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Measurement of the lepton forward-backward asymmetry in B -˃ X(s)l(+)l(-) decays with a sum of exclusive modes

Title
Measurement of the lepton forward-backward asymmetry in B -˃ X(s)l(+)l(-) decays with a sum of exclusive modes
Author
천병구
Issue Date
2016-02
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v. 93, NO 3, Article number 032008, Page. 32008-32008
Abstract
We report the first measurement of the lepton forward-backward asymmetry A(FB) as a function of the squared four-momentum of the dilepton system, q(2), for the electroweak penguin process B -˃ X(s)l(+)l(-) with a sum of exclusive final states, where l is an electron or a muon and X-s is a hadronic recoil system with an s quark. The results are based on a data sample containing 772 x 10(6) B (B) over bar pairs recorded at the gamma (4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. A(FB) for the inclusive B -˃ X(s)l(+)l(-) is extrapolated from the sum of 10 exclusive X-s states whose invariant mass is less than 2 GeV/c(2). For q(2) ˃ 10.2 GeV2/c(2), A(FB) ˂ 0 is excluded at the 2.3 sigma level, where sigma is the standard deviation. For q(2) ˂ 4.3 GeV2/c(2), the result is within 1.8 sigma of the standard model theoretical expectation.
URI
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.032008http://hdl.handle.net/20.500.11754/31880
ISSN
2470-0010; 2470-0029
DOI
10.1103/PhysRevD.93.032008
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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