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Measurement of cos2β in B0 →d (∗)h0 with D → KS0 π+π- decays by a combined time-dependent Dalitz plot analysis of B a B ar and Belle data

  • Author(s): Adachi, I
  • Adye, T
  • Ahmed, H
  • Ahn, JK
  • Aihara, H
  • Akar, S
  • Alam, MS
  • Albert, J
  • Anulli, F
  • Arnaud, N
  • Asner, DM
  • Aston, D
  • Atmacan, H
  • Aushev, T
  • Ayad, R
  • Badhrees, I
  • Bakich, AM
  • Banerjee, S
  • Bansal, V
  • Barlow, RJ
  • Batignani, G
  • Beaulieu, A
  • Behera, P
  • Bellis, M
  • Ben-Haim, E
  • Bernard, D
  • Bernlochner, FU
  • Bettarini, S
  • Bettoni, D
  • Bevan, AJ
  • Bhardwaj, V
  • Bhuyan, B
  • Bianchi, F
  • Biasini, M
  • Biswal, J
  • Blinov, VE
  • Bomben, M
  • Bondar, A
  • Bonneaud, GR
  • Bozek, A
  • Bozzi, C
  • Bračko, M
  • Browder, TE
  • Brown, DN
  • Brown, DN
  • Bünger, C
  • Burchat, PR
  • Buzykaev, AR
  • Calabrese, R
  • Calcaterra, A
  • Calderini, G
  • Di Carlo, S
  • Carpinelli, M
  • Cartaro, C
  • Casarosa, G
  • Cenci, R
  • Chao, DS
  • Chauveau, J
  • Cheaib, R
  • Chen, A
  • Chen, C
  • Cheng, CH
  • Cheon, BG
  • Chilikin, K
  • Cho, K
  • Choi, Y
  • Choudhury, S
  • Chrzaszcz, M
  • Cibinetto, G
  • Cinabro, D
  • Cochran, J
  • Coleman, JP
  • Convery, MR
  • Cowan, G
  • Cowan, R
  • Cremaldi, L
  • Cunliffe, S
  • Dash, N
  • Davier, M
  • Davis, CL
  • De Mori, F
  • De Nardo, G
  • Denig, AG
  • De Sangro, R
  • Dey, B
  • Di Lodovico, F
  • Dittrich, S
  • DoleŽal, Z
  • Dorfan, J
  • Drásal, Z
  • Druzhinin, VP
  • Dunwoodie, W
  • Ebert, M
  • Echenard, B
  • Eidelman, S
  • Eigen, G
  • Eisner, AM
  • Emery, S
  • Epifanov, D
  • Ernst, JA
  • et al.

Published Web Location

http://10.0.4.79/physrevd.98.112012
No data is associated with this publication.
Abstract

© 2018 authors. Published by the American Physical Society. We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB pairs collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e-→cc data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2-β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(∗)h0 decays. The measurement assumes no direct CP violation in B0→D(∗)h0 decays.

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