Heavy Quark Fragmentation to Polarised Quarkonium

Details Heavy Quark Fragmentation to Polarised Quarkonium Heavy Quark Fragmentation to Polarised Quarkonium

1993-05-12

arxiv.org/abs/hep-ph/9305260v2

Phys.Lett. B312 (1993) 486-490

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 1 figure included, uses harvmac.tex and epsf.tex, UCSD/PTH 93-06, CALT-68-1864, SLAC-PUB-6175

Scientific paper

10.1016/0370-2693(93)90986-R

We calculate the polarisation of $\psi$'s and $\Upsilon$'s produced by the fragmentation of heavy quarks. We find that fragmentation to transversely aligned quarkonium is slightly enhanced relative to longitudinally polarised. This net alignment corresponds to a $\sim 5\%$ asymmetry in the angular distribution of leptons produced in the subsequent decay of the quarkonium. We point out that the leading gluon contribution to $\psi$ and $\Upsilon$ production arises from the evolution of the charm quark fragmentation function, rather than from direct gluon fragmentation.

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