chic1 and chic2 polarization as a probe of color octet channelстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 декабря 2020 г.
Аннотация:We analyze joint LHC data on the production of chic1 and chic2 mesons together with the polarization data obtained very recently by the CMS Collaboration at 8 TeV. Our consideration is based on the kt-factorization approach and nonrelativistic QCD formalism for the formation of bound states. The observed polar anisotropy of chic1 and chic2 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 chic1 and chic2 states.