Measurements of partial branching fractions of inclusive B -> XTI4PFTI4PF(u)(lx+)nu(l) decays with hadronic tagging
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439937" target="_blank" >RIV/00216208:11320/21:10439937 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=J79rHHcvcR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=J79rHHcvcR</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.104.012008" target="_blank" >10.1103/PhysRevD.104.012008</a>
Alternative languages
Result language
angličtina
Original language name
Measurements of partial branching fractions of inclusive B -> XTI4PFTI4PF(u)(lx+)nu(l) decays with hadronic tagging
Original language description
We present measurements of partial branching fractions of inclusive semileptonic B -> X(u)l+nu(l) decays using the full Belle dataset of 711 fb(-1) of integrated luminosity at the gamma(4S) resonance and for l = e, mu. Inclusive semileptonic B -> X(u)l(l)(+nu) decays are Cabibbo-Kobayashi-Maskawa (CKM) suppressed and measurements are complicated by the large background from CKM favored B. Xclthorn.l transitions, which have a similar signature. Using machine learning techniques, we reduce this and other backgrounds effectively, while retaining access to a large fraction of the B -> X(c)l+nu(l) phase space and high signal efficiency. We measure partial branching fractions in three phase-space regions covering about 31% to 86% of the accessible B -> X(u)l(l)(+nu) phase space. The most inclusive measurement corresponds to the phase space with lepton energies of E-l(B) > 1 GeV, and we obtain Delta B(B -> X(u)l+nu(l)) = (1.59 +/- 0.07 +/- 0.16) x 10(-3) from a two-dimensional fit of the hadronic mass spectrum and the four-momentum-transfer squared distribution, with the uncertainties denoting the statistical and systematic error. We find vertical bar V-ub vertical bar = (4.10 +/- 0.09 +/- 0.22 +/- 0.15) x 10(-3) from an average of four calculations for the partial decay rate with the third uncertainty denoting the average theory error. This value is higher but compatible with the determination from exclusive semileptonic decays within 1.3 standard deviations. In addition, we report charmless inclusive partial branching fractions separately for B+ and B-0 mesons as well as for electron and muon final states. No isospin breaking or lepton flavor universality violating effects are observed.
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
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/LTT17020" target="_blank" >LTT17020: Study of Beyond Standard Model Physics with the International Experiment Belle II in Japan</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
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
ISSN
2470-0010
e-ISSN
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Volume of the periodical
104
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
32
Pages from-to
012008
UT code for WoS article
000672781100003
EID of the result in the Scopus database
2-s2.0-85111076382