Erratum: Exclusive double-charmonium production from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>annihilation into a virtual photon [Phys. Rev. D<b>67</b>, 054007 (2003)]

Braaten, Eric; Lee, Jung-Il

doi:10.1103/physrevd.72.099901

Cited by 225 publications

(518 citation statements)

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“…For instance, for charmonium production in e + e − annihilation at the B-factory energy √ s = 10.6GeV, there are large differences between the experimental data [1,2,3] and the calculated cross sections for both exclusive processes [4] and inclusive processes [5]. Even by including the effects of e + e − annihilation into two photons in the exclusive double-charmonium production [6] and inclusive charmonium production [7], the large discrepancies still exist [8].…”

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confidence: 99%

Understanding thee⁺e⁻→D^{() +}D^{() −}processes observed by Belle

Liu

Zhang

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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We calculate the production cross sections for D * + D * − , D + D * − and D + D − in e + e − annihilation through one virtual photon in the framework of perturbative QCD with constituent quarks. The calculated cross sections for D * + D * − and D + D * − production are roughly in agreement with the recent Belle data. The helicity decomposition for D * meson production is also calculated. The fraction of the D * ± L D * ∓ T final state in e + e − → D * + D * − process is found to be 65%. The fraction of DD * T production is 100% and DD * L is forbidden in e + e − annihilation through one virtual photon. We further consider e + e − annihilation through two virtual photons, and then find the fraction of DD * T in e + e − → DD * process to be about 91%. PACS number(s): 12.40. Nn, 13.85.Ni, 14.40.Gx Recently, heavy meson production in e + e − annihilation has become a very interesting subject both experimentally and theoretically. For instance, for charmonium production in e + e − annihilation at the B-factory energy √ s = 10.6GeV, there are large differences between the experimental data [1, 2, 3] and the calculated cross sections for both exclusive processes [4] and inclusive processes [5]. Even by including the effects of e + e − annihilation into two photons in the exclusive double-charmonium production [6] and inclusive charmonium production [7], the large discrepancies still exist [8]. Moreover, most recently the Belle Collaboration has measured [9] the charmed meson pair D ( * )+ D ( * )− production in e + e − annihilation and also found a large differences between observed data and theoretical predictions [10]. The measured cross sections are σ(e + e − → D * + D * − ) = 0.65 ± 0.04 ± 0.07 pb and σ(e + e − → D + D * − ) = 0.71 ± 0.05 ± 0.09 pb, which are, however, lower than those predicted in Ref.[10] by an order of magnitude (see [9] for the comparison). The Belle measurements of the exclusive D meson pair production in e + e − annihilation could be another challenge to the theoretical studies. In order to understand these production processes, in this letter we will present a calculation in the framework of perturbative QCD with constituent quarks. Namely, we will treat the charmed mesons D ( * ) as bound states of a constituent charmed quark and a constituent light antiquark, and the virtual photon will couple to the charm quark, which will subsequently emit a light quark pair with constituent quark masses through a virtual gluon (see the upper diagram in Fig. 1). The virtuality of the virtual gluon could be large enough for the application of perturbative QCD. In addition, the case of the 1

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confidence: 99%

Understanding thee⁺e⁻→D^{() +}D^{() −}processes observed by Belle

Liu

Zhang

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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“…In the rest frame of cc pair, P µ is thus purely time-like and q µ purely space-like. Since the cc pair forms J/ψ, it is necessarily in a spin-triplet color-singlet state, and one can replace the product of the Dirac and color spinors for c and c in the final state with the following Lorentz-covariant projector [25,38]:…”

Section: Color-singlet Model Calculationmentioning

confidence: 99%

“…There is a useful relation, first derived by Gremm and Kapustin using equation of motion of NRQCD [40], relating this quantity with the pole mass of charm quark and the J/ψ mass 8 . To our purpose this relation reads [25] …”

Section: Observation Potential Of η B → J/ψ J/ψ At Tevatron and Lhcmentioning

confidence: 99%

“…In the analysis of the process e + e − → J/ψη c at B factory [25], the charm quark pole mass is taken as the commonly quoted value, 1.4 GeV, consequently v 2 J/ψ = 0.22 and v 2 ηc = 0.13. However, since m c pole contains renormalon ambiguity, it cannot be determined better within an accuracy of order Λ QCD .…”

Section: Observation Potential Of η B → J/ψ J/ψ At Tevatron and Lhcmentioning

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%

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Which hadronic decay modes are good forηbsearching: DoubleJ/ψor something else?

Jia

2008

Phys. Rev. D

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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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Erratum: Exclusive double-charmonium production frome+e−annihilation into a virtual photon [Phys. Rev. D67, 054007 (2003)]

Cited by 225 publications

References 3 publications

Understanding thee⁺e⁻→D^{() +}D^{() −}processes observed by Belle

Understanding thee⁺e⁻→D^{() +}D^{() −}processes observed by Belle

Which hadronic decay modes are good forηbsearching: DoubleJ/ψor something else?

Heavy quarkonium: progress, puzzles, and opportunities

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Erratum: Exclusive double-charmonium production frome+e−annihilation into a virtual photon [Phys. Rev. D67, 054007 (2003)]

Cited by 225 publications

References 3 publications

Understanding thee+e−→D(*) +D(*) −processes observed by Belle

Understanding thee+e−→D(*) +D(*) −processes observed by Belle

Which hadronic decay modes are good forηbsearching: DoubleJ/ψor something else?

Heavy quarkonium: progress, puzzles, and opportunities

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Understanding thee⁺e⁻→D^{() +}D^{() −}processes observed by Belle

Understanding thee⁺e⁻→D^{() +}D^{() −}processes observed by Belle