Strong decays of higher excited heavy-light mesons in a chiral quark model

Abstract

The strong decay properties of the higher excited heavy-light mesons from the first radially excited states up to the first F-wave states are studied in a constituent quark model. It is found that many missing excitations have good potentials to be found in future experiments for their narrow widths, and some of them dominantly decay into the first orbital excitations rather than into ground states. In future observations, one should focus on the decay processes not only into the ground states, but also into the low-lying P-wave excitations with J P ¼ 0 þ ; 1 þ . Furthermore, the nature of the newly observed states D J ð3000Þ, D Ã J ð3000Þ, and Bð5970Þ is discussed. It is predicted that D J ð3000Þ seems to be a partner of D sJ ð3040Þ, which could be identified as the low-mass mixed state j2P 1 i L (J P ¼ 1 þ ) via the 2 1 P 1 -2 3 P 1 mixing. The D Ã J ð3000Þ resonance seems to favor the 1 3 F 4 state; while the quantum numbers J P ¼ 0 þ and 2 þ cannot be excluded complectly, more experimental observations are needed to determine its J P values. The Bð5970Þ resonance is most likely to be the 1 3 D 3 with J P ¼ 3 − . PHYSICAL REVIEW D 90, 074029 (2014) 074029-2 LI-YE XIAO AND XIAN-HUI ZHONG PHYSICAL REVIEW D 90, 074029 (2014) 074029-4 STRONG DECAYS OF HIGHER EXCITED HEAVY-LIGHT … PHYSICAL REVIEW D 90, 074029 (2014) 074029-9

Possible interpretation of the newly observed Ω(2012) state

“…In present work we will attempt to understand the inner structure of this newly observed state Ωð2012Þ by analyzing the strong decay properties of its possible candidates within a chiral quark model, so that our theoretical widths can be compared with the measured width directly. The chiral quark model [24] is developed and successfully used to study the Okubo-Zweig-Iizuka (OZI) allowed two-body strong decays of the heavy-light mesons [25][26][27][28] and baryons [29][30][31][32][33][34][35][36]. In this framework, the spatial wave functions of heavy baryons are described by harmonic oscillators, and an effective chiral Lagrangian is then introduced to account for the quark-meson coupling at the baryon-meson interaction vertex.…”

Strong decays of $$D_{3}^{*}(2760)$$ D 3 ∗ ( 2760 ) , $$D_{s3}^{*}(2860)$$ D s 3 ∗ ( 2860 ) , $$B_{3}^{*}$$ B 3 ∗ , and $$B_{s3}^{*}$$ B s 3 ∗

“…There the experimental value is used to deduce the effective coupling which is applied to calculate the partial decay widths, the first two of which are about 3 times as large as ours. Reference [27] gets the total decay width of 60 MeV, which is twice larger than ours. When M is taken to be 6105 MeV, our results increase by about two times, which is about 2 and 4 times of those in Ref.…”

“…[39], where 3 P 0 model is applied. Reference [27] uses the chiral quark model. One can see a result about twice of ours is obtained when M takes the same value.…”

“…Beside that, those decays are also applied to determine the quantum number of particles. To study these decays, several theoretical methods could be applied, such as the chiral quark method [9,[27][28][29][30], the heavy meson effective theory [5,14,26,31], the QCD sum rules [15,16], and the 3 P 0 method [10,12,18,25,[32][33][34][35][36][37][38][39][40]. The chiral quark model introduces an effective Lagrangian to describe the coupling between light quark fields and light meson, while for the heavy meson effective theory, the interaction lagrangian is constructed just by meson fields.…”

Strong decays of DJ(3000) and DsJ(3040)<

“…In addition, in Ref. [46], the partial and total decay widths as functions of the mass and the mixing angle were given. With a mixing TABLE IV.…”