Problems of double-charm production in e+e− annihilation at s=10.6 GeV

Liu, Kui-Yong; He, Zhi‐Guo; Chao, Kuang-Ta

doi:10.1016/s0370-2693(03)00176-x

Cited by 202 publications

(195 citation statements)

References 18 publications

(7 reference statements)

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“…Especially, the attempts in [23,24] open a way to connect the predictions of hard quarkonium exclusive productions within the collinear factorization directly to those made within the NRQCD factorization (for examples, the many theoretical calculations based on NRQCD factorizations [25][26][27][28][29][30][31][32][33][34][35][36][37][38], triggered by the recent experimental measurements of charmonium exclusive productions at B-factories [39][40][41]). In particular, in [42,43], the authors have shown that the collinear factorization indeed can reproduce the exact asymptotic behavior of NRQCD predictions at the leading logarithms (LL) and next-toleading order (NLO) of the strong coupling α s , respectively, for a certain class of the quarkonium exclusive productions, if one employs the leading twist LCDAs calculated in [24]; and the ERBL equations can be used to resum the large logarithms appearing the NRQCD factorization calculations for the exclusive quarkonium productions, while such resummation cannot be done within the NRQCD factorization.…”

Section: Jhep06(2014)121mentioning

confidence: 99%

The leading twist light-cone distribution amplitudes for the S-wave and P-wave quarkonia and their applications in single quarkonium exclusive productions

Wang

Yang

2014

J. High Energ. Phys.

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In this paper, we calculate twist-2 light-cone distribution amplitudes (LCDAs) of the S-wave and P-wave quarkonia (namely 1 S 0 state η Q , 3 S 1 state J/ψ(Υ), 1 P 1 state h Q and 3 P J states χ QJ with J = 0, 1, 2 and Q = c, b) to the next-leading order of the strong coupling α s and leading order of the velocity expansion v in the non-relativistic QCD (NRQCD). We apply these LCDAs to some single quarkonium exclusive productions at large center-of-mass energy, such as γ * → η Q γ, χ QJ γ (J = 0, 1, 2), Z → η Q γ, χ QJ γ (J = 0, 1, 2), J/ψ(Υ)γ, h Q γ and h → J/ψγ, by adopting the collinear factorization. The asymptotic behaviors of those processes obtained in NRQCD factorization are reproduced.

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Section: Jhep06(2014)121mentioning

confidence: 99%

The leading twist light-cone distribution amplitudes for the S-wave and P-wave quarkonia and their applications in single quarkonium exclusive productions

Wang

Yang

2014

J. High Energ. Phys.

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“…First we recall the continuum double charmonium cross section in the lowest order in α s and v 2 c [21,22]:…”

Section: Phenomenology a Determination Of K From B Factories Mementioning

confidence: 99%

Exclusive double charmonium production fromΥdecay

Jia

2007

Phys. Rev. D

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The exclusive decay of Υ to a vector plus pseudoscalar charmonium is studied in perturbative QCD. The corresponding branching ratios are predicted to be of order 10 −6 for first three Υ resonances, and we expect these decay modes should be discovered in the prospective high-luminosity e + e − facilities such as super B experiment. As a manifestation of the short-distance loop contribution, the relative phases among strong, electromagnetic and radiative decay amplitudes can be deduced. It is particularly interesting to find that the relative phase between strong and electromagnetic amplitudes is nearly orthogonal. The resonance-continuum interference effect for double charmonium production near various Υ resonances in e + e − annihilation is addressed. * Electronic address: jiay@ihep.ac.cn

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“…The exclusive production of charmonium pairs has in fact been observed recently with a substantial rate at Belle [8]. The rates for exclusive charmoniumpair production reported by Belle are significantly larger than predictions based on pQCD [9,10]. The Belle experiment identifies one member of the pair, the J/ψ, via its leptonic decay; the other quarkonium state is inferred by identifying the missing mass of the spectator system with the charmonium states η c , χ c0 , and η c (2S) which occur within the detector mass resolution.…”

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confidence: 99%

Hunting for Glueballs in Electron-Positron Annihilation

2003

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We calculate the cross section for the exclusive production of J P C = 0 ++ glueballs G0 in association with the J/ψ in e + e − annihilation using the pQCD factorization formalism. The required long-distance matrix element for the glueball is bounded by CUSB data from a search for resonances in radiative Υ decay. The cross section for e + e − → J/ψ + G0 at √ s = 10.6 GeV is similar to exclusive charmonium-pair production e + e − → J/ψ + h for h = ηc and χc0, and is larger by a factor 2 than that for h = ηc(2S). As the subprocesses γ * → (cc)(cc) and γ * → (cc)(gg) are of the same nominal order in perturbative QCD, it is possible that some portion of the anomalously large signal observed by Belle in e + e − → J/ψX may actually be due to the production of charmonium-glueball J/ψGJ pairs.Bound states of gluons provide an explicit signature of the non-Abelian interactions of quantum chromodynamics. In fact, in a model universe without quarks, the hadronic spectrum of QCD would consist solely of color-singlet glueball states. In the physical world, the purely gluonic components mix with qq pairs, leading to an enriched spectrum of isospin-zero states as well as qqg hybrids. The existence of this exotic spectrum is as essential a prediction of QCD as the Higgs particle is for the electroweak theory.Lattice gauge theory predicts the spectrum and quantum numbers of gluonic states. According to a recent calculation [1], the ground-state masses for the J P C = 0 ++ and 2 ++ glueballs G J are 1.73 and 2.40 GeV, respectively.Thus far, the empirical evidence for glueballs is not decisive, probably because of complications from mixing with the quark degrees of freedom, but there are indications of an extra neutral scalar state perhaps due to a glueball of mass (before mixing) near 1.7 GeV [2].An important mechanism for producing glueballs is the radiative decay of heavy quarkonium, particularly J/ψ → γG J and Υ → γG J [3]. In these reactions, the quarkonium decays to an intermediate γgg state which then can couple to any charge conjugation parity C = + isospin I = 0 gluonic or hybrid state. For example, the BES Collaboration [4] has observed the radiative decays of the J/ψ and the ψ(2S) to γf 0 (1710), a glueball candidate. In this Letter we focus on another optimal mechanism for the production of G 0 and G 2 at e + e − colliders, the reaction e + e − → γ * → HG J , H = J/ψ or Υ [5], in which a C = + glueball can be produced in association with a quarkonium state from the subprocess γ * → (QQ)(gg). Two-gluon components in η particles have been estimated recently [6]. One of the six Feynman diagrams for the subprocess is shown in Fig. 1; the remaining diagrams are permutations of the photon and the two gluons. A related reaction γbeen considered [7] as a source of pseudoscalar glueballs. We shall show that these reactions satisfy perturbative QCD (pQCD) factorization. Unlike radiative quarkonium decay, this channel imposes no a priori limit on the mass of the glueball. The main background to charmonium-glueball production e + ...

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Problems of double-charm production in e+e− annihilation at s=10.6 GeV

Cited by 202 publications

References 18 publications

The leading twist light-cone distribution amplitudes for the S-wave and P-wave quarkonia and their applications in single quarkonium exclusive productions

The leading twist light-cone distribution amplitudes for the S-wave and P-wave quarkonia and their applications in single quarkonium exclusive productions

Exclusive double charmonium production fromΥdecay

Hunting for Glueballs in Electron-Positron Annihilation

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