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Production of the spin partner of the X(3872) in e^+e^- collisions
Feng-Kun Guo, Ulf-G. Meißner, Zhi Yang
We study the production of the spin partner of the X(3872), which is a D^{*}\bar D^{*} bound state with quantum numbers J^{PC}=2^{++} and named X_2(4012) here, with the associated…
Could the near-threshold states be simply kinematic effects?
Feng-Kun Guo, Christoph Hanhart, Qian Wang +1
We demonstrate that the spectacular structures discovered recently in various experiments and named as , and states cannot be purely kinematic effects. Their existence n…
What can radiative decays of the X(3872) teach us about its nature?
Feng-Kun Guo, C. Hanhart, Yu. S. Kalashnikova +2
Starting from the hypothesis that the X(3872) is a molecule, we discuss the radiative decays of the X(3872) into and from an effective field theory point o…
Finite-volume corrections to the CP-odd nucleon matrix elements of the electromagnetic current from the QCD vacuum angle
Tarik Akan, Feng-Kun Guo, Ulf-G. Meißner
Nucleon electric dipole moments originating from strong CP-violation are being calculated by several groups using lattice QCD. We revisit the finite volume corrections to the CP-od…
Enhanced breaking of heavy quark spin symmetry
Feng-Kun Guo, Ulf-G. Meißner, Cheng-Ping Shen
Heavy quark spin symmetry is useful to make predictions on ratios of decay or production rates of systems involving heavy quarks. The breaking of spin symmetry is generally of the…
Strong and radiative decays of the and
Martin Cleven, Harald W. Grießhammer, Feng-Kun Guo +2
Since their discovery in 2003, the open charm states and provide a challenge to the conventional quark model. In recent years, theoretical evidence…