Angular analysis of B → K^* e^+ e^- in the low-q^2 region with new electron identification at Belle
arxiv(2024)
Abstract
We perform an angular analysis of the B→ K^* e^+ e^- decay for the
dielectron mass squared, q^2, range of 0.0008 to 1.1200 GeV^2
/c^4 using the full Belle data set in the K^*0→ K^+ π^- and K^*+→ K_S^0 π^+ channels, incorporating new methods of electron identification
to improve the statistical power of the data set. 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_T^ Im = -1.27
± 0.52 ± 0.12, and the K^* transverse asymmetry to be A_T^(2) = 0.52
± 0.53 ± 0.11. The resulting constraints on the value of
𝒞_7^' are consistent with the Standard Model within a
2σ confidence interval.
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