Updated Measurement of the CKM Angle Alpha Using B0-]rho+rho- Decays
Author | : B. Aubert |
Publisher | : |
Total Pages | : 21 |
Release | : 2006 |
ISBN-10 | : OCLC:316304794 |
ISBN-13 | : |
Rating | : 4/5 ( Downloads) |
Download or read book Updated Measurement of the CKM Angle Alpha Using B0-]rho+rho- Decays written by B. Aubert and published by . This book was released on 2006 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results from an analysis of B{sup 0} {yields} {rho}{sup +}{rho}{sup -} using 316 fb{sup -1} of {Upsilon}(4S) {yields} B{bar B} decays observed with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They measure the B{sup 0} {yields} {rho}{sup +}{rho}{sup -} branching fraction, longitudinal polarization fraction f{sub L}, and the CP-violating parameters S{sub long} and C{sub long}: {Beta}(B{sup 0} {yields} {rho}{sup +}{rho}{sup -}) = (23.5 {+-} 2.2(stat) {+-} 4.1(syst)) x 10{sup -6}, f{sub L} = 0.977 {+-} 0.024(stat){sub -0.013}{sup +0.015}(syst), S{sub long} = -0.19 {+-} 0.21(stat){sub -0.07}{sup +0.05}(syst), C{sub long} = -0.07 {+-} 0.15(stat) {+-} 0.06(syst). Using an isospin analysis of B {yields} {rho}{rho} decays they determine the angle {alpha} of the unitarity triangle. One of the two solutions, {alpha} [74,117]{sup o} at 68% CL, is compatible with the standard model. All results presented here are preliminary.