Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 97-101 |
| Number of pages | 5 |
| Journal | Journal of the Korean Physical Society |
| Volume | 33 |
| Issue number | 1 |
| Publication status | Published - 1998 Dec 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Polarized J/ψ production at CLEO. / Baek, Seungwon; Lee, Jungil; Song, H. S.; Ko, P.
In: Journal of the Korean Physical Society, Vol. 33, No. 1, 01.12.1998, p. 97-101.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Polarized J/ψ production at CLEO
AU - Baek, Seungwon
AU - Lee, Jungil
AU - Song, H. S.
AU - Ko, P.
PY - 1998/12/1
Y1 - 1998/12/1
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.
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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 -