1305.7342 (Hiroyuki Ishida et al.)

Effective Valence Quark Model and a Possible Dip in $d Br(B \to K \ell
\bar{\ell})/dq^2$    [PDF]

Hiroyuki Ishida, Yoshio Koide

In rare $B$ meson decays $B\rightarrow K \ell^+ \ell^-$, a possible contribution of $\ell^+\ell^-$ emission via photon from the "spectator quark" $q$ ($q=u,d$) in the $B$ meson $(q\bar{b})$ is investigated in addition to the conventional one $\bar{b} \rightarrow \bar{s} +\gamma \rightarrow \bar{s} +\ell^+ + \ell^-$. As a result of the interference between the conventional one and a new one, a dip appears in $d \Gamma(B\rightarrow K \ell^+ \ell^-)/d q^2$ at a small region of $q^2 \equiv m_{\ell\ell}^2$. The interference effect in the $B^0$ decay will be observed differently from that in the $B^+$ decay.

View original: http://arxiv.org/abs/1305.7342