Predictions for p+Pb Collisions at sNN = 5TeV: Comparison with Data

Albacete, Javier L.; Arleo, François; Barnaföldi, G. G.; Barrette, J.; Deng, W.; Dumitru, Adrian; Eskola, Kari J.; Ferreiro, E. G.; Fleuret, F.; Fujii, H.; Gyulassy, Miklós; Harangozó, Szilveszter; Helenius, Ilkka; Kang, Zhong Bo; Kotko, Piotr; Kutak, Krzysztof; Lansberg, J. P.; Lévai, P.; Lin, Zi Wei; Nara, Yasushi; Rakotozafindrabe, A.; Papp, Gábor; Paukkunen, Hannu; Peigné, Stéphane; Petrovici, M.; Qiu, Jian; Rezaeian, Amir H.; Ru, Peng; Sapeta, Sebastian; Pop, V. Topor; Vitev, Ivan; Vogt, R.; Wang, Enke; Wang, Xin‐Nian; Xing, Hongxi; Xu, Rong; Zhang, Ben Wei; Zhang, Wei Ning

doi:10.1142/s0218301316300058

Cited by 33 publications

(42 citation statements)

References 137 publications

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“…Our aim here is not to argue that it is indeed the dominant effect at RHIC and the LHC. Yet, a couple of recent comparisons [1,29,30] have shown that the magnitude of the gluon modification in usual nPDF fits is in reasonnable agreement with quarkonium, D and B meson data in pPb collisions at the LHC.…”

Section: Introductionmentioning

confidence: 90%

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

2016

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We propose a simple and model-independent procedure to account for the impact of the nuclear modification of the gluon density as encoded in nuclear collinear PDF sets on two-to-two partonic hard processes in protonnucleus collisions. This applies to a good approximation to quarkonium, D and B meson production, generically referred to H. Our procedure consists in parametrising the square of the parton scattering amplitude, A gg→HX and constraining it from the proton-proton data. Doing so, we have been able to compute the corresponding nuclear modification factors for J/ψ, ϒ and D 0 as a function of y and P T at √ s NN = 5 and 8 TeV in the kinematics of the various LHC experiments in a model independent way. It is of course justified since the most important ingredient in such evaluations is the probability of each kinematical configuration. Our computations for D mesons can also be extended to B meson production. To further illustrate the potentiality of the tool, we provide -for the first time -predictions for the nuclear modification factor for η c production in pPb collisions at the LHC.

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Section: Introductionmentioning

confidence: 90%

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

2016

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“…Thus it is possible to return to the previously released R pPb results to form a measurement-based ratio rather than employing an extrapolated p + p denominator, allowing some clarification of previous controversial results, see Ref. [4]. In addition, for the first time at the LHC, data from p + p, p+Pb and Pb+Pb collisions are now available at the same energy and thus can be compared on the same level.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the higher energy allows a somewhat broader reach in rapidity so that some processes, such as Z 0 production at LHCb, see the discussion in Ref. [4], measured near the edge of phase space, can expect higher statistics and perhaps high enough significance to be included in future global fits. Similarly, the p T reach of most processes is increased.…”

Section: Introductionmentioning

confidence: 99%

Predictions for cold nuclear matter effects in p+Pb collisions at sNN=8.16 TeV

et al. 2018

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Predictions for cold nuclear matter effects on charged hadrons, identified light hadrons, quarkonium and heavy flavor hadrons, Drell-Yan dileptons, jets, photons, gauge bosons and top quark pairs produced in p+Pb collisions at √ s N N = 8.16 TeV are compiled and, where possible, compared to each other. Predictions of the normalized ratios of p+Pb to p + p cross sections are also presented for most of the observables, providing new insights into the expected role of cold nuclear matter effects. In particular, the role of nuclear parton distribution functions on particle production can now be probed over a wider range of phase space than ever before.

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“…Methodology -The cross sections measured in pA collisions at colliders are nearly always normalized to the pp ones [7,52,53] since one is primarily interested in deviations from the free nucleon case, up to isospin effects. For DIS off a nucleus A, and thus F A 2 , the NMF R[F 2 ] is directly related to the modification R A q of the (anti)quark nPDF compared to its PDF.…”

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confidence: 99%

Gluon Shadowing in Heavy-Flavor Production at the LHC

et al. 2018

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We study the relevance of experimental data on heavy-flavor [D^{0}, J/ψ, B→J/ψ and ϒ(1S) mesons] production in proton-lead collisions at the LHC to improve our knowledge of the gluon-momentum distribution inside heavy nuclei. We observe that the nuclear effects encoded in both most recent global fits of nuclear parton densities at next-to-leading order (nCTEQ15 and EPPS16) provide a good overall description of the LHC data. We interpret this as a hint that these are the dominant ones. In turn, we perform a Bayesian-reweighting analysis for each particle data sample which shows that each of the existing heavy-quark(onium) data set clearly points-with a minimal statistical significance of 7σ-to a shadowed gluon distribution at small x in the lead. Moreover, our analysis corroborates the existence of gluon antishadowing. Overall, the inclusion of such heavy-flavor data in a global fit would significantly reduce the uncertainty on the gluon density down to x≃7×10^{-6}-where no other data exist-while keeping an agreement with the other data of the global fits. Our study accounts for the factorization-scale uncertainties which dominate for the charm(onium) sector.

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Predictions for p+Pb Collisions at sNN = 5TeV: Comparison with Data

Cited by 33 publications

References 137 publications

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

Predictions for cold nuclear matter effects in p+Pb collisions at sNN=8.16 TeV

Gluon Shadowing in Heavy-Flavor Production at the LHC

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