Angular distributions of the polarized photons and electron in the decays of the 3D3 state of charmonium

Alex W K MOK, Cheuk Ping Wong, Wai Yu Sit

Research output: Contribution to journalArticlepeer-review

Abstract

We calculate the combined angular-distribution functions of the polarized photons (γ1 and γ2) and electron (e-) produced in the cascade process pp → 3D33p21 → (ψ+γ2)+γ1 → (e++e-)+γ12, when the colliding p̄ and p are unpolarized. Our results are independent of any dynamical models and are expressed in terms of the spherical harmonics whose coefficients are functions of the angular-momentum helicity amplitudes of the individual processes. Once the joint angular distribution of (γ1γ2) and that of (γ2,e-) with the polarization of either one of the two particles are measured, our results will enable one to determine the relative magnitudes as well as the relative phases of all the angular-momentum helicity amplitudes in the radiative decay processes 3D33P2 + γ1 and 3p2 → ψ + γ2.

Original languageEnglish
Article number2723
Pages (from-to)1-13
Number of pages13
JournalEuropean Physical Journal C
Volume74
Issue number2
DOIs
Publication statusPublished - Feb 2014

Scopus Subject Areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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