Observation and Reconstruction of Antiproton Annihilation at Rest in LArIAT

by Vincent Basque (Fermilab)

Tuesday 4 Feb 2025, 14:15 → 15:15 Europe/London

Antiproton annihilation at rest can provide a unique probe into the intra-nuclear structure of nuclei. This process was first observed in the 1950’s using photographic emulsion and has since been observed and studied on a variety of nuclei. We present here the first observation and reconstruction of antiproton annihilation at-rest interactions on argon nuclei using data from the LArIAT experiment, a liquid argon time projection chamber (LArTPC). LArIAT was exposed to a charged particle test-beam at Fermilab from 2015-2017. Antiprotons tagged using LArIAT’s beamline instrumentation were reconstructed in the LArTPC, and the multiplicities of final-state particles emerging from the identified annihilation at-rest vertex were measured. These results will inform searches for neutron-antineutron oscillation events in the future LArTPCs like DUNE due to their similar topological signature.

https://cern.zoom.us/j/61585612649?pwd=FoLJQF7A3uVaG1ss9JoguyXrFeYHYY.1

antiproton_lariat_seminar_feb_2025.pdf