Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-24
Phys.Rev.D83:096001,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Submitted to Phys Rev D
Scientific paper
10.1103/PhysRevD.83.096001
The angular distributions of the decay products in the successive decays chi_c (chi_b) to J/psi (Upsilon) gamma and J/psi (Upsilon) to 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 Upsilon 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. Problematic points in previous calculations of the chi_c decay angular distributions are identified and clarified.
Faccioli Pietro
Lourenço Carlos
Seixas Joao
Woehri Hermine K.
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