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arXiv · 1411.7771

Search for $B_{s}^{0}\rightarrowγγ$ and a measurement of the branching fraction for $B_{s}^{0}\rightarrowϕγ$

Belle Collaboration·D. Dutta·B. Bhuyan·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·K. Arinstein·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·T. Aziz·S. Bahinipati·A. M. Bakich·V. Bansal·V. Bhardwaj·A. Bobrov·G. Bonvicini·M. Bračko·T. E. Browder·D. Červenkov·A. Chen·B. G. Cheon·K. Chilikin·R. Chistov·K. Cho·V. Chobanova·Y. Choi·D. Cinabro·J. Dalseno·Z. Doležal·Z. Drásal·A. Drutskoy·K. Dutta·S. Eidelman·H. Farhat·J. E. Fast·O. Frost·V. Gaur·S. Ganguly·A. Garmash·D. Getzkow·Y. M. Goh·B. Golob·H. Hayashii·X. H. He·W. -S. Hou·T. Iijima·A. Ishikawa·Y. Iwasaki·I. Jaegle·D. Joffe·K. H. Kang·E. Kato·C. Kiesling·D. Y. Kim·J. B. Kim·J. H. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·B. R. Ko·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·T. Kuhr·A. Kuzmin·Y. -J. Kwon·J. S. Lange·I. S. Lee·P. Lewis·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·D. Matvienko·H. Miyata·R. Mizuk·G. B. Mohanty·A. Moll·T. Mori·R. Mussa·E. Nakano·M. Nakao·T. Nanut·M. Nayak·N. K. Nisar·S. Nishida·S. Ogawa·S. Okuno·P. Pakhlov·G. Pakhlova·T. K. Pedlar·R. Pestotnik·M. Petrič·L. E. Piilonen
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Abstract

We search for the decay $B_{s}^{0}\rightarrowγγ$ and measure the branching fraction for $B_{s}^{0}\rightarrowϕγ$ using 121.4~$\textrm{fb}^{-1}$ of data collected at the $Υ(\mathrm{5}S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The $B_{s}^{0}\rightarrowϕγ$ branching fraction is measured to be $(3.6 \pm 0.5 (\mathrm{stat.}) \pm 0.3 (\mathrm{syst.}) \pm 0.6 (f_{s})) \times 10^{-5}$, where $f_{s}$ is the fraction of $B_{s}^{(*)}\bar{B}_{s}^{(*)}$ in $b\bar{b}$ 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 $B_{s}^{0}\rightarrowγγ$ and set a $90\%$ confidence-level upper limit on its branching fraction at $ 3.1 \times 10^{-6}$. This constitutes a significant improvement over the previous result.

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Belle Collaboration, D. Dutta, B. Bhuyan, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, T. Aziz, S. Bahinipati, A. M. Bakich, V. Bansal, V. Bhardwaj, A. Bobrov, G. Bonvicini, M. Bračko, T. E. Browder, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, Z. Doležal, Z. Drásal, A. Drutskoy, K. Dutta, S. Eidelman, H. Farhat, J. E. Fast, O. Frost, V. Gaur, S. Ganguly, A. Garmash, D. Getzkow, Y. M. Goh, B. Golob, H. Hayashii, X. H. He, W. -S. Hou, T. Iijima, A. Ishikawa, Y. Iwasaki, I. Jaegle, D. Joffe, K. H. Kang, E. Kato, C. Kiesling, D. Y. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, A. Kuzmin, Y. -J. Kwon, J. S. Lange, I. S. Lee, P. Lewis, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, T. Mori, R. Mussa, E. Nakano, M. Nakao, T. Nanut, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, P. Pakhlov, G. Pakhlova, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen. 2014-11-28. Search for $B_{s}^{0}\rightarrowγγ$ and a measurement of the branching fraction for $B_{s}^{0}\rightarrowϕγ$. https://doi.org/10.1103/physrevd.91.011101

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