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Phys Rev Lett. 2002 Nov 11;89(20):201802. Epub 2002 Oct 29.

Measurement of the CP asymmetry amplitude sin2beta with B0 mesons.

Aubert B, Boutigny D, Gaillard JM, Hicheur A, Karyotakis Y, Lees JP, Robbe P, Tisserand V, Zghiche A, Palano A, Pompili A, Chen JC, Qi ND, Rong G, Wang P, Zhu YS, Eigen G, Ofte I, Stugu B, Abrams GS, Borgland AW, Breon AB, Brown DN, Button-Shafer J, Cahn RN, Charles E, Gill MS, Gritsan AV, Groysman Y, Jacobsen RG, Kadel RW, Kadyk J, Kerth LT, Kolomensky YG, Kral JF, LeClerc C, Levi ME, Lynch G, Mir LM, Oddone PJ, Orimoto TJ, Pripstein M, Roe NA, Romosan A, Ronan MT, Shelkov VG, Telnov AV, Wenzel WA, Harrison TJ, Hawkes CM, Knowles DJ, O'Neale SW, Penny RC, Watson AT, Watson NK, Deppermann T, Goetzen K, Koch H, Lewandowski B, Peters K, Schmuecker H, Steinke M, Barlow NR, Bhimji W, Boyd JT, Chevalier N, Clark PJ, Cottingham WN, Mackay C, Wilson FF, Abe K, Hearty C, Mattison TS, McKenna JA, Thiessen D, Jolly S, McKemey AK, Blinov VE, Bukin AD, Buzykaev AR, Golubev VB, Ivanchenko VN, Korol AA, Kravchenko EA, Onuchin AP, Serednyakov SI, Skovpen YI, Yushkov AN, Best D, Chao M, Kirkby D, Lankford AJ, Mandelkern M, McMahon S, Stoker DP, Buchanan C, Chun S, Hadavand HK, Hill EJ, MacFarlane DB, Paar H, Prell S, Rahatlou Sh, Raven G, Schwanke U, Sharma V, Berryhill JW, Campagnari C, Dahmes B, Hart PA, Kuznetsova N, Levy SL, Long O, Lu A, Mazur MA, Richman JD, Verkerke W, Beringer J, Eisner AM, Grothe M, Heusch CA, Lockman WS, Pulliam T, 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, Porter FC, Ryd A, Samuel A, Yang S, Jayatilleke S, Mancinelli G, Meadows BT, Sokoloff MD, Barillari T, Bloom P, Ford WT, Nauenberg U, Olivas A, Rankin P, Roy J, Smith JG, van Hoek WC, Zhang L, Harton JL, Hu T, Krishnamurthy M, Soffer A, Toki WH, Wilson RJ, Zhang J, Altenburg D, Brandt T, Brose J, Colberg T, Dickopp M, Dubitzky RS, Hauke A, Maly E, Müller-Pfefferkorn R, Otto S, Schubert KR, Schwierz R, Spaan B, Wilden L, Bernard D, Bonneaud GR, Brochard F, Cohen-Tanugi J, Ferrag S, T'Jampens S, Thiebaux Ch, Vasileiadis G, Verderi M, Anjomshoaa A, Bernet R, Khan A, Lavin D, Muheim F, Playfer S, Swain JE, Tinslay J, Falbo M, Borean C, Bozzi C, Piemontese L, Sarti A, Treadwell E, Anulli F, Baldini-Ferroli R, Calcaterra A, de Sangro R, Falciai D, Finocchiaro G, Patteri P, Peruzzi IM, Piccolo M, Zallo A, Bagnasco S, Buzzo A, Contri R, Crosetti G, Lo Vetere M, Macri M, Monge MR, Passaggio S, Pastore FC, Patrignani C, Robutti E, Santroni A, Tosi S, Bailey S, Morii M, Bartoldus R, Grenier GJ, Mallik U, Cochran J, Crawley HB, Lamsa J, Meyer WT, Rosenberg EI, Yi J, Davier M, Grosdidier G, Höcker A, Lacker HM, Laplace S, Le Diberder F, Lepeltier V, Lutz AM, Petersen TC, Plaszczynski S, Schune MH, Tantot L, Trincaz-Duvoid S, Wormser G, Bionta RM, Brigljević V, Lange DJ, van Bibber K, Wright DM, Bevan AJ, 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, Morton GW, Nash JA, Sanders P, Smith D, Taylor GP, Back JJ, Bellodi G, Dixon P, Harrison PF, Potter RJ, Shorthouse HW, Strother P, Vidal PB, Cowan G, Flaecher HU, George S, Green MG, Kurup A, Marker CE, McMahon TR, Ricciardi S, Salvatore F, Vaitsas G, Winter MA, Brown D, Davis CL, Allison J, Barlow RJ, Forti AC, Jackson F, Lafferty GD, Lyon AJ, Savvas N, Weatherall JH, Williams JC, Farbin A, Jawahery A, Lillard V, Roberts DA, Schieck JR, Blaylock G, Dallapiccola C, Flood KT, Hertzbach SS, Kofler R, Koptchev VB, Moore TB, Staengle H, Willocq S, Brau B, Cowan R, Sciolla G, Taylor F, Yamamoto RK, Milek M, Patel PM, Palombo F, Bauer JM, Cremaldi L, Eschenburg V, Kroeger R, Reidy J, Sanders DA, Summers DJ, Hast C, Taras P, Nicholson H, 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, Brau J, Frey R, Iwasaki M, Potter CT, Sinev NB, Strom D, Torrence E, Colecchia F, Dorigo A, Galeazzi F, Margoni M, Morandin M, Posocco M, Rotondo M, Simonetto F, Stroili R, Voci C, Benayoun M, Briand H, Chauveau J, David P, de la Vaissière Ch, Del Buono L, Hamon O, Leruste P, Ocariz J, Pivk M, Roos L, Stark J, Manfredi PF, Re V, Speziali V, Gladney L, Guo QH, Panetta J, Angelini C, Batignani G, Bettarini S, Bondioli M, Bucci F, Calderini G, Campagna E, Carpinelli M, Forti F, Giorgi MA, Lusiani A, Marchiori G, Martinez-Vidal F, Morganti M, Neri N, Paoloni E, Rama M, Rizzo G, Sandrelli F, Triggiani G, Walsh J, Haire M, Judd D, Paick K, Turnbull L, Wagoner DE, Albert J, Danielson N, Elmer P, Lu C, Miftakov V, Olsen J, Schaffner SF, Smith AJ, Tumanov A, Varnes EW, Bellini F, Cavoto G, del Re D, Faccini R, Ferrarotto F, Ferroni F, Leonardi E, Mazzoni MA, Morganti S, Piredda G, Safai Tehrani F, Serra M, Voena C, Christ S, Wagner G, Waldi R, Adye T, De Groot N, Franek B, Geddes NI, Gopal GP, Xella SM, Aleksan R, Emery S, Gaidot A, Giraud PF, Hamel de Monchenault G, Kozanecki W, Langer M, London GW, Mayer B, Schott G, Serfass B, Vasseur G, Yeche Ch, Zito M, Purohit MV, Weidemann AW, Yumiceva FX, Adam I, Aston D, Berger N, Boyarski AM, Convery MR, Coupal DP, Dong D, Dorfan J, Dunwoodie W, Field RC, Glanzman T, Gowdy SJ, Grauges E, Haas T, Hadig T, Halyo V, Himel T, Hryn'ova T, Huffer ME, Innes WR, Jessop CP, Kelsey MH, Kim P, Kocian ML, Langenegger U, Leith DW, Luitz S, Luth V, Lynch HL, Marsiske H, Menke S, Messner R, Muller DR, O'Grady CP, Ozcan VE, Perazzo A, Perl M, Petrak S, Quinn H, Ratcliff BN, Robertson SH, Roodman A, Salnikov AA, Schietinger T, Schindler RH, Schwiening J, Simi G, Snyder A, Soha A, Spanier SM, Stelzer J, Su D, Sullivan MK, Tanaka HA, Va'vra J, Wagner SR, Weaver M, Weinstein AJ, Wisniewski WJ, Wright DH, Young CC, Burchat PR, Cheng CH, Meyer TI, Roat C, Henderson R, Bugg W, Cohn H, Izen JM, Kitayama I, Lou XC, Bianchi F, Bona M, Gamba D, Bosisio L, Della Ricca G, Dittongo S, Lanceri L, Poropat P, Vitale L, Vuagnin G, Panvini RS, Banerjee S, Brown CM, Fortin D, Jackson PD, Kowalewski R, Roney JM, Band HR, Dasu S, Datta M, Eichenbaum AM, Hu H, Johnson JR, Liu R, Di Lodovico F, Mohapatra A, Pan Y, Prepost R, Scott IJ, Sekula SJ, von Wimmersperg-Toeller JH, Wu J, Wu SL, Yu Z, Neal H; BABAR Collaboration.

Abstract

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

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