Speaker
Ms
Lingzhu Bian
(Wuhan University)
Description
The angular distributions for the decay cascade $D\to K_{1}(1270,1400)\ell^+\nu_{\ell}\to (K\pi\pi)\ell^+\nu_{\ell} (\ell=e,\mu)$ have been derived, and we found that the measurement of up-down asymmetry in $D\to K_{1}e^+\nu_e\to (K\pi\pi)e^+\nu_{e}$ and angular distributions in $D\to K_{1}\ell^+\nu_\ell\to (K\pi\pi)\ell^+\nu_{\ell}$ can help to determine the hadronic amplitude requested in $B\to K_1(\to K\pi\pi)\gamma$, which allows us to extract the photon polarization. Based on the first observation of the $D^0\to K_1(1270)^- e^+\nu_e$ semileptonic decay currently presented at BESIII, we expect that the angular analysis on $D\to K_{1}\ell^+\nu_\ell\to (K\pi\pi)\ell^+\nu_{\ell} (\ell=e,\mu) $ at LHCb and STCF can give us a precise determination of photon polarization in $b\to s\gamma$ transitions in combination with the $B\to K_1(1270)\gamma$ up-down asymmetry measurements.
| Presentation type | Oral |
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Primary author
Ms
Lingzhu Bian
(Wuhan University)
