Test of lepton flavor universality in B+- RIGHTWARDS ARROW K+- μ+μ- and B+- RIGHTWARDS ARROW K+- e+ e- decays in proton-proton collisions at SQUARE ROOTs=13 TeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10487215" target="_blank" >RIV/00216208:11320/24:10487215 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=FiZWIHmUaX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=FiZWIHmUaX</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6633/ad4e65" target="_blank" >10.1088/1361-6633/ad4e65</a>
Alternative languages
Result language
angličtina
Original language name
Test of lepton flavor universality in B+- RIGHTWARDS ARROW K+- μ+μ- and B+- RIGHTWARDS ARROW K+- e+ e- decays in proton-proton collisions at SQUARE ROOTs=13 TeV
Original language description
A test of lepton flavor universality in B-+/- -> K +/- mu(+) mu(-) and B-+/- -> (K)+/- e(+) e(-) decays, as well as a measurement of differential and integrated branching fractions of a nonresonant B-+/- -> K-+/- mu(+)mu(-) decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions at root s = 13 TeV recorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractions B(B-+/- -> K-+/- mu(+) mu(-)) to B(B-+/- -> K-+/- e(+) e(-)) is determined from the measured double ratio R(K) of these decays to the respective branching fractions of the B-+/- -> J/psi K-+/- with J/psi -> mu(+)mu(-) and e(+) e(-) decays, which allow for significant cancellation of systematic uncertainties. The ratio R(K) is measured in the range 1.1 < q(2) < 6.0 GeV2, where q is the invariant mass of the lepton pair, and is found to be R(K) = 0.78(-0.23)(+0.47), in agreement with the standard model expectation R(K) approximate to 1. This measurement is limited by the statistical precision of the electron channel. The integrated branching fraction in the same q(2) range, B(B-+/- -> K-+/- mu(+) mu(-)) = (12.42 +/- 0.68) x 10(-8), is consistent with the present world-average value and has a comparable precision.
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
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Reports on Progress in Physics
ISSN
0034-4885
e-ISSN
1361-6633
Volume of the periodical
87
Issue of the periodical within the volume
7
Country of publishing house
GB - UNITED KINGDOM
Number of pages
36
Pages from-to
077802
UT code for WoS article
001287343200001
EID of the result in the Scopus database
2-s2.0-85197704843