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

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

2005-06-22

arxiv.org/abs/hep-ph/0506222v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, one figure, new value of decay constant f_B=216 Mev used; references added

Scientific paper

$B\to\chi_{c1}(1P,2P)K$ 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 $B\to\chi_{c1}(2P)K$ decay rate can be comparable to $B\to\chi_{c1}(1P)K$, and get $Br(B^0 \to \chi_{c1}' K^0) =Br(B^+ \to \chi_{c1}' K^+)\approx 2\times 10^{-4}$. 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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