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Visit by the Science, Innovation and Technology Committee, Commons Select Committee, Great Britain
No full textVisit by the Science, Innovation and Technology Committee, Commons Select Committee, United Kingdom of Great Britain and Northern Irelan
High efficiency veto hadron calorimeter in the NA64 experiment at CERN
No full textThe NA64 is a fixed-target experiment at the CERN SPS designed to search for Light particle Dark Matter (LDM) candidates with masses in the sub-GeV range. During the 2016-2022 runs, the experiment obtained the world-leading constraints, leaving however part of the well-motivated region of parameter space suggested by benchmark LDM models still unexplored. To further improve sensitivity, as part of the upgrades to the setup of NA64 at the CERN SPS H4 beamline, a prototype veto hadron calorimeter (VHCAL) was installed in the downstream region of the experiment during the 2023 run. The VHCAL, made of Cu-Sc layers, was expected to be an efficient veto against upstream electroproduction of large-angle hadrons or photon-nuclear interactions, reducing the background from secondary particles escaping the detector acceptance. With the collected statistics of 4.4×10^11 electrons on target (EOT), we demonstrate the effectiveness of this approach by rejecting this background by more than an order of magnitude. This result provides an essential input for designing a full-scale optimized VHCAL to continue running background-free during LHC Run 4, when we expect to collect 10^13 EOT. Furthermore, this technique combined with improvements in the analysis enables us to decrease our missing energy threshold from 50 GeV to 40 GeV thereby enhancing the signal sensitivity of NA64
ITk pixel system test of the ATLAS experiment
No full textThe ATLAS experiment is preparing for the High-Luminosity LHC (HL-LHC) upgrade, which will require the substitution of the current Inner Detector (ID) with a new all-silicon Inner Tracker (ITk). This work presents the results of the ITk Pixel system test, focusing on module performance, power consumption, data transmission and cooling efficiency, during detector integration. The results validate the system's readiness for the extreme conditions expected at the HL-LHC
Di-decay signature of new physics particles at intensity frontier experiments
No full textWe investigate a strategy to search for unstable feebly interacting particles (FIPs) at intensity frontier experiments by leveraging ``di-decay'' events, in which two FIPs are produced simultaneously, and each decays inside the detector. Compared to standard single-decay searches, di-decays yield cleaner signals, allow reconstructing the mother particle producing the FIPs, and offer deeper insight into the FIP couplings to Standard Model particles. As a concrete illustration, we focus on Higgs-like scalars that couple quadratically to the Higgs boson, deriving sensitivity projections at SHiP, Belle~II, and the Downstream algorithm at LHCb. In particular, at Belle II, non-negligible backgrounds for single-decay searches make di-decays highly competitive, providing a distinctive handle on the production and lifetime of these scalars. Our findings will potentially affect the search program of these experiments
LLWI2025 - Searches for Exotic Heavy Resonances with the ATLAS detector
No full textMany new physics models predict the existence of new, heavy particles. This talk summarises recent ATLAS searches for Beyond-the-Standard-Model heavy resonances which decay to pairs of quarks, or leptons, using Run 2 data collected at the LHC