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Report/Journal Article | PUBDB-2015-00857 |
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2015
American Physical Society
[S.l.]
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Please use a persistent id in citations: doi:10.1103/PhysRevD.91.011101
Report No.: BELLE-PREPRINT-2014-18; arXiv:1411.7771
Abstract: We search for the decay ${B}_{s}^{0}\to \gamma \gamma $ and measure the branching fraction for ${B}_{s}^{0}\to \varphi \gamma $ using $121.4\text{}\text{}{\mathrm{fb}}^{-1}$ of data collected at the $\mathrm{\Upsilon }\left(5S\right)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{-}$ collider. The ${B}_{s}^{0}\to \varphi \gamma $ branching fraction is measured to be $\left(3.6±0.5\left(\text{stat}\right)±0.3\left(\text{syst}\right)±0.6\left({f}_{s}\right)\right)×1{0}^{-5}$, where ${f}_{s}$ is the fraction of ${B}_{s}^{\left(*\right)}{\overline{B}}_{s}^{\left(*\right)}$ in $b\overline{b}$ events. Our result is in good agreement with the theoretical predictions as well as with a recent measurement from LHCb. We observe no statistically significant signal for the decay ${B}_{s}^{0}\to \gamma \gamma $ and set a 90% confidence-level upper limit on its branching fraction at $3.1×1{0}^{-6}$. This constitutes a significant improvement over the previous result.
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; Upsilon(10870): electroproduction ; Upsilon(10870): hadronic decay ; B/s0: radiative decay ; B/s0: branching ratio: measured ; B/s0: branching ratio: upper limit ; experimental results ; BELLE ; KEK-B ; B/s0 --> 2photon ; B/s0 --> Phi(1020) photon
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Search for $B_{s}^{0}\rightarrow\gamma\gamma$ and a measurement of the branching fraction for $B_{s}^{0}\rightarrow\phi\gamma$
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