Direct CP violation in hadronic B decays

There are different approaches for the hadronic B decay calculations, recently. In this paper, we upgrade three of them, namely factorization, QCD factorization and the perturbative QCD approach based on kT factorization, using new parameters and full wave functions. Although they get similar results for many of the branching ratios, the direct CP asymmetries predicted by them are different, which can be tested by recent experimental measurements of B factories.

Study on the mechanism of open-f lavor strong decays

Open-flavor strong decays are studied based on the interaction of a potential quark model. The decay process is related to the s-channel contribution of the same scalar confinement and one-gluon-exchange （OGE） interaction in the quark model. After we adopt the prescription of massive gluons in a time-like region from the lattice calculation, the approximation of four-fermion interaction is applied. The numerical calculation is performed to the meson decays in u, d and s light flavor sectors. The analysis of the DIS ratios of b1 →ωπ and a1 → ρπ shows that the scalar interaction should be dominant in the open-flavor decays.

Investigations on the charmless decays of Y(4260)

Apart from the charmful decay channels of Y（4260）, the charmless decay channels of Y（4260） also provide us a good platform to study the nature and the decay mechanism of Y（4260）. In this paper, we propose to probe the structure of Y（4260） through the charmless decays Y（4260）→VP via intermediate D1D＋c.c. meson loops, where V and P stand for light vector and pseudoscalar mesons, respectively. Under the molecule ansatz of Y（4260）, the predicted total branching ratio BRVP for all Y（4260） → VP processes are about（0.34＋0.32-0.23）% to（0.75＋0.72-0.52）% with the cutoff parameter α=2–3. Numerical results show that the intermediate D1D＋c.c. meson loops may be a possible transition mechanism in the Y（4260） → VP decays. These predicted branching ratios are the same order to that of Y（4260）→Z＋c（3900）π-, which may be an evidence of D1 D molecule and can be examined by the forthcoming BESdata in the near future.

Experimental review of the T(1S,2S,3S)physics at e^(+)e^(-) colliders and the LHC

The three lowest-lying r states,ie,r(1S),T(2S),and r(35),composed of b pairs and below the BB threshold,provide a good platform for the researches of hadronic physics and physics beyond the Standard Model.They can be produced directly in ete--colliding experiments,such as CLEO,Babar,and Belle,with low continuum backgrounds.In these experiments,many measurements of the exclusive r(1S)and r(2S)decays into light hadrons,which shed light on the"80%rule"for the Okubo-Zweig-lizuka suppressed decays in the bottomonium sector,were carried out.Meanwhile,many studies of the charmonium and bottomonium productions in r(1S,2S,3S)decays were performed,to distinguish different Quantum Chromodynamics(QCD)models.Besides,exotic states and new physics were also extensively explored in r(1S,2S,3S)decays at CLEO,BaBar,and Bell.The r(1S,2S,3S)states can also be produced in p collisions and in ollisions involving heavy ions.The precision measurements of their cross sections and polarizations at the large hadron collider(LHC),especially in the CMS,ATLAS,and LHCb experiments,help to understand r production mechanisms in Pp collisions.The observation of the sequential r suppession in heavy ion collisions at CMS,LHCb,and ALICE is of great importance for verifying the quark-gluon plasma predicted by QCD.In this article,we review the experimental results on T(1S,2S,3S)at e+e-colliders and the LHC,and summarize their prospects at Belle II and the LHC.

Study of radially excited Ds(2^1S0)and Ds(3P)

The unobserved J^P= 0^-radial excitation Ds（2^1S0） is anticipated to have mass 2650 Me V（denoted as Ds（2650））. Study of hadronic production is an important way to identify highly excited states. We study hadronic production of Ds（2650） from higher excited resonances in a3P0 model. Relevant hadronic partial decay widths are found to be very small, which implies it is difficult to observe Ds（2650） in hadronic decays of higher excited resonances. Hadronic decay widths of radially excited Ds（3P） have also been estimated. The total decay widths of four Ds（3P） are large, but the branching ratios in the Ds（2650）η channel are very small, which implies that it seems impossible to observe Ds（2650） in hadronic decays of Ds（3P）. The dominant decay channels of the four Ds（3P） have been pointed out, and D1（2420）, D1（2430）, D＊2（2460）, D（2550）, D（2600）,（1-1D2）D（2750） and D3^（2760） are possible to observe in hadronic production from Ds（3P）.