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 Model values. The resulting constraints on the value of C7′ are consistent with the Standard Model within a 2σ confidence interval.

Angular analysis of B →k∗e+e- in the low- q2 region with new electron identification at Belle / Ferlewicz, D., Urquijo, P., Adachi, I., Adamczyk, K., Aihara, H., Asner, D.M., Atmacan, H., Ayad, R., Babu, V., Banerjee, S., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswas, D., Bodrov, D., Bracko, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:7(2024). [10.1103/PhysRevD.110.072005]

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

Campajola M.;Di Capua F.;Merola M.;Pardi S.;Russo Guido;
2024

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 Model values. The resulting constraints on the value of C7′ are consistent with the Standard Model within a 2σ confidence interval.
2024
Angular analysis of B →k∗e+e- in the low- q2 region with new electron identification at Belle / Ferlewicz, D., Urquijo, P., Adachi, I., Adamczyk, K., Aihara, H., Asner, D.M., Atmacan, H., Ayad, R., Babu, V., Banerjee, S., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswas, D., Bodrov, D., Bracko, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:7(2024). [10.1103/PhysRevD.110.072005]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/985726
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
social impact