We propose the measurement of the decay angular distribution of leptons from J ψ's produced at high transverse momentum balanced by a photon [or gluon] in hadronic collisions. The polar and azimuthal angular distribution are calculated in the color singlet model (CSM). It is shown that the general structure of the decay lepton distribution is controlled by four invariant structure functions, which are functions of the transverse momentum and the rapidity of the J ψ. We found that two of these structure functions [the longitudinal and transverse interference structure functions] are identical in the CSM. We present analytical and numerical results in the Collins-Soper and in the Gottfried-Jackson frame.
Bibliographical noteFunding Information:
The work of E.M. is supportedi n part by the US Departmento f Energy under contractN os. DE-AC02-76ER00881 and DE-FG03-9 lER40674, by Texas National Research Laboratory Grant No. RGFY93-330, and by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni ResearchF oundation. The work of CSK is supported in part by the Korean Science and Engineering Foundation, in part by Non-Direct-Research-Fund, Korea Research Foundation 1993, in part by the Center for Theoretical Physics, Seoul National University, and in part by the Basic Science ResearchI nstitute Program, Ministry of Education, 1994, Project No. BSRI-94-2425.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics