2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

Measurement of the branching fraction of $B \to X_s \gamma$ and $A_{CP}$ in $B \to X_{s+d} \gamma$ from Belle

5 Jul 2014, 15:00
Sala 3+4 ()

Sala 3+4

Oral presentation Flavour Physics Flavour Physics


Mr. Luis Pesantez (University of Bonn)


The radiative B decays proceed through a loop diagram and are sensitive to New Physics. We perform measurements of the branching fraction of $B \to X_s \gamma$, where $X_s$ is the hadronic state with strangeness. Using a semi-inclusive method in which $X_s$ is reconstructed with 38 exclusive modes, the inclusive branching fraction in $M_{X_s} < 2.8$ GeV is measured. We also report the measurement using the recoil tag method. The Standard Model predicts null CP asymmetry ($A_{CP}$) of $B \to X_{s+d} \gamma$, where $X_{s+d}$ is the hadronic state with strange or down quark. We present a measurement of $A_{CP}$ with lepton tag. The analyses are based on the full data set of Belle containing 772 million $B \bar{B}$ pairs.

Primary author

Prof. Youngjoon Kwon (Yonsei University)

Presentation Materials


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