arXiv subjects

Hui-Shi Dong

Publications and source records attributed to Hui-Shi Dong.

3 recordsLinked to original sources

arXiv1999

Inelastic $J/ψ$ production in polarized photon-hadron collisions

Presented here is a calculation of inelastic $J/ψ$ production in polarized photon-hadron collisions under the framework of NRQCD factorization formalism. We consider the photoproduction of $\jpsi$ in the energy range relevant to HERA. The Weizsäcker-Williams approximation is adopted in the evaluation of the cross sections for $ep$ collisions. We found that this process can give another independent test for the color-octet mechanism, and the different features for the two color-octet processes may provide further informations on the mechanism for inelastic $\jpsi$ photoproduction. And the discrepancy on the production asymmetry $A$ between various sets of polarized gluon distribution functions is also found to be distinctive.

hep-ph↗

arXiv1998

Possible Explanation Why τ_{B^{\pm}}\simτ_{B^0} But τ_{D^{\pm}}\sim τ_{D^0}

Data show that τ_{B^{\pm}}\simτ_{B^0}, but τ_{D^{\pm}}\sim 2τ_{D^0}. The naive interpretation which attributes τ_{D^{\pm}}\sim 2τ_{D^0} to a destructive interference between two quark diagrams for D^{\pm} decays, definitely fails in the B-case. We investigate Close and Lipkin's suggestion that the phases for producing radially excited states ψ_{2s} in the decay products of B-mesons can possess an opposite sign to the integrals for ψ_{1s} decay products. Their contributions can partially compensate each other to result in τ_{B^{\pm}}\simτ_{B^0}. Since D-mesons are much lighter than B-mesons, such possibilities do not exist in D-decays.

hep-ph↗

arXiv1997

New Types of Accessible Environmental Influence on Neutrino Oscillation

To describe possible effects of medium, besides the hamiltonian introduced by Mikheev, Smirnov and Wolfenstein (MSW), in principle, there may exist new terms in the evolution equation for the neutrino oscillation due to the environment. Considering a two-energy-level quantum system: $ν_1-ν_2$, two-species neutrino system which is embedded in a matter environment, we solve the neutrino evolution equation precisely with the possible extra terms, especially, those cause alternations between pure and mixed states of the neutrino quantum system. We obtain some remarkable features for the neutrino oscillations, which are different from that of MSW and accessible to be observed in solar neutrino observation and/or in the planned long-baseline neutrino experiments.

hep-ph↗