Radiative transitions and magnetic moments of the charmed and bottom vector mesons in chiral perturbation theory

Wang, Bo; Yang, Bin; Meng, L.; Zhu, Shi-Lin

doi:10.1103/physrevd.100.016019

Cited by 28 publications

(30 citation statements)

References 61 publications

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“…In other words, the heavy quark symmetry breaking effect at the loop level is very significant for the charm sectors. This effect has been noticed by some previous works [13,52]. Additionally, we give the contributions of each O(p 3 ) loop diagram in Table II.…”

Section: Numerical Resultssupporting

confidence: 74%

Isospin violating decay Ds*→Dsπ0 i

et al. 2020

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We systematically calculate the isospin violating decay, D * s → Dsπ 0 , with the heavy meson chiral perturbation theory up to O(p 3 ) including the loop diagrams. The O(p 3 ) tree level amplitudes contain four undetermined LECs. We use two strategies to estimate them. With the nonanalytic dominance approximation, we get Γ[D * s → Dsπ 0 ] = (3.38 ± 0.12) eV. With the naturalness assumption, we give a possible range of the isospin violating decay width, [1.11 − 6.88] eV. We find that the contribution of the O(p 3 ) corrections might be significant.

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Section: Numerical Resultssupporting

confidence: 74%

Isospin violating decay Ds*→Dsπ0 i

et al. 2020

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“…(2.8) and (2.12), i.e., the mass splitting δ is treated as another small scale in the Lagrangians. This expansion works well for the systems with one heavy matter field [43]. The loop integrals in these systems are the polynomials of δ, thus the convergence of the chiral expansion is not affected as long as the δ ∼ m π or smaller than m π .…”

Section: Hidden-bottom Molecular Pentaquarksmentioning

confidence: 85%

“…In particular, the mass difference δ betweenD * andD is larger than the pion mass m π . The heavy quark spin symmetry breaking effect has been noticed for the charmed sectors in some works [11,43]. Besides, one shall not neglect the role of Λ c , since the Λ c π couples strongly with the Σ ( * ) c .…”

Section: Introductionmentioning

confidence: 98%

Hidden-charm and hidden-bottom molecular pentaquarks in chiral effective field theory

Wang

Meng

Zhu

2019

J. High Energ. Phys.

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The newly observed P c (4312), P c (4440) and P c (4457) at the LHCb experiment are very close to the Σ cD and Σ cD * thresholds. In this work, we perform a systematic study and give a complete picture on the interactions between the Σ ( * ) c andD ( * ) systems in the framework of heavy hadron chiral perturbation theory, where the short-range contact interaction, long-range one-pion-exchange contribution, and intermediate-range two-pion-exchange loop diagrams are all considered. We first investigate the three P c states without and with considering the Λ c contribution in the loop diagrams. It is difficult to simultaneously reproduce the three P c s unless the Λ c is included. The coupling between the Σ ( * ) cD ( * ) and Λ cD ( * ) channels is crucial for the formation of these P c s. Our calculation supports the P c (4312), P c (4440) and P c (4457) to be the S-wave hidden-charm [Σ cD ] I=1/2 J=1/2 , [Σ cD * ] I=1/2 J=1/2 and [Σ cD * ] I=1/2 J=3/2 molecular pentaquarks, respectively. Our calculation disfavors the spin assignment J P = 1 2 − for P c (4457) and J P = 3 2 − for P c (4440), because the excessively enhanced spin-spin interaction is unreasonable in the present case. We obtain the complete mass spectra of the [Σ ( * ) cD ( * ) ] J systems with the fixed low energy constants. Our result indicates the existence of the [Σ *cD * ] J (J = 1 2 , 3 2 , 5 2 ) hadronic molecules. The previously reported P c (4380) might be a deeper bound one. Additionally, we also study the hidden-bottom Σ ( * ) b B ( * ) systems, and predict seven bound molecular states, which could serve as a guidance for future experiments. Furthermore, we also examine the heavy quark symmetry breaking effect in the hidden-charm and hidden-bottom systems by taking into account the mass splittings in the propagators of the intermediate states. As expected, the heavy quark symmetry in the bottom cases is better than that in the charmed sectors. We notice that the heavy quark symmetry in the Σ cD and Σ * cD systems is much worse for some fortuitous reasons. The heavy quark symmetry breaking effect is nonnegligible in predicting the effective potentials between the charmed hadrons.

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“…Γ D * is the width of D * meson, for D * + , we use the experimental value 83.4 keV, while for D * 0 , we adopt the central value 77.7 keV that calculated in Ref. [44]. f π = 92.4 MeV is the pion decay constant and p 2 stands for the momentum of pion.…”

Section: Strong Decay and Radiative Decaymentioning

confidence: 99%

Probing the long-range structure of the $T_{cc}^+$ with the strong and electromagnetic decays

Meng,

Wang,

Wang

et al. 2021

Preprint

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Very recently, the LHCb Collaboration reported the doubly charmed tetraquark state T + cc blow the D * + D 0 threshold about 273 keV. As a very near-threshold state, its long-distance structure is very important. In the molecular scheme, we investigate the kinetic allowed strong decays T + cc → D 0 D 0 π + , T + cc → D + D 0 π 0 and radiative decays D + D 0 γ, which are sensitive to the long-range structure of T + cc . In a coupled-channel effective field theory, we extract the coupling constants of T + cc to D * 0 D + and D * + D 0 channels from the residuals of the T -matrix. Due to the low-energy universality, the coupling constants only depend on the binding energy. With the coupling constants and the strong and radiation vertices of D * meson from experiments, we give the strong and radiative decay widths of T + cc . Our predictions can be used to test the inner structure of T + cc state.

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Radiative transitions and magnetic moments of the charmed and bottom vector mesons in chiral perturbation theory

Cited by 28 publications

References 61 publications

Isospin violating decay Ds*→Dsπ0 i

Isospin violating decay Ds*→Dsπ0 i

Hidden-charm and hidden-bottom molecular pentaquarks in chiral effective field theory

Probing the long-range structure of the $T_{cc}^+$ with the strong and electromagnetic decays

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