Status of the Upsilon Polarization Measurement at CDF

Details Status of the Upsilon Polarization Measurement at CDF Status of the Upsilon Polarization Measurement at CDF

2011-09-30

arxiv.org/abs/1110.0048v1

Physics

High Energy Physics

High Energy Physics - Experiment

Proceedings of the DPF-2011 Conference, Providence, RI, August 8-13, 2011

Scientific paper

The angular distributions of Upsilon(1S) to mu+ mu- decays are analyzed using a sample of Upsilon(1S) mesons in 2.9 fb^{-1} of data collected at sqrt{s} = 1.96TeV. The results of the one-dimensional angular analysis suggest that Upsilon(1S) may be longitudinal polarized at high transverse momentum. This observation is largely inconsistent with NRQCD prediction that predicts transverse polarization at high p_T.

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