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Determination of the Relative Sign of the Higgs Boson Couplings to W and Z Bosons Using WH Production via Vector-Boson Fusion with the ATLAS Detector.
Phys Rev Lett
October 2024
CERN, Geneva, Switzerland.
Article Synopsis
- The study investigates the associated production of Higgs and W bosons, focusing on how the relative signs of the Higgs couplings to W and Z bosons impact the process.
- Two specific searches were conducted using large amounts of collision data from the LHC to analyze different coupling scenarios: one for opposite-sign couplings and another for same-sign (standard model-like) couplings.
- The results significantly exclude the opposite-sign coupling hypothesis and set a strict upper limit on the production rate of this process compared to standard model predictions.
Article Synopsis
- Researchers used varied experimental searches with and without missing transverse momentum to analyze a Two-Higgs-Doublet Model (2HDM) augmented by a pseudo-scalar that mediates interactions between ordinary and dark matter.
- The analysis utilized data from proton-proton collisions at 13 TeV collected by the ATLAS detector at the Large Hadron Collider between 2015 and 2018, totaling up to 139 fb.
- Three key searches were statistically combined, focusing on large missing transverse momentum along with decaying Z bosons, Higgs bosons decaying to bottom quarks, and charged Higgs bosons interacting with top and bottom quarks, to derive constraints for various benchmark scenarios in the 2HDM+a
Precise QCD predictions for W-boson production in association with a charm jet.
Eur Phys J C Part Fields
April 2024
Department of Physics, University of Zürich, 8057 Zurich, Switzerland.
The production of a -boson with a charm quark jet provides a highly sensitive probe of the strange quark distribution in the proton. Employing a novel flavour dressing procedure to define charm quark jets, we compute +charm-jet production up to next-to-next-to-leading order (NNLO) in QCD. We study the perturbative stability of production cross sections with same-sign and opposite-sign charge combinations for the boson and the charm jet.
View Article and Find Full Text PDFCombination of Measurements of the Top Quark Mass from Data Collected by the ATLAS and CMS Experiments at sqrt[s]=7 and 8 TeV.
Phys Rev Lett
June 2024
CERN, Geneva, Switzerland.
Article Synopsis
- * The measurements utilized both semileptonic and hadronic decays of top quarks, along with events focused on single top quark production in the electroweak t channel.
- * The combined result for the top quark mass is 172.52 GeV, with a reduced total uncertainty of 0.33 GeV, showcasing an improvement of 31% over previous measurements.
Astrophysical Equation-of-State Constraints on the Color-Superconducting Gap.
Phys Rev Lett
June 2024
Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
We demonstrate that astrophysical constraints on the dense-matter equation of state place an upper bound on the color-superconducting gap in dense matter above the transition from nuclear matter to quark matter. Pairing effects in the color-flavor locked quark matter phase increase the pressure at high density, and if this effect is sufficiently large then the requirements of causality and mechanical stability make it impossible to reach such a pressure in a way that is consistent with what is known at lower densities. The intermediate-density equation of state is inferred by considering extensions of chiral effective field theory to neutron star densities, and conditioning these using current astrophysical observations of neutron star radius, maximum mass, and tidal deformability (PSR J0348+0432, PSR J1624-2230, PSR J0740+6620, GW170817).
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