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.

Measurement of cos2β in Bº →d(∗)hº with D → KSº π⁺π⁻decays by a combined time-dependent Dalitz plot analysis of B a B ar and Belle data / I. Adachi, T. Adye, H. Ahmed, J.K. Ahn, H. Aihara, S. Akar, M.S. Alam, J. Albert, F. Anulli, N. Arnaud, D.M. Asner, D. Aston, H. Atmacan, T. Aushev, R. Ayad, I. Badhrees, A.M. Bakich, S. Banerjee, V. Bansal, R.J. Barlow, G. Batignani, A. Beaulieu, P. Behera, M. Bellis, E. Ben-Haim, D. Bernard, F.U. Bernlochner, S. Bettarini, D. Bettoni, A.J. Bevan, V. Bhardwaj, B. Bhuyan, F. Bianchi, M. Biasini, J. Biswal, V.E. Blinov, M. Bomben, A. Bondar, G.R. Bonneaud, A. Bozek, C. Bozzi, M. Bracko, T.E. Browder, D.N. Brown, D.N. Brown, C. Bunger, P.R. Burchat, A.R. Buzykaev, R. Calabrese, A. Calcaterra, G. Calderini, S. Di Carlo, M. Carpinelli, C. Cartaro, G. Casarosa, R. Cenci, D.S. Chao, J. Chauveau, R. Cheaib, A. Chen, C. Chen, C.H. Cheng, B.G. Cheon, K. Chilikin, K. Cho, Y. Choi, S. Choudhury, M. Chrzaszcz, G. Cibinetto, D. Cinabro, J. Cochran, J.P. Coleman, M.R. Convery, G. Cowan, R. Cowan, L. Cremaldi, S. Cunliffe, N. Dash, M. Davier, C.L. Davis, F. De Mori, G. De Nardo, A.G. Denig, R. De Sangro, B. Dey, F. Di Lodovico, S. Dittrich, Z. Dolezal, J. Dorfan, Z. Drasal, V.P. Druzhinin, W. Dunwoodie, M. Ebert, B. Echenard, S. Eidelman, G. Eigen, A.M. Eisner, S. Emery, D. Epifanov, J.A. Ernst, R. Faccini, J.E. Fast, M. Feindt, F. Ferrarotto, F. Ferroni, R.C. Field, A. Filippi, G. Finocchiaro, E. Fioravanti, K.T. Flood, F. Forti, M. Fritsch, B.G. Fulsom, E. Gabathuler, D. Gamba, R. Garg, A. Garmash, J.W. Gary, I. Garzia, V. Gaur, A. Gaz, M. Gelb, T.J. Gershon, L. Li Gioi, M.A. Giorgi, A. Giri, R. Godang, P. Goldenzweig, B. Golob, V.B. Golubev, R. Gorodeisky, W. Gradl, M.T. Graham, E. Grauges, K. Griessinger, A.V. Gritsan, O. Grunberg, E. Guido, N. Guttman, A. Hafner, T. Hara, P.F. Harrison, C. Hast, K. Hayasaka, C. Hearty, M. Heck, M.T. Hedges, M. Hess, S. Hirose, D.G. Hitlin, K. Honscheid, W.-. Hou, Z. Huard, C. Van Hulse, D.E. Hutchcroft, K. Inami, G. Inguglia, W.R. Innes, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, J.M. Izen, W.W. Jacobs, A. Jawahery, C.P. Jessop, S. Jia, Y. Jin, K.K. Joo, T. Julius, A.B. Kaliyar, K.H. Kang, G. Karyan, R. Kass, H. Kichimi, D.Y. Kim, J.B. Kim, K.T. Kim, S.H. Kim, J. Kim, P. Kim, G.J. King, K. Kinoshita, H. Koch, P. Kodys, Y.G. Kolomensky, S. Korpar, D. Kotchetkov, R. Kowalewski, E.A. Kravchenko, P. Krizan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, A. Kuzmin, Y.-. Kwon, H.M. Lacker, G.D. Lafferty, L. Lanceri, J.S. Lange, D.J. Lange, A.J. Lankford, T.E. Latham, T. Leddig, F. Le Diberder, I.S. Lee, S.C. Lee, J.P. Lees, D.W.G.S. Leith, L.K. Li, Y.B. Li, Y. Li, J. Libby, D. Liventsev, W.S. Lockman, O. Long, J.M. Losecco, X.C. Lou, M. Lubej, T. Lueck, S. Luitz, T. Luo, E. Luppi, A. Lusiani, A.M. Lutz, D.B. Macfarlane, J. Macnaughton, U. Mallik, E. Manoni, G. Marchiori, M. Margoni, S. Martellotti, F. Martinez-Vidal, M. Masuda, T. Matsuda, T.S. Mattison, D. Matvienko, J.A. Mckenna, B.T. Meadows, M. Merola, K. Miyabayashi, T.S. Miyashita, H. Miyata, R. Mizuk, G.B. Mohanty, T. Mori, D.R. Muller, T. Muller, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K.J. Nath, M. Nayak, H. Neal, N. Neri, N.K. Nisar, S. Nishida, I.M. Nugent, B. Oberhof, J. Ocariz, S. Ogawa, P. Ongmongkolkul, H. Ono, A.P. Onuchin, A. Oyanguren, P. Pakhlov, G. Pakhlova, B. Pal, A. Palano, F. Palombo, W. Panduro Vazquez, E. Paoloni, S. Pardi, H. Park, S. Passaggio, C. Patrignani, P. Patteri, S. Paul, I. Pavelkin, D.J. Payne, T.K. Pedlar, D.R. Peimer, I.M. Peruzzi, M. Piccolo, L.E. Piilonen, A. Pilloni, G. Piredda, V. Poireau, F.C. Porter, M. Posocco, S. Prell, R. Prepost, E.M.T. Puccio, M.V. Purohit, B.G. Pushpawela, M. Rama, A. Randle-Conde, B.N. Ratcliff, G. Raven, P.K. Resmi, J.L. Ritchie, M. Ritter, G. Rizzo, D.A. Roberts, S.H. Robertson, M. Rohrken, J.M. Roney, A. Roodman, A. Rossi, M. Rotondo, M. Rozanska, G. Russo, R. Sacco, S. Al Said, Y. Sakai, S. Sandilya, L. Santelj, V. Santoro, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, T. Schroeder, K.R. Schubert, C. Schwanda, A.J. Schwartz, R.F. Schwitters, C. Sciacca, R.M. Seddon, Y. Seino, S.J. Sekula, K. Senyo, O. Seon, S.I. Serednyakov, M.E. Sevior, V. Shebalin, T.-. Shibata, N. Shimizu, J.-. Shiu, G. Simi, F. Simon, F. Simonetto, Y.I. Skovpen, J.G. Smith, A.J.S. Smith, R.Y. So, R.J. Sobie, A. Soffer, M.D. Sokoloff, E.P. Solodov, E. Solovieva, S.M. Spanier, M. Staric, R. Stroili, M.K. Sullivan, K. Sumisawa, T. Sumiyoshi, D.J. Summers, L. Sun, M. Takizawa, U. Tamponi, K. Tanida, P. Taras, N. Tasneem, F. Tenchini, V. Tisserand, K.Y. Todyshevx, C. Touramanis, M. Uchida, T. Uglov, Y. Unno, S. Uno, S.E. Vahsen, G. Varner, G. Vasseur, J. Va'Vra, D. Cervenkov, M. Verderi, L. Vitale, V. Vorobyev, C. Voss, S.R. Wagner, E. Waheed, R. Waldi, J.J. Walsh, B. Wang, C.H. Wang, M.-. Wang, P. Wang, F.F. Wilson, J.R. Wilson, W.J. Wisniewski, E. Won, G. Wormser, D.M. Wright, S.L. Wu, C.Z. Yuan, Y. Yusa, S. Zakharov, A. Zallo, L. Zani, Z.P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov, A. Zupanc. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 98:11(2018 Dec 26), pp. 112012.112012-1-112012.112012-29. [10.1103/PhysRevD.98.112012]

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

N. Neri;F. Palombo;F. Simonetto;
2018

Abstract

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.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
26-dic-2018
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/661165
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