Improved measurement of the electroweak penguin process B{yields}X{sub s}l{sup +}l{sup -}

Journal Article · Tue Nov 01 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.092005· OSTI ID:20713806

Iwasaki, M; Itoh, K; Aihara, H ^[1]; Abe, K; Adachi, I; Gershon, T; Haba, J; Hastings, N C; Hazumi, M; Ishikawa, A; Itoh, R; Katayama, N; Kichimi, H; Nakamura, I; Nakao, M; Nakazawa, H; Nishida, S; Ozaki, H; Sagawa, H; Sakai, Y ^[2]

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1. Department of Physics, University of Tokyo, Tokyo (Japan)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); and others

We present an improved measurement of the branching fraction for the electroweak penguin process B{yields}X{sub s}l{sup +}l{sup -}, where l is an electron or a muon and X{sub s} is a hadronic system containing an s-quark. The measurement is based on a sample of 152x10{sup 6} {upsilon}(4S){yields}BB events collected with the Belle detector at the KEKB energy asymmetric e{sup +}e{sup -} collider. The X{sub s} hadronic system is reconstructed from one K{sup {+-}} or K{sub S}{sup 0} and up to four pions, where at most one pion can be neutral. Averaging over both lepton flavors, the inclusive branching fraction is measured to be B(B{yields}X{sub s}l{sup +}l{sup -})=(4.11{+-}0.83(stat){sub -0.81}{sup +0.85}(syst))x10{sup -6} for M{sub l{sup +}}{sub l{sup -}}>0.2 GeV/c{sup 2}.

• OSTI ID: 20713806
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 72; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MESONS
BRANCHING RATIO
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
FLAVOR MODEL
GEV RANGE
KAONS MINUS
KAONS NEUTRAL SHORT-LIVED
KAONS PLUS
MULTIPARTICLE SPECTROMETERS
MUONS
PARTICLE IDENTIFICATION
PIONS
POSITRONS
S QUARKS
SEMILEPTONIC DECAY
UPSILON-10580 MESONS