Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

Aubert, B.; Boutigny, D.; Gaillard, J.; Hicheur, A.; Karyotakis, Y.; Lees, J.; Robbe, P.; Tisserand, V.; Palano, A.; Pompili, A.; Chen, G.; Chen, J.; Qi, N.; Rong, G.; Wang, P.; Zhu, Y.; Eigen, G.; Stugu, B.; Abrams, G.; Borgland, A.; Breon, A.; Brown, D.; Button Shafer, J.; Cahn, R.; Clark, A.; Gill, M.; Gritsan, A.; Groysman, Y.; Jacobsen, R.; Kadel, R.; Kadyk, J.; Kerth, L.; Kolomensky, Y.; Kral, J.; Leclerc, C.; Levi, M.; Lynch, G.; Oddone, P.; Pripstein, M.; Roe, N.; Romosan, A.; Ronan, M.; Shelkov, V.; Telnov, A.; Wenzel, W.; Harrison, T.; Hawkes, C.; Knowles, D.; O’Neale, S.; Penny, R.; Watson, A.; Watson, N.; Deppermann, T.; Goetzen, K.; Koch, H.; Kunze, M.; Lewandowski, B.; Peters, K.; Schmuecker, H.; Steinke, M.; Barlow, N.; Bhimji, W.; Chevalier, N.; Clark, P.; Cottingham, W.; Foster, B.; Mackay, C.; Wilson, F.; Abe, K.; Hearty, C.; Mattison, T.; Mckenna, J.; Thiessen, D.; Jolly, S.; Mckemey, A.; Blinov, V.; Bukin, A.; Bukin, D.; Buzykaev, A.; Golubev, V.; Ivanchenko, V.; Korol, A.; Kravchenko, E.; Onuchin, A.; Serednyakov, S.; Skovpen, Y.; Telnov, V.; Yushkov, A.; Best, D.; Chao, M.; Kirkby, D.; Lankford, A.; Mandelkern, M.; Mcmahon, S.; Stoker, D.; Arisaka, K.; Buchanan, C.; Chun, S.; Macfarlane, D.; Prell, S.; Rahatlou, S.; Raven, G.; Sharma, V.; Campagnari, C.; Dahmes, B.; Hart, P.; Kuznetsova, N.; Levy, S.; Long, O.; Lu, A.; Mazur, M.; Richman, J.; Verkerke, W.; Beringer, J.; Eisner, A.; Grothe, M.; Heusch, C.; Lockman, W.; Pulliam, T.; Schalk, T.; Schmitz, R.; Schumm, B.; Seiden, A.; Turri, M.; Walkowiak, W.; Williams, D.; Wilson, M.; Chen, E.; Dubois Felsmann, G.; Dvoretskii, A.; Hitlin, D.; Metzler, S.; Oyang, J.; Porter, F.; Ryd, A.; Samuel, A.; Weaver, M.; Yang, S.; Zhu, R.; Devmal, S.; Geld, T.; Jayatilleke, S.; Mancinelli, G.; Meadows, B.; Sokoloff, M.; Barillari, T.; Bloom, P.; Dima, M.; Ford, W.; Nauenberg, U.; Olivas, A.; Rankin, P.; Roy, J.; Smith, J.; van Hoek, W.; Blouw, J.; Harton, J.; Krishnamurthy, M.; Soffer, A.; Toki, W.; Wilson, R.; Zhang, J.; Brandt, T.; Brose, J.; Colberg, T.; Dickopp, M.; Dubitzky, R.; Hauke, A.; Maly, E.; Müller Pfefferkorn, R.; Otto, S.; Schubert, K.; Schwierz, R.; Spaan, B.; Wilden, L.; Bernard, D.; Bonneaud, G.; Brochard, F.; Cohen Tanugi, J.; Ferrag, S.; T’Jampens, S.; Thiebaux, C.; Vasileiadis, G.; Verderi, M.; Anjomshoaa, A.; Bernet, R.; Khan, A.; Lavin, D.; Muheim, F.; Playfer, S.; Swain, J.; Tinslay, J.; Falbo, M.; Borean, C.; Bozzi, C.; Piemontese, L.; Treadwell, E.; Anulli, F.; Baldini Ferroli, R.; Calcaterra, A.; de Sangro, R.; Falciai, D.; Finocchiaro, G.; Patteri, P.; Peruzzi, I.; Piccolo, M.; Xie, Y.; Zallo, A.; Bagnasco, S.; Buzzo, A.; Contri, R.; Crosetti, G.; Lo Vetere, M.; Macri, M.; Monge, M.; Passaggio, S.; Pastore, F.; Patrignani, C.; Pia, M.; Robutti, E.; Santroni, A.; Tosi, S.; Morii, M.; Bartoldus, R.; Hamilton, R.; Mallik, U.; Cochran, J.; Crawley, H.; Fischer, P.; Lamsa, J.; Meyer, W.; Rosenberg, E.; Grosdidier, G.; Hast, C.; Höcker, A.; Lacker, H.; Laplace, S.; Lepeltier, V.; Lutz, A.; Plaszczynski, S.; Schune, M.; Trincaz Duvoid, S.; Wormser, G.; Bionta, R.; Brigljević, V.; Lange, D.; Mugge, M.; van Bibber, K.; Wright, D.; Bevan, A.; Fry, J.; Gabathuler, E.; Gamet, R.; George, M.; Kay, M.; Payne, D.; Sloane, R.; Touramanis, C.; Aspinwall, M.; Bowerman, D.; Dauncey, P.; Egede, U.; Eschrich, I.; Gunawardane, N.; Nash, J.; Sanders, P.; Smith, D.; Azzopardi, D.; Back, J.; Bellodi, G.; Dixon, P.; Harrison, P.; Potter, R.; Shorthouse, H.; Strother, P.; Vidal, P.; Cowan, G.; George, S.; Green, M.; Kurup, A.; Marker, C.; Mcgrath, P.; Mcmahon, T.; Ricciardi, S.; Salvatore, F.; Vaitsas, G.; Brown, D.; Davis, C.; Allison, J.; Barlow, R.; Boyd, J.; Forti, A.; Fullwood, J.; Jackson, F.; Lafferty, G.; Savvas, N.; Weatherall, J.; Williams, J.; Farbin, A.; Jawahery, A.; Lillard, V.; Olsen, J.; Roberts, D.; Schieck, J.; Blaylock, G.; Dallapiccola, C.; Flood, K.; Hertzbach, S.; Kofler, R.; Koptchev, V.; Moore, T.; Staengle, H.; Willocq, S.; Brau, B.; Cowan, R.; Sciolla, G.; Taylor, F.; Yamamoto, R.; Milek, M.; Patel, P.; Palombo, F.; Bauer, J.; Cremaldi, L.; Eschenburg, V.; Kroeger, R.; Reidy, J.; Sanders, D.; Summers, D.; Nief, J.; Taras, P.; Nicholson, H.; Cartaro, C.; Cavallo, N.; De Nardo, G.; Fabozzi, F.; Gatto, C.; Lista, L.; Paolucci, P.; Piccolo, D.; Sciacca, C.; Losecco, J.; Alsmiller, J.; Gabriel, T.; Brau, J.; Frey, R.; Grauges, E.; Iwasaki, M.; Sinev, N.; Strom, D.; Colecchia, F.; Dal Corso, F.; Dorigo, A.; Galeazzi, F.; Margoni, M.; Michelon, G.; Morandin, M.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Torassa, E.; Voci, C.; Benayoun, M.; Briand, H.; Chauveau, J.; David, P.; de la Vaissière, C.; Del Buono, L.; Hamon, O.; Le Diberder, F.; Leruste, P.; Ocariz, J.; Roos, L.; Stark, J.; Manfredi, P.; Re, V.; Speziali, V.; Frank, E.; Gladney, L.; Guo, Q.; Panetta, J.; Angelini, C.; Batignani, G.; Bettarini, S.; Bondioli, M.; Bucci, F.; Campagna, E.; Carpinelli, M.; Forti, F.; Giorgi, M.; Lusiani, A.; Marchiori, G.; Martinez Vidal, F.; Morganti, M.; Neri, N.; Paoloni, E.; Rama, M.; Rizzo, G.; Sandrelli, F.; Simi, G.; Triggiani, G.; Walsh, J.; Haire, M.; Judd, D.; Paick, K.; Turnbull, L.; Wagoner, D.; Albert, J.; Elmer, P.; Lu, C.; Miftakov, V.; Schaffner, S.; Smith, A.; Tumanov, A.; Varnes, E.; Cavoto, G.; del Re, D.; Ferrarotto, F.; Ferroni, F.; Lamanna, E.; Mazzoni, M.; Morganti, S.; Piredda, G.; Safai Tehrani, F.; Serra, M.; Voena, C.; Faccini, R.; Christ, S.; Waldi, R.; Adye, T.; De Groot, N.; Franek, B.; Geddes, N.; Gopal, G.; Xella, S.; Aleksan, R.; Emery, S.; Gaidot, A.; Ganzhur, S.; Giraud, P.; Hamel de Monchenault, G.; Kozanecki, W.; Langer, M.; London, G.; Mayer, B.; Serfass, B.; Vasseur, G.; Yèche, C.; Zito, M.; Purohit, M.; Singh, H.; Weidemann, A.; Yumiceva, F.; Adam, I.; Aston, D.; Berger, N.; Boyarski, A.; Calderini, G.; Convery, M.; Coupal, D.; Dong, D.; Dorfan, J.; Dunwoodie, W.; Field, R.; Glanzman, T.; Gowdy, S.; Haas, T.; Halyo, V.; Himel, T.; Hryn’Ova, T.; Huffer, M.; Innes, W.; Jessop, C.; Kelsey, M.; Kim, P.; Kocian, M.; Langenegger, U.; Leith, D.; Luitz, S.; Luth, V.; Lynch, H.; Marsiske, H.; Menke, S.; Messner, R.; Muller, D.; O’Grady, C.; Ozcan, V.; Perazzo, A.; Perl, M.; Petrak, S.; Quinn, H.; Ratcliff, B.; Robertson, S.; Roodman, A.; Salnikov, A.; Schietinger, T.; Schindler, R.; Schwiening, J.; Snyder, A.; Soha, A.; Spanier, S.; Stelzer, J.; Su, D.; Sullivan, M.; Tanaka, H.; Va’Vra, J.; Wagner, S.; Weinstein, A.; Wisniewski, W.; Wright, D.; Young, C.; Burchat, P.; Cheng, C.; Meyer, T.; Roat, C.; Henderson, R.; Bugg, W.; Cohn, H.; Izen, J.; Kitayama, I.; Lou, X.; Bianchi, F.; Bona, M.; Gamba, D.; Bosisio, L.; Della Ricca, G.; Dittongo, S.; Lanceri, L.; Poropat, P.; Vuagnin, G.; Panvini, R.; Brown, C.; Jackson, P.; Kowalewski, R.; Roney, J.; Band, H.; Charles, E.; Dasu, S.; Eichenbaum, A.; Hu, H.; Johnson, J.; Liu, R.; Di Lodovico, F.; Pan, Y.; Prepost, R.; Scott, I.; Sekula, S.; von Wimmersperg Toeller, J.; Wu, S.; Yu, Z.; Kordich, T.; Neal, H.

doi:10.1103/PhysRevD.66.032003

We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e +e - collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb -1 recorded at the γ(4S) resonance and 3.9 fb -1 off resonance. One of the neutral B mesons, which are produced in pairs at the γ(4S), is fully reconstructed in the CP decay modes J/ ψK S 0, ψ(2S)K S 0, χ c1K S 0, J/ψK* 0 (K* 0→K S 0π 0) and J/ψK L 0, or in flavor-eigenstate modes involving D (*)π/p/a 1 and J/ψK* 0 (K* 0→K +π -). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural netsvork tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B 0-B̄ 0 oscillation frequency Δm d are measured with a sample of about 6350 fully-reconstructed B 0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δm d=0.516±0.016(stat)±0.010(syst) ps -1. The value of the asymmetry amplitude sin 2β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B 0 decays in the CP-eigenstate modes. We find sin 2β=0.59 ±0.14(stat)±0. 05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0. 93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.

Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S) / B. Aubert, D. Boutigny, J. Gaillard, A. Hicheur, Y. Karyotakis, J. Lees, P. Robbe, V. Tisserand, A. Palano, A. Pompili, G. Chen, J. Chen, N. Qi, G. Rong, P. Wang, Y. Zhu, G. Eigen, B. Stugu, G. Abrams, A. Borgland, A. Breon, D. Brown, J. Button-Shafer, R. Cahn, A. Clark, M. Gill, A. Gritsan, Y. Groysman, R. Jacobsen, R. Kadel, J. Kadyk, L. Kerth, Y. Kolomensky, J. Kral, C. LeClerc, M. Levi, G. Lynch, P. Oddone, M. Pripstein, N. Roe, A. Romosan, M. Ronan, V. Shelkov, A. Telnov, W. Wenzel, T. Harrison, C. Hawkes, D. Knowles, S. O’Neale, R. Penny, A. Watson, N. Watson, T. Deppermann, K. Goetzen, H. Koch, M. Kunze, B. Lewandowski, K. Peters, H. Schmuecker, M. Steinke, N. Barlow, W. Bhimji, N. Chevalier, P. Clark, W. Cottingham, B. Foster, C. Mackay, F. Wilson, K. Abe, C. Hearty, T. Mattison, J. McKenna, D. Thiessen, S. Jolly, A. McKemey, V. Blinov, A. Bukin, D. Bukin, A. Buzykaev, V. Golubev, V. Ivanchenko, A. Korol, E. Kravchenko, A. Onuchin, S. Serednyakov, Y. Skovpen, V. Telnov, A. Yushkov, D. Best, M. Chao, D. Kirkby, A. Lankford, M. Mandelkern, S. McMahon, D. Stoker, K. Arisaka, C. Buchanan, S. Chun, D. MacFarlane, S. Prell, S. Rahatlou, G. Raven, V. Sharma, C. Campagnari, B. Dahmes, P. Hart, N. Kuznetsova, S. Levy, O. Long, A. Lu, M. Mazur, J. Richman, W. Verkerke, J. Beringer, A. Eisner, M. Grothe, C. Heusch, W. Lockman, T. Pulliam, T. Schalk, R. Schmitz, B. Schumm, A. Seiden, M. Turri, W. Walkowiak, D. Williams, M. Wilson, E. Chen, G. Dubois-Felsmann, A. Dvoretskii, D. Hitlin, S. Metzler, J. Oyang, F. Porter, A. Ryd, A. Samuel, M. Weaver, S. Yang, R. Zhu, S. Devmal, T. Geld, S. Jayatilleke, G. Mancinelli, B. Meadows, M. Sokoloff, T. Barillari, P. Bloom, M. Dima, W. Ford, U. Nauenberg, A. Olivas, P. Rankin, J. Roy, J. Smith, W. van Hoek, J. Blouw, J. Harton, M. Krishnamurthy, A. Soffer, W. Toki, R. Wilson, J. Zhang, T. Brandt, J. Brose, T. Colberg, M. Dickopp, R. Dubitzky, A. Hauke, E. Maly, R. Müller-Pfefferkorn, S. Otto, K. Schubert, R. Schwierz, B. Spaan, L. Wilden, D. Bernard, G. Bonneaud, F. Brochard, J. Cohen-Tanugi, S. Ferrag, S. T’Jampens, C. Thiebaux, G. Vasileiadis, M. Verderi, A. Anjomshoaa, R. Bernet, A. Khan, D. Lavin, F. Muheim, S. Playfer, J. Swain, J. Tinslay, M. Falbo, C. Borean, C. Bozzi, L. Piemontese, E. Treadwell, F. Anulli, R. Baldini-Ferroli, A. Calcaterra, R. de Sangro, D. Falciai, G. Finocchiaro, P. Patteri, I. Peruzzi, M. Piccolo, Y. Xie, A. Zallo, S. Bagnasco, A. Buzzo, R. Contri, G. Crosetti, M. Lo Vetere, M. Macri, M. Monge, S. Passaggio, F. Pastore, C. Patrignani, M. Pia, E. Robutti, A. Santroni, S. Tosi, M. Morii, R. Bartoldus, R. Hamilton, U. Mallik, J. Cochran, H. Crawley, P. Fischer, J. Lamsa, W. Meyer, E. Rosenberg, G. Grosdidier, C. Hast, A. Höcker, H. Lacker, S. Laplace, V. Lepeltier, A. Lutz, S. Plaszczynski, M. Schune, S. Trincaz-Duvoid, G. Wormser, R. Bionta, V. Brigljević, D. Lange, M. Mugge, K. van Bibber, D. Wright, A. Bevan, J. Fry, E. Gabathuler, R. Gamet, M. George, M. Kay, D. Payne, R. Sloane, C. Touramanis, M. Aspinwall, D. Bowerman, P. Dauncey, U. Egede, I. Eschrich, N. Gunawardane, J. Nash, P. Sanders, D. Smith, D. Azzopardi, J. Back, G. Bellodi, P. Dixon, P. Harrison, R. Potter, H. Shorthouse, P. Strother, P. Vidal, G. Cowan, S. George, M. Green, A. Kurup, C. Marker, P. McGrath, T. McMahon, S. Ricciardi, F. Salvatore, G. Vaitsas, D. Brown, C. Davis, J. Allison, R. Barlow, J. Boyd, A. Forti, J. Fullwood, F. Jackson, G. Lafferty, N. Savvas, J. Weatherall, J. Williams, A. Farbin, A. Jawahery, V. Lillard, J. Olsen, D. Roberts, J. Schieck, G. Blaylock, C. Dallapiccola, K. Flood, S. Hertzbach, R. Kofler, V. Koptchev, T. Moore, H. Staengle, S. Willocq, B. Brau, R. Cowan, G. Sciolla, F. Taylor, R. Yamamoto, M. Milek, P. Patel, F. Palombo, J. Bauer, L. Cremaldi, V. Eschenburg, R. Kroeger, J. Reidy, D. Sanders, D. Summers, J. Nief, P. Taras, H. Nicholson, C. Cartaro, N. Cavallo, G. De Nardo, F. Fabozzi, C. Gatto, L. Lista, P. Paolucci, D. Piccolo, C. Sciacca, J. LoSecco, J. Alsmiller, T. Gabriel, J. Brau, R. Frey, E. Grauges, M. Iwasaki, N. Sinev, D. Strom, F. Colecchia, F. Dal Corso, A. Dorigo, F. Galeazzi, M. Margoni, G. Michelon, M. Morandin, M. Posocco, M. Rotondo, F. Simonetto, R. Stroili, E. Torassa, C. Voci, M. Benayoun, H. Briand, J. Chauveau, P. David, C. de la Vaissière, L. Del Buono, O. Hamon, F. Le Diberder, P. Leruste, J. Ocariz, L. Roos, J. Stark, P. Manfredi, V. Re, V. Speziali, E. Frank, L. Gladney, Q. Guo, J. Panetta, C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bucci, E. Campagna, M. Carpinelli, F. Forti, M. Giorgi, A. Lusiani, G. Marchiori, F. Martinez-Vidal, M. Morganti, N. Neri, E. Paoloni, M. Rama, G. Rizzo, F. Sandrelli, G. Simi, G. Triggiani, J. Walsh, M. Haire, D. Judd, K. Paick, L. Turnbull, D. Wagoner, J. Albert, P. Elmer, C. Lu, V. Miftakov, S. Schaffner, A. Smith, A. Tumanov, E. Varnes, G. Cavoto, D. del Re, F. Ferrarotto, F. Ferroni, E. Lamanna, M. Mazzoni, S. Morganti, G. Piredda, F. Safai Tehrani, M. Serra, C. Voena, R. Faccini, S. Christ, R. Waldi, T. Adye, N. De Groot, B. Franek, N. Geddes, G. Gopal, S. Xella, R. Aleksan, S. Emery, A. Gaidot, S. Ganzhur, P. Giraud, G. Hamel de Monchenault, W. Kozanecki, M. Langer, G. London, B. Mayer, B. Serfass, G. Vasseur, C. Yèche, M. Zito, M. Purohit, H. Singh, A. Weidemann, F. Yumiceva, I. Adam, D. Aston, N. Berger, A. Boyarski, G. Calderini, M. Convery, D. Coupal, D. Dong, J. Dorfan, W. Dunwoodie, R. Field, T. Glanzman, S. Gowdy, T. Haas, V. Halyo, T. Himel, T. Hryn’ova, M. Huffer, W. Innes, C. Jessop, M. Kelsey, P. Kim, M. Kocian, U. Langenegger, D. Leith, S. Luitz, V. Luth, H. Lynch, H. Marsiske, S. Menke, R. Messner, D. Muller, C. O’Grady, V. Ozcan, A. Perazzo, M. Perl, S. Petrak, H. Quinn, B. Ratcliff, S. Robertson, A. Roodman, A. Salnikov, T. Schietinger, R. Schindler, J. Schwiening, A. Snyder, A. Soha, S. Spanier, J. Stelzer, D. Su, M. Sullivan, H. Tanaka, J. Va’vra, S. Wagner, A. Weinstein, W. Wisniewski, D. Wright, C. Young, P. Burchat, C. Cheng, T. Meyer, C. Roat, R. Henderson, W. Bugg, H. Cohn, J. Izen, I. Kitayama, X. Lou, F. Bianchi, M. Bona, D. Gamba, L. Bosisio, G. Della Ricca, S. Dittongo, L. Lanceri, P. Poropat, G. Vuagnin, R. Panvini, C. Brown, P. Jackson, R. Kowalewski, J. Roney, H. Band, E. Charles, S. Dasu, A. Eichenbaum, H. Hu, J. Johnson, R. Liu, F. Di Lodovico, Y. Pan, R. Prepost, I. Scott, S. Sekula, J. von Wimmersperg-Toeller, S. Wu, Z. Yu, T. Kordich, H. Neal. - In: PHYSICAL REVIEW D. - ISSN 0556-2821. - 66:3(2002).

Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

B. Aubert;D. Boutigny;J. Gaillard;A. Hicheur;Y. Karyotakis;J. Lees;P. Robbe;V. Tisserand;A. Palano;A. Pompili;G. Chen;J. Chen;N. Qi;G. Rong;P. Wang;Y. Zhu;G. Eigen;B. Stugu;G. Abrams;A. Borgland;A. Breon;D. Brown;J. Button Shafer;R. Cahn;A. Clark;M. Gill;A. Gritsan;Y. Groysman;R. Jacobsen;R. Kadel;J. Kadyk;L. Kerth;Y. Kolomensky;J. Kral;C. LeClerc;M. Levi;G. Lynch;P. Oddone;M. Pripstein;N. Roe;A. Romosan;M. Ronan;V. Shelkov;A. Telnov;W. Wenzel;T. Harrison;C. Hawkes;D. Knowles;S. O’Neale;R. Penny;A. Watson;N. Watson;T. Deppermann;K. Goetzen;H. Koch;M. Kunze;B. Lewandowski;K. Peters;H. Schmuecker;M. Steinke;N. Barlow;W. Bhimji;N. Chevalier;P. Clark;W. Cottingham;B. Foster;C. Mackay;F. Wilson;K. Abe;C. Hearty;T. Mattison;J. McKenna;D. Thiessen;S. Jolly;A. McKemey;V. Blinov;A. Bukin;D. Bukin;A. Buzykaev;V. Golubev;V. Ivanchenko;A. Korol;E. Kravchenko;A. Onuchin;S. Serednyakov;Y. Skovpen;V. Telnov;A. Yushkov;D. Best;M. Chao;D. Kirkby;A. Lankford;M. Mandelkern;S. McMahon;D. Stoker;K. Arisaka;C. Buchanan;S. Chun;D. MacFarlane;S. Prell;S. Rahatlou;G. Raven;V. Sharma;C. Campagnari;B. Dahmes;P. Hart;N. Kuznetsova;S. Levy;O. Long;A. Lu;M. Mazur;J. Richman;W. Verkerke;J. Beringer;A. Eisner;M. Grothe;C. Heusch;W. Lockman;T. Pulliam;T. Schalk;R. Schmitz;B. Schumm;A. Seiden;M. Turri;W. Walkowiak;D. Williams;M. Wilson;E. Chen;G. Dubois Felsmann;A. Dvoretskii;D. Hitlin;S. Metzler;J. Oyang;F. Porter;A. Ryd;A. Samuel;M. Weaver;S. Yang;R. Zhu;S. Devmal;T. Geld;S. Jayatilleke;G. Mancinelli;B. Meadows;M. Sokoloff;T. Barillari;P. Bloom;M. Dima;W. Ford;U. Nauenberg;A. Olivas;P. Rankin;J. Roy;J. Smith;W. van Hoek;J. Blouw;J. Harton;M. Krishnamurthy;A. Soffer;W. Toki;R. Wilson;J. Zhang;T. Brandt;J. Brose;T. Colberg;M. Dickopp;R. Dubitzky;A. Hauke;E. Maly;R. Müller Pfefferkorn;S. Otto;K. Schubert;R. Schwierz;B. Spaan;L. Wilden;D. Bernard;G. Bonneaud;F. Brochard;J. Cohen Tanugi;S. Ferrag;S. T’Jampens;C. Thiebaux;G. Vasileiadis;M. Verderi;A. Anjomshoaa;R. Bernet;A. Khan;D. Lavin;F. Muheim;S. Playfer;J. Swain;J. Tinslay;M. Falbo;C. Borean;C. Bozzi;L. Piemontese;E. Treadwell;F. Anulli;R. Baldini Ferroli;A. Calcaterra;R. de Sangro;D. Falciai;G. Finocchiaro;P. Patteri;I. Peruzzi;M. Piccolo;Y. Xie;A. Zallo;S. Bagnasco;A. Buzzo;R. Contri;G. Crosetti;M. Lo Vetere;M. Macri;M. Monge;S. Passaggio;F. Pastore;C. Patrignani;M. Pia;E. Robutti;A. Santroni;S. Tosi;M. Morii;R. Bartoldus;R. Hamilton;U. Mallik;J. Cochran;H. Crawley;P. Fischer;J. Lamsa;W. Meyer;E. Rosenberg;G. Grosdidier;C. Hast;A. Höcker;H. Lacker;S. Laplace;V. Lepeltier;A. Lutz;S. Plaszczynski;M. Schune;S. Trincaz Duvoid;G. Wormser;R. Bionta;V. Brigljević;D. Lange;M. Mugge;K. van Bibber;D. Wright;A. Bevan;J. Fry;E. Gabathuler;R. Gamet;M. George;M. Kay;D. Payne;R. Sloane;C. Touramanis;M. Aspinwall;D. Bowerman;P. Dauncey;U. Egede;I. Eschrich;N. Gunawardane;J. Nash;P. Sanders;D. Smith;D. Azzopardi;J. Back;G. Bellodi;P. Dixon;P. Harrison;R. Potter;H. Shorthouse;P. Strother;P. Vidal;G. Cowan;S. George;M. Green;A. 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2002

Abstract

We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e +e - collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb -1 recorded at the γ(4S) resonance and 3.9 fb -1 off resonance. One of the neutral B mesons, which are produced in pairs at the γ(4S), is fully reconstructed in the CP decay modes J/ ψK S 0, ψ(2S)K S 0, χ c1K S 0, J/ψK* 0 (K* 0→K S 0π 0) and J/ψK L 0, or in flavor-eigenstate modes involving D (*)π/p/a 1 and J/ψK* 0 (K* 0→K +π -). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural netsvork tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B 0-B̄ 0 oscillation frequency Δm d are measured with a sample of about 6350 fully-reconstructed B 0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δm d=0.516±0.016(stat)±0.010(syst) ps -1. The value of the asymmetry amplitude sin 2β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B 0 decays in the CP-eigenstate modes. We find sin 2β=0.59 ±0.14(stat)±0. 05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0. 93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.

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	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/04 - Fisica Nucleare e Subnucleare
		
	Data di pubblicazione
	
			2002
		
	Rivista in ANCE
	
			PHYSICAL REVIEW D
		
	DOI
	
			https://dx.doi.org/10.1103/PhysRevD.66.032003
		
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			Article (author)
		
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			01 - Articolo su periodico

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/184655

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