Observation of B{sup +}{yields}a{sub 1}{sup +}(1260)K{sup 0} and B{sup 0}{yields}a{sub 1}{sup -}(1260)K{sup +}

Journal Article · Fri Feb 08 04:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.051803· OSTI ID:21024708

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Garra Tico, J; Grauges, E ^[2]; Lopez, L; Palano, A; Pappagallo, M ^[3]; Eigen, G; 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 branching fraction measurements of the decays B{sup +}{yields}a{sub 1}{sup +}(1260)K{sup 0} and B{sup 0}{yields}a{sub 1}{sup -}(1260)K{sup +} with a{sub 1}{sup {+-}}(1260){yields}{pi}{sup {+-}}{pi}{sup {+-}}{pi}{sup {+-}}. The data sample corresponds to 383x10{sup 6} BB pairs produced in e{sup +}e{sup -} annihilation through the {upsilon}(4S) resonance. We measure the products of the branching fractions B(B{sup +}{yields}a{sub 1}{sup +}(1260)K{sup 0})B(a{sub 1}{sup +}(1260){yields}{pi}{sup -}{pi}{sup +}{pi}{sup +})=(17.4{+-}2.5{+-}2 = .2)x10{sup -6} and B(B{sup 0}{yields}a{sub 1}{sup -}(1260)K{sup +})B(a{sub 1}{sup -}(1260){yields}{pi}{sup +}{pi}{sup -}{pi}{sup -})=(8.2{+-}1.5{+-}1. = 2)x10{sup -6}. We also measure the charge asymmetries A{sub ch}(B{sup +}{yields}a{sub 1}{sup +}(1260)K{sup 0})=0.12{+-}0.11{+-}0.02 and A{sub ch}(B{sup 0}{yields}a{sub 1}{sup -}(1260)K{sup +})=-0.16{+-}0.12{+-}0.01. The first uncertainty quoted is statistical and the second is systematic.

• OSTI ID: 21024708
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A1-1260 MESONS
ANNIHILATION
ASYMMETRY
B NEUTRAL MESONS
B PLUS MESONS
BRANCHING RATIO
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
KAONS NEUTRAL
KAONS PLUS
PAIR PRODUCTION
PARTICLE DECAY
PIONS MINUS
PIONS PLUS
POSITRONS