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2010•Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsOpen access

Measurement of CP observables in B±→DCPK± decays and constraints on the CKM angle γ

P. del Amo Sanchez, J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, J. Garra Ticó, E. Graugés, M. Martinelli, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, M. Battaglia, D. N. Brown, B. H. Hooberman, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, I. L. Osipenkov, T. Tanabe, C. M. Hawkes, A. T. Watson, H. Koch, T. Vazquez Schroeder, D. J. Asgeirsson, C. Hearty, T. S. Mattison, J. A. McKenna, A. Khan, A. Randle-Conde, V. E. Blinov, А. Р. Бузыкаев, В. П. Дружинин, В. Б. Голубев, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, A. N. Yushkov, M. Bondioli, S. Curry, D. Kirkby, A. J. Lankford, M. Mandelkern, E. C. Martin, D. P. Stoker, H. Atmacan, J. W. Gary, F. Liu, O. Long, G. M. Vitug, C. Campagnari, T. M. Hong, D. Kovalskyi, J. Richman, A. M. Eisner, C. A. Heusch, J. Kroseberg, W. S. Lockman, A. J. Martínez, T. Schalk, B. A. Schumm, A. Seiden, L. O. Winstrom, C. H. Cheng, D. A. Doll, B. Echenard, D. G. Hitlin, P. Ongmongkolkul, F. C. Porter, A. Y. Rakitin, R. Andreassen, M. Dubrovin, G. Mancinelli, B. T. Meadows, M. D. Sokoloff, P. C. Bloom, W. T. Ford, A. Gaz, M. Nagel, U. Nauenberg, J. G. Smith, S. R. Wagner, R. Ayad, W. H. Toki, H. Jasper, T. M. Karbach, J. Merkel, A. Petzold, B. Spaan, K. Wacker, M. J. Kobel, K. R. Schubert, R. Schwierz, D. Bernard, M. Verderi, P. J. Clark, S. Playfer, J. E. Watson, M. Andreotti, D. Bettoni, C. Bozzi, R. Calabrese, A. Cecchi, G. Cibinetto, E. Fioravanti, P. Franchini, E. Luppi, M. Munerato, M. Negrini, A. Petrella, L. Piemontese, R. Baldini-Ferroli, A. Calcaterra, R. de Sangro, G. Finocchiaro, M. Nicolaci, S. Pacetti, P. Patteri, I. M. Peruzzi, M. Piccolo, M. Rama, A. Zallo, R. Contri, E. Guido, M. Lo Vetere, M. R. Monge, S. Passaggio, C. Patrignani, E. Robutti, S. Tosi, B. Bhuyan, V. Prasad, C. L. Lee, M. Morii, A. Adametz, J. Marks, S. Schenk, U. Uwer, F. U. Bernlochner, M. Ebert, H. M. Lacker, T. Lueck, A. Volk, P. D. Dauncey, M. J. Tibbetts, P. K. Behera, U. Mallik, C. Chen, J. Cochran, H. B. Crawley, L. Y. Dong, W. T. Meyer, S. Prell, E. I. Rosenberg, A. E. Rubin, Y. Y. Gao, A. V. Gritsan, Z. J. Guo, N. Arnaud, M. Davier, Д. Деркач, J. Firmino da Costa, G. Grosdidier, F. Le Diberder, A. M. Lutz, B. Malaescu, A. Pérez, P. Roudeau, M. H. Schune, J. Serrano, V. Sordini, A. Stocchi, L. Wang, G. Wormser, D. J. Lange, D. Wright, I. Bingham, C. A. Chavez, J. P. Coleman, J. R. Fry, E. Gabathuler, R. Gamet, D. Hutchcroft, D. J. Payne, C. Touramanis, A. J. Bevan, F. Di Lodovico, R. Sacco, M. Sigamani, G. Cowan, S. Paramesvaran, A. C. Wren, D. N. Brown, C. L. Davis, A. G. Denig, M. Fritsch, W. Gradl, A. Hafner, K. E. Alwyn, D. Bailey, R. J. Barlow, P. Jackson, G. Lafferty, T. J. West, J. Anderson, R. Cenci, A. Jawahery, D. A. Roberts, G. Simi, J. M. Tuggle, C. Dallapiccola, E. Salvati, R. Cowan, D. Dujmic, P. H. Fisher, G. Sciolla, M. Zhao, D. Lindemann, P. M. Patel, S. H. Robertson, M. Schram, P. Biassoni, A. Lazzaro, V. Lombardo, F. Palombo, S. Stracka, L. Cremaldi, R. Godang, R. Kroeger, P. Sonnek, D. J. Summers, X. Nguyen, Mikaël Simard, P. Taras, G. De Nardo, D. Monorchio, G. Onorato, C. Sciacca, G. Raven, H. L. Snoek, C. P. Jessop, K. J. Knoepfel, J. M. LoSecco, W. F. Wang, L. A. Corwin, K. Honscheid, R. Kass, J. P. Morris, A. M. Rahimi, N. L. Blount, J. Brau, R. Frey, O. Igonkina, J. A. Kolb, R. Rahmat, N. B. Sinev, D. Strom, J. Strube, E. Torrence, G. Castelli, E. Feltresi, N. Gagliardi, M. Margoni, M. Morandin, M. Posocco, M. Rotondo, F. Simonetto, R. Stroili, E. Ben-Haim, G. R. Bonneaud, H. Briand, G. Calderini, J. Chauveau, O. Hamon, Ph. Leruste, G. Marchiori, J. Ocariz, J. Prendki, S. Sitt, M. Biasini, E. Manoni, A. Rossi, C. Angelini, G. Batignani, S. Bettarini, M. Carpinelli, G. Casarosa, A. Cervelli, F. Forti, M. A. Giorgi, A. Lusiani, N. Néri, E. Paoloni, G. Rizzo, J. Walsh, D. Lopes Pegna, Chia‐Hui Lu, J. Olsen, A. J. S. Smith, A. V. Telnov, F. Anulli, E. Baracchini, G. Cavoto, R. Faccini, F. Ferrarotto, F. Ferroni, M. Gaspero, L. Li Gioi, M. A. Mazzoni, G. Piredda, F. Renga, T. Hartmann, T. Leddig, H. Schröder, R. Waldi, T. Adye, B. Franek, E. O. Olaiya, F. F. Wilson, S. Emery, G. Hamel de Monchenault, G. Vasseur, Ch. Yèche, M. Zito, M. T. Allen, D. Aston, D. J. Bard, R. Bartoldus, J. F. Benitez, C. Cartaro, M. R. Convery, J. Dorfan, G. P. Dubois-Felsmann, W. Dunwoodie, R. C. Field, M. Franco Sevilla, B. G. Fulsom, A. M. Gabareen, M. T. Graham, P. Grenier, C. Hast, W. R. Innes, M. H. Kelsey, H. Kim, P. Kim, M. L. Kocian, D. W. G. S. Leith, S. Li, B. Lindquist, S. Luitz, V. Luth, H. L. Lynch, D. B. MacFarlane, H. Marsiske, D. R. Muller, H. Neal, S. Nelson, C. P. O’Grady, I. Ofte, M. Perl, T. Pulliam, B. N. Ratcliff, A. Roodman, A. A. Salnikov, V. Santoro, R. H. Schindler, J. Schwiening, A. Snyder, D. Su, M. K. Sullivan, S. Sun, K. Suzuki, J. M. Thompson, J. Va’vra, A. P. Wagner, M. Weaver, C. A. West, W. J. Wisniewski, M. Wittgen, D. H. Wright, H. W. Wulsin, A. K. Yarritu, C. C. Young, V. Ziegler, X. R. Chen, W. Park, M. V. Purohit, R. M. White, J. R. Wilson, S. J. Sekula, M. Bellis, P. R. Burchat, A. J. Edwards, T. S. Miyashita, S. Ahmed, M. S. Alam, J. Ernst, B. Pan, M. A. Saeed, S. B. Zain, N. Guttman, A. Soffer, P. Lund, S. M. Spanier, R. Eckmann, J. L. Ritchie, A. M. Ruland, C. J. Schilling, R. F. Schwitters, B. C. Wray, J. M. Izen, X. C. Lou, F. Bianchi, D. Gamba, M. Pelliccioni, M. Bomben, L. Lanceri, L. Vitale, N. López-March, F. Martínez-Vidal, D. A. Milanés, A. Oyanguren, J. Albert, Sw. Banerjee, H. H. F. Choi, K. Hamano, G. J. King, R. Kowalewski, M. J. Lewczuk, I. M. Nugent, J. M. Roney, R. J. Sobie, T. J. Gershon, P. F. Harrison, T. Latham, E. M. T. Puccio, H. R. Band, S. Dasu, K. T. Flood, Y. Pan, R. Prepost, C. Vuosalo, S. L. Wu

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Abstract

Using the entire sample of $467\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ factory at the SLAC National Accelerator Laboratory, we perform an analysis of ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}D{K}^{\ifmmode\pm\else\textpm\fi{}}$ decays, using decay modes in which the neutral $D$ meson decays to either $CP$-eigenstates or non-$CP$-eigenstates. We measure the partial decay rate charge asymmetries for $CP$-even and $CP$-odd $D$ final states to be ${A}_{CP+}=0.25\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.02$ and ${A}_{CP\ensuremath{-}}=\ensuremath{-}0.09\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.02$, respectively, where the first error is the statistical and the second is the systematic uncertainty. The parameter ${A}_{CP+}$ is different from zero with a significance of 3.6 standard deviations, constituting evidence for direct $CP$ violation. We also measure the ratios of the charged-averaged $B$ partial decay rates in $CP$ and non-$CP$ decays, ${R}_{CP+}=1.18\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.05$ and ${R}_{CP\ensuremath{-}}=1.07\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.04$. We infer frequentist confidence intervals for the angle $\ensuremath{\gamma}$ of the unitarity triangle, for the strong phase difference ${\ensuremath{\delta}}_{B}$, and for the amplitude ratio ${r}_{B}$, which are related to the ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}D{K}^{\ensuremath{-}}$ decay amplitude by ${r}_{B}{e}^{i({\ensuremath{\delta}}_{B}\ensuremath{-}\ensuremath{\gamma})}=A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{\ensuremath{-}})/A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{K}^{\ensuremath{-}})$. Including statistical and systematic uncertainties, we obtain $0.24<{r}_{B}<0.45$ ($0.06<{r}_{B}<0.51$) and, modulo 180\ifmmode^\circ\else\textdegree\fi{}, $11.3\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<22.7\ifmmode^\circ\else\textdegree\fi{}$ or $80.8\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<99.2\ifmmode^\circ\else\textdegree\fi{}$ or $157.3\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<168.7\ifmmode^\circ\else\textdegree\fi{}$ ($7.0\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<173.0\ifmmode^\circ\else\textdegree\fi{}$) at the 68% (95%) confidence level.

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Using the entire sample of $467\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ factory at the SLAC National Accelerator Laboratory, we perform an analysis of ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}D{K}^{\ifmmode\pm\else\textpm\fi{}}$ decays, using decay modes in which the neutral $D$ meson decays to either $CP$-eigenstates or non-$CP$-eigenstates. We measure the partial decay rate charge asymmetries for $CP$-even and $CP$-odd $D$ final states to be ${A}_{CP+}=0.25\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.02$ and ${A}_{CP\ensuremath{-}}=\ensuremath{-}0.09\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.02$, respectively, where the first error is the statistical and the second is the systematic uncertainty. The parameter ${A}_{CP+}$ is different from zero with a significance of 3.6 standard deviations, constituting evidence for direct $CP$ violation. We also measure the ratios of the charged-averaged $B$ partial decay rates in $CP$ and non-$CP$ decays, ${R}_{CP+}=1.18\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.05$ and ${R}_{CP\ensuremath{-}}=1.07\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.04$. We infer frequentist confidence intervals for the angle $\ensuremath{\gamma}$ of the unitarity triangle, for the strong phase difference ${\ensuremath{\delta}}_{B}$, and for the amplitude ratio ${r}_{B}$, which are related to the ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}D{K}^{\ensuremath{-}}$ decay amplitude by ${r}_{B}{e}^{i({\ensuremath{\delta}}_{B}\ensuremath{-}\ensuremath{\gamma})}=A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{\ensuremath{-}})/A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{K}^{\ensuremath{-}})$. Including statistical and systematic uncertainties, we obtain $0.24<{r}_{B}<0.45$ ($0.06<{r}_{B}<0.51$) and, modulo 180\ifmmode^\circ\else\textdegree\fi{}, $11.3\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<22.7\ifmmode^\circ\else\textdegree\fi{}$ or $80.8\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<99.2\ifmmode^\circ\else\textdegree\fi{}$ or $157.3\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<168.7\ifmmode^\circ\else\textdegree\fi{}$ ($7.0\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<173.0\ifmmode^\circ\else\textdegree\fi{}$) at the 68% (95%) confidence level.

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Available abstract

Using the entire sample of $467\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ factory at the SLAC National Accelerator Laboratory, we perform an analysis of ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}D{K}^{\ifmmode\pm\else\textpm\fi{}}$ decays, using decay modes in which the neutral $D$ meson decays to either $CP$-eigenstates or non-$CP$-eigenstates. We measure the partial decay rate charge asymmetries for $CP$-even and $CP$-odd $D$ final states to be ${A}_{CP+}=0.25\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.02$ and ${A}_{CP\ensuremath{-}}=\ensuremath{-}0.09\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.02$, respectively, where the first error is the statistical and the second is the systematic uncertainty. The parameter ${A}_{CP+}$ is different from zero with a significance of 3.6 standard deviations, constituting evidence for direct $CP$ violation. We also measure the ratios of the charged-averaged $B$ partial decay rates in $CP$ and non-$CP$ decays, ${R}_{CP+}=1.18\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.05$ and ${R}_{CP\ensuremath{-}}=1.07\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.04$. We infer frequentist confidence intervals for the angle $\ensuremath{\gamma}$ of the unitarity triangle, for the strong phase difference ${\ensuremath{\delta}}_{B}$, and for the amplitude ratio ${r}_{B}$, which are related to the ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}D{K}^{\ensuremath{-}}$ decay amplitude by ${r}_{B}{e}^{i({\ensuremath{\delta}}_{B}\ensuremath{-}\ensuremath{\gamma})}=A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{\ensuremath{-}})/A({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}{K}^{\ensuremath{-}})$. Including statistical and systematic uncertainties, we obtain $0.24<{r}_{B}<0.45$ ($0.06<{r}_{B}<0.51$) and, modulo 180\ifmmode^\circ\else\textdegree\fi{}, $11.3\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<22.7\ifmmode^\circ\else\textdegree\fi{}$ or $80.8\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<99.2\ifmmode^\circ\else\textdegree\fi{}$ or $157.3\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<168.7\ifmmode^\circ\else\textdegree\fi{}$ ($7.0\ifmmode^\circ\else\textdegree\fi{}<\ensuremath{\gamma}<173.0\ifmmode^\circ\else\textdegree\fi{}$) at the 68% (95%) confidence level.

Key concepts: Physics, CP violation, Particle physics, Amplitude, Electron–positron annihilation, Analytical Chemistry (journal), Hadron, Quantum mechanics

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Measurement of CP observables in B±→DCPK± decays and constraints on the CKM angle γ — Research Paper | ScholarLens