Angular analysis of B →k∗e e- in the low- q2 region with new electron identification at Belle

D Ferlewicz; P Urquijo; I Adachi; K Adamczyk; H Aihara; DM Asner; H Atmacan; R Ayad; V Babu; S Banerjee; P Behera; K Belous; J Bennett; M Bessner; V Bhardwaj; B Bhuyan; T Bilka; D Biswas; D Bodrov; M Bračko; P Branchini; TE Browder; A Budano; M Campajola; L Cao; D Červenkov; MC Chang; BG Cheon; K Chilikin; HE Cho; K Cho; SK Choi; Y Choi; S Choudhury; S Das; N Dash; G De Marino; G De Pietro; R Dhamija; F Di Capua; J Dingfelder; Z DoleŽal; TV Dong; S Dubey; P Ecker; D Epifanov; T Ferber; BG Fulsom; V Gaur; A Garmash; A Giri; P Goldenzweig; E Graziani; T Gu; Y Guan; K Gudkova; C Hadjivasiliou; T Hara; K Hayasaka; H Hayashii; S Hazra; MT Hedges; D Herrmann; WS Hou; CL Hsu; T Iijima; A Ishikawa; R Itoh; M Iwasaki; WW Jacobs; S Jia; Y Jin; AB Kaliyar; C Kiesling; CH Kim; DY Kim; KH Kim; YK Kim; K Kinoshita; P Kodyš; T Konno; A Korobov; S Korpar; E Kou; E Kovalenko; P KriŽan; P Krokovny; T Kuhr; R Kumar; K Kumara; A Kuzmin; YJ Kwon; YT Lai; T Lam; SC Lee; D Levit; P Lewis; LK Li; YB Li; L Li Gioi

Journal article

Angular analysis of B →k∗e e- in the low- q2 region with new electron identification at Belle

D Ferlewicz, P Urquijo, I Adachi, K Adamczyk, H Aihara, DM Asner, H Atmacan, R Ayad, V Babu, S Banerjee, P Behera, K Belous, J Bennett, M Bessner, V Bhardwaj, B Bhuyan, T Bilka, D Biswas, D Bodrov, M Bračko Show all

Physical Review D | American Physical Society (APS) | Published : 2024

DOI: 10.1103/PhysRevD.110.072005

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∗+→KS0π+ 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 C7(′). We perform a fit to the B→K∗e+e- differential decay rate and measure the imaginary component of the transversality amplitude to be ATIm=-1.27±0.52±0.12, and the K∗ transverse asymmetry to be AT(2)=0.52±0.53±0.11, with FL and ATRe fixed to the Standard..

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