CERN Courier Jan/Feb 2023

Front cover of the CERN Courier Jan/Feb 2023
Improved resistive-plate-chamber technology being installed in CMS in 2021.

Welcome to the digital edition of the January/February 2023 issue of CERN Courier.

The ATLAS and CMS detectors are being prepared for their biggest overhauls yet, in preparation for the tenfold increase in data to be delivered by the High-Luminosity LHC from 2029. The “Phase II” detector upgrades include state-of-the-art all-silicon inner trackers, high-granularity calorimeters and faster trigger and data-acquisition systems (p22 and 33). ALICE and LHCb are also preparing major upgrades for the 2030s. Meanwhile, the LHC keeps on breaking records, producing a peak proton–proton luminosity of 2.5 × 1034 cm–2 s–1 and providing lead–lead collisions at 5.36 TeV per nucleon pair (p11) before CERN’s year-end-technical stop on 28 November.

This issue looks back to the discovery of the W and Z bosons at the SPS 40 years ago (p41) and to the origins of the SESAME light source in the CERN theory corridors 30 years ago (p28). We also showcase new applications of accelerator technology in radiotherapy (p8) and future hydrogen-powered aircraft (p9), and report on the most precise tests of lepton-flavour universality from LHCb (p7). Also in the issue: Effective Field Theory (p37), sphere-stacking (p42), the latest conference reports (p15) and LHC-experiment results (p12), reviews (p44), careers (p46) and more.

j CERN Courier January/February 2023