Effect of charmed meson loops on charmonium transitions

Guo, Feng-Kun; Hanhart, C.; Li, Gang; Meißner, Ulf‐G.; Zhao, Q.

doi:10.1103/physrevd.83.034013

Cited by 131 publications

(146 citation statements)

References 129 publications

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“…Such a splitting was also much smaller than the corresponding splitting of m χ b2 −m χ b0 [1]. These puzzles still challenge the P-wave charmonium assignments of the Z(3930) and X(3915) [621,814,58].…”

Section: Y(4630)mentioning

confidence: 87%

“…[621], Guo et al doubted the χ c0 assignment of the X(3915). The OZI-allowed open-charm decay X(3915) → DD generally has a larger width than that of the X(3915).…”

Section: X(3915)mentioning

confidence: 99%

“…Since the X(3872) is very close to the D * 0D0 threshold, the rescattering effects of the D and D * mesons were studied in Refs. [618,619,620,621,622], and the influence of thresholds was studied in Ref. [623].…”

Section: Lattice Qcdmentioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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Section: Y(4630)mentioning

confidence: 87%

“…[621], Guo et al doubted the χ c0 assignment of the X(3915). The OZI-allowed open-charm decay X(3915) → DD generally has a larger width than that of the X(3915).…”

Section: X(3915)mentioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…This is because both the Y (4260)D 1D and the h c D * D vertices are S-wave, and in this case there is a large enhancement factor 1/v 3 with v ≪ 1 being the velocity of the intermediate charmed mesons (for detailed discussions, we refer to Refs. [13,23,24]). In the hadro-charmonium picture, Li and Voloshin explain the decays of the Y (4260) into both the π + π − J/ψ and π + π − h c channels by mixing two hadro-charmonium states whose cores are a 1 P 1 and 3 S 1 charmonium, respectively, into the Y (4260) and Y (4360) [18].…”

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confidence: 99%

Y(4260): Hadronic molecule versus hadro-charmonium interpretation

et al. 2014

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In this paper we confront both the hadronic molecule and the hadro-charmonium interpretations of the Y (4260) with the experimental data currently available. We conclude that the data support the Y (4260) being dominantly a D1D + c.c. hadronic molecule while they challenge the hadrocharmonium interpretation. However, additional data is necessary to allow for stronger conclusions. The Z c (3900) was soon confirmed by the Belle Collaboration [6] and an analysis based on the CLEO-c data [7].In Ref.[8], it was argued that the strong signal of Z c (3900), being a DD * + c.c. molecular state [8][9][10], in the Y (4260) decays can be explained by a dominant D 1 D molecular component in the Y (4260) wave function [11,12] 1 . Related discussions can also be found in Refs. [13,14] emphasizing different aspects.Recently, the interpretation of the Y (4260) as a D 1 D molecular state was challenged in Ref. [15], where it is suggested that the Y (4260) is hadro-charmonium state (a compact quarkonium surounded by light quarks) [16,17]. The argument is based on the fact that the production of a pair of S P L = (1/2) − and S P L = (3/2) + heavy mesons, where S L is the sum of the spin of the light quark and the orbital angular momentum in the heavy meson, in electron-positron collisions is forbidden in the heavy quark limit-in the real world this should translate to a suppressed production of both the D 1 D continuum as well as D 1 D molecular states.In this paper we confront both interpretations of the Y (4260) the hadro-charmonium as well as the hadronic molecule with the data currently available. Especially, we argue that the D 1 D molecular interpretation of the Y (4260) does not contradict the current experimental facts despite the suppression of the production of the D andD 1 pair. It is shown that the heavy quark spin symmetry (HQSS) breaking due to a finite charm quark mass is important in this case [18]. We also discuss the challenges that both interpretations still face. In Ref.[15], Li and Voloshin stressed that in the heavy quark limit the production of a heavy state in e + e − -collisions proceeds via the electromagnetic currentcγ µ c leading to a cc pair in a 3 S 1 state with the spin of the heavy system S H = 1. At the same time the total angular momentum of the light degrees of freedom should be S L = 0. In the heavy quark limit both S H and S L are conserved. However, the light quark total angular momenta in the S-wave states D 1 D ( * ) and D 2 D * , S L = 3/2 and S L = 1/2, can not combine to S L = 0. Consequently, the S-wave production of D 1 D ( * ) and D 2 D * pairs with J P C = 1 −− in electron-positron collisions breaks the HQSS and thus would be forbidden, if the charm quark were infinitely heavy.This can also be understood using the angular momentum decomposition of the heavy and light degrees of freedom. The J P C = 1 −− states with (

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“…This result actually sets up a limit for the η-π 0 mixing contributions in ψ(3770) → J/ψ + π 0 . In contrast, the Particle Data Group (PDG2010) [15] gives an experimental upper limit BR(ψ(3770 [19,20] based on a nonrelativistic effective field theory (NREFT) suggests that the strong-isospin violation via the IML is relatively enhanced by 1/v in comparison with the tree-level contribution where the pion is emitted directly from the charmonium through soft gluon exchanges, where v ≃ 0.5 is the velocity of the intermediate charmed meson. Since ψ(3770) is close to the DD threshold, we expect that such a strong-isospin mechanism would also play a role.…”

Section: Introductionmentioning

confidence: 99%

Isospin violating decay ofψ(3770)→J/ψ+π0

et al. 2012

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The strong-isospin violation in ψ(3770) → J/ψ+π 0 via intermediate D meson loops is investigated in an effective Lagrangian approach. In this process, there is only one D-meson loop contributing to the absorptive part, and the uncertainties due to the introduction of form factors can be minimized. With the help of QCD spectral sum rules (QSSR), we extract the J/ψDD * form factor as an implement from the first principle of QCD. The DD * π 0 form factor can be well determined from the experimental data for D → πlν. The exploration of the dispersion relation suggests the dominance of the dispersive part via the intermediate D meson loops even below the open charm threshold. This investigation could provide further insights into the puzzling question on the mechanisms for ψ(3770) → non-DD transitions.

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Effect of charmed meson loops on charmonium transitions

Cited by 131 publications

References 129 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Y(4260): Hadronic molecule versus hadro-charmonium interpretation

Isospin violating decay ofψ(3770)→J/ψ+π0

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