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Gong, Bin; Wang, Jianxiong

doi:10.1103/physrevd.77.054028

Cited by 123 publications

(119 citation statements)

References 21 publications

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“…This result has been confirmed in Ref. [787]. While this K factor is substantial, it does not, by itself, eliminate the discrepancy between theory and experiment.…”

Section: Theory Vs Experimentssupporting

confidence: 71%

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.

show abstract

“…This result has been confirmed in Ref. [787]. While this K factor is substantial, it does not, by itself, eliminate the discrepancy between theory and experiment.…”

Section: Theory Vs Experimentssupporting

confidence: 71%

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

“…2 Our results for the double logarithms agree diagram by diagram with those that were obtained in the complete NLO calculations in Refs. [7,8]. A new insight that follows from our analysis is that the endpoint singularity corresponds to a pinch-singular region of the loop-momentum integration in which a spectator-quark line becomes either soft or soft and collinear.…”

Section: Introductionmentioning

confidence: 92%

“…Calculations at next-to-leading order (NLO) in α s [7,8] and NLO in v 2 [9][10][11] seem to resolve this discrepancy. However, the large NLO corrections raise issues about the convergence of the α s and v expansions.…”

Section: Introductionmentioning

confidence: 99%

Double logarithms ine+e−→J/ψ+ηc
Bodwin
¹
,
Chung
²
,
Lee
³

2014
Phys. Rev. D
16
1
27
0
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Double logarithms of Q2 /m 2 c that appear in the cross section for e + e − → J/ψ + ηc at nextto-leading order (NLO) in the strong coupling αs account for the bulk of the NLO correction at B-factory energies. (Here, Q 2 is the square of the center-of-momentum energy, and mc is the charm-quark mass.) We analyze the double logarithms that appear in the contribution of each of NLO Feynman diagram, and we find that the double logarithms arise from both the Sudakov and the endpoint regions of the loop integration. The Sudakov double logarithms cancel in the sum over all diagrams. We show that the endpoint region of integration can be interpreted as a pinchsingular region in which a spectator fermion line becomes soft or soft and collinear to a produced meson. This interpretation may be important in establishing factorization theorems for helicity-flip processes, such as e + e − → J/ψ + ηc, and in resumming logarithms of Q 2 /m 2 c to all orders in αs.

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“…Stimulated by rather large QCD radiative correction to exclusive double charmonium production at B factory [30,31], one may inquire how large the effect of the nextto-leading order QCD correction to η b → J/ψJ/ψ is. It turns out that, at NLO in α s for this process, the helicity selection rule can be violated by finite charm mass, consequently one obtains the non-vanishing result even at the the leading order in velocity expansion [52].…”

Section: Discussionmentioning

confidence: 99%

“…Heavy b and c quark masses set hard scales so that we can confidently utilize pQCD to tackle this decay process, expecting those nonperturbative contributions plaguing the decay η c → V V play an insignificant role here. Since each involved particle is a heavy quarkonium, we work with the color-singlet model, in line with the calculation done for double charmonium production at e + e − colliders [25,26,27,28,29,30,31]. It is found that at the lowest order in α s , retaining the transverse momentum of c inside J/ψ is vital to obtain a non-vanishing result, and consequently, the correct asymptotic behavior of the hadronic decay branching ratio is α 2 s v 10 c (m c /m b ) 8 (v c stands for the typical velocity of c in J/ψ).…”

Section: Introductionmentioning

confidence: 99%