Home > Articles > Published articles > Improved measurement of the Cabibbo-Kobayashi-Maskawa angle α using B0(B)→p+p- decays |
Date: | 2005 |
Abstract: | We present results from an analysis of B0(B¯¯¯0)→ρ+ρ− using 232×106 Υ(4S)→BB¯¯¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction fL=0. 978±0. 014(stat)+0. 021−0. 029(syst) and the CP-violating parameters SL=−0. 33±0. 24(stat)+0. 08−0. 14(syst) and CL=−0. 03±0. 18(stat)±0. 09(syst). Using an isospin analysis of B→ρρ decays, we determine the unitarity triangle parameter α. The solution compatible with the standard model is α=(100±13)°. |
Rights: | Tots els drets reservats. |
Language: | Anglès |
Document: | Article ; Versió publicada |
Subject: | Electron positron ; Colliding beams ; Annihilation ; Upsilon(10570) ; Electroproduction ; Hadronic decay ; Pair production ; Isospin ; CKM matrix |
Published in: | Physical review letters, Vol. 95, Issue 4 (July 2005) , p. 041805, ISSN 1079-7114 |
7 p, 149.2 KB |