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Search for light long-lived particles decaying to displaced jets in proton-proton collisions at √s = 13.6 TeV.
Rep Prog Phys
January 2025
European Organization for Nuclear Research, HCP, CH-1211 GENEVE 23, Geneva, 1211 Geneva 23, SWITZERLAND.
A search for light long-lived particles decaying to displaced jets is presented, using a data sample of proton-proton collisions at a center-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 34.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC in 2022.
View Article and Find Full Text PDFModification of Quark-Gluon Distributions in Nuclei by Correlated Nucleon Pairs.
Phys Rev Lett
October 2024
Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France.
We extend the QCD Parton Model analysis using a factorized nuclear structure model incorporating individual nucleons and pairs of correlated nucleons. Our analysis of high-energy data from lepton deep-inelastic scattering, Drell-Yan, and W and Z boson production simultaneously extracts the universal effective distribution of quarks and gluons inside correlated nucleon pairs, and their nucleus-specific fractions. Such successful extraction of these universal distributions marks a significant advance in our understanding of nuclear structure properties connecting nucleon- and parton-level quantities.
View Article and Find Full Text PDFHunting for Bileptons at Hadron Colliders.
Entropy (Basel)
October 2024
INFN, Laboratori Nazionali di Frascati, Via E. Fermi 54, 00044 Frascati, Italy.
I review possible signals at hadron colliders of bileptons, namely doubly charged vectors or scalars with lepton number L=±2, as predicted by a 331 model, based on a SU(3)c×SU(3)L×U(1)X symmetry. In particular, I account for a version of the 331 model wherein the embedding of the hypercharge is obtained with the addition of three exotic quarks and vector bileptons. Furthermore, a sextet of SU(3)L, necessary to provide masses to leptons, yields an extra scalar sector, including a doubly charged Higgs, i.
View Article and Find Full Text PDFThe NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of 1.4×10^{17} protons on dump collected in 2021. No evidence for a dark photon signal is observed.
View Article and Find Full Text PDFA comparative study of flavour-sensitive observables in hadronic Higgs decays.
Eur Phys J C Part Fields
August 2024
Institute for Theoretical Physics, ETH, 8093 Zurich, Switzerland.
Jet production from hadronic Higgs decays at future lepton colliders will have significantly different phenomenological implications than jet production via off-shell photon and -boson decays, owing to the fact that Higgs bosons decay to both pairs of quarks and gluons. We compute observables involving flavoured jets in hadronic Higgs decays to three partons at Born level including next-to-leading order corrections in QCD (i.e.
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