119097724
η transitions between charmonia with meson loop contributions
We study the $\ensuremath{\eta}$ transitions between $\ensuremath{\psi}(4040/4160)$ and $J/\ensuremath{\psi}$ by introducing charmed meson loops in an effective Lagrangian approach to enhance the decay amplitudes. The branching fractions $\mathcal{B}[\ensuremath{\psi}(4040)\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\eta}]$ and $\mathcal{B}[\ensuremath{\psi}(4160)\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\eta}]$ estimated in this paper can remarkably explain the experimental measurements of Belle and BESIII within a reasonable parameter range. The ${\ensuremath{\eta}}^{\ensuremath{'}}$ transition between $\ensuremath{\psi}(4160)$ and $J/\ensuremath{\psi}$ is also investigated, and the branching fraction is under the upper limit of CLEO, which can be tested by future experiments.
118457798
New structure around 3250 MeV in the baryonic B decay and the $D^{*}_{0}(2400)N$ molecular hadron
In this work, we first propose the isovector $nD^{*}_{0}(2400)^{0}$ molecular state to explain the enhancement structure around 3250 MeV (Xc(3250)0) in the $\varSigma_{c}^{++}\pi^{-}\pi^{-}$ invariant mass spectrum newly observed by the BaBar Collaboration. Under this molecular state configuration, both the analysis of the mass spectrum and the study of its dominant decay channel can well shed light on its resonance parameters measured by BaBar. Our investigation also shows that the isovector $nD^{*}_{0}(2400)^{0}$ molecular state can decay into $\varSigma_{c}^{++}\pi^{-}\pi^{-}$, which is consistent with experimental observation. These studies provide direct support to the isovector $nD^{*}_{0}(2400)^{0}$ molecular state assignment to Xc(3250)0.
123118487
Electroproduction of Roper Resonance in a Meson Cloud Model
The Q(2) dependencies of Roper resonance (N*(1440)) helicity amplitudes have been discussed based on two assumptions: (i) the Roper resonance is an excitation of one of the three quarks, and (ii) the quarks are surrounded by a pion-meson cloud. Our study shows that the mixing of the ground state in the Roper wavefunction caused by the pion meson cloud together with the pion meson cloud itself is crucial for the predictions of the photoproduction amplitudes of the Roper resonance. It is found that our model can give a good description for the helicity amplitudes of the Roper resonance comparing with the experimental measurement.
118493030
Prediction of isoscalar charmoniumlike structures in the hidden-charm di-eta decays of higher charmonia
Considering the situation that a single chiral particle, η is initially emitted, we study the hidden-charm di-eta decays of the charmoniumlike state and the predicted charmonium , i.e., through the inetermediates and/or , and answer the important question of whether there exist isoscalar charmoniumlike structures in the and/or channels. Our results predict that there will be enhancement structures near , and thresholds for and near , and thresholds for in the distributions of , respectively. These peaks are accessible in future experiments, especially BESIII, Belle, BaBar, and the forthcoming BelleII.
118369333
Higher bottom and bottom-strange mesons
Motivated by the recent observation of the orbital excitation $B(5970)$ by the CDF Collaboration, we have performed a systematic study of the mass spectrum and strong decay patterns of the higher $B$ and ${B}_{s}$ mesons. Hopefully the present investigation may provide valuable clues to further experimental exploration of these intriguing excited heavy mesons.
123485885
Nucleon structure and two-photon exchange
The two-photon exchange corrections is crucial to reconcile the discrepancy of the form factor ratio caused by different measurement techniques. We estimate the two-photon exchange corrections to some electromagnetic observables of electron-nucleon scattering in a light cone quark model. The two-photon exchange corrections to the differential cross section are strongly dependent on the kinematic factor, which is consistent with the results from other model. We further extend the two-photon exchange corrections to time-like region and find the two-photon exchange corrections to differential cross section is very small in low center-of-mass energy region, but the corrections to polarization observables are relative large.
119256430
Remnants, fermions’ tunnelling and effects of quantum gravity
A bstractThe remnants are investigated by fermions’ tunnelling from a 4-dimensional charged dilatonic black hole and a 5-dimensional black string. Based on the generalized uncertainty principle, effects of quantum gravity are taken into account. The quantum numbers of the emitted fermions affects the Hawking temperatures. For the black hole, the quantum gravity correction slows down the increase of the temperature, which leads to the remnant left in the evaporation. For the black string, the existence of the remnant is determined by the quantum gravity correction and effects of the extra compact dimension.