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13 papers · 2 filters
Two-loop gluino contributions to neutron electric dipole moment in CP violating MSSM
Tai-Fu Feng, Xue-Qian Li, Jukka Maalampi +1
We analyze two-loop gluino corrections to the neutron electric dipole moment (EDM) in the minimal supersymmetry extension of the standard model (MSSM). The dependence of two-loop c…
Berry Phase in Neutrino Oscillations
Xiao-Gang He, Xue-Qian Li, Bruce H. J. McKellar +1
We study the Berry phase in neutrino oscillations for both Dirac and Majorana neutrinos. In order to have a Berry phase, the neutrino oscillations must occur in a varying medium, t…
Photoproduction and Radiative Decay of Spin 1/2 and 3/2 Pentaquarks
Xiao-Gang He, Tong Li, Xue-Qian Li +1
We study photoproduction and radiative decays of pentauqarks paying particular attention to the differences between spin-1/2 and spin-3/2, positive and negative parities of pentaqu…
A Comprehensive Four-Quark Interpretation of D_s(2317), D_s(2457) and D_s(2632)
Yu-Qi Chen, Xue-Qian Li
The recently observed new member of the charm-strange family D_s(2632) which has a surprisingly narrow width is challenging our theory. D_s(2317) and D_s(2457) which were observed…
Parity, Charge Conjugation and SU(3) Constraints on Threshold Enhancement in decays into and
Xiao-Gang He, Xue-Qian Li, J. P. Ma
We study the threshold enhancement effects of baryon-anti-baryon systems in decays at BES using parity , charge conjugation , and flavor SU(3) symmetries. The and $…
Instantaneous Bethe-Salpeter Equation and Its Exact Solution
Chao-Hsi Chang, Jiao-Kai Chen, Xue-Qian Li +1
We present an approach to solve a Bethe-Salpeter (BS) equation exactly without any approximation if the kernel of the BS equation exactly is instantaneous, and take positronium as…