Results 11 to 20 of about 200,828 (293)

Test of lepton universality in beauty-quark decays [PDF]

open access: yesNature Physics, 2021
The standard model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction ...
L. C. R. Aaij   +499 more
semanticscholar   +1 more source

Test of Lepton Universality in b→sℓ^{+}ℓ^{-} Decays. [PDF]

open access: yesPhysical Review Letters, 2022
The first simultaneous test of muon-electron universality using B^{+}→K^{+}ℓ^{+}ℓ^{-} and B^{0}→K^{*0}ℓ^{+}ℓ^{-} decays is performed, in two ranges of the dilepton invariant-mass squared, q^{2}.
R. Aaij   +499 more
semanticscholar   +1 more source

Constraining new physics in entangled two-qubit systems: top-quark, tau-lepton and photon pairs [PDF]

open access: yesThe European Physical Journal C, 2022
The measurement of quantum entanglement can provide a new and most sensitive probe to physics beyond the Standard Model. We use the concurrence of the top-quark pair spin states produced at colliders to constrain the magnetic dipole term in the coupling ...
M. Fabbrichesi   +2 more
semanticscholar   +1 more source

Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021 [PDF]

open access: yes, 2022
This paper reports world averages of measurements of $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavour Averaging Group using results available before April 2021.
H. C. Y. Amhis   +40 more
semanticscholar   +1 more source

Tools for estimating fake/non-prompt lepton backgrounds with the ATLAS detector at the LHC [PDF]

open access: yesJournal of Instrumentation, 2022
Measurements and searches performed with the ATLAS detector at the CERN LHC often involve signatures with one or more prompt leptons. Such analyses are subject to `fake/non-prompt' lepton backgrounds, where either a hadron or a lepton from a hadron decay
G. Aad   +499 more
semanticscholar   +1 more source

Lepton asymmetric universe [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2022
The recent observation of 4He implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation.
M. Kawasaki, Kai Murai
semanticscholar   +1 more source

Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle [PDF]

open access: yesJournal of High Energy Physics, 2021
Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly ...
K. Uno   +182 more
semanticscholar   +1 more source

Test of lepton universality with B0 → K*0ℓ+ℓ− decays [PDF]

open access: yesJournal of High Energy Physics, 2017
A test of lepton universality, performed by measuring the ratio of the branching fractions of the B0 → K*0μ+μ− and B0 → K*0e+e− decays, RK*0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb}
R. Aaij   +499 more
semanticscholar   +2 more sources

Fermion mass hierarchies, large lepton mixing and residual modular symmetries [PDF]

open access: yesJournal of High Energy Physics, 2021
In modular-invariant models of flavour, hierarchical fermion mass matrices may arise solely due to the proximity of the modulus τ to a point of residual symmetry.
P. Novichkov, J. Penedo, S. Petcov
semanticscholar   +1 more source

Test of Lepton-Flavor Universality in B→K^{*}ℓ^{+}ℓ^{-} Decays at Belle.

open access: yesPhysical Review Letters, 2021
We present a measurement of R_{K^{*}}, the branching fraction ratio B(B→K^{*}μ^{+}μ^{-})/B(B→K^{*}e^{+}e^{-}), for both charged and neutral B mesons. The ratio for the charged case R_{K^{*+}} is the first measurement ever performed.
S. Wehle   +180 more
semanticscholar   +1 more source

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