Study of B{sup 0}{yields}{rho}{sup +}{rho}{sup -} decays and constraints on the CKM angle {alpha}

Journal Article · Sat Sep 01 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.052007· OSTI ID:21027675

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Tico, J Garra; Grauges, E ^[2]; Lopez, L; Palano, A ^[3]; Eigen, G; Ofte, I; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D N ^[5]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We present results from an analysis of B{sup 0}{yields}{rho}{sup +}{rho}{sup -} decays using (383.6{+-}4.2)x10{sup 6} BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The measurements of 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} are as follows: B(B{sup 0}{yields}{rho}{sup +}{rho}{sup -})=(25.5{+-}2.1(stat){sub -3.9}{sup +3.6}(syst))x10{sup -6}, f{sub L}=0.992{+-}0.024(stat){sub -0.013}{sup +0.026}(syst), S{sub long}=-0.17{+-}0.20(stat){sub -0.06}{sup +0.05}(syst), C{sub long}=0.01{+-}0.15(stat){+-}0.06(syst). We determine the unitarity triangle angle {alpha}, using an isospin analysis of B{yields}{rho}{rho} decays. One of the two solutions, {alpha}=[73.1,117.0] deg. at 68% confidence level, is compatible with standard model-based fits of existing data. Constraints on the unitarity triangle are also evaluated using an SU(3) symmetry-based approach.

• OSTI ID: 21027675
• Journal Information: Physical Review. D, Particles Fields, Vol. 76, Issue 5; Other Information: DOI: 10.1103/PhysRevD.76.052007; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
BRANCHING RATIO
CP INVARIANCE
ELECTRON-POSITRON INTERACTIONS
ISOSPIN
MATHEMATICAL SOLUTIONS
MESON FACTORIES
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
POLARIZATION
RHO-770 MESONS
STANDARD MODEL
SU-3 GROUPS
UNITARITY