Abstract
With the recent LHCb data on production and based on heavy quark spin symmetry, we obtain the long-distance matrix elements for both and productions, among which, the color-singlet one for is obtained directly by the fit of experiment for the first time. Using our long-distance matrix elements, we can provide good description of the and hadroproduction measurements. Our predictions on polarization are in good agreement with the LHCb data, explain most of the CMS data, and pass through the two sets of CDF measurements in the medium region. Considering all the possible uncertainties carefully, we obtained quite narrow bands of the polarization curves.
- Received 2 December 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.092006
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