Observation of $B_s^0\to J/\psi f_0(980)$ and Evidence for $B_s^0\to J/\psi f_0(1370)$

Abstract

We report the first observation of $B_s^0\to J/\psi f_0(980)$ and first evidence for $B_s^0\to J/\psi f_0(1370)$, which are CP eigenstate decay modes. These results are obtained from $121.4{\mathrm{fb}}^{-1}$ of data collected at the ${\rm Y}(5S)$ resonance with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. We measure the branching fractions $\mathcal{B}(B_s^0\to J/\psi f_0(980);f_0(980)\to {\pi }^{+}{\pi }^{-})=(1.16_{-0.19}^{+0.31}(stat.{)}_{-0.17}^{+0.15}(syst.{)}_{-0.18}^{+0.26}(N_{B_s^{(\ast )}{\bar{B}}_s^{(\ast )}}))\times 10^{-4}$ with a significance of $8.4\sigma$, and $\mathcal{B}(B_s^0\to J/\psi f_0(1370);f_0(1370)\to {\pi }^{+}{\pi }^{-})=(0.34_{-0.14}^{+0.11}(stat.{)}_{-0.02}^{+0.03}(syst.{)}_{-0.05}^{+0.08}(N_{B_s^{(\ast )}{\bar{B}}_s^{(\ast )}}))\times 10^{-4}$ with a significance of $4.2\sigma$. The last error listed is due to uncertainty in the number of produced $B_s^{(\ast )}{\bar{B}}_s^{(\ast )}$ pairs.

5 pages, 2 figures, 2 tables, published in PRL

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