https://doi.org/10.1140/epjc/s10052-020-08617-0
Regular Article – Theoretical Physics
and 
polarization as a probe of color octet channel
1
P.N. Lebedev Institute of Physics, 119991, Moscow, Russia
2
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, Moscow, Russia
3
Joint Institute for Nuclear Research, 141980, Dubna, Moscow Region, Russia
Received:
16
August
2020
Accepted:
29
October
2020
Published online:
4
November
2020
We analyze joint LHC data on the production of and mesons together with the polarization data obtained very recently by the CMS Collaboration at 
TeV. Our consideration is based on the 
-factorization approach and nonrelativistic QCD formalism for the formation of bound states. The observed polar anisotropy of and decays can be described as a combined effect of the color-singlet and color-octet contributions. We extract the corresponding long-distance matrix elements from the fits. Our fits point to unequal color singlet wave functions for and states.
© The Author(s) 2020
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