학술논문

Measurement of $\cos{2\beta}$ in $B^{0} \to D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data
Document Type
Working Paper
Author
BaBar, TheCollaborations, BelleAdachi, I.Adye, T.Ahmed, H.Ahn, J. K.Aihara, H.Akar, S.Alam, M. S.Albert, J.Anulli, F.Arnaud, N.Asner, D. M.Aston, D.Atmacan, H.Aushev, T.Ayad, R.Badhrees, I.Bakich, A. M.Banerjee, Sw.Bansal, V.Barlow, R. J.Batignani, G.Beaulieu, A.Behera, P.Bellis, M.Ben-Haim, E.Bernard, D.Bernlochner, F. U.Bettarini, S.Bettoni, D.Bevan, A. J.Bhardwaj, V.Bhuyan, B.Bianchi, F.Biasini, M.Biswal, J.Blinov, V. E.Bomben, M.Bondar, A.Bonneaud, G. R.Bozek, A.Bozzi, C.Bračko, M.Browder, T. E.Brown, D. N.Bünger, C.Burchat, P. R.Buzykaev, A. R.Calabrese, R.Calcaterra, A.Calderini, G.Di Carlo, S.Carpinelli, M.Cartaro, C.Casarosa, G.Cenci, R.Chao, D. S.Chauveau, J.Cheaib, R.Chen, A.Chen, C.Cheng, C. H.Cheon, B. G.Chilikin, K.Cho, K.Choi, Y.Choudhury, S.Chrzaszcz, M.Cibinetto, G.Cinabro, D.Cochran, J.Coleman, J. P.Convery, M. R.Cowan, G.Cowan, R.Cremaldi, L.Cunliffe, S.Dash, N.Davier, M.Davis, C. L.De Mori, F.De Nardo, G.Denig, A. G.de Sangro, R.Dey, B.Di Lodovico, F.Dittrich, S.Doležal, Z.Dorfan, J.Drásal, Z.Druzhinin, V. P.Dunwoodie, W.Ebert, M.Echenard, B.Eidelman, S.Eigen, G.Eisner, A. M.Emery, S.Epifanov, D.Ernst, J. A.Faccini, R.Fast, J. E.Feindt, M.Ferrarotto, F.Ferroni, F.Field, R. C.Filippi, A.Finocchiaro, G.Fioravanti, E.Flood, K. T.Forti, F.Fritsch, M.Fulsom, B. G.Gabathuler, E.Gamba, D.Garg, R.Garmash, A.Gary, J. W.Garzia, I.Gaur, V.Gaz, A.Gelb, M.Gershon, T. J.Gioi, L. LiGiorgi, M. A.Giri, A.Godang, R.Goldenzweig, P.Golob, B.Golubev, V. B.Gorodeisky, R.Gradl, W.Graham, M. T.Grauges, E.Griessinger, K.Gritsan, A. V.Grünberg, O.Guido, E.Guttman, N.Hafner, A.Hara, T.Harrison, P. F.Hast, C.Hayasaka, K.Hearty, C.Heck, M.Hedges, M. T.Heß, M.Hirose, S.Hitlin, D. G.Honscheid, K.Hou, W. -S.Huard, Z.Van Hulse, C.Hutchcroft, D. E.Inami, K.Inguglia, G.Innes, W. R.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Izen, J. M.Jacobs, W. W.Jawahery, A.Jessop, C. P.Jia, S.Jin, Y.Joo, K. K.Julius, T.Kaliyar, A. B.Kang, K. H.Karyan, G.Kass, R.Kichimi, H.Kim, D. Y.Kim, J. B.Kim, K. T.Kim, S. H.Kim, J.Kim, P.King, G. J.Kinoshita, K.Koch, H.Kodyš, P.Kolomensky, Yu. G.Korpar, S.Kotchetkov, D.Kowalewski, R.Kravchenko, E. A.Križan, P.Kroeger, R.Krokovny, P.Kuhr, T.Kulasiri, R.Kuzmin, A.Kwon, Y. -J.Lacker, H. M.Lafferty, G. D.Lanceri, L.Lange, J. S.Lange, D. J.Lankford, A. J.Latham, T. E.Leddig, T.Diberder, F. LeLee, I. S.Lee, S. C.Lees, J. P.Leith, D. W. G. S.Li, L. K.Li, Y. B.Li, Y.Libby, J.Liventsev, D.Lockman, W. S.Long, O.LoSecco, J. M.Lou, X. C.Lubej, M.Lueck, T.Luitz, S.Luo, T.Luppi, E.Lusiani, A.Lutz, A. M.MacFarlane, D. B.MacNaughton, J.Mallik, U.Manoni, E.Marchiori, G.Margoni, M.Martellotti, S.Martinez-Vidal, F.Masuda, M.Matsuda, T.Mattison, T. S.Matvienko, D.McKenna, J. A.Meadows, B. T.Merola, M.Miyabayashi, K.Miyashita, T. S.Miyata, H.Mizuk, R.Mohanty, G. B.Mori, T.Muller, D. R.Müller, T.Mussa, R.Nakano, E.Nakao, M.Nanut, T.Nath, K. J.Nayak, M.Neal, H.Neri, N.Nisar, N. K.Nishida, S.Nugent, I. M.Oberhof, B.Ocariz, J.Ogawa, S.Ongmongkolkul, P.Ono, H.Onuchin, A. P.Oyanguren, A.Pakhlov, P.Pakhlova, G.Pal, B.Palano, A.Palombo, F.Vazquez, W. PanduroPaoloni, E.Pardi, S.Park, H.Passaggio, S.Patrignani, C.Patteri, P.Paul, S.Pavelkin, I.Payne, D. J.Pedlar, T. K.Peimer, D. R.Peruzzi, I. M.Piccolo, M.Piilonen, L. E.Pilloni, A.Piredda, G.Poireau, V.Porter, F. C.Posocco, M.Prell, S.Prepost, R.Puccio, E. M. T.Purohit, M. V.Pushpawela, B. G.Rama, M.Randle-Conde, A.Ratcliff, B. N.Raven, G.Resmi, P. K.Ritchie, J. L.Ritter, M.Rizzo, G.Roberts, D. A.Robertson, S. H.Röhrken, M.Roney, J. M.Roodman, A.Rossi, A.Rotondo, M.Rozanska, M.Russo, G.Sacco, R.Said, S. AlSakai, Y.Sandilya, S.Santelj, L.Santoro, V.Sanuki, T.Savinov, V.Schneider, O.Schnell, G.Schroeder, T.Schubert, K. R.Schwanda, C.Schwartz, A. J.Schwitters, R. F.Sciacca, C.Seddon, R. M.Seino, Y.Sekula, S. J.Senyo, K.Seon, O.Serednyakov, S. I.Sevior, M. E.Shebalin, V.Shibata, T. -A.Shimizu, N.Shiu, J. -G.Simi, G.Simon, F.Simonetto, F.Skovpen, Yu. I.Smith, J. G.Smith, A. J. S.So, R. Y.Sobie, R. J.Soffer, A.Sokoloff, M. D.Solodov, E. P.Solovieva, E.Spanier, S. M.Starič, M.Stroili, R.Sullivan, M. K.Sumisawa, K.Sumiyoshi, T.Summers, D. J.Sun, L.Takizawa, M.Tamponi, U.Tanida, K.Taras, P.Tasneem, N.Tenchini, F.Tisserand, V.Todyshevx, K. Yu.Touramanis, C.Uchida, M.Uglov, T.Unno, Y.Uno, S.Vahsen, S. E.Varner, G.Vasseur, G.Va'vra, J.Červenkov, D.Verderi, M.Vitale, L.Vorobyev, V.Voß, C.Wagner, S. R.Waheed, E.Waldi, R.Walsh, J. J.Wang, B.Wang, C. H.Wang, M. -Z.Wang, P.Wilson, F. F.Wilson, J. R.Wisniewski, W. J.Won, E.Wormser, G.Wright, D. M.Wu, S. L.Yuan, C. Z.Yusa, Y.Zakharov, S.Zallo, A.Zani, L.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.Zupanc, A.
Source
Phys. Rev. D 98, 112012 (2018)
Subject
High Energy Physics - Experiment
Language
Abstract
We report measurements of $\sin{2\beta}$ and $\cos{2\beta}$ from a time-dependent Dalitz plot analysis of $B^{0} \to D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays, where the light unflavored and neutral hadron $h^{0}$ is a $\pi^{0}$, $\eta$, or $\omega$ meson. The analysis is performed with a combination of the final data sets of the \babar\ and Belle experiments containing $471 \times 10^{6}$ and $772 \times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon\left(4S\right)$ resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure $\sin{2\beta} = 0.80 \pm 0.14 \,(\rm{stat.}) \pm 0.06 \,(\rm{syst.}) \pm 0.03 \,(\rm{model})$ and $\cos{2\beta} = 0.91 \pm 0.22 \,(\rm{stat.}) \pm 0.09 \,(\rm{syst.}) \pm 0.07 \,(\rm{model})$. The result for the direct measurement of the angle is $\beta = \left( 22.5 \pm 4.4 \,(\rm{stat.}) \pm 1.2 \,(\rm{syst.}) \pm 0.6 \,(\rm{model}) \right)^{\circ}$. The last quoted uncertainties are due to the composition of the $D^{0} \to K_{S}^{0} \pi^{+} \pi^{-}$ decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics $e^{+}e^{-} \to c\bar{c}$ data sample as part of this analysis. We find the first evidence for $\cos2\beta>0$ at the level of $3.7$ standard deviations. The measurement excludes the trigonometric multifold solution $\pi/2 - \beta = (68.1 \pm 0.7)^{\circ}$ 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 $\beta = 0^{\circ}$ is ruled out at the level of $5.1$ standard deviations, and thus CP violation is observed in $B^{0} \to D^{(*)} h^{0}$ decays.
Comment: To be submitted to Physical Review D