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arXiv · 1102.2759

Observation of $B_s^0\to J/ψf_0(980)$ and Evidence for $B_s^0\to J/ψf_0(1370)$

Jin Li
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Abstract

We report the first observation of $B_s^0\to J/ψf_0(980)$ and first evidence for $B_s^0\to J/ψf_0(1370)$, which are CP eigenstate decay modes. These results are obtained from $121.4\;\mathrm{fb}^{-1}$ of data collected at the $Υ(5S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. We measure the branching fractions $\mathcal{B}(B_s^0\to J/ψf_0(980);f_0(980)\toπ^+π^-)=(1.16^{+0.31}_{-0.19}(\mathrm{stat.})^{+0.15}_{-0.17}(\mathrm{syst.})^{+0.26}_{-0.18}(N_{B_s^{(*)}\bar B_s^{(*)}})) \times 10^{-4}$ with a significance of $8.4σ$, and $\mathcal{B}(B_s^0\to J/ψf_0(1370);f_0(1370)\toπ^+π^-)=(0.34^{+0.11}_{-0.14}(\mathrm{stat.})^{+0.03}_{-0.02}(\mathrm{syst.})^{+0.08}_{-0.05}(N_{B_s^{(*)}\bar B_s^{(*)}})) \times 10^{-4}$ with a significance of $4.2σ$. The last error listed is due to uncertainty in the number of produced $B_s^{(*)}\bar B_s^{(*)}$ pairs.

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Jin Li. 2011-04-15. Observation of $B_s^0\to J/ψf_0(980)$ and Evidence for $B_s^0\to J/ψf_0(1370)$. https://doi.org/10.1103/physrevlett.106.121802

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