Measurements of CP-Violating Asymmetries in B{sup 0}{yields}a{sub 1}{sup {+-}}(1260){pi}{sup {+-}} Decays

Journal Article · Fri May 04 04:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.181803· OSTI ID:20951330

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Grauges, E ^[2]; Palano, A ^[3]; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S ^[4]; Eigen, G; Ofte, I; Stugu, B ^[5]; Abrams, G S ^[6]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Facultat de Fisica, Departament ECM, Universitat de Barcelona, E-08028 Barcelona (Spain)
3. Dipartimento di Fisica and INFN, Universita di Bari, I-70126 Bari (Italy)
4. Institute of High Energy Physics, Beijing 100039 (China)
5. Institute of Physics, University of Bergen, N-5007 Bergen (Norway)
6. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We present measurements of CP-violating asymmetries in the decay B{sup 0}{yields}a{sub 1}{sup {+-}}(1260){pi}{sup {+-}} with a{sub 1}{sup {+-}}(1260){yields}{pi}{sup {+-}}{pi}{sup {+-}}{pi}{sup {+-}}. The data sample corresponds to 384x10{sup 6} BB pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We measure the CP-violating asymmetry A{sub CP}{sup a{sub 1}}{sup {pi}}=-0.07{+-}0.07{+-}0.02, the mixing-induced CP violation parameter S{sub a{sub 1}}{sub {pi}}=0.37{+-}0.21{+-}0.07, the direct CP violation parameter C{sub a{sub 1}}{sub {pi}}=-0.10{+-}0.15{+-}0.09, and the parameters {delta}C{sub a{sub 1}}{sub {pi}}=0.26{+-}0.15{+-}0.07 and {delta}S{sub a{sub 1}}{sub {pi}}=-0.14{+-}0.21{+-}0.06. From these measured quantities we determine the angle {alpha}{sub eff}=78.6 deg. {+-}7.3 deg.

• OSTI ID: 20951330
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A1-1260 MESONS
ASYMMETRY
B NEUTRAL MESONS
CP INVARIANCE
PARTICLE DECAY
PARTICLE PRODUCTION
STANFORD LINEAR ACCELERATOR CENTER