TY - JOUR
T1 - Polarized J/ψ production at CLEO
AU - Baek, Seungwon
AU - Lee, Jungil
AU - Song, H. S.
AU - Ko, P.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 1998
Y1 - 1998
N2 - Polarizations of the prompt -J/ψ's produced in the e +e - annihilation at CLEO energy (√s = 10.58 GeV) are considered in the framework of the nonrelativistic quantum chromodynamics (NRQCD) factorization formalism. We find that the J/ψ polarization has a strong dependence on the production mechanism. At CLEO energy, the most dominant J/ψ production mechanism throughout most of phase space is the color-singlet mechanism, e +e - → J/ψ + gg, for which J/ψ's are highly longitudinally polarized. On the other hand, the dominant J/ψ production mechanism at the upper endpoint of the J/ψ energy distribution is the color-octet process, e +e - → (cc̄) (8) + g, for which J/ψ's are almost unpolarized. Thus, the measurement of the polarization of the endpoint J/ψ's is another test of the color-octet mechanism and a constraint on the NRQCD matrix elements.
AB - Polarizations of the prompt -J/ψ's produced in the e +e - annihilation at CLEO energy (√s = 10.58 GeV) are considered in the framework of the nonrelativistic quantum chromodynamics (NRQCD) factorization formalism. We find that the J/ψ polarization has a strong dependence on the production mechanism. At CLEO energy, the most dominant J/ψ production mechanism throughout most of phase space is the color-singlet mechanism, e +e - → J/ψ + gg, for which J/ψ's are highly longitudinally polarized. On the other hand, the dominant J/ψ production mechanism at the upper endpoint of the J/ψ energy distribution is the color-octet process, e +e - → (cc̄) (8) + g, for which J/ψ's are almost unpolarized. Thus, the measurement of the polarization of the endpoint J/ψ's is another test of the color-octet mechanism and a constraint on the NRQCD matrix elements.
UR - http://www.scopus.com/inward/record.url?scp=0032380665&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032380665&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0032380665
VL - 33
SP - 97
EP - 101
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 1
ER -