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Hagiwara, Kaoru; Kou, E.; Lin, Z. H.; Qiao, C. F.; Zhu, Guohuai

doi:10.1103/physrevd.70.034013

Cited by 20 publications

(11 citation statements)

References 44 publications

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“…In this case, soft color exchange between the comoving quark and the constitutes of J/ψ may invalidate the NRQCD factorization at two-loop level. 2 Note that the LO NRQCD predictions to the J/ψ production associated with charmed or noncharmed hadrons are identical to the CSM predictions [25][26][27][28][29][30][31], i.e. to proceed through the parton processes e + e − → J/ψ + cc and e + e − → J/ψ + gg, respectively.…”

Section: +015mentioning

confidence: 80%

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Color-singlet relativistic correction to inclusiveJ/ψproduction associated with light hadrons atBfactories

Jia

2010

Phys. Rev. D

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We study the first-order relativistic correction to the associated production of J/ψ with light hadrons at B factory experiments at √ s = 10.58 GeV, in the context of NRQCD factorization.We employ a strategy for NRQCD expansion that slightly deviates from the orthodox doctrine, in that the matching coefficients are not truly of "short-distance" nature, but explicitly depend upon physical kinematic variables rather than partonic ones. Our matching method, with validity guaranteed by the Gremm-Kapustin relation, is particularly suited for the inclusive quarkonium production and decay processes with involved kinematics, exemplified by the process e + e − → J/ψ + gg considered in this work. Despite some intrinsic ambiguity affiliated with the orderv 2 NRQCD matrix element, if we choose its value as what has been extracted from a recent Cornell-potential-model-based analysis, including the relative order-v 2 effect is found to increase the lowest-order prediction for the integrated J/ψ cross section by about 30%, and exert a modest impact on J/ψ energy, angular and polarization distributions except near the very upper end of the J/ψ energy. The order-v 2 contribution to the energy spectrum becomes logarithmically divergent at the maximum of J/ψ energy. A consistent analysis may require that these large end-point logarithms be resummed to all orders in α s .

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Section: +015mentioning

confidence: 80%

“…The lowest-order NRQCD predictions to the J/ψ associated production rate have been available for a long while [25,[28][29][30][31]. For convenience of the reader, we collect in Appendix A the expressions for the energy distribution of (un)polarized J/ψ, at LO as well as at NLO in v 2 .…”

Section: A Choice Of Input Parametersmentioning

confidence: 99%

Color-singlet relativistic correction to inclusiveJ/ψproduction associated with light hadrons atBfactories

Jia

2010

Phys. Rev. D

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“…If one includes only the color-singlet contribution at LO in α s , then the ratio is predicted to be R cc = 0.1-0.3 (Ref. [797][798][799][800][801][802]804]), depending on the values of input parameters, such as α s , m c , and, especially, the color-singlet matrix elements. A large color-octet contribution could enhance substantially the J/ψ inclusive cross section (the denominator) but could enhance only slightly the J/ψ + cc cross section (the numerator) [803] and, therefore, would have the effect of decreasing the prediction for R cc .…”

Section: Experiments and Lo Theoretical Expectationsmentioning

confidence: 99%

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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“…Before closing, let us mention that the inclusion of color octet contributions in the end point region together with the merging with the central region expression described in this work may be useful for production processes like inclusive J= production in e e ÿ machines [50,58,59].…”

Section: Discussionmentioning

confidence: 99%

Semi-inclusive radiative decays ofΥ(1S)

Tormo

Soto

2005

Phys. Rev. D

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We discuss in detail the photon spectrum of radiative 1S decays taking into account a number of results that have recently appeared in the literature. In particular, we show how to consistently combine expressions which are valid in the upper end point region, where NRQCD factorization breaks down, with those of the central region, where NRQCD factorization holds. An excellent description of data is achieved, but theoretical errors are large.

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InclusiveJ/ψproduction ate+e−colliders

Cited by 20 publications

References 44 publications

Color-singlet relativistic correction to inclusiveJ/ψproduction associated with light hadrons atBfactories

Color-singlet relativistic correction to inclusiveJ/ψproduction associated with light hadrons atBfactories

Heavy quarkonium: progress, puzzles, and opportunities

Semi-inclusive radiative decays ofΥ(1S)

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