Gluon fragmentation into polarized charmonium

Cho, Peter ; Wise, Mark B. ; Trivedi, Sandip P. (1995) Gluon fragmentation into polarized charmonium Physical Review D - Particles, Fields, Gravitation and Cosmology, 51 (5). R2039-R2043. ISSN 1550-7998

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Gluon fragmentation to xcJ(1P) followed by single photon emission represents the dominant source of prompt J/ψ's at the Fermilab Tevatron for p⊥ ≳6 GeV. Since fragmenting gluons are approximately transverse, their products are significantly polarized. We find that gluon fragmentation populates the helicity levels of xc1, xc2, and J/ψ according to Dxc1(h=0): D xc1(|h|=1) ⋍ 1:1, D xc2(h=0): Dxc2(|h|=1):D xc2(|h|=2) ⋍1 : 2.9 : 6.0, and D J/ψ(h=0) : D J/ψ(||h||=1) ⋍ 1 : 3.4. We also speculate that gluon fragmentation to the radially excited xc2(2P) state followed by radiative decay could represent a large source of ψ'(2S)'s and potentially resolve the ψ'. A measurement of these states' polarizations would test this idea.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:57603
Deposited On:27 Aug 2011 15:01
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