Evidence for the decay $X(3872)\to \psi (2S)\gamma$

Abstract

Evidence for the decay mode $X(3872)\to \psi (2S)\gamma$ in $B^{+}\to X(3872)K^{+}$ decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton-proton collisions, corresponding to an integrated luminosity of 3fb${}^{-1}$ collected with the LHCb detector, at centre-of-mass energies of 7 and 8TeV. The ratio of the branching fraction of the $X(3872)\to \psi (2S)\gamma$ decay to that of the $X(3872)\to J/\psi \gamma$ decay is measured to be $$\frac{Br(X(3872)\to \psi (2S)\gamma )}{Br(X(3872)\to J/\psi \gamma )}=2.46\pm 0.64\pm 0.29,$$ where the first uncertainty is statistical and the second is systematic. The measured value agrees with expectations for a pure charmonium interpretation of the $X(3872)$ state and a mixture of charmonium and molecular interpretations. However, it does not support a pure $D{\bar{D}}^{\ast }$ molecular interpretation of the $X(3872)$state.

19 pages, 4 figures

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• PYTHIA 6.4 Physics and Manual
• Higher Charmonia and X,Y,Z states with Screened Potential
• The Exotic XYZ Charmonium-like Mesons
• QCD Sum Rules for the X(3872) as a mixed molecule-charmoniun state
• Measurement of the ratio of prompt ${\chi }_c$ to $J/\psi$ production in $pp$ collisions at $\sqrt{s}=7$ TeV
• Radiative E1 decays of X(3872)

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