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Phys Rev Lett. 2001 Aug 27;87(9):091801. Epub 2001 Aug 14.

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 YI, 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, Müller-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 PA, Lamsa J, Meyer WT, Rosenberg EI, Benkebil M, Grosdidier G, Hast C, Höcker A, Lacker HM, Laplace S, Lepeltier V, Lutz AM, Plaszczynski S, Schune MH, Trincaz-Duvoid S, Valassi A, Wormser G, Bionta RM, Brigljević 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 I, Gunawardane NJ, Nash JA, Sanders P, Smith D, Azzopardi DE, Back JJ, Dixon P, Harrison PF, Potter RJ, 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 JR, 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 Vaissière C, Del Buono L, Hamon O, Le Diberder F, Leruste P, Lory J, Roos L, Stark J, Versillé 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 A, 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 AJ, 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, Safai Tehrani F, 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, Hamel De Monchenault G, Kozanecki W, Langer M, London GW, Mayer B, Serfass B, Vasseur G, Yèche 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, Dorser 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, Langennegger U, Leith DW, 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 SR, Soha A, Spanier SM, Stelzer J, Su D, Sullivan MK, Tanaka HA, Va'vra J, Wagner SR, Weinstein AJ, 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, DiGirolamo B, Gamba D, Smol A, Zanin D, Bosisio L, Della Ricci 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, Zobernig H, Kordich TM, Neal H; BABAR Collaboration.

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 Upsilon(4S) decays collected in 2001, bringing the data available to 32 x 10(6) BB macro 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 absolute value of lambda = 0.93+/-0.09(stat)+/-0.03(syst), consistent with no direct CP violation.

PMID:
11531560
DOI:
10.1103/PhysRevLett.87.091801
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