χc1 and χc2 polarization as a probe of color octet channel
We analyze joint LHC data on the production of χ c 1 and χ c 2 mesons together with the polarization data obtained very recently by the CMS Collaboration at s = 8 TeV. Our consideration is based on the k T -factorization approach and nonrelativistic QCD formalism for the formation of bound states....
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| Veröffentlicht in: | The European physical journal. C, Particles and fields Particles and fields, 2020-11, Vol.80 (11) |
|---|---|
| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | We analyze joint LHC data on the production of
χ
c
1
and
χ
c
2
mesons together with the polarization data obtained very recently by the CMS Collaboration at
s
=
8
TeV. Our consideration is based on the
k
T
-factorization approach and nonrelativistic QCD formalism for the formation of bound states. The observed polar anisotropy of
χ
c
1
and
χ
c
2
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
χ
c
1
and
χ
c
2
states. |
|---|---|
| ISSN: | 1434-6044 1434-6052 |
| DOI: | 10.1140/epjc/s10052-020-08617-0 |