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Constraints 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 PDFDilepton Polarization as a Signature of Plasma Anisotropy.
Phys Rev Lett
June 2024
Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany.
We propose the angular distribution of lepton pairs produced in ultrarelativistic heavy-ion collisions as a probe of thermalization of the quark-gluon plasma. We focus on dileptons with invariant masses large enough that they are produced through quark-antiquark annihilation in the early stages of the collision. The angular distribution of the lepton in the rest frame of the pair then reflects the angular distribution of quark momenta.
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 PDFMeasurement of the mass dependence of the transverse momentum of lepton pairs in Drell-Yan production in proton-proton collisions at .
Eur Phys J C Part Fields
July 2023
Authors affiliated with an institute or an international laboratory covered by a cooperation agreement with CERN, Geneva, Switzerland.
The double differential cross sections of the Drell-Yan lepton pair (, dielectron or dimuon) production are measured as functions of the invariant mass , transverse momentum , and . The observable, derived from angular measurements of the leptons and highly correlated with , is used to probe the low- region in a complementary way. Dilepton masses up to 1 are investigated.
View Article and Find Full Text PDFNuclear Modification of Transverse Momentum Dependent Parton Distribution Functions by a Global QCD Analysis.
Phys Rev Lett
December 2022
Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
We perform the first simultaneous global QCD extraction of the transverse momentum dependent (TMD) parton distribution functions and the TMD fragmentation functions in nuclei. We have considered the world set of data from semi-inclusive electron-nucleus deep inelastic scattering and Drell-Yan dilepton production. In total, this data set consists of 90 data points from HERMES, Fermilab, RHIC, and LHC.
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