Search for the decay B0 -> phi gamma
Belle Collaboration: Z. King, B. Pal, A. J. Schwartz, I. Adachi, H., Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, A. M., Bakich, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, A. Bozek, T., E. Browder, D. \v{C}ervenkov, V. Chekelian, B. G. Cheon
TL;DR
This study searched for the rare decay B0 -> phi gamma using Belle data but found no signal, setting the most stringent upper limit to date on its branching fraction.
Contribution
The paper provides the first and most restrictive upper limit on the B0 -> phi gamma decay branching fraction using the full Belle dataset.
Findings
No signal observed for B0 -> phi gamma decay.
Upper limit on branching fraction set at 1.0 x 10^{-7}.
Most stringent limit to date on this decay mode.
Abstract
We have searched for the decay B0 -> phi gamma using the full Belle data set of 772 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. No signal is observed, and we set an upper limit on the branching fraction of B(B0 -> phi gamma) < 1.0 x 10^{-7} at 90% confidence level. This is the most stringent limit on this decay mode to date.
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