CERN Accelerating science

ATLAS experiment

The Higgs Boson as a Probe for New Physics

by Toyoko Orimoto (Northeastern University)

The discovery of the Higgs boson has ushered in a new era of exploration at the Large Hadron Collider (LHC). Persistent tensions in the standard model (SM) of particle physics compel us to seek out physics beyond the SM (BSM) at the TeV scale, and the Higgs boson provides us with a potential portal to new physics. A number of BSM models have been proposed as a solution to these existing tensions. For example, new, massive particles may couple to the SM Higgs boson, producing exotic decays of the SM Higgs boson or enhancements to the production of the SM Higgs boson.

ATLAS trigger system meets the challenges of Run 2

by Stefania Xella (University of Copenhagen), Jiri Masik (University of Manchester) for the ATLAS collaboration

The ATLAS trigger system allowed the efficient and stable collection of a rich data sample from the previous runs of the LHC.

The ForwArd Search ExpeRiment (FASER) will search for particles that might be produced parallel to the LHC’s beam line and may travel hundreds of metres without interacting before transforming into known and detectable particles, such as electrons and positrons.

A New Small Wheel for ATLAS is taking shape

by Aimilios Koulouris (ATLAS, NTUA), Panos Charitos (CERN)

To fully exploit the HL-LHC luminosities, the innermost stations, the so called Small Wheels (SW), of the ATLAS Muon Spectrometer need to be replaced by New Small Wheels (NSW); an upgrade scheduled for LS2. 

The LS2 period for the ATLAS detector

by Ludovico Pontecorvo (ATLAS experiment, CERN)

During the two year accelerator shutdown (LS2) the ATLAS detector will undergo a period of upgrades and maintenance.

HL-LHC computational challenge for ATLAS and CMS experiments

by Tommaso Boccali (INFN and CERN) Davide Costanzo (Sheffield U and CERN)

Discussing the computing models and future resource needs for ATLAS and CMS experiments and the possibilities opened up by quantum computing.

Colliders join the hunt for dark energy

by Spyros Argyropoulos (University of Iowa) & Panos Charitos (CERN)

A  recently proposed extension of the Standard Model that also accounts for Dark Energy, paves the way towards collider searches.

Higgs boson observed decaying to bottom quarks

by Panagiotis Charitos

Last month, the ATLAS and CMS collaborations jointly announced the discovery of the Higgs boson decaying into a matter-antimatter pair of bottom quarks.

Axion-like particle searches at the LHC

by Andrea Thamm, Tom Melia, Panos Charitos

An overview of LHC searches for Axion-like particles (ALPs) both at proton-proton and heavy-ion collisions. 

ATLAS presented first results from a more generic strategy that allows searches for physics beyond the Standard Model that effectively minimizes the probability of missing any signs of new physics.