Measurement of branching fractions of B decays to K{sub 1}(1270){pi} and K{sub 1}(1400){pi} and determination of the CKM angle {alpha} from B{sup 0{yields}}a{sub 1}(1260){sup {+-}{pi}{+-}}

Journal Article · Mon Mar 01 04:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.052009· OSTI ID:21409820

Aubert, B; Karyotakis, Y; Lees, J P; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V ^[1]; Garra Tico, J; Grauges, E ^[2]; Martinelli, M; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Battaglia, M; Brown, D N; Hooberman, B; Kerth, L T; Kolomensky, Yu G ^[5]

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1. Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Universite de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, 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 report measurements of the branching fractions of neutral and charged B meson decays to final states containing a K{sub 1}(1270) or K{sub 1}(1400) meson and a charged pion. The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, correspond to 454x10{sup 6} BB pairs produced in e{sup +}e{sup -} annihilation. We measure the branching fractions B(B{sup 0{yields}}K{sub 1}(1270){sup +{pi}-}+K{sub 1}(1400){sup +{pi}-})=3.1{sub -0.7}{sup +0.8}x10{sup -5} and B(B{sup +{yields}}K{sub 1}(1270){sup 0{pi}+}+K{sub 1}(1400){sup 0{pi}+})=2.9{sub -1.7}{sup +2.9}x10{sup -5} (<8.2x10{sup -5} at 90% confidence level), where the errors are statistical and systematic combined. The B{sup 0} decay mode is observed with a significance of 7.5{sigma}, while a significance of 3.2{sigma} is obtained for the B{sup +} decay mode. Based on these results, we estimate the weak phase {alpha}=(79{+-}7{+-}11) deg. from the time-dependent CP asymmetries in B{sup 0{yields}}a{sub 1}(1260){sup {+-}{pi}{+-}}decays.

• OSTI ID: 21409820
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ASYMMETRY
AXIAL VECTOR MESONS
B MESONS
B NEUTRAL MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BORON IONS
BOSONS
BRANCHING RATIO
CHARGED PARTICLES
CYCLIC ACCELERATORS
DIMENSIONLESS NUMBERS
ELECTRONS
ELEMENTARY PARTICLES
FERMILAB ACCELERATOR
FERMIONS
HADRONS
INTERACTIONS
IONS
K1-1270 MESONS
K1-1400 MESONS
LEPTONS
MATTER
MESONS
NATIONAL ORGANIZATIONS
PAIR PRODUCTION
PARTICLE PRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
POSITRONS
PSEUDOSCALAR MESONS
STANFORD LINEAR ACCELERATOR CENTER
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
TIME DEPENDENCE
US DOE
US ERDA
US ORGANIZATIONS