We report results from a study of B +/- -> DK +/- decays followed by D decaying to the CP-even final state K+K- and CP-odd final state K-S(0)pi(0), where D is an admixture of D-0 and (D) over bar (0) states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle phi(3). The results are based on a combined analysis of the final data set of 772 x 10(6) B (B) over bar pairs collected by the Belle experiment and a data set of 198 x 10(6) B (B) over bar pairs collected by the Belle II experiment, both in electron-positron collisions at the Y(4S) resonance. We measure the CP asymmetries to be A(CP+) = (+12.5 +/- 5.8 +/- 1.4)% and A(CP-) = (-16.7 +/- 5.7 +/- 0.6)%, and the ratios of branching fractions to be RCP+ = 1.164 +/- 0.081 +/- 0.036 and RCP- = 1.151 +/- 0.074 +/- 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries A(CP+) and A(CP-) have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5 degrees < phi(3) < 16.5 degrees) or (84.5 degrees < phi(3) < 95.5 degrees) or (163.3 degrees < phi(3) < 171.5 degrees) and 0.321 < r(B) < 0.465.

Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., et al. (2024). Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 2024(5) [10.1007/jhep05(2024)212].

Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II

Branchini, P.
Membro del Collaboration Group
;
Budano, A.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Pietro, G.
Membro del Collaboration Group
;
Laurenza, M.
Membro del Collaboration Group
;
Martellini, C.
Membro del Collaboration Group
;
Martini, A.
Membro del Collaboration Group
;
2024-01-01

Abstract

We report results from a study of B +/- -> DK +/- decays followed by D decaying to the CP-even final state K+K- and CP-odd final state K-S(0)pi(0), where D is an admixture of D-0 and (D) over bar (0) states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle phi(3). The results are based on a combined analysis of the final data set of 772 x 10(6) B (B) over bar pairs collected by the Belle experiment and a data set of 198 x 10(6) B (B) over bar pairs collected by the Belle II experiment, both in electron-positron collisions at the Y(4S) resonance. We measure the CP asymmetries to be A(CP+) = (+12.5 +/- 5.8 +/- 1.4)% and A(CP-) = (-16.7 +/- 5.7 +/- 0.6)%, and the ratios of branching fractions to be RCP+ = 1.164 +/- 0.081 +/- 0.036 and RCP- = 1.151 +/- 0.074 +/- 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries A(CP+) and A(CP-) have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5 degrees < phi(3) < 16.5 degrees) or (84.5 degrees < phi(3) < 95.5 degrees) or (163.3 degrees < phi(3) < 171.5 degrees) and 0.321 < r(B) < 0.465.
2024
Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., et al. (2024). Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 2024(5) [10.1007/jhep05(2024)212].
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/11590/480887
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 0
social impact