We perform an angular analysis of the B→K*e+e− decay for the dielectron mass squared, q2, range of 0.0008–1.1200  GeV2/c4 using the full Belle dataset in the K*0→K+π− and K*+→K0Sπ+ channels, incorporating new methods of electron identification to improve the statistical power of the dataset. This analysis is sensitive to contributions from right-handed currents from physics beyond the Standard Model by constraining the Wilson coefficients C(')_7. We perform a fit to the B→K*e+e− differential decay rate and measure the imaginary component of the transversality amplitude to be A^Im_T=−1.27±0.52±0.12, and the K* transverse asymmetry to be A^(2)_T=0.52±0.53±0.11, with FL and A^Re_T fixed to the Standard Model values. The resulting constraints on the value of C'_7 are consistent with the Standard Model within a 2⁢σ confidence interval.

Angular analysis of B→K*e+e- in the low-q2 region with new electron identification at Belle

Tenchini, F.;
2024-01-01

Abstract

We perform an angular analysis of the B→K*e+e− decay for the dielectron mass squared, q2, range of 0.0008–1.1200  GeV2/c4 using the full Belle dataset in the K*0→K+π− and K*+→K0Sπ+ channels, incorporating new methods of electron identification to improve the statistical power of the dataset. This analysis is sensitive to contributions from right-handed currents from physics beyond the Standard Model by constraining the Wilson coefficients C(')_7. We perform a fit to the B→K*e+e− differential decay rate and measure the imaginary component of the transversality amplitude to be A^Im_T=−1.27±0.52±0.12, and the K* transverse asymmetry to be A^(2)_T=0.52±0.53±0.11, with FL and A^Re_T fixed to the Standard Model values. The resulting constraints on the value of C'_7 are consistent with the Standard Model within a 2⁢σ confidence interval.
2024
Ferlewicz, D.; Urquijo, P.; Adachi, I.; Adamczyk, K.; Aihara, H.; Asner, D.  M.; Atmacan, H.; Ayad, R.; Babu, V.; Banerjee, Sw.; Behera, P.; Belous, K...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1274471
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