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Ahmed, H; Aihara, H; Akar, S; Badhrees, I; Bakich, A M; Barlow, R J; Bettarini, S; Biasini, M; Bozzi, C; Bračko, M; Buzykaev, A R; Calabrese, R; Cenci, R; Chen, A; Choi, Y; Choudhury, S; Cowan, R; Davier, M; De Nardo, G; Denig, A G; Eigen, G; Eisner, A M; Epifanov, D; Field, R C; Fritsch, M; Fulsom, B G; Gershon, T J; Li Gioi, L; Goldenzweig, P; Golob, B; Gradl, W; Graham, M T; Grünberg, O; Hara, T; Hayashii, H; Hearty, C; Hirose, S; Van Hulse, C; Inami, K; Inguglia, G; Innes, W R; Iwasaki, M; Jia, S; Kim, D Y; Kim, J B; Kodyš, P; Kowalewski, R; Kravchenko, E A; Križan, P; Krokovny, P; Kulasiri, R; Kwon, Y-J; Le Diberder, F; Lees, J P; Leith, D W G S; Li, L K; Li, Y B; Luitz, S; Margoni, M; Martellotti, S; Martinez-Vidal, F; Masuda, M; McKenna, J A; Miyashita, T S; Mohanty, G B; Müller, T; Nayak, M; Nisar, N K; Oberhof, B; Ogawa, S; Oyanguren, A; Pakhlov, P; Pedlar, T K; Posocco, M; Randle-Conde, A; Roberts, D A; Sacco, R; Al Said, S; Schneider, O; Schroeder, T; Schwartz, A J; Seino, Y; Sekula, S J; Shen, C P; Simi, G; Simonetto, F; Skovpen, Yu I; Soffer, A; Solodov, E P; Starič, M; Summers, D J; Sun, L; Takizawa, M; Taras, P; Wang, C H; Wilson, F F; Wisniewski, W J; Wu, S L; Ye, H; Zhulanov, V
Physical review letters, 2018-Dec-28, Volume: 121, Issue: 26Journal Article
We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B^{0}→D^{(*)}h^{0} with D→K_{S}^{0}π^{+}π^{-} decays, where h^{0}∈{π^{0},η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10^{6}BBover ¯ pairs recorded by the BABAR detector and (772±11)×10^{6}BBover ¯ pairs recorded by the Belle detector. The results of the measurement are 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 β of the CKM Unitarity Triangle is β=22.5±4.4(stat)±1.2(syst)±0.6(model)°. The measurement assumes no direct CP violation in B^{0}→D^{(*)}h^{0} decays. The quoted model uncertainties are due to the composition of the D^{0}→K_{S}^{0}π^{+}π^{-} decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e^{+}e^{-}→ccover ¯ data sample. CP violation is observed in B^{0}→D^{(*)}h^{0} decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.
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