Decay width and coupling constants of charm and bottom mesons

XXII DAE High Energy Physics Symposium, 2018

The European Physical Journal A, 2021

2 (3000) 0 resonance states are analyzed in the heavy quark mass limit of Heavy Quark Effective Theory (HQET). The individual decay rates and the branching ratios among the strong decays determine their spin and parity. From such states the Regge trajectories are constructed in (J, M 2) and (nr, M 2) planes and further predict the masses of higher excited states (

Analysis of strong decays of charmed mesons D * 2 (2460), D 0 (2560), D 2 (2740), D 1 (3000), D * 2 (3000) and their spin partners D * 1 (2680), D * 3 (2760) and D * 0 (3000).

Physical Review D, 1995

A previous analysis of two-body Cabibbo allowed nonleptonic decays of D 0 mesons and of Cabibbo allowed and rst-forbidden decays of D + and D + s has been adjourned using more recent experimental data and extended to the Cabibbo forbidden decays of D 0. Annihilation and W-exchange contributions as well as nal state interaction eects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental data, which show large avour SU(3) violations. New tting parameters are necessary to describe rescattering eects for Cabibbo forbidden D 0 decays, given the lack of experimental informations on isoscalar resonances. We k eep their number to a minimum-three-using phenomenologically based considerations. We also discuss CP violating asymmetries. partially supported by the European Community under the Human Capital and Mobility Programme, contract CHRX-CT93-0132. 1 This paper replaces the previous one with the same title submitted to the ICHEP94 conference (ref. gls0658), also circulated as ROMA preprint n.1026-1994 / NAPOLI DSF-T-18/94. The 1994 edition of the Particle Data (Phys. Rev. D 50 (August 1994) part I) did in fact show noticeable changes in the experimental branching ratios for D decays. We therefore made a new analysis, that we report here.

Physical Review D, 2015

Inspired by the present experimental status of charmed-strange mesons, we perform a systematic study of the charmed-strange meson family, in which we calculate the mass spectra of the charmed-strange meson family by taking a screening effect into account in the Godfrey-Isgur model and investigate the corresponding strong decays via the quark pair creation model. These phenomenological analyses of charmed-strange mesons not only shed light on the features of the observed charmed-strange states, but also provide important information on future experimental search for the missing higher radial and orbital excitations in the charmed-strange meson family, which will be valuable task in LHCb, forthcoming BelleII and PANDA.

Physical Review Letters, 2009

Physical Review D, 1998

PHYSICAL REVIEW D, 2019

We calculate the spectrum of B c mesons using a nonrelativistic quark potential model. Using the calculated wave functions, we compute the radiative widths of B c excited states. The strong decay widths are calculated in a modified 3 P 0 model, assuming harmonic oscillator wave functions. The hadronic transition rates of B c mesons are calculated using the Kuang-Yan approach. These results are used to determine branching ratios of possible decay channels of several B c excited states. Calculated branching ratios are then combined with production cross section of B c states at the LHC to suggest strategies to find missing excited states of B c mesons.

The European Physical Journal A

The strong decay amplitudes and radiative partial widths of orbital and radially excited states of B and B s mesons are presented. These results are obtained with a nonrelativistic potential quark model, the nonrelativistic reduction of the electromagnetic transition operator, and the " 3 P 0 " model of strong decays. The predictions are compared to experiment where possible and assignments for the recently discovered states, B 1 (5721), B * 2 (5747), B J (5840), B J (5970), B s1 (5830), and B * s2 (5840), are made.

Physical Review D, 2010

We study in this work the two-body hadronic charmed meson decays, including both the P P and V P modes. The latest experimental data are first analyzed in the diagrammatic approach. The magnitudes and strong phases of the flavor amplitudes are extracted from the Cabibbo-favored (CF) decay modes using χ 2 minimization. The best-fitted values are then used to predict the branching fractions of the singly-Cabibbo-suppressed (SCS) and doubly-Cabibbo-suppressed decay modes in the flavor SU(3) symmetry limit. We observe significant SU(3) breaking effects in some of SCS channels. In the case of V P modes, we point out that the A P and A V amplitudes cannot be completely determined based on currently available data. We conjecture that the quoted experimental results for both D + s →K 0 K * + and D + s → ρ + η ′ are overestimated. We compare the sizes of color-allowed and color-suppressed tree amplitudes extracted from the diagrammatical approach with the effective parameters a 1 and a 2 defined in the factorization approach. The ratio |a 2 /a 1 | is more or less universal among the D →Kπ,K * π andKρ modes. This feature allows us to discriminate between different solutions of topological amplitudes. For the long-standing puzzle about the ratio Γ(D 0 → K + K −)/Γ(D 0 → π + π −), we argue that, in addition to the SU(3) breaking effect in the spectator amplitudes, the long-distance resonant contribution through the nearby resonance f 0 (1710) can naturally explain why D 0 decays more copiously to K + K − than π + π − through the W-exchange topology. This has to do with the dominance of the scalar glueball content of f 0 (1710) and the chiral-suppression effect in the decay of a scalar glueball into two pseudoscalar mesons. The same FSI also explains the occurrence of D 0 → K 0K 0 and its vanishing amplitude when SU(3) flavor symmetry is exact. Owing to the G-parity selection rule, D + s → π + ω does not receive contributions from the short-distance W-annihilation and resonant FSIs, but it can proceed through the weak decays D + s → ρ + η (′) followed by the final-state rescattering of ρ + η (′) into π + ω through quark exchange.