Speaker
Ayesh Gunawardana
(Wayne State University)
Description
The rare inclusive decay $\bar{B}\rightarrow X_s\gamma$ is an important probe of physics beyond the standard model. The largest uncertainty on the decay rate and CP asymmetry comes from resolved photon contributions. They first appear at order $1/m_b$ in the heavy quark expansion and arise from operators other than $Q_{7\gamma}$. One of the three leading contributions in the heavy quark expansion, $Q_1^q-Q_{7\gamma}$ is described by a non-local function whose moments are related to HQET parameters. We use recent progress in our knowledge of these parameters to better constrain the resolved photon contribution to $\bar{B}\rightarrow X_s\gamma$ total rate and CP asymmetry.
Primary authors
Ayesh Gunawardana
(Wayne State University)
Gil Paz
(Wayne State University)
