Color Transfer in Associated Heavy-Quarkonium Production

Nayak, Gouranga C.; Qiu, Jian‐Wei; Sterman, George

doi:10.1103/physrevlett.99.212001

Cited by 53 publications

(73 citation statements)

References 18 publications

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“…Substituting the short-distance coefficients (14) to (12), or directly converting the quark amplitude squared (16) to (12), after some straightforward algebra, one then obtains the desired squared matrix element for producing J/ψ plus light hadrons.…”

Section: B Matching Strategy Adopted In This Workmentioning

confidence: 99%

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: B Matching Strategy Adopted In This Workmentioning

confidence: 99%

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

Jia

2010

Phys. Rev. D

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“…That is because the NRQCD factorization formula is designed to take into account only a heavy quark and a heavy antiquark at small relative velocity [635,636]. If an additional heavy Q orQ is nearly co-moving with a QQ pair, a color-octet QQ pair could evolve into a color-singlet QQ pair by exchanging soft gluons with the additional Q orQ.…”

Section: Difficulties In Establishing Nrqcd Factorizationmentioning

confidence: 99%

“…Measurements of such processes would provide tests of the NRQCD factorization formalism. They would also provide information about the color-transfer mechanism [635,636] (see Sect. 4.1.7), which involves soft-gluon exchanges between comoving heavy particles and is known to violate standard NRQCD factorization.…”

Section: Fig 59mentioning

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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“…Here we review new tests of NRQCD factorization for high-p T quarkonia production at next-tonext-to-leading order (NNLO) [4]. At NNLO we find infrared divergences that do not fall precisely into the pattern suggested in Ref.…”

Section: Introductionmentioning

confidence: 71%

Fragmentation, NRQCD and Factorization in Heavy Quarkonium Production

Nayak¹

2006

AIP Conference Proceedings

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Abstract. We discuss factorization in heavy quarkonium production in high energy collisions using NRQCD. Infrared divergences at NNLO are not matched by conventional NRQCD matrix elements. However, we show that gauge invariance and factorization require that conventional NRQCD production matrix elements be modified to include Wilson lines or non-abelian gauge links. With this modification NRQCD factorization for heavy quarkonium production is restored at NNLO.

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Color Transfer in Associated Heavy-Quarkonium Production

Cited by 53 publications

References 18 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

Fragmentation, NRQCD and Factorization in Heavy Quarkonium Production

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