Gluon fragmentation into polarized charmonium

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.R2039· OSTI ID:6579878

Cho, P; Wise, M B ^[1]; Trivedi, S P ^[2]

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1. Lauritsen Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)
2. Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510 (United States)

Gluon fragmentation to [chi][sub [ital cJ]](1[ital P]) followed by single photon emission represents the dominant source of prompt [ital J]/[psi]'s at the Fermilab Tevatron for [ital p][sub [perpendicular]][approx gt]6 GeV. Since fragmenting gluons are approximately transverse, their products are significantly polarized. We find that gluon fragmentation populates the helicity levels of [chi][sub [ital c]1], [chi][sub [ital c]2], and [ital J]/[psi] according to [ital D][sub [chi]][sub [ital c]1][sup ([ital h]=0)]:[ital D][sub [chi]][sub [ital c]1][sup ([vert bar][ital h][vert bar]=1)] [congruent]1:1, [ital D][sub [chi]][sub [ital c]2][sup ([ital h]=0)]: [ital D][sub [chi]][sub [ital c]2][sup ([vert bar][ital h][vert bar]=1)]:[ital D][sub [chi]][sub [ital c]2][sup ([vert bar][ital h][vert bar]=2)] [congruent]1:2.8:6.0, and [ital D][sub [ital J]/[psi]][sup ([ital h]=0)]:[ital D][sub [ital J]/[psi]][sup ([vert bar][ital h][vert bar]=1)][congruent]1:3.4. We also speculate that gluon fragmentation to the radially excited [chi][sub [ital c]2](2[ital P]) state followed by radiative decay could represent a large source of [psi][prime](2[ital S])'s. A measurement of these states' polarizations would test this idea.

• DOE Contract Number: FG03-92ER40701; AC02-76CH03000
• OSTI ID: 6579878
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:5; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BOSONS
CHARMONIUM
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
EMISSION
FERMILAB TEVATRON
FRAGMENTATION
GLUONS
HADRONS
HELICITY
MESONS
PARTICLE DECAY
PARTICLE PROPERTIES
PHOTON EMISSION
POLARIZATION
POSTULATED PARTICLES
QUARKONIUM
RADIATIVE DECAY
SYNCHROTRONS