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Citation/Abstract

Study of the rare decay B mesons decaying to X mesons positive and negative leptons at BABAR


2004 2004

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Abstract (summary)


Flavor-changing neutral current transitions are forbidden at tree level in the Standard Model and can only occur via higher order diagrams. Since the amplitudes for such loops are dominated by the heaviest known particles, and non-SM effects are expected to contribute at the same order as the SM, such processes are an ideal place to look for new physics.

We present a measurement of the inclusive branching fraction for the flavor-changing neutral current process B [arrow right] Xs [cursive l]+ [cursive l]- with a sample of 81.9 fb-1 , collected with the BABAR detector at the Stanford Linear Accelerator Center. The final state is reconstructed from e+e - or μ+ μ- pairs and a hadronic system consisting of one K± or K s and up to two pions, with at most one π0 . We observe a signal of 40 ± 10(stat) ± 2(syst) events and extract a branching fraction [Special characters omitted.] (B [arrow right] Xs [cursive l] + [cursive l]- ) = (5.6 ± 1.5(stat) ± 0.6(exp. syst) ± 1.1(model syst)) × 10-6 for mll > 0.2 GeV.

Indexing (details)


Subject
Particle physics
Classification
0798: Particle physics
Identifier / keyword
Pure sciences, B meson, X mesons, Rare B decays, Branching fractions, Flavor-changing neutral currents
Title
Study of the rare decay B mesons decaying to X mesons positive and negative leptons at BABAR
Author
Koptchev, Ventzislav B.
Pages
184 p.
Number of pages
184
Publication year
2004
Degree date
2004
School code
0118
Source
DAI-B 65/11, p. 5800, May 2005
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0496132520, 9780496132522
Advisor
Willocq, Stephane
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3152717
ProQuest document ID
305177661
Copyright
Copyright UMI - Dissertations Publishing 2004
Document URL
http://search.proquest.com/docview/305177661