Exotic and excited-state radiative transitions in charmonium from lattice QCD - High Energy Physics - PhenomenologyReportar como inadecuado




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Abstract: We compute, for the first time using lattice QCD methods, radiativetransition rates involving excited charmonium states, states of high spin andexotics. Utilizing a large basis of interpolating fields we are able to projectout various excited state contributions to three-point correlators computed onquenched anisotropic lattices. In the first lattice QCD calculation of theexotic 1-+ eta c1 radiative decay, we find a large partial width Gammaeta c1-> J-psi gamma ~ 100 keV. We find clear signals for electric dipole andmagnetic quadrupole transition form factors in chi c2 -> J-psi gamma,calculated for the first time in this framework, and study transitionsinvolving excited psi and chi c1,2 states. We calculate hindered magneticdipole transition widths without the sensitivity to assumptions made in modelstudies and find statistically significant signals, including a non-exoticvector hybrid candidate Y hyb? -> eta c gamma. As well as comparison toexperimental data, we discuss in some detail the phenomenology suggested by ourresults and the extent to which it mirrors that of quark potential models andmake suggestions for the interpretation of our results involving exotic quantumnumbered states.



Autor: Jozef Dudek, Robert Edwards, Christopher Thomas

Fuente: https://arxiv.org/



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