科研之友
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摘要
The angular distributions of the decay products in the successive decays chi(c)(chi(b)) -> J/psi(Y)gamma and J/psi(Y) -> l(+)l(-) are calculated as a function of the angular momentum composition of the decaying chi meson and of the multipole structure of the photon radiation, using a formalism independent of production mechanisms and polarization frames. The polarizations of the chi states produced in high-energy collisions can be derived from the dilepton decay distributions of the daughter J/psi or Y mesons, with a reduced dependence on the details of the photon reconstruction or simulation. Moreover, this method eliminates the dependence of the polarization measurement on the actual details of the multipole structure of the radiative transition.
- 出版日期2011-5-3
