Measurement ofCP-violating asymmetries inB0→(ρπ)0using a time-dependent Dalitz plot analysis

B Aubert,P C Bloom,G Wormser,K Suzuki,R Bula,J Serrano,A M Lutz,G Kukartsev,G Della Ricca,D Walker,V Halyo,R Godang,V E Blinov,R Claus,R S Dubitzky,W J Wisniewski,F Liu,D Del Re,G Rizzo,M Morganti,I Ofte,J M Losecco,L Lanceri,R Faccini,M Carpinelli,K R Schubert,L Vitale,R Eckmann,A Hauke,J Merkel,F Ferrarotto,H Schröder,T Schalk,M R Convery,A Zallo,F Palombo,S Schenk,M A Mazzoni,A Perazzo,Y P Lau,G Finocchiaro,J Dorfan,M Lu,D A Roberts,K A George,T B Moore,H Kagan,A Lazzaro,M Davier,D Su,G Castelli,D J Bard,V Poireau,N R Barlow,D J Asgeirsson,W N Cottingham,N B Sinev,M Bondioli,S F Ganzhur,D D Altenburg,R Kroeger,S D Foulkes,R Schwierz,I M Peruzzi,A Stocchi,V P Druzhinin,S B Zain,J D Richman,E Ben-Haim,F Bellini,P Roudeau,M Pappagallo,X Prudent,G Eigen,F Le Diberder,M Pelizaeus,M Bruinsma,L M Mir,V Tisserand,C Dallapiccola,R Bartoldus,N Van Bakel,R Prepost,S L Wu,R G Jacobsen,A Chen,H B Crawley,D W G S Leith,A E Rubin,M A Saeed,R L Flack,S M Spanier,X R Chen,B Franek,L Piemontese,P R 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Morandin,V Sharma,J F Hirschauer,M Steinke,N Neri,H A Neal

doi:10.1103/physrevd.76.012004

Abstract

We report a measurement of CP-violating asymmetries in B0-->(rhopi)0-->pi+pi-pi0 decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 375 million Y(4S) --> BBbar decays, collected by the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure 26 coefficients of the bilinear form-factor terms occurring in the time-dependent decay rate of the B0 meson. We derive the physically relevant quantities from these coefficients. In particular, we measure a constraint on the angle alpha of the Unitarity Triangle.

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