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 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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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