Branching fraction measurement for the decayB0s ! and search for the decay B0s! at high energy e+e_ collisions at energy

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We measure the branching fraction for the decay B0 s and search for the decay B0 s using 121.4 fb of data collected at the resonance with the Belle detector at the KEKB asymmetric energy B-factory located at the High Energy Accelerator Research Organization (KEK), Japan. B0 s branching fraction is computed to be (3.7+0.6 0.7) स 10 with a signal significance of 10.6 including the systematic uncertainties. This result is in good agreement with the theoretical predictions and a recent indirect estimate from LHCb. We do not observe any significant signal for the B0 s and have thus set the 90% confidence level upper limit on its branching fraction to be 3.1 This result improves on the previously published 90% confidence level upper limit by a factor of about 3 and provides the most stringent limit till date.
Supervisor: Bipul Bhuyan