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Arnaud, N.; Atmacan, H.; Aushev, T.; Batignani, G.; Bernlochner, F. U.; Biasini, M.; Biswal, J.; Bonneaud, G. R.; Bozek, A.; Bozzi, C.; Burchat, P. R.; Choi, Y.; Cowan, G.; Cowan, R.; Cremaldi, L.; Cunliffe, S.; De Nardo, G.; Denig, A. G.; Dey, B.; Ebert, M.; Emery, S.; Ernst, J. A.; Faccini, R.; Feindt, M.; Ferroni, F.; Field, R. C.; Forti, F.; Garmash, A.; Gelb, M.; Golob, B.; Golubev, V. B.; Guido, E.; Harrison, P. F.; Hedges, M. T.; Heß, M.; Honscheid, K.; Huard, Z.; Ishikawa, A.; Iwasaki, M.; Izen, J. M.; Jacobs, W. W.; Jia, S.; Kang, K. H.; Karyan, G.; Kim, J. B.; King, G. J.; Kotchetkov, D.; Kroeger, R.; Kwon, Y.-J.; Lange, J. S.; Latham, T. E.; Le Diberder, F.; Leith, D. W. G. S.; Li, L. K.; Liventsev, D.; Lueck, T.; Matsuda, T.; Meadows, B. T.; Miyashita, T. S.; Mizuk, R.; Nanut, T.; Nath, K. J.; Neal, H.; Onuchin, A. P.; Pakhlov, P.; Paoloni, E.; Paul, S.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Randle-Conde, A.; Raven, G.; Ritter, M.; Rizzo, G.; Roberts, D. A.; Robertson, S. H.; Rotondo, M.; Sacco, R.; Sandilya, S.; Santelj, L.; Santoro, V.; Schneider, O.; Schroeder, T.; Shiu, J.-G.; Skovpen, Yu. I.; Smith, J. G.; So, R. Y.; Sobie, R. J.; Solovieva, E.; Summers, D. J.; Tenchini, F.; Uglov, T.; Unno, Y.; Uno, S.; Va’vra, J.; Vitale, L.; Wagner, S. R.; Waldi, R.; Wang, P.; Zakharov, S.
Physical review. D, 12/2018, Letnik: 98, Številka: 11Journal Article
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 B a B ar and Belle experiments containing 471×106 and 772×106 B B ¯ pairs collected at the Υ ( 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- → c c ¯ 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.
