Angular distributions in the decay B{yields}K*l{sup +}l{sup -}

Journal Article · Sun Feb 01 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.031102· OSTI ID:21259864

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Tico, J Garra; 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; Button-Shafer, J ^[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 use a sample of 384x10{sup 6} BB events collected with the BABAR detector at the PEP-II e{sup +}e{sup -} collider to study angular distributions in the rare decays B{yields}K*l{sup +}l{sup -}, where l{sup +}l{sup -} is either e{sup +}e{sup -} or {mu}{sup +}{mu}{sup -}. For low dilepton invariant masses, m{sub ll}<2.5 GeV/c{sup 2}, we measure a lepton forward-backward asymmetry A{sub FB}=0.24{sub -0.23}{sup +0.18}{+-}0.05 and K* longitudinal polarization F{sub L}=0.35{+-}0.16{+-}0.04. For m{sub ll}>3.2 GeV/c{sup 2}, we measure A{sub FB}=0.76{sub -0.32}{sup +0.52}{+-}0.07 and F{sub L}=0.71{sub -0.22}{sup +0.20}{+-}0.04.

• OSTI ID: 21259864
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 3; Other Information: DOI: 10.1103/PhysRevD.79.031102; (c) 2009 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
ANGULAR DISTRIBUTION
ASYMMETRY
B MESONS
ELECTRON-POSITRON COLLISIONS
GEV RANGE
KAONS
MASS
MUONS MINUS
MUONS PLUS
PAIR PRODUCTION
PARTICLE DECAY
POLARIZATION