NSF PAR Search | NSF Public Access Repository

Angular analysis of

B \to K^{*} e^{+} e^{-}

in the low-

q^{2}

region with new electron identification at Belle

https://doi.org/10.1103/PhysRevD.110.072005

Ferlewicz, D; Urquijo, P; Adachi, I; Adamczyk, K; Aihara, H; Asner, D M; Atmacan, H; Ayad, R; Babu, V; Banerjee, Sw; et al (October 2024, Physical Review D)

We perform an angular analysis of the

B \to K^{*} e^{+} e^{-}

decay for the dielectron mass squared,

q^{2}

, range of

0.0008 - 1.1200 {GeV}^{2} / c^{4}

using the full Belle dataset in the

K^{* 0} \to K^{+} π^{-}

and

K^{* +} \to K_{S}^{0} π^{+}

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 \to K^{*} e^{+} e^{-}

differential decay rate and measure the imaginary component of the transversality amplitude to be

A_{T}^{Im} = - 1.27 \pm 0.52 \pm 0.12

, and the

K^{*}

transverse asymmetry to be

A_{T}^{(2)} = 0.52 \pm 0.53 \pm 0.11

, with

F_{L}

and

A_{T}^{Re}

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. Published by the American Physical Society2024

Full Text Available

Search for: All records