Abstract
Decays based on the b → sγ transition are expected to yield left-handed photons in the Standard Model, but could be particularly sensitive to New Physics contributions modifying the short-distance Wilson coefficients \( \mathcal{C} \)7 and \( \mathcal{C} \)7′ defined in the low-energy Effective Field Theory. These coefficients can be determined by combining observables of several modes, among which Bs → ϕee at low q2, in a kinematic range where the photon-pole is dominant. We investigate the impact of Bs − \( \overline{B} \)s mixing on the angular observables available for this mode, which induces a time-dependent modulation governed by interference terms between mixing and decay that are sensitive to the moduli and phases of \( \mathcal{C} \)7 and \( \mathcal{C} \)7′. These interference terms can be extracted through a time-dependent analysis but they also affect time-integrated observables. In particular, we show that the asymmetries \( {A}_T^{(2)} \) and \( {A}_T^{\left(\operatorname{Im}\right); CP} \) receive terms of potentially similar size from mixing-independent and mixing-induced terms, and we discuss how the constraints coming from the angular analysis of Bs → ϕee at low q2 should be interpreted in the presence of mixing.
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Descotes-Genon, S., Plakias, I. & Sumensari, O. On the impact of meson mixing on Bs → ϕee angular observables at low q2. J. High Energ. Phys. 2023, 96 (2023). https://doi.org/10.1007/JHEP02(2023)096
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DOI: https://doi.org/10.1007/JHEP02(2023)096