Measurement of CP - Asymmetries for the Decays

Using a sample of 227 million Υ (4S) → BB events collected with the BABAR detector at the PEP-II B Factory in 1999–2004, we study B → D0 K (892) decays where K → K0 S π and D0 → K π+, K π+ π0, K π+ π+ π (non-CP final states), K+K−, π+ π (CP+ eigenstates), K0 S π0, K0 S φ and K0 S ω (CP− eigenstates). The partial rate charge asymmetries ACP and the ratios RCP defined in the literature as the sum of the B+ and B partial rates to a charged K and a D0 CP -eigenstate divided by the B → D0 K decay rate, are sensitive to the angle γ of the CKM unitarity triangle. We measure: ACP+ = −0.09 ± 0.20(stat.) ± 0.06(syst.) ACP− = −0.33 ± 0.34(stat.) ± 0.10(syst.) (+1.15 ± 0.12) · (ACP− −ACP+) RCP+ = +1.77 ± 0.37(stat.) ± 0.12(syst.) RCP− = +0.76 ± 0.29(stat.) ± 0.06(syst.) − 0.04 − 0.14 The third uncertainty quoted for the CP− measurements reflects possible interference effects in the final states with φ and ω resonances. All results are preliminary. Submitted to the 32nd International Conference on High-Energy Physics, ICHEP 04, 16 August—22 August 2004, Beijing, China Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 Work supported in part by Department of Energy contract DE-AC03-76SF00515. The BABAR Collaboration, B. Aubert, R. Barate, D. Boutigny, F. Couderc, J.-M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, V. Tisserand, A. Zghiche Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France A. Palano, A. Pompili Università di Bari, Dipartimento di Fisica and INFN, I-70126 Bari, Italy J. C. Chen, N. D. Qi, G. Rong, P. Wang, Y. S. Zhu Institute of High Energy Physics, Beijing 100039, China G. Eigen, I. Ofte, B. Stugu University of Bergen, Inst. of Physics, N-5007 Bergen, Norway G. S. Abrams, A. W. Borgland, A. B. Breon, D. N. Brown, J. Button-Shafer, R. N. Cahn, E. Charles, C. T. Day, M. S. Gill, A. V. Gritsan, Y. Groysman, R. G. Jacobsen, R. W. Kadel, J. Kadyk, L. T. Kerth, Yu. G. Kolomensky, G. Kukartsev, G. Lynch, L. M. Mir, P. J. Oddone, T. J. Orimoto, M. Pripstein, N. A. Roe, M. T. Ronan, V. G. Shelkov, W. A. Wenzel Lawrence Berkeley National Laboratory and University of California, Berkeley, CA 94720, USA M. Barrett, K. E. Ford, T. J. Harrison, A. J. Hart, C. M. Hawkes, S. E. Morgan, A. T. Watson University of Birmingham, Birmingham, B15 2TT, United Kingdom M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, M. Steinke Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany J. T. Boyd, N. Chevalier, W. N. Cottingham, M. P. Kelly, T. E. Latham, F. F. Wilson University of Bristol, Bristol BS8 1TL, United Kingdom T. Cuhadar-Donszelmann, C. Hearty, N. S. Knecht, T. S. Mattison, J. A. McKenna, D. Thiessen University of British Columbia, Vancouver, BC, Canada V6T 1Z1 A. Khan, P. Kyberd, L. Teodorescu Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom A. E. Blinov, V. E. Blinov, V. P. Druzhinin, V. B. 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Tosi Università di Genova, Dipartimento di Fisica and INFN, I-16146 Genova, Italy S. Bailey, G. Brandenburg, K. S. Chaisanguanthum, M. Morii, E. Won Harvard University, Cambridge, MA 02138, USA R. S. Dubitzky, U. Langenegger Universität Heidelberg, Physikalisches Institut, Philosophenweg 12, D-69120 Heidelberg, Germany W. Bhimji, D. A. Bowerman, P. D. Dauncey, U. Egede, J. R. Gaillard, G. W. Morton, J. A. Nash, M. B. Nikolich, G. P. Taylor Imperial College London, London, SW7 2AZ, United Kingdom M. J. Charles, G. J. Grenier, U. Mallik University of Iowa, Iowa City, IA 52242, USA J. Cochran, H. B. Crawley, J. Lamsa, W. T. Meyer, S. Prell, E. I. Rosenberg, A. E. Rubin, J. Yi Iowa State University, Ames, IA 50011-3160, USA M. Biasini, R. Covarelli, M. Pioppi Università di Perugia, Dipartimento di Fisica and INFN, I-06100 Perugia, Italy M. Davier, X. Giroux, G. Grosdidier, A. Höcker, S. Laplace, F. Le Diberder, V. Lepeltier, A. M. Lutz, T. C. Petersen, S. Plaszczynski, M. H. Schune, L. Tantot, G. Wormser Laboratoire de l’Accélérateur Linéaire, F-91898 Orsay, France C. H. Cheng, D. J. Lange, M. C. Simani, D. M. Wright Lawrence Livermore National Laboratory, Livermore, CA 94550, USA A. J. Bevan, C. A. Chavez, J. P. Coleman, I. J. Forster, J. R. Fry, E. Gabathuler, R. Gamet, D. E. Hutchcroft, R. J. Parry, D. J. Payne, R. J. Sloane, C. Touramanis University of Liverpool, Liverpool L69 72E, United Kingdom J. J. Back, C. M. Cormack, P. F. Harrison, F. Di Lodovico, G. B. Mohanty Queen Mary, University of London, E1 4NS, United Kingdom C. L. Brown, G. Cowan, R. L. Flack, H. U. Flaecher, M. G. Green, P. S. Jackson, T. R. McMahon, S. Ricciardi, F. Salvatore, M. A. Winter University of London, Royal Holloway and Bedford New College, Egham, Surrey TW20 0EX, United Kingdom D. Brown, C. L. Davis University of Louisville, Louisville, KY 40292, USA Now at Department of Physics, University of Warwick, Coventry, United Kingdom J. Allison, N. R. Barlow, R. J. Barlow, P. A. Hart, M. C. Hodgkinson, G. D. Lafferty, A. J. Lyon, J. C. Williams University of Manchester, Manchester M13 9PL, United Kingdom A. Farbin, W. D. Hulsbergen, A. Jawahery, D. Kovalskyi, C. K. Lae, V. Lillard, D. A. Roberts University of Maryland, College Park, MD 20742, USA G. Blaylock, C. Dallapiccola, K. T. Flood, S. S. Hertzbach, R. Kofler, V. B. Koptchev, T. B. Moore, S. Saremi, H. Staengle, S. Willocq University of Massachusetts, Amherst, MA 01003, USA R. Cowan, G. Sciolla, S. J. Sekula, F. Taylor, R. K. Yamamoto Massachusetts Institute of Technology, Laboratory for Nuclear Science, Cambridge, MA 02139, USA D. J. J. Mangeol, P. M. Patel, S. H. Robertson McGill University, Montréal, QC, Canada H3A 2T8 A. Lazzaro, V. Lombardo, F. Palombo Università di Milano, Dipartimento di Fisica and INFN, I-20133 Milano, Italy J. M. Bauer, L. Cremaldi, V. Eschenburg, R. Godang, R. Kroeger, J. Reidy, D. A. Sanders, D. J. Summers, H. W. Zhao University of Mississippi, University, MS 38677, USA S. Brunet, D. Côté, P. Taras Université de Montréal, Laboratoire René J. A. Lévesque, Montréal, QC, Canada H3C 3J7 H. Nicholson Mount Holyoke College, South Hadley, MA 01075, USA N. Cavallo, F. Fabozzi, C. Gatto, L. Lista, D. Monorchio, P. Paolucci, D. Piccolo, C. Sciacca Università di Napoli Federico II, Dipartimento di Scienze Fisiche and INFN, I-80126, Napoli, Italy M. Baak, H. Bulten, G. Raven, H. L. Snoek, L. Wilden NIKHEF, National Institute for Nuclear Physics and High Energy Physics, NL-1009 DB Amsterdam, The Netherlands C. P. Jessop, J. M. LoSecco University of Notre Dame, Notre Dame, IN 46556, USA T. Allmendinger, K. K. Gan, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. Pulliam, A. M. Rahimi, R. Ter-Antonyan, Q. K. Wong Ohio State University, Columbus, OH 43210, USA J. Brau, R. Frey, O. Igonkina, C. T. Potter, N. B. Sinev, D. Strom, E. Torrence University of Oregon, Eugene, OR 97403, USA Also with Università della Basilicata, Potenza, Italy F. Colecchia, A. Dorigo, F. Galeazzi, M. Margoni, M. Morandin, M. Posocco, M. Rotondo, F. Simonetto, R. Stroili, G. Tiozzo, C. Voci Università di Padova, Dipartimento di Fisica and INFN, I-35131 Padova, Italy M. Benayoun, H. Briand, J. Chauveau, P. David, Ch. de la Vaissière, L. Del Buono, O. Hamon, M. J. J. John, Ph. Leruste, J. Malcles, J. Ocariz, M. Pivk, L. Roos, S. T’Jampens, G. Therin Universités Paris VI et VII, Laboratoire de Physique Nucléaire et de Hautes Energies, F-75252 Paris, France P. F. Manfredi, V. Re Università di Pavia, Dipartimento di Elettronica and INFN, I-27100 Pavia, Italy P. K. Behera, L. Gladney, Q. H. Guo, J. Panetta University of Pennsylvania, Philadelphia, PA 19104, USA C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bucci, G. Calderini, M. Carpinelli, F. Forti, M. A. Giorgi, A. Lusiani, G. Marchiori, F. Martinez-Vidal, M. Morganti, N. Neri, E. Paoloni, M. Rama, G. Rizzo, F. Sandrelli, J. 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Yèche, M. Zito DSM/Dapnia, CEA/Saclay, F-91191 Gif-sur-Yvette, France M. V. Purohit, A. W. Weidemann, J. R. Wilson, F. X. Yumiceva University of South Carolina, Columbia, SC 29208, USA D. Aston, R. Bartoldus, N. Berger, A. M. Boyarski, O. L. Buchmueller, R. Claus, M. R. Convery, M. Cristinziani, G. De Nardo, D. Dong, J. Dorfan, D. Dujmic, W. Dunwoodie, E. E. Elsen, S. Fan, R. C. Field, T. Glanzman, S. J. Gowdy, T. Hadig, V. Halyo, C. Hast, T. Hryn’ova, W. R. Innes, Also with IFIC, Instituto de F́ısica Corpuscular, CSIC-Universidad de Valencia, Valencia, Spain Also with Princeton University, Princeton, USA M. H. Kelsey, P. Kim, M. L. Kocian, D. W. G. S. Leith, J. Libby, S. Luitz, V. Luth, H. L. Lynch, H. Marsiske, R. Messner, D. R. Muller, C. P. O’Grady, V. E. Ozcan, A. Perazzo, M. Perl, S. Petrak, B. N. Ratcliff, A. Roodman, A. A. Salnikov, R. H. Schindler, J. Schwiening, G. Simi, A. Snyder, A. Soha, J. Stelzer, D. Su, M. K. Sullivan, J. Va’vra, S. R. Wagner, M. Weaver, A. J. R. 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