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 Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715988.0, MPI für Physik / YB 2016
Search for $B_{s}^{0}\\rightarrow\\gamma\\gamma$ and a measurement of the branching fraction for $B_{s}^{0}\\rightarrow\\phi\\gamma$
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:91
Start Page:011101
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We search for the decay $B_{s}^{0}\\rightarrow\\gamma\\gamma$ and measure the branching fraction for $B_{s}^{0}\\rightarrow\\phi\\gamma$ using 121.4~$\\textrm{fb}^{-1}$ of data collected at the $\\Upsilon(\\mathrm{5}S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The $B_{s}^{0}\\rightarrow\\phi\\gamma$ 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 $B_{s}^{0}\\rightarrow\\gamma\\gamma$ 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.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:6 pages, 3 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
Identifiers:
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