Abstract
A sizable right-handed photon polarization in b→sγ is a clear signal for new physics. In this Letter, we point out that the photon helicity in b→sγ can be unambiguously extracted by combining the measurements in B→K_{1}γ and the Cabibbo-favored D→K_{1}e^{+}ν decay. We propose a ratio of up-down asymmetries in D→K_{1}e^{+}ν to quantify the hadronic effects. A method for measuring, in experiment, the involved partial decay widths in the ratio is discussed, and experimental facilities like BESIII, Belle-II and LHCb are likely to measure this ratio. We also give the angular distribution that is useful for extracting the photon polarization in the presence of different kaon resonances.
Highlights
A sizable right-handed photon polarization in b → sγ is a clear signal for new physics
We propose a ratio of up-down asymmetries in D → K1eþν to quantify the hadronic effects
Introduction.—Nowadays, searching for new physics is the primary objective in particle physics
Summary
Introduction.—Nowadays, searching for new physics is the primary objective in particle physics. In this Letter, we point out that the photon helicity in b → sγ can be unambiguously extracted by combining the measurements in B → K1γ and the Cabibbo-favored D → K1eþν decay. We give the angular distribution that is useful for extracting the photon polarization in the presence of different kaon resonances.
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