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Polarized J/psi from chi_{cJ} and psi' Decays at the Tevatron

Bernd A. Kniehl, Jungil Lee

Abstract

We calculate the partonic cross sections for the hadroproduction of polarized chi_{cJ} mesons using the factorization formalism of nonrelativistic QCD. We also describe how the polarization is passed on to the J/psi mesons in the radiative feed-down chi_{cJ} -> J/psi + gamma and in the double-cascade decays of psi' mesons via chi_{cJ} intermediate states. These represent the missing ingredients needed to predict the polarization of prompt J/psi mesons at the Fermilab Tevatron.

Polarized J/psi from chi_{cJ} and psi' Decays at the Tevatron

Abstract

We calculate the partonic cross sections for the hadroproduction of polarized chi_{cJ} mesons using the factorization formalism of nonrelativistic QCD. We also describe how the polarization is passed on to the J/psi mesons in the radiative feed-down chi_{cJ} -> J/psi + gamma and in the double-cascade decays of psi' mesons via chi_{cJ} intermediate states. These represent the missing ingredients needed to predict the polarization of prompt J/psi mesons at the Fermilab Tevatron.

Paper Structure

This paper contains 4 sections, 25 equations, 1 figure.

Table of Contents

  1. Introduction
  2. Covariant Tensor Decomposition of Polarized Cross Sections
  3. Polarization in Cascade
  4. Numerical Analysis

Figures (1)

  • Figure :