Reconciling<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>Production at HERA, RHIC, Tevatron, and LHC with Nonrelativistic QCD Factorization at Next-to-Leading Order

Butenschön, Mathias; Kniehl, Bernd A.

doi:10.1103/physrevlett.106.022003

Cited by 221 publications

(200 citation statements)

References 35 publications

(48 reference statements)

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“…For a more sophisticated fitting of the color-octet matrix elements including NLO effects, see [57][58][59]. The matrix elements including feed-down effects obtained in [59] are similar, albeit slightly smaller than our estimates.…”

Section: Matrix Elements For Quarkonia Productionsupporting

confidence: 53%

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: Matrix Elements For Quarkonia Productionsupporting

confidence: 53%

High transverse momentum quarkonium production and dissociation in heavy ion collisions

2013

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“…For the CSM comparison, we used the recent NLO calculation only for the direct J/ψ yield at RHIC energy and PHENIX rapidity coverage [17]. We used two NRQCD calculations [20,51] in our comparisons. The calculation performed for the direct J/ψ plus χ c feed-down in [20] uses NLO diagrams for the color singlet and color octet states with a long range matrix element tuned from experimental hadroproduction [21] and photoproduction [22,23] results.…”

Section: Results Discussionmentioning

confidence: 99%

“…We used two NRQCD calculations [20,51] in our comparisons. The calculation performed for the direct J/ψ plus χ c feed-down in [20] uses NLO diagrams for the color singlet and color octet states with a long range matrix element tuned from experimental hadroproduction [21] and photoproduction [22,23] results. This calculation is only available for the differential p T dependent cross section.…”

Section: Results Discussionmentioning

confidence: 99%

“…All of the models predict a downward trend, but the CEM and NRQCD calculations do not follow a slope as large as the data. Transverse momentum dependence of (top) J/ψ yield in |y| < 0.35 and 1.2 < |y| < 2.2 along with predictions based on CSM [17], NRQCD [20], CEM [52,53] and B-meson decay based on FONLL calculation [3]. All models use CTEQ6M [44].…”

Section: B Total Cross Section Of Inclusive J/ψmentioning

confidence: 99%

“…NRQCD calculations tuned with J/ψ and ψ ′ p T spectra from CDF were able to qualitatively describe the first PHENIX J/ψ cross section and polarization results [18] albeit within large experimental uncertainties, but failed to describe the J/ψ and ψ ′ polarization observed in CDF [19] (see [15] for a recent review). Recent NRQCD calculations [20] include color singlet and color octet NLO short range terms along with a long-range matrix parametrization from experimental hadroproduction [21] and photoproduction [22,23] of J/ψ mesons. A similar study was performed using CDF data with consistent results [24].…”

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confidence: 99%

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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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Polarization in Cascade Decays

Faccioli

Lourenço

2022

Particle Polarization in High Energy Physics

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This chapter addresses the case of a vector particle produced indirectly from the decay or transformation of a particle having $$J = 0$$ ($$\chi_{c0} \to \mathrm{J}/\psi \, \gamma$$, $$\mathrm{B} \to \mathrm{J}/\psi \, \mathrm{K}$$, $$\mathrm{H} \to \mathrm{Z} \, \gamma$$, etc.), $$J = 1$$ or $$J = 2$$ ($$\chi_{c1,2} \to \mathrm{J}/\psi \, \gamma$$, $$\mathrm{Z} \to \mathrm{J}/\psi \, \gamma$$, etc.), describing the polarization frame definitions that can be adopted to represent the two-step process, and their respective advantages. We illustrate how several measurement and kinematic conditions can lead to very different observable polarizations of the vector particle, in the special but frequent case where the intermediate decay step remains unobserved and only the final dilepton angular distribution is measured. We also discuss how the peculiar observation, made at the LHC, of almost unpolarized “directly” produced J/$$\psi$$ mesons may be understood as the result of a two-step production mechanism.

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ReconcilingJ/ψProduction at HERA, RHIC, Tevatron, and LHC with Nonrelativistic QCD Factorization at Next-to-Leading Order

Cited by 221 publications

References 35 publications

High transverse momentum quarkonium production and dissociation in heavy ion collisions

High transverse momentum quarkonium production and dissociation in heavy ion collisions

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

Polarization in Cascade Decays

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