction of the suppression is measured towards lower p T . This has been interpreted as the effect of an additional contribution to J/ψ production at low p T , due to the combination of correlated or uncorrelated c and c quarks [14,15]. This contribution becomes sizable at LHC energies, since the number of cc pairs is much higher than at lower energies. Assuming that a deconfined phase is produced and that all the J/ψ are dissociated, this process happens at the chemical freezeout stage of the fireball ...

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Study of ψ′ and χ_cdecays as feed-down sources ofJ/ψ hadro-production

Cited by 61 publications

References 39 publications

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Charmonium production in relativistic heavy-ion collisions

Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

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