Evidence for B- -> D(s)(+)K(-)l(-)(nu)over-bar(l) and search for B- -> D-s*(+)K(-)l(-)(nu)over-bar(l)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10371056" target="_blank" >RIV/00216208:11320/12:10371056 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevD.86.072007" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.86.072007</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.86.072007" target="_blank" >10.1103/PhysRevD.86.072007</a>
Alternative languages
Result language
angličtina
Original language name
Evidence for B- -> D(s)(+)K(-)l(-)(nu)over-bar(l) and search for B- -> D-s*(+)K(-)l(-)(nu)over-bar(l)
Original language description
We report measurements of the decays B- -> D-s(()*()+)K(-)l(-)(nu) over bar (l) in a data sample containing 657 X 10(6)B (B) over bar pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe a signal with a significance of 6 sigma for the combined D-s and D-s* modes and find the first evidence of the B- -> D(s)(+)K(-)l(-)(nu) over bar (l) decay with a significance of 3.4 sigma. We measure the following branching fractions: B(B- -> D(s)(+)K(-)l(-)(nu) over bar (l)) (0.30 +/- 0.09(stat)(-0.08)(+0.11) (syst) X 10(-3) and B(B- -> D-s(()*()+)K(-)l(-)(nu) over bar (l)) 0.59 +/- 0.12(stat) +/- 0.15(syst)) X 10(-3) and set an upper limit B(B- -> D-s*(+)K(-)l(-)(nu) over bar (l)) = 0.5 X 10(-3) at the 90% confidence level. We also present the first measurement of the Ds+K- invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6 GeV/c(2).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/LA10033" target="_blank" >LA10033: Participation in the Belle a Belle II experiments: study of B-meson decays</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D: Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998
e-ISSN
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Volume of the periodical
86
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
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UT code for WoS article
000310193900001
EID of the result in the Scopus database
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