A Short Theoretical Review of Charmonium Production

Chen, Anping; Ma, Yan-Qing; Zhang, Hong

doi:10.1155/2022/7475923

Cited by 7 publications

(5 citation statements)

References 145 publications

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“…Although our understanding of hadronic production of heavy quarkonium has improved significantly owing to four decades of theoretical and experimental efforts, the underlying production mechanism is still not fully understood. For example, models fail to predict both cross-sections and polarisations of the measured S-wave heavy quarkonia states over the entire transverse momentum (p T ) and rapidity (y) range [14][15][16]. Furthermore, model calculations overestimate low-p T (p T less than the QQ invariant mass) cross-sections [14], which dominate the p T -integrated production.…”

Section: Jhep07(2023)069mentioning

confidence: 99%

“…For example, models fail to predict both cross-sections and polarisations of the measured S-wave heavy quarkonia states over the entire transverse momentum (p T ) and rapidity (y) range [14][15][16]. Furthermore, model calculations overestimate low-p T (p T less than the QQ invariant mass) cross-sections [14], which dominate the p T -integrated production. The direct measurement of heavy quarkonium cross-sections at different colliding energies is a powerful tool to test production models and provides inputs to studies using heavy ion data [17].…”

Section: Jhep07(2023)069mentioning

confidence: 99%

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Measurement of Υ production in pp collisions at $$ \sqrt{s} $$ = 5 TeV

Aaij

Abdelmotteleb

Beteta

et al. 2023

J. High Energ. Phys.

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The production cross-sections of Υ mesons, namely Υ(1S), Υ(2S) and Υ(3S), in pp collisions at $$ \sqrt{s} $$ s = 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9.13 ± 0.18 pb−1 collected by the LHCb detector. The Υ mesons are reconstructed in the decay mode Υ → μ+μ−. Double differential cross-sections times branching fractions, as functions of the transverse momentum pT and the rapidity y of the Υ mesons, are measured in the range pT< 20 GeV/c and 2.0 < y < 4.5. The results integrated over these pT and y ranges are$$ \sigma \left(\textrm{Y}(1S)\right)\times \mathcal{B}\left(\textrm{Y}(1S)\to {\mu}^{+}{\mu}^{-}\right)=2101\pm 33\pm 83\ \textrm{pb}, $$$$ \sigma \left(\textrm{Y}(2S)\right)\times \mathcal{B}\left(\textrm{Y}(2S)\to {\mu}^{+}{\mu}^{-}\right)=526\pm 20\pm 21\ \textrm{pb}, $$$$ \sigma \left(\textrm{Y}(3S)\right)\times \mathcal{B}\left(\textrm{Y}(3S)\to {\mu}^{+}{\mu}^{-}\right)=242\pm 16\pm 10\ \textrm{pb}, $$ σ Υ 1 S × B Υ 1 S → μ + μ − = 2101 ± 33 ± 83 pb , σ Υ 2 S × B Υ 2 S → μ + μ − = 526 ± 20 ± 21 pb , σ Υ 3 S × B Υ 3 S → μ + μ − = 242 ± 16 ± 10 pb , where the first uncertainties are statistical and the second are systematic. The ratios of cross-sections between measurements of two different Υ states and between measurements at different centre-of-mass energies are determined. The nuclear modification factor of Υ(1S) at $$ \sqrt{s} $$ s = 5 TeV is updated as well using the directly measured cross-section results from this analysis.

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Section: Jhep07(2023)069mentioning

confidence: 99%

Section: Jhep07(2023)069mentioning

confidence: 99%

Measurement of Υ production in pp collisions at $$ \sqrt{s} $$ = 5 TeV

Aaij

Abdelmotteleb

Beteta

et al. 2023

J. High Energ. Phys.

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“…Conversely, the leftover two gluons are attached to the valence quarks inside distinct nucleons within the nucleus. Those contributions lead to breakdown of the factorization and the approach is quite distinguished in their treatment compared to usual models in literature (see the comprehensive reviews in Andronic et al (2016); Chen et al (2022); Zhao et al (2020); Rothkopf (2020)).…”

Section: Introductionmentioning

confidence: 99%

Nuclear modification factor for quarkonium production in high energy proton‐nucleus collisions within the parton saturation approach

Rocha,

Machado

2024

Astron Nachr

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In this work, we analyze nuclear effects in the inclusive production of quarkonium in proton‐nucleus collisions at high energy regime. A theoretical framework that includes initial state effects like nuclear shadowing and gluon density saturation is considered. Numerical results for nuclear modification factor, , as a function of meson rapidity in proton‐nucleus collisions are presented. The parameter‐free predictions are compared to the available data from the Large Hadron Collider. Discussion on the main theoretical uncertainties is made, with emphasis on the phenomenological models for the nuclear saturation scale.

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“…In order to apply it to the quarkonium production, the colour-evaporation model [1,2], the color-singlet model [3][4][5] and the nonrelativistic QCD (NRQCD) factorization formalism [6] have been introduced. Among them, the NRQCD factorization formalism provides a rigorous way to calculate the theoretical prediction perturbatively, whose result can be improved by including higher order corrections of the QCD coupling constant α s and the heavy-quark relative velocity v. It is very successful when applied to many quarkonium production processes, especially the unpolarized cross section of the J/ψ hadroproduction [7][8][9][10]. However, there are still some discrepancies between the NRQCD predictions and the experimental measurements of the heavy quarkonium production.…”

Section: Introductionmentioning

confidence: 99%

Next-to-next-to-leading-order QCD corrections to J/ψ plus ηc production at the B factories

Huang

Gong

Wang

2023

J. High Energ. Phys.

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In this paper, we calculate the next-to-next-to-leading-order (NNLO) QCD corrections to e+e− → J/ψ + ηc at the B factories. After including the NNLO corrections, the cross section of e+e−→ J/ψ +ηc is enhanced by about 17%, and the perturbative series of the prediction shows the convergent behavior. It is also found that the contributions from bottom quark starts at the $$ {\alpha}_s^3 $$ α s 3 -order, which is about 2.4% of the total prediction. The renormalization scale μR dependence of the cross section is reduced at the NNLO level, but the prediction is sensitive to the charm quark mass mc. By considering the uncertainties caused by renormalization scale μR, charm quark mass mc and the NRQCD factorization scale μΛ, our prediction shows agreement with the BABAR and BELLE measurements within errors.

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A Short Theoretical Review of Charmonium Production

Cited by 7 publications

References 145 publications

Measurement of Υ production in pp collisions at $$ \sqrt{s} $$ = 5 TeV

Measurement of Υ production in pp collisions at $$ \sqrt{s} $$ = 5 TeV

Nuclear modification factor for quarkonium production in high energy proton‐nucleus collisions within the parton saturation approach

Next-to-next-to-leading-order QCD corrections to J/ψ plus ηc production at the B factories

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