Wan-Li Ju

EM Decay of X(3872) as the

The recent BaBar results raise the possibility that X(3872) has negative parity; reassigning it to the state should therefore be considered. In this paper we give a general form of the wave function of 2−+ mesons. By solving the instantaneous Bethe–Salpeter equation, we get the mass spectrum and corresponding wave functions. We calculate the electromagnetic decay widths of the first 2−+ state which we assume to be the X(3872) particle. The results are Γ(2−+(3872) → J/ψγ) = 1.59+0.53−0.42 keV, Γ(2−+(3872) → ψ(2S)γ) = 2.87+1.46−0.97 eV and Γ(2−+(3872) → ψ(3770)γ) = 0.135+0.066−0.047 keV. The ratio of the branch fractions of the second and the first channels is about 0.002, which is inconsistent with the experimental value 3.4 ± 1.4. Therefore X(3872) is unlikely to be a 2−+ charmonium state. In addition, we obtain a relatively large decay width for the 2−+(3872) → hcγ channel, 392+62−111 keV.

1{^1D_2}(2^{-+})

A bstractNeutrinoless hadron Lepton Number Violating (LNV) decays can be induced by virtual Majorana neutrino, which in turn indubitably show the Majorana nature of neutrinos. Many three-body LNV processes and Lepton Flavour Violating (LFV) processes have been studied extensively in theory and by experiment. As a supplement, we here study 75 four-body LNV (LFV) processes from heavy pseudoscalar B and D decays. Most of these processes have not been studied in theory and searched for in experiment, while they may have sizable decay rates. Since the four-body decay modes have the same vertexes and mixing parameters with three-body cases, so their branching fractions are comparable with the corresponding three-body decays. We calculate their decay widths and branching fractions with current bounds on heavy Majorana neutrino mixing parameters, and estimate some channels’ reconstruction events using the current experimental data from Belle.

charmonium

The recent BaBar results raise the possibility that X(3872) has negative parity; reassigning it to the state should therefore be considered. In this paper we give a general form of the wave function of 2−+ mesons. By solving the instantaneous Bethe–Salpeter equation, we get the mass spectrum and corresponding wave functions. We calculate the electromagnetic decay widths of the first 2−+ state which we assume to be the X(3872) particle. The results are Γ(2−+(3872) → J/ψγ) = 1.59+0.53−0.42 keV, Γ(2−+(3872) → ψ(2S)γ) = 2.87+1.46−0.97 eV and Γ(2−+(3872) → ψ(3770)γ) = 0.135+0.066−0.047 keV. The ratio of the branch fractions of the second and the first channels is about 0.002, which is inconsistent with the experimental value 3.4 ± 1.4. Therefore X(3872) is unlikely to be a 2−+ charmonium state. In addition, we obtain a relatively large decay width for the 2−+(3872) → hcγ channel, 392+62−111 keV.

Lepton-number violating four-body decays of heavy mesons

A bstractThe new particle Z(3930) found by the Belle and BaBar Collaborations through the

Electromagnetic decay of X(3872) as the 11D2(2?+) charmonium

\gamma \gamma \to D\overline{D}

Two-body strong decay of Z(3930) as the χc2(2P) state

process is identified to be the χc2(2P) state. Since the mass of this particle is above the

Annihilation rate of 2−+ charmonium and bottomonium

D{{\overline{D}}^{{\left( * \right)}}}

WHY X(3915) IS SO NARROW AS A χc0(2P) STATE

threshold, the OZI-allowed two-body strong decays are the main decay modes. In this paper, these strong decay modes are studied with two methods. One is the instantaneous Bethe-Salpeter method within Mandelstam formalism. The other is the combination of the 3P0 model and the former formalism. The total decay widths are 26.3 MeV and 27.3 MeV for the methods with or without the 3P0 vertex, respectively. The ratio of

The rare semi-leptonic B c decays involving orbitally excited final mesons

{\varGamma_{{D\overline{D}}}}

NONLEPTONIC PRODUCTION OF CHARMED P-WAVE MESONS FROM (B)over-bar(s)(0) AND (B)over-bar(0) DECAYS

over