International Linear Collider
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First batch of jacks for HL-LHC delivered at CERN
No full textThe first batch of jacks required to support and align the HL-LHC magnets, TAXN absorbers, and crab cavity cryomodules has been received. This initial batch serves as a prerequisite before approving the series production of 134 units
The International Axion Observatory (IAXO): case, status and plans. Input to the European Strategy for Particle Physics
No full textThe International Axion Observatory (IAXO) is a next-generation axion helioscope designed to search for solar axions with unprecedented sensitivity. IAXO holds a unique position in the global landscape of axion searches, as it will probe a region of the axion parameter space inaccessible to any other experiment. In particular, it will explore QCD axion models in the mass range from meV to eV, covering scenarios motivated by astrophysical observations and potentially extending to axion dark matter models. Several studies in recent years have demonstrated that IAXO has the potential to probe a wide range of new physics beyond solar axions, including dark photons, chameleons, gravitational waves, and axions from nearby supernovae. IAXO will build upon the two-decade experience gained with CAST, the detailed studies for BabyIAXO, which is currently under construction, as well as new technologies. If, in contrast to expectations, solar axion searches with IAXO ``only'' result in limits on new physics in presently uncharted parameter territory, these exclusions would be very robust and provide significant constraints on models, as they would not depend on untestable cosmological assumptions
CLIC Higgs coupling prospects with 100 Hz operation
No full textThe staging scenario for CLIC has been updated following new studies of the beam emittance through the accelerator chain, which has resulted in higher expected luminosities, and a change in baseline to a 100 Hz repetition rate at the initial energy stage. Here, the Higgs coupling sensitivities are updated for the new staging plan
Search for new particles decaying into top quark-antiquark pairs in events with one lepton and jets in proton-proton collisions at 13 TeV
No full textA search for new particles decaying to top quark-antiquark pairs is performed using proton-proton collisions at a centre-of-mass energy of . The data recorded with the CMS detector between 2016 and 2018 are used, corresponding to an integrated luminosity of . Events containing exactly one muon or one electron, at least two jets, and missing transverse momentum in the final state are considered. Different models of new physics are probed. No significant deviation from the prediction is observed and upper limits are set on the production cross section for heavy resonances. A Z' boson with , , and relative width is excluded for masses in the range 0.44.3, 0.45.3, and 0.4, respectively. A Kaluza-Klein gluon in the Randall-Sundrum model and a dark matter mediator are excluded for masses between 0.5 and 1.0, respectively. Moreover, upper limits are set on the coupling strength modifier for scalar and pseudoscalar Higgs bosons in the two-Higgs-doublet models for , , and relative widths in the mass range 0.5
Charged particle and underlying event measurements with the ATLAS detector
No full textIn this talk, recent measurements of distributions sensitive to the underlying event, the hadronic activity observed in relationship with the hard scattering in the event, by the ATLAS experiment are presented. Underlying event observables like the average particle multiplicity and the transverse momentum sum are measured for Kaons as Lambda baryons as a function of the leading track-jet and are compared to MC predictions which in general fail to describe the data. In addition, a recent measurement of charged-particle multiplicities in diffractive pp collisions are presented. Events are classified using the ATLAS forward proton tagging
Combined effective field theory interpretation of Higgs boson, electroweak vector boson, top quark, and multijet measurements
No full textConstraints on Wilson coefficients (WCs) corresponding to dimension-6 operators of the standard model effective field theory (SMEFT) are determined from a simultaneous fit to seven sets of CMS measurements probing Higgs boson, electroweak vector boson, top quark, and multijet production. Measurements of electroweak precision observables at LEP and SLC are also included and provide complementary constraints to those from the CMS experiment. The CMS measurements, using LHC proton-proton collision data at 13 TeV, corresponding to integrated luminosities of 36.3 or 138 fb, are chosen to provide sensitivity to a broad set of operators, for which consistent SMEFT predictions can be derived. These are primarily measurements of differential cross sections which are parameterized as functions of the WCs. Measurements targeting production directly incorporate the SMEFT effects through event weights that are applied to the simulated signal samples, which enables detector-level predictions. Individual constraints on 64 WCs, and constraints on 42 linear combinations of WCs, are obtained.Constraints on the Wilson coefficients (WCs) corresponding to dimension-six operators of the standard model effective field theory (SMEFT) are determined from a simultaneous fit to seven sets of CMS measurements probing Higgs boson, electroweak vector boson, top quark, and multi-jet production. The measurements of the electroweak precision observables at LEP and SLC are also included and provide complementary constraints to those from CMS. The CMS measurements, using 36-138 fb of LHC proton-proton collision data at = 13 TeV, are chosen to provide sensitivity to a broad set of operators, for which consistent SMEFT predictions can be derived. These are primarily measurements of differential cross sections or, in the case of Higgs boson production, simplified template cross sections, which are subsequently parametrized in the WCs. Measurements targeting production model the SMEFT effects directly in the reconstructed observables. Individual constraints on 64 WCs, and constraints on 42 linear combinations of WCs, are obtained. In the case of the linear combinations, the 42 parameters are varied simultaneously
Fresh results (and surprises) from the James Webb Space Telescope
No full textIn less than three years since the release of the first data, the James Webb Space Telescope has revolutionised our knowledge and understanding of the Universe.
My talk will be a non-specialist review of the concept and current status of the mission, that is designed around an innovative technology combining unprecedented collecting area and IR sensitivity, and of some of the latest results, covering a wide range of topics from the exploration of our solar system, the atmosphere of exoplanets and the search for extraterrestrial life, the evolution of galaxies and black holes in the young Universe.
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