Evidence of a new narrow resonance decaying to ${\chi }_{c1}\gamma$ in $B\to {\chi }_{c1}\gamma K$

Abstract

We report measurements of $B\to {\chi }_{c1}\gamma K$ and ${\chi }_{c2}\gamma K$ decays using $772\times 10^6$ $B\bar{B}$ events collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. Evidence of a new resonance in the ${\chi }_{c1}\gamma$ final state is found with a statistical significance of $3.8\sigma$. This state has a mass of $3823.1\pm 1.8(stat)\pm 0.7(syst)$ MeV/$c^2$, a value that is consistent with theoretical expectations for the previously unseen $1^3{D}_2$ $c\bar{c}$ meson. We find no other narrow resonance and set upper limits on the branching fractions of the $X(3872)\to {\chi }_{c1}\gamma$ and ${\chi }_{c2}\gamma$ decays.

7 pages, 4 figures

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