Upsilon polarization measurement at CDF
Thomas Kuhr (for the CDF Collaboration)
TL;DR
This paper reports the measurement of Upsilon(1S) polarization at CDF, extending the pT range and revealing a trend towards longitudinal polarization at high pT, which challenges existing non-relativistic QCD predictions.
Contribution
It provides the first detailed measurement of Upsilon(1S) polarization at high transverse momentum at CDF, extending previous results and testing QCD predictions.
Findings
Observed trend towards longitudinal polarization at high pT
Measurement extends previous pT range for polarization studies
Results disagree with non-relativistic QCD predictions
Abstract
Measurements of production cross sections and polarizations are essential inputs for a theoretical understanding of heavy vector meson production. In this article the CDF measurement of the Y(1S) polarization in the kinematic range |y|<0.6 and 2 < pT [GeV/c] < 40 using a data sample of 2.9/fb is described. Compared to the CDF Run I measurement, with which it agrees, it extends the covered pT range, allowing for a better comparison to predictions in the perturbative regime. The observed trend towards longitudinal polarization at high transverse momentum disagrees with predictions based on non-relativistic QCD.
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