A study of muon-electron elastic scattering in a test beam

Giovanni Abbiendi , Giovanni Ballerini , Dipanwita Banerjee , Johannes Bernhard , Matteo Bonanomi (1) , Claudia Brizzolari , Luca G. Foggetta , Mateusz Goncerz , Fedor V. Ignatov , Marco Incagli , Marcin Kucharczyk , Umberto Marconi , Valerio Mascagna , Clara Matteuzzi , Riccardo Pilato , Dinko Pocanic , Michela Prest , Antonio Principe , Federico Ronchetti , Mattia Soldani , Roberto Tenchini , Erik Vallazza , Graziano Venanzoni , Mariusz Witek , Milosz Zdybal

1 LLR - Laboratoire Leprince-Ringuet

In 2018, a test run with muons in the North Area at CERN was performed, running parasitically downstream of the COMPASS spectrometer. The aim of the test was to investigate the elastic interactions of muons on atomic electrons, in an experimental configuration similar to the one proposed by the project MUonE, which plans to perform a very precise measurement of the differential cross-section of the elastic interactions. COMPASS was taking data with a 190 GeV π beam, stopped in a tungsten beam dump: the muons from these π decays passed through a setup including a graphite target followed by 10 planes of Si tracker and a BGO crystal electromagnetic calorimeter placed at the end of the tracker. The elastic scattering events were selected and analysed, and compared to expectations from MonteCarlo simulation. The agreement found was satisfactory and demonstrated that measuring the angles of the outgoing particles, a clean sample of elastic interaction could be identified.

Mots clés: electron muon: interaction; muon: secondary beam; calorimeter: electromagnetic; pi: decay; electron muon: elastic scattering; tracking detector; COMPASS; CERN SPS; differential cross section; spectrometer; beam dump; CERN Lab; tungsten; crystal; data analysis method; numerical calculations: Monte Carlo; experimental results

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

Giovanni Abbiendi, Giovanni Ballerini, Dipanwita Banerjee, Johannes Bernhard, Matteo Bonanomi, et al.. A study of muon-electron elastic scattering in a test beam. JINST, 2021, 16 (06), pp.P06005. ⟨10.1088/1748-0221/16/06/P06005⟩. ⟨hal-03164349⟩