Observation of Polarization in Bottomonium Production at sqrt(s)=38.8 GeV

Details Observation of Polarization in Bottomonium Production at sqrt(s)=38.8 GeV Observation of Polarization in Bottomonium Production at sqrt(s)=38.8 GeV

2000-11-09

arxiv.org/abs/hep-ex/0011030v1

Phys.Rev.Lett.86:2529-2532,2001

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.86.2529

We present a measurement of the polarization observed for bottomonium states produced in p-Cu collisions at sqrt(s)=38.8 GeV. The angular distribution of the decay dimuons of the Upsilon(1S) state show no polarization at small xF and pT but significant positive transverse production polarization for either pT > 1.8 GeV/c or for xF > 0.35. The Upsilon(2S+3S) unresolved states show a large transverse production polarization at all values of xF and pT measured. These observations are compared with an NRQCD calculation that predicts a transverse polarization in bottomonium production arising from quark-antiquark fusion and gluon-gluon fusion diagrams.

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