Measurements of partial branching fractions of inclusive B -> XTI4PFTI4PF(u)(lx+)nu(l) decays with hadronic tagging

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurements of partial branching fractions of inclusive B -> XTI4PFTI4PF(u)(lx+)nu(l) decays with hadronic tagging

Popis výsledku v původním jazyce

We present measurements of partial branching fractions of inclusive semileptonic B -&gt; 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 -&gt; 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 -&gt; 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 -&gt; X(u)l(l)(+nu) phase space. The most inclusive measurement corresponds to the phase space with lepton energies of E-l(B) &gt; 1 GeV, and we obtain Delta B(B -&gt; 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.

Název v anglickém jazyce

Measurements of partial branching fractions of inclusive B -> XTI4PFTI4PF(u)(lx+)nu(l) decays with hadronic tagging

Popis výsledku anglicky

We present measurements of partial branching fractions of inclusive semileptonic B -&gt; 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 -&gt; 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 -&gt; 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 -&gt; X(u)l(l)(+nu) phase space. The most inclusive measurement corresponds to the phase space with lepton energies of E-l(B) &gt; 1 GeV, and we obtain Delta B(B -&gt; 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

<a href="/cs/project/LTT17020" target="_blank" >LTT17020: Studium fyziky za standardním modelem v mezinárodním experimentu Belle II v Japonsku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

—

Svazek periodika

104

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

32

Strana od-do

012008

Kód UT WoS článku

000672781100003

EID výsledku v databázi Scopus

2-s2.0-85111076382