Inclusive production of<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>meson in proton-proton collisions at BNL RHIC

Baranov, S. P.; Szczurek, Antoni

doi:10.1103/physrevd.77.054016

Cited by 39 publications

(64 citation statements)

References 55 publications

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“…56. A similar trend for the polarization as a function of p T is found in some other analyses of the color-singlet channel, such those in the k T factorization approach [639][640][641][642] (see Fig. 55), the gluon-tower approach [680], and the s-channel-QQcut approach [681,682].…”

Section: Quarkonium Polarization: a Key Observablesupporting

confidence: 54%

“…The processes in which the QQ pair is produced by the exchange of two gluons in the t channel [ Fig. 50(f)] were investigated in the k T -factorization approach [639][640][641][642]. This approach is relevant in the high-energy limit s ŝ, where s (ŝ) denotes the square of the total four-momentum of the colliding hadrons (partons).…”

Section: −4mentioning

confidence: 99%

“…In the case of quarkonium production, the k T -factorization approach has usually been applied within the CSM [637][638][639][640][641][642]. In k T -factorization formulas, the parton distributions for the initial-state hadrons depend on the parton transverse momentum, as well as on the parton longitudinal momentum fraction.…”

Section: Kt Factorizationmentioning

confidence: 99%

See 2 more Smart Citations

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

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Section: Quarkonium Polarization: a Key Observablesupporting

confidence: 54%

Section: −4mentioning

confidence: 99%

See 1 more Smart Citation

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

View full text Add to dashboard Cite

show abstract

“…In the k t -factorization approach, the differential cross section can be written as dσðpp → J/ψgXÞ dy J/ψ dy g d 2 where F g are unintegrated (or transverse-momentumdependent) gluon distributions. The matrix elements were calculated as was explained, for example, in [11,12] …”

Section: A Main Contributionsmentioning

confidence: 99%

Prompt inclusive production of J/ψ , ψ′ and χc meson

Cisek

Szczurek

2018

Phys. Rev. D

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We discuss prompt production of J/ψ mesons in proton-proton collisions at the LHC within the NRQCD k t -factorization approach using Kimber-Martin-Ryskin (KMR) unintegrated gluon distributions (UGDF). We include both direct color-singlet production (gg → J/ψg) as well as a feed down from χ c → J/ψγ and ψ 0 → J/ψX decays. The production of the decaying mesons (χ c or ψ 0 ) is also calculated within the NRQCD k t -factorization approach. The corresponding matrix elements for gg → J/ψ g, gg → ψ 0 g and gg → χ c include parameters of the nonrelativistic space wave functions of the quarkonia at r ¼ 0, which are taken from potential models in the literature. We get the ratio of the corresponding cross section ratio for χ c ð2Þ-to-χ c ð1Þ at midrapidities much closer to experimental data than obtained in a recent analysis. Differential distributions in rapidity and transverse momentum of J/ψ and ψ 0 are calculated and compared with experimental data of the ALICE and LHCb Collaborations. We discuss a possible onset of gluon saturation effects in the production of J/ψ and χ c mesons at forward/backward rapidities. We show that it is necessary to modify the standard KMR UGDF to describe ALICE and LHCb data. A mixed UGDF scenario was proposed. Then, we can describe the experimental data for J/ψ production within model uncertainties with a color-singlet component only. Therefore, our theoretical results leave only relatively small room for the color-octet contributions. We discuss relations to other models in the literature. The results for the so-called hybrid model are compared to the results of the original k t -factorization approach.

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“…For this reason, we adopt a dipole model which naturally incorporates all saturation effects and has been applied to the description ofcc production in [36][37][38][39][40]. Since the produced dipoles are small and have a typical size r cc ∼ m −1 c , up to O (1/m c )-corrections this approach is equivalent to a k T -factorization approach suggested in [41][42][43], taking into account the relation of the dipole cross-section and the unintegrated gluon PDF F (x, k ⊥ ) suggested in [44].…”

Section: Pentaquark Production Mechanismsmentioning

confidence: 99%

Production of pentaquarks inpA-collisions

Schmidt

Siddikov

2016

Phys. Rev. D

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We argue that a hidden-charm pentaquark recently observed in weak decays of Λ b can be produced in proton-nucleus collisions without electroweak intermediaries. We analyze the production crosssection for several scenarios of internal structure and find that a cross-section is sizable. This process can be studied both in collider as well as in fixed-target experiments. In the former case, the pentaquarks are produced at very forward rapidities, whereas in the latter case, pentaquarks are produced with relatively small rapidities and can be easily detected via invariant mass distribution of a forward J/ψ and a comoving proton. Additionally, the suggested process allows to check the existence of a neutral pentaquark P 0 c (an isospin partner of P + c ) predicted in several models. The rapidity and transverse momentum distributions of pentaquarks could provide comprehensive information about thecc component of this exotic baryon.

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Inclusive production ofJ/ψmeson in proton-proton collisions at BNL RHIC

Cited by 39 publications

References 55 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

Prompt inclusive production of J/ψ , ψ′ and χc meson

Production of pentaquarks inpA-collisions

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