Search

B→χc1(1P,2P)K decays are studied in QCD factorization by treating charmonia as nonrelativistic bound states. No infrared divergences exist in the vertex corrections, while the logarithmic end-point singularities in the hard spectator corrections can be regularized by a momentum cutoff. Within certain uncertainties, we find that the B→χc1(2P)K decay rate can be comparable to B→χc1(1P)K and get Br(B0→χc1′K0)=Br(B+→χc1′K+)≈(2-4)×10-4. This might imply a possible interpretation for the newly discovered X(3872): that this state has a dominant JPC=1++(2P) cc̅ component, but it is mixed with a substantial D0D̅*0+D*0D̅0 component. [ABSTRACT FROM AUTHOR]

In this paper, we propose a new approach to probe the quarkonium at the BES-III and the B factories. In the two-photon process, e+e- → e+e- + hadron, the signals of the emitted hadron can be reconstructed through investigating the final leptons e+ e-. Furthermore, by analyzing the distribution of the relative angle between the final e+ and e-, we can determine the quantum number of the final hadron. For those hadrons that are hard to detect directly, this may provide an effective way. We calculate the cross sections as well as the distributions of the ηc(1S, 2S) and Xcj(lP 2P) production at tree level and the next-to-leading order QCD radiative corrections. In addition, the cross sections of bottomonium production are considered at tree level. Unfortunately, they are too tiny to be detected. [ABSTRACT FROM AUTHOR]

We study the γ exclusive decay into double charmonium, specifically, the S-wave charmonium J/Ψ plus the P-wave charmonium Χc0,1,2 in the nonrelativistic QCD factorization framework. Three distinct decay mechanisms, i.e., the strong, electromagnetic, and radiative decay channels, are included, and their interference effects are investigated. The decay processes Y(1S, 2S, 3S) → J/Ψ + Χc,1,0 are predicted to have the branching fractions of order 10-6, which should be observed in the prospective Super B factory. [ABSTRACT FROM AUTHOR]