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Short- vs. long-distance physics in : a data-driven analysis.
Eur Phys J C Part Fields
May 2024
Physik-Institut, Universität Zürich, 8057 Zurich, Switzerland.
We analyze data on and decays in the whole dilepton invariant mass spectrum with the aim of disentangling short- vs. long-distance contributions. The sizable long-distance amplitudes from narrow resonances are taken into account by employing a dispersive approach.
View Article and Find Full Text PDFConstraints on anomalous Higgs boson couplings from its production and decay using the WW channel in proton-proton collisions at .
Eur Phys J C Part Fields
August 2024
A study of the anomalous couplings of the Higgs boson to vector bosons, including -violation effects, has been conducted using its production and decay in the WW channel. This analysis is performed on proton-proton collision data collected with the CMS detector at the CERN LHC during 2016-2018 at a center-of-mass energy of 13 TeV, and corresponds to an integrated luminosity of 138 . The different-flavor dilepton final state is analyzed, with dedicated categories targeting gluon fusion, electroweak vector boson fusion, and associated production with a W or Z boson.
View Article and Find Full Text PDFSearch for Heavy Neutral Leptons in Decays of W Bosons Using a Dilepton Displaced Vertex in sqrt[s]=13 TeV pp Collisions with the ATLAS Detector.
Phys Rev Lett
August 2023
CERN, Geneva, Switzerland.
A search for a long-lived, heavy neutral lepton (N) in 139 fb^{-1} of sqrt[s]=13 TeV pp collision data collected by the ATLAS detector at the Large Hadron Collider is reported. The N is produced via W→Nμ or W→Ne and decays into two charged leptons and a neutrino, forming a displaced vertex. The N mass is used to discriminate between signal and background.
View Article and Find Full Text PDFTest of Lepton Universality in b→sℓ^{+}ℓ^{-} Decays.
Phys Rev Lett
August 2023
Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
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}. The analysis uses beauty mesons produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb^{-1}. Each of the four lepton universality measurements reported is either the first in the given q^{2} interval or supersedes previous LHCb measurements.
View Article and Find Full Text PDFLeptons lurking in semi-visible jets at the LHC.
Eur Phys J C Part Fields
September 2022
Institute for Particle Physics and Astrophysics, ETH Zürich, 8093 Zurich, Switzerland.
This Letter proposes a new search for confining dark sectors at the Large Hadron Collider. As a result of the strong dynamics in the hidden sector, dark matter could manifest in proton-proton collisions at the Large Hadron Collider in form of hadronic jets containing stable invisible bound states. These semi-visible jets have been studied theoretically and experimentally in the fully hadronic signature where the unstable composite dark matter can only decay promptly back to Standard Model quarks.
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