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27 April 2024

» arxiv » hep-ex/0011030

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Observation of Polarization in Bottomonium Production at sqrt(s)=38.8 GeV
C. N. Brown ; T. C. Awes ; M. E. Beddo ; M. L. Brooks ; J. D. Bush ; T. A. Carey ; T. H. Chang ; W. E. Cooper ; C. A. Gagliardi ; G. T. Garvey ; D. F. Geesaman ; E. A. Hawker ; X. C. He ; L. D. Isenhower ; D. M. Kaplan ; S. B. Kaufman ; D. D. Koetke ; G. Kyle ; W. M. Lee ; M. J. Leitch ; N. Makins ; P. L. McGaughey ; J. M. Moss ; B. A. Mueller ; P. M. Nord ; V. Papavassiliou ; B. K. Park ; J. C. Peng ; G. Petitt ; P. E. Reimer ; M. E. Sadler ; P. W. Stankus ; R. S. Towell ; R. E. Tribble ; M. A. Vasiliev ; J. C. Webb ; G. R. Young ;
Date:	9 Nov 2000
Journal:	Phys.Rev.Lett. 86 (2001) 2529-2532
Subject:	hep-ex
Abstract:	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.
Source:	arXiv, hep-ex/0011030
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