| Article | |
| Title | Dark sector searches at NA64-$e$ |
| Author(s) | Celentano, Andrea (INFN, Genoa) |
| Collaboration | NA64 Collaboration |
| Publication | 2024 |
| Number of pages | 6 |
| In: | PoS WIFAI2023 (2024) 014 |
| In: | Workshop Italiano sulla Fisica ad Alta Intensita (WIFAI 2023), Rome, Italy, 8 - 10 Nov 2023, pp.014 |
| DOI | 10.22323/1.457.0014 |
| Subject category | Nuclear Physics - Experiment ; Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; NA64 |
| Abstract | The Light Dark Matter (LDM) hypothesis identifies dark matter particles with new sub-GeV "Hidden Sector'' states, neutral under Standard Model interactions and interfacing with our world through a new force. In the simplest model, the new interaction is mediated by a massive vector particle, also called "dark photon'' ($A^\prime$), kinetically mixed with the ordinary photon. The NA64-$e$ experiment at CERN North Area conducts a dedicated search for Light Dark Matter by running a missing energy measurement with high energy electron and positron beams from SPS impinging on a active thick target.With a total statistics of about $10^{12}$ electrons-on-target already accumulated during the 2016-2022 period, NA64$-e$ was able to probe for the first time the target region of the parameter space motivated by cosmology for scalar and Majorana LDM, in the $A^\prime$ mass range between 1 MeV and 100 MeV. In parallel to the main electron-beam program, NA64$-e$ recently completed a first pilot run with a 100 GeV positron beam. The goal of the test was to experimentally demonstrate this new technique, characterized by an enhanced $A^\prime$ production by resonant annihilation of positrons with atomic electrons. With a total accumulated statistics of about $10^{10}$ positrons on target, the pilot run allowed NA64$-e$ to set competitive exclusion limits in the LDM parameter space.This document provides a summary of the latest results obtained by the aforementioned NA64$-e$ efforts, together with a description of the future plans for the experiment. |
| Copyright/License | CC-BY-NC-ND-4.0 |
Corresponding record in: Inspire
Записът е създаден на 2024-12-04, последна промяна на 2024-12-04