Limit on the B-0 ->rho(0)rho(0) branching fraction and implications for the Cabibbo-Kobayashi-Maskawa angle alpha

作者：Aubert B^*; Barate R; Boutigny D; Couderc F; Karyotakis Y; Lees JP; Poireau V; Tisserand V; Zghiche A; Grauges Pous E; 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; Day CT; Gill MS; Gritsan **; Groysman Y; Jacobsen RG; Kadel RW; Kadyk J; Kerth LT; Kolomensky YG; Kukartsev G; Lynch G; Mir LM; Oddone PJ; Orimoto TJ; Pripstein M; Roe NA

来源：Physical Review Letters, 2005, 94(13): 131801.

DOI：10.1103/PhysRevLett.94.131801

We search for the decay B-0->rho(0)rho(0) in a data sample of about 227x10(6) Upsilon(4S)-> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We find no significant signal and set an upper limit of 1.1x10(-6) at 90% C.L. on the branching fraction. As a result, the uncertainty due to penguin contributions on the Cabibbo-Kobayashi-Maskawa unitarity angle alpha measured in B ->rho rho decays is decreased to 11 degrees at 68% C.L.

• 出版日期2005-4-8
• 单位中国地震局