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$B\toχ_{c1}(1P,2P)K$ decays in QCD factorization and X(3872)

Ce Meng·Ying-Jia Gao·Kuang-Ta Chao
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Abstract

$B\toχ_{c1}(1P,2P)K$ decays are studied in QCD factorization by treating charmonia as nonrelativistic bound states. No infrared divergences exist in the vertex corrections, while the logarithmic end-point singularities in the hard spectator corrections can be regularized by a momentum cutoff. With certain uncertainties we find that the $B\toχ_{c1}(2P)K$ decay rate can be comparable to $B\toχ_{c1}(1P)K$, and get $Br(B^0 \to χ_{c1}' K^0) =Br(B^+ \to χ_{c1}' K^+)\approx 2\times 10^{-4}$. This might imply a possible interpretation for the newly discovered X(3872) that this state has a dominant $J^{PC} = 1^{++}(2P)$ $c\bar c$ component but mixed with a substantial $D^0\bar{D}^{*0}+D^{*0}\bar{D}^0$ continuum component.

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Ce Meng, Ying-Jia Gao, Kuang-Ta Chao. 2005-11-16. $B\toχ_{c1}(1P,2P)K$ decays in QCD factorization and X(3872). https://doi.org/10.1103/physrevd.87.074035

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