Observation of CP violation in the B-0 meson system

Aubert, B; Boutigny, D; Gaillard, Jm; Hicheur, A; Karyotakis, Y; Lees, Jp; Robbe, P; Tisserand, V; Palano, A; Chen, Gp; Chen, Jc; Qi, Nd; Rong, G; Wang, P; Zhu, Ys; Eigen, G; Reinertsen, Pl; Stugu, B; Abbott, B; Abrams, Gs; Borgland, Aw; Breon, Ab; Brown, Dn; Button Shafer, J; Cahn, Rn; Clark, Ar; Gill, Ms; Gritsan, Av; Groysman, Y; Jacobsen, Rg; Kadel, Rw; Kadyk, J; Kerth, Lt; Kluth, S; Kolomensky, Yg; Kral, Jf; LeClerc, C; Levi, Me; Liu, T; Lynch, G; Meyer, Ab; Momayezi, M; Oddone, Pj; Perazzo, A; Pripstein, M; Roe, Na; Romosan, A; Ronan, Mt; Shelkov, Vg; Telnov, Av; Wenzel, Wa; Zisman, Ms; Bright Thomas PG,; Harrison, Tj; Hawkes, Cm; Knowles, Dj; O'Neale, Sw; Penny, Rc; Watson, At; Watson, Nk; Deppermann, T; Goetzen, K; Koch, H; Krug, J; Kunze, M; Lewandowski, B; Peters, K; Schmuecker, H; Steinke, M; Andress, Jc; Barlow, Nr; Bhimji, W; Chevalier, N; Clark, Pj; Cottingham, Wn; De Groot, N; Dyce, N; Foster, B; McFall, Jd; Wallom, D; Wilson, Ff; Abe, K; Hearty, C; Mattison, Ts; McKenna, Ja; Thiessen, D; Jolly, S; McKemey, Ak; Tinslay, J; Blinov, Ve; Bukin, Ad; Bukin, Da; Buzykaev, Ar; Golubev, Vb; Ivanchenko, Vn; Korol, Aa; Kravchenko, Ea; Onuchin, Ap; Salnikov, Aa; Serednyakov, Si; Skovpen, Yl; Telnov, Vi; Yushkov, An; Best, D; Lankford, Aj; Mandelkern, M; McMahon, S; Stoker, Dp; Ahsan, A; Arisaka, K; Buchanan, C; Chun, S; Branson, Jg; MacFarlane, Db; Prell, S; Rahatlou, S; Raven, G; Sharma, V; Campagnari, C; Dahmes, B; Hart, Pa; Kuznetsova, N; Levy, Sl; Long, O; Lu, A; Richman, Jd; Verkerke, W; Witherell, M; Yellin, S; Beringer, J; Dorfan, De; Eisner, Am; Frey, A; Grillo, Aa; Grothe, M; Heusch, Ca; Johnson, Rp; Kroeger, W; Lockman, Ws; Pulliam, T; Sadrozinski, H; Schalk, T; Schmitz, Re; Schumm, Ba; Seiden, A; Turri, M; Walkowiak, W; Williams, Dc; Wilson, Mg; Chen, E; Dubois Felsmann GP,; Dvoretskii, A; Hitlin, Dg; Metzler, S; Oyang, J; Porter, Fc; Ryd, A; Samuel, A; Weaver, M; Yang, S; Zhu, Ry; Devmal, S; Geld, Tl; Jayatilleke, S; Mancinelli, G; Meadows, Bt; Sokoloff, Md; 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Parodi, R; Passaggio, S; Pastore, Fc; Patrignani, C; Pia, Mg; Priano, C; Robutti, E; Santroni, A; Morii, M; Bartoldus, R; Dignan, T; Hamilton, R; Mallik, U; Cochran, J; Crawley, Hb; Fischer, Ra; Lamsa, J; Meyer, Wt; Rosenberg, Ei; Benkebil, M; Grosdidier, G; Hast, C; Hocker, A; Lacker, Hm; Laplace, S; Lepeltier, V; Lutz, Am; Plaszczynski, S; Schune, Mh; Trincaz Duvoid, S; Valassi, A; Wormser, G; Bionta, Rm; Brigljevic, V; Lange, Dj; Mugge, M; Shi, X; van Bibber, K; Wenaus, Tj; Wright, Dm; Wuest, Cr; Carroll, M; Fry, Jr; Gabathuler, E; Gamet, R; George, M; Kay, M; Payne, Dj; Sloane, Rj; Touramanis, C; Aspinwall, Ml; Bowerman, Da; Dauncey, Pd; Egede, U; Eschrich, E; Gunawardane, Njw; Nash, Ja; Sanders, P; Smith, D; Azzopardi, De; Back, Jj; Dixon, P; Harrison, Pf; Potter, Rjl; Shorthouse, Hw; Strother, P; Vidal, Pb; Williams, Mi; Cowan, G; George, S; Green, Mg; Kurup, A; Marker, Ce; McGrath, P; McMahon, Tr; Ricciardi, S; Salvatore, F; Scott, I; Vaitsas, G; Brown, D; Davis, Cl; Allison, J; 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doi:10.1103/PhysRevLett.87.091801

We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Y(4S) decays collected in 2001, bringing the data available to 32 x 10(6) B (B) over bar pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59 +/-0.14(stat) +/-0.05(syst) establishes CP violation in the B-0 meson system. We also determine \ gimel \ = 0.93 +/-0.09(stat) +/-0.03(syst), consistent with no direct CP violation.

Titolo:	Observation of CP violation in the B-0 meson system
Autori:	Aubert B Boutigny D Gaillard JM Hicheur A Karyotakis Y Lees JP Robbe P Tisserand V Palano A Chen GP Chen JC Qi ND Rong G Wang P Zhu YS Eigen G Reinertsen PL Stugu B Abbott B Abrams GS Borgland AW Breon AB Brown DN Button Shafer J Cahn RN Clark AR Gill MS Gritsan AV Groysman Y Jacobsen RG Kadel RW Kadyk J Kerth LT Kluth S Kolomensky YG Kral JF LeClerc C Levi ME Liu T Lynch G Meyer AB Momayezi M Oddone PJ Perazzo A Pripstein M Roe NA Romosan A Ronan MT Shelkov VG Telnov AV Wenzel WA Zisman MS Bright Thomas PG Harrison TJ Hawkes CM Knowles DJ O'Neale SW Penny RC Watson AT Watson NK Deppermann T Goetzen K Koch H Krug J Kunze M Lewandowski B Peters K Schmuecker H Steinke M Andress JC Barlow NR Bhimji W Chevalier N Clark PJ Cottingham WN De Groot N Dyce N Foster B McFall JD Wallom D Wilson FF Abe K Hearty C Mattison TS McKenna JA Thiessen D Jolly S McKemey AK Tinslay J Blinov VE Bukin AD Bukin DA Buzykaev AR Golubev VB Ivanchenko VN Korol AA Kravchenko EA Onuchin AP Salnikov AA Serednyakov SI Skovpen YL Telnov VI Yushkov AN Best D Lankford AJ Mandelkern M McMahon S Stoker DP Ahsan A Arisaka K Buchanan C Chun S Branson JG MacFarlane DB Prell S Rahatlou S Raven G Sharma V Campagnari C Dahmes B Hart PA Kuznetsova N Levy SL Long O Lu A Richman JD Verkerke W Witherell M Yellin S Beringer J Dorfan DE Eisner AM Frey A Grillo AA Grothe M Heusch CA Johnson RP Kroeger W Lockman WS Pulliam T Sadrozinski H Schalk T Schmitz RE Schumm BA Seiden A Turri M Walkowiak W Williams DC Wilson MG Chen E Dubois Felsmann GP Dvoretskii A Hitlin DG Metzler S Oyang J Porter FC Ryd A Samuel A Weaver M Yang S Zhu RY Devmal S Geld TL Jayatilleke S Mancinelli G Meadows BT Sokoloff MD Barillari T Bloom P Dima MO Fahey S Ford WT Johnson DR Nauenberg U Olivas A Park H Rankin P Roy J Sen S Smith JG van Hoek WC Wagner DL Blouw J Harton JL Krishnamurthy M Soffer A Toki WH Wilson RJ Zhang J Brandt T Brose J Colberg T Dahlinger G Dickopp M Dubitzky RS Hauke A Maly E Muller Pfefferkorn R Otto S Schubert KR Schwierz R Spaan B Wilden L Behr L Bernard D Bonneaud GR Brochard F Cohen Tanugi J Ferrag S Roussot E T'Jampens S Thiebaux C Vasileiadis G Verderi M Anjomshoaa A Bernet R Khan A Lavin D Muheim F Playfer S Swain JE Falbo M Borean C Bozzi C Dittongo S Folegani M Piemontese L Treadwell E Anulli F Baldini Ferroli R Calcaterra A de Sangro R Falciai D Finocchiaro G Patteri P Peruzzi IM Piccolo M Xie Y Zallo A Bagnasco S Buzzo A Contri R Crosetti G Fabbricatore P Farinon S Lo Vetere M Macri M Monge MR Musenich R Pallavicini M Parodi R Passaggio S Pastore FC Patrignani C Pia MG Priano C Robutti E Santroni A Morii M Bartoldus R Dignan T Hamilton R Mallik U Cochran J Crawley HB Fischer RA Lamsa J Meyer WT Rosenberg EI Benkebil M Grosdidier G Hast C Hocker A Lacker HM Laplace S Lepeltier V Lutz AM Plaszczynski S Schune MH Trincaz Duvoid S Valassi A Wormser G Bionta RM Brigljevic V Lange DJ Mugge M Shi X van Bibber K Wenaus TJ Wright DM Wuest CR Carroll M Fry JR Gabathuler E Gamet R George M Kay M Payne DJ Sloane RJ Touramanis C Aspinwall ML Bowerman DA Dauncey PD Egede U Eschrich E Gunawardane NJW Nash JA Sanders P Smith D Azzopardi DE Back JJ Dixon P Harrison PF Potter RJL Shorthouse HW Strother P Vidal PB Williams MI Cowan G George S Green MG Kurup A Marker CE McGrath P McMahon TR Ricciardi S Salvatore F Scott I Vaitsas G Brown D Davis CL Allison J Barlow RJ Boyd JT Forti AC Fullwood J Jackson F Lafferty GD Savvas N Simopoulos ET Weatherall JH Farbin A Jawahery A Lillard V Olsen J Roberts DA Schieck JR Blaylock G Dallapiccola C Flood KT Hertzbach SS Kofler R Moore TB Staengle H Willocq S Brau B Cowan R Sciolla G Taylor F Yamamoto RK Milek M Patel PM Trischuk J Lanni F Palombo F Bauer JM Booke M Cremaldi L Eschenburg V Kroeger R Reidy J Sanders DA Summers DJ Martin JP Nief JY Seitz R Taras P Zacek V Nicholson H Sutton CS Cartaro C Cavallo N De Nardo G Fabozzi F Gatto C Lista L Paolucci P Piccolo D Sciacca C LoSecco JM Alsmiller JRG Gabriel TA Handler T Brau J Frey R Iwasaki M Sinev NB 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 Vaissiere C Del Buono L Hamon O Le Diberder F Leruste P Lory J Roos L Stark J Versille S Manfredi PF Re V Speziali V Frank ED Gladney L Guo QH Panetta JH Angelini C Batignani G Bettarini S Bondioli M Carpinelli M Forti F Giorgi MA LUSIANI, Alberto [Membro del Collaboration Group] 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 DE Albert J Bula C Elmer P Lu C McDonald KT Miftakov V Schaffner SF Smith AJS Tumanov A Varnes EW Cavoto G del Re D Faccini R Ferrarotto F Ferroni F Fratini K Lamanna E Leonardi E Mazzoni MA Morganti S Piredda G Tehrani FS Serra M Voena C Christ S Waldi R Adye T Franek B Geddes NI Gopal GP Xella SM Aleksan R De Domenico G Emery S Gaidot A Ganzhur SF Giraud PF de Monchenault GH Kozanecki W Langer M London GW Mayer B Serfass B Vasseur G Yeche C Zito M Copty N Purohit MV Singh H Yumiceva FX Adam I Anthony PL Aston D Baird K Berger JP Bloom E Boyarski AM Bulos F Calderini G Claus R Convery MR Coupal DP Coward DH Dorfan J Doser M Dunwoodie W Field RC Glanzman T Godfrey GL Gowdy SJ Grosso P Himel T Hryn'ova T Huffer ME Innes WR Jessop CP Kelsey MH Kim P Kocian ML Langenegger U Leith DWGS Luitz S Luth V Lynch HL Marsiske H Menke S Messner R Moffeit KC Mount R Muller DR O'Grady CP Perl M Petrak S Quinn H Ratcliff BN Robertson SH Rochester LS Roodman A Schietinger T Schindler RH Schwiening J Seeman JT Serbo VV Snyder A Soha A Spanier SM Stelzer J Su D Sullivan MK Tanaka HA Va'vra J Wagner SR Weinstein AJR Wienands U Wisniewski WJ Wright DH Young CC Burchat PR Cheng CH Kirkby D Meyer TI Roat C Henderson R Bugg W Cohn H Weidemann AW Izen JM Kitayama I Lou XC Turcotte M Bianchi F Bona M Di Girolamo B Gamba D Smol A Zanin D Bosisio L Della Ricca G Lanceri L Pompili A Poropat P Vuagnin G Panvini RS Brown CM De Silva A Kowalewski R Roney JM Band HR Charles E Dasu S Di Lodovico F Eichenbaum AM Hu H Johnson JR Liu R Nielsen J Pan Y Prepost R Scott IJ Sekula SJ von Wimmersperg Toeller JH Wu SL Yu Z Zobernig H Kordich TMB Neal H. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2001
Rivista:	PHYSICAL REVIEW LETTERS
Abstract:	We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Y(4S) decays collected in 2001, bringing the data available to 32 x 10(6) B (B) over bar pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59 +/-0.14(stat) +/-0.05(syst) establishes CP violation in the B-0 meson system. We also determine \ gimel \ = 0.93 +/-0.09(stat) +/-0.03(syst), consistent with no direct CP violation.
Handle:	http://hdl.handle.net/11384/4494
Appare nelle tipologie:	1.1 Articolo in rivista

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