Search for $\eta_c(2S)\to p\bar{p}K^+K^-$ and measurement of $\chi_{cJ}\to p\bar{p}K^+K^-$ in $\psi(3686)$ radiative decays

Collaboration

Jan 3, 2025

12 pages

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Abstract: (arXiv)

A search for

\eta_c(2S)\to p\bar{p}K^+K^-

, together with measurement of branching fractions of

\chi_{cJ(J=0,1,2)}\to p\bar{p}K^+K^-

in the

\psi(3686) \to \gamma \eta_c(2S)

and the

\psi(3686) \to \gamma \chi_{cJ}

radiative decays, is performed with

(2712.4\pm14.3)\times 10^6

\psi(3686)

events collected with the BESIII detector at the BEPCII collider. An evidence for

\eta_c(2S)\to p\bar{p}K^+K^-

is found, with a significance of

3.3\sigma

. The product branching fraction of

\mathcal{B}[\psi(3686)\to\gamma\eta_c(2S)]\cdot\mathcal{B}[\eta_c(2S)\to p\bar{p}K^+K^-]

is determined to be

(1.98\mkern 2mu\pm\mkern 2mu0.41_{\text{stat.}}\mkern 2mu\pm\mkern 2mu0.99_{\text{syst.}})\times 10^{-7}

. The product branching fractions of

\mathcal{B}[\psi(3686)\to\gamma\chi_{cJ}]\cdot\mathcal{B}[\chi_{cJ}\to p\bar{p}K^+K^-]

are measured to be

(2.49\mkern 2mu\pm\mkern 2mu 0.03_{\text{stat.}}\mkern 2mu\pm\mkern 2mu 0.15_{\text{syst.}})\times 10^{-5}

,

(1.83\mkern 2mu \pm\mkern 2mu 0.02_{\text{stat.}}\mkern 2mu \pm\mkern 2mu 0.11_{\text{syst.}})\times 10^{-5}

, and

(2.43\mkern 2mu\pm\mkern 2mu 0.02_{\text{stat.}}\mkern 2mu\pm\mkern 2mu 0.15_{\text{syst.}})\times 10^{-5}

, for

J=0,\ 1

, and 2, respectively.

Note:

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Search for ηc(2S)→ppˉK+K−\eta_c(2S)\to p\bar{p}K^+K^-ηc​(2S)→ppˉ​K+K− and measurement of χcJ→ppˉK+K−\chi_{cJ}\to p\bar{p}K^+K^-χcJ​→ppˉ​K+K− in ψ(3686)\psi(3686)ψ(3686) radiative decays