Novel Method to Reliably Determine the Photon Helicity in BâK_{1}γ.
Phys Rev Lett
; 125(5): 051802, 2020 Jul 31.
Article
en En
| MEDLINE
| ID: mdl-32794857
ABSTRACT
A sizable right-handed photon polarization in bâsγ is a clear signal for new physics. In this Letter, we point out that the photon helicity in bâsγ can be unambiguously extracted by combining the measurements in BâK_{1}γ and the Cabibbo-favored DâK_{1}e^{+}ν decay. We propose a ratio of up-down asymmetries in DâK_{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.
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2020
Tipo del documento:
Article
País de afiliación:
China