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Abstract: Measurements of production cross sections and polarizations are essentialinputs for a theoretical understanding of heavy vector meson production. Inthis article the CDF measurement of the Y1S polarization in the kinematicrange |y|<0.6 and 2 < pT GeV-c < 40 using a data sample of 2.9-fb isdescribed. Compared to the CDF Run I measurement, with which it agrees, itextends the covered pT range, allowing for a better comparison to predictionsin the perturbative regime. The observed trend towards longitudinalpolarization at high transverse momentum disagrees with predictions based onnon-relativistic QCD.



Autor: Thomas Kuhr, for the CDF Collaboration

Fuente: https://arxiv.org/







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