Exclusive decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi></mml:math>-wave bottomonium into double<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>

Zhang, Juan; Dong, Hairong; Feng, Feng

doi:10.1103/physrevd.84.094031

Cited by 15 publications

(17 citation statements)

References 54 publications

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“…The results obtained on the χ bJ decay branching fractions are listed in Table I. Our upper limits are much lower than the central values predicted in the LC formalism [15] and pQCD calculation [16], but are consistent with calculations using the NRQCD factorization approach [13,14]. Here n up is the upper limit on the number of signal events, ε is the sum of the efficiencies from different modes with J/ψ and ψ ′ decay branching fractions and trigger efficiency included, σsys is the total systematic error, and BR is the upper limit on the branching fraction of χ bJ decays, where the values of B(Υ(2S) → γχ bJ ) = (3.8 ± 0.4)%, (6.9 ± 0.4)% and (7.15 ± 0.35)% for J = 0, 1 and 2 are used [24].…”

Section: −11supporting

confidence: 84%

“…[14] considered corrections to all orders in v c in the charmonium rest frame, and found decay partial widths that are about a factor of three larger than those in Ref. [13]. In the light cone (LC) formalism, however, much larger production rates (with uncertainties of 50% to 70%) are obtained in Ref.…”

Section: −11mentioning

confidence: 87%

“…Since no experimental measurements are available for the widths of χ bJ [24], and the theoretical expectations are at 1 MeV level or less [13], the widths of χ bJ are set to be zero. Generic decay modes are used for the J/ψ and ψ ′ .…”

Section: −11mentioning

confidence: 99%

“…The authors of Ref. [13] calculated χ bJ → J/ψJ/ψ in the framework of the NRQCD factorization formalism, including second-order relativistic corrections in the relative charm-quark velocity v c , as well as an electromag-netic correction. The branching fraction is predicted to be of order 10 −5 for χ b0 or χ b2 → J/ψJ/ψ, and 10 −11 for χ b1 → J/ψJ/ψ.…”

mentioning

confidence: 99%

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Search for double charmonium decays of theP-wave spin-triplet bottomonium states

Shen¹,

Yuan²,

Iijima³

et al. 2012

Phys. Rev. D

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Using a sample of 158 million Υ(2S) events collected with the Belle detector, we search for the first time for double charmonium decays of the P -wave spin-triplet bottomonium states (Υ(2S) → γχ bJ , χ bJ → J/ψJ/ψ, J/ψψ ′ , ψ ′ ψ ′ for J = 0, 1, and 2). No significant χ bJ signal is observed in the double charmonium mass spectra, and we obtain the following upper limits, B(χ bJ → J/ψJ/ψ) < 7.1×10 −5 , 2.7 × 10 −5 , 4.5 × 10 −5 , B(χ bJ → J/ψψ ′ ) < 1.2 × 10 −4 , 1.7 × 10 −5 , 4.9 × 10 −5 , B(χ bJ → ψ ′ ψ ′ ) < 3.1×10 −5 , 6.2×10 −5 , 1.6×10 −5 for J = 0, 1, and 2, respectively, at the 90% confidence level. These limits are significantly lower than the central values (with uncertainties of 50% to 70%) predicted using the light cone formalism but are consistent with calculations using the NRQCD factorization approach.

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Section: −11supporting

confidence: 84%

Section: −11mentioning

confidence: 87%

Section: −11mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Search for double charmonium decays of theP-wave spin-triplet bottomonium states

Shen¹,

Yuan²,

Iijima³

et al. 2012

Phys. Rev. D

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show abstract

“…Several theoretical calculations have focused on these processes in perturbative QCD, e.g., η b → J/ψJ/ψ [22][23][24][25] and χ b0,1,2 → J/ψJ/ψ [26][27][28][29]. Experimentally, however, such studies are extremely sparse, apart from the recent searches for several channels of χ bJ into double charmonia for the first time by the Belle Collaboration [30].…”

mentioning

confidence: 99%

Evidence ofϒ(1S)→J/ψ+χc1and sear

et al. 2014

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Using data samples of 102 × 10 6 Υ(1S) and 158 × 10 6 Υ(2S) events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays Υ(1S, 2S) → J/ψ(ψ ′ ) + X, where X = η c , χ cJ (J = 0, 1, 2), η c (2S), X(3940), and X(4160). No significant signal is observed in the spectra of the mass recoiling against the reconstructed J/ψ or ψ ′ except for the evidence of χ c1 production with a significance of 4.6σ for Υ(1S) → J/ψ + χ c1 . The measured branching fraction B(Υ(1S) → J/ψ + χ c1 ) is (3.90 ± 1.21(stat.) ± 0.23(syst.)) × 10 −6 . The 90% confidence level upper limits on the branching fractions of the other modes having a significance of less than 3σ are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach. [4][5][6][7][8][9]. Later the double-charmonium productions of J/ψX(3940) [10,11] and J/ψX(4160) [12] were observed in e + e − annihilation by Belle as well. Numerous theoretical investigations in the following years had attempted to alleviate this disquieting discrepancy, and it is now believed that one can achieve agreement within reasonable uncertainties when both the QCD radiative and relativistic corrections of the order of υ 2 (where υ is the quark relative velocity)are taken into account [13][14][15][16][17][18][19][20][21].Inspired by the unexpectedly high double-charmonium production in e + e − annihilation, interest has turned to the double-charmonium states produced in bottomonium decays. Several theoretical calculations have focused on these processes in perturbative QCD, e.g., η b → J/ψJ/ψ [22][23][24][25] and χ b0,1,2 → J/ψJ/ψ [26][27][28][29]. Experimentally, however, such studies are extremely sparse, apart from the recent searches for several channels of χ bJ into double charmonia for the first time by the Belle Collaboration [30]. The measurements are consistent with NRQCD predictions, though no significant signals are observed; it is reasonable to extend the search for double-charmonium production to the C-odd Υ decays. Compared with the Υ(4S) resonance with its rather broad width, the first three Υ resonances are so narrow that the resonant decay contributions dominate over the continuum ones. This provides a further opportunity to probe the potential properties of double-charmonium production at these Υ peaks.Comprehensive studies of the exclusive decay of Υ into a vector-plus-pseudoscalar charmonium[31], as well as the S-wave charmonium J/ψ plus the P-wave charmonium χ cJ (J = 0, 1, 2) [32] have been performed in the NRQCD factorization approach, where the contributions from the strong, electromagnetic, and radiative channels were considered and the strong decay was taken as dominant. The branching fractions are predicted to be of order 10 −6 for Υ(nS) → J/ψ(ψ ′ ) + η c (η c (2S)) (n = 1, 2, 3) [31]; for Υ → J/ψ + η c , in particular, the predicted branching fraction is consistent with the previous calculation of 1.7 × 10 −6 with only the three-gluon c...

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P-wave quarkonium decays to meson pairs

Chen

Qiao²

2012

J. High Energ. Phys.

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The processes of p-wave Quarkonium exclusive decays to two mesons are investigated, in which the final state vector mesons with various polarizations are considered separately. In the calculation, the initial heavy quarkonia are treated in the framework of non-relativistic quantum chromodynamics, whereas for light mesons, the light cone distribution amplitudes up to twist-3 are employed. It turns out that the higher twist contribution is significant and provides a possible explanation for the observation of the hadron helicity selection rule violated processes χ c1 → φφ, ωω by the BESIII collaboration in recently. We also evaluate the χ b1 → J/ψJ/ψ process and find that its branching ratio is big enough to be measured at the B-factories.

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Exclusive decay ofP-wave bottomonium into doubleJ/ψ

Cited by 15 publications

References 54 publications

Search for double charmonium decays of theP-wave spin-triplet bottomonium states

Search for double charmonium decays of theP-wave spin-triplet bottomonium states

Evidence ofϒ(1S)→J/ψ+χc1and sear

P-wave quarkonium decays to meson pairs

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