Observation of the decay B 0 → ρ + ρ − and measurement of the branching fraction and polarization

L Piemontese,A Sarti,E Treadwell,R Baldiniferroli,A Calcaterra,R De Sangro,G Finocchiaro,P Patteri,M Piccolo, A Zallo,A Buzzo,R Capra,R Contri, G Crosetti,M Lo Vetere,M Macri,M R Monge, S Passaggio, C Patrignani,E Robutti,A Santroni,S Tosi,S Bailey,M Morii,E Won,R S Dubitzky, U Langenegger, W Bhimji,D A Bowerman, P D Dauncey,U Egede,G W Morton, J Nash,G P Taylor,G Grenier,Suk Joong Lee,U Mallik,J Cochran,H B Crawley,J W Lamsa, W T Meyer,S Prell,E I Rosenberg,J Yi, M Davier,G Grosdidier,A Hocker, S Laplace, F Le Diberder,V Lepeltier,A M Lutz,T C Petersen,S Plaszczynski,M H Schune,L Tantot,G Wormser, V Brigljevic,C H Cheng,D J Lange,M C Simani,D M Wright,A J Bevan,J P Coleman,J R Fry, E Gabathuler,R Gamet,Mark A Kay,R J Parry,D J Payne,R J Sloane, C Touramanis,J J Back, P F Harrison, G B Mohanty,C L Brown,G Cowan,R L Flack,H U Flaecher,Simon C George,M G Green,A Kurup,C E Marker,T R Mcmahon,S Ricciardi, F Salvatore,G Vaitsas,M Winter,C L Davis,J Allison,N R Barlow, R J Barlow,P A Hart, M 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Dong, J Dorfan,D Dujmic,W Dunwoodie,E Elsen,R C Field, T Glanzman,S J Gowdy,T Hadig,V Halyo,T Hryn Ova,W R Innes,M H Kelsey, P Kim, M L Kocian,D W G S Leith,J Libby,S Luitz, V Luth,H L Lynch,H Marsiske,R Messner,D R Muller,C P O Grady, V E Ozcan,A Perazzo,M Perl,S Petrak,B N Ratcliff, A Roodman,A A Salnikov, R H Schindler,J Schwiening,G Simi,A Snyder, A Soha,J Stelzer, D Su,M K Sullivan, J Va Vra, S R Wagner,M Weaver,A J R Weinstein,W J Wisniewski,C C Young,P R Burchat,A J Edwards,T I Meyer, B A Petersen,C Roat,M Ahmed,S M Ahmed,M S Alam,J Ernst,M A Saeed,M Saleem,F R Wappler,W Bugg,M Krishnamurthy,S M Spanier,R Eckmann,H Kim,J L Ritchie,A Satpathy,R F Schwitters, J M Izen,I Kitayama,X C Lou, S Ye,F Bianchi,M Bona,F Gallo,C Borean,L Bosisio, F Cossutti, G Della Ricca,S Dittongo, S Grancagnolo,L Lanceri,P Poropat,L Vitale,G Vuagnin,R S Panvini,Sw Banerjee,Daniel Fortin, P D Jackson, R Kowalewski,J M Roney,H R Band, S Dasu,M Datta,A M Eichenbaum,J R Johnson,P E Kutter,Huimin Li,Ruihua 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T J Orimoto,M Pripstein,N A Roe,M T Ronan,V G Shelkov,A V Telnov,W A Wenzel,K E Ford,T J Harrison, C M Hawkes,S E Morgan,A T Watson,N K Watson,M Fritsch,K Goetzen,T Held,H Koch,B Lewandowski,M Pelizaeus,K Peters,H Schmuecker, M Steinke, J T Boyd,N Chevalier,W N Cottingham,M P Kelly,T E Latham,C Mackay,F F Wilson,Kenji Abe,T Cuhadardonszelmann,C Hearty,T S Mattison

Physical Review D（2004）

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摘要

We have observed the rare decay B0 → ρ+ ρ- in a sample of 89 million BB pairs recorded with the BABAR detector. The number of observed events is 88-21 +23±9 with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be β(B0 → ρ+ ρ-) = (25-6-6 +7+5× 10-6 and ΓLΓ = 0.98-0.08 +0.02±0. 03, respectively. © 2004 The American Physical Society.

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