Description du projet
Un nouvel éclairage sur la matière noire
Les scientifiques ont depuis longtemps admis l’existence d’une matière noire invisible pour expliquer les influences gravitationnelles sur notre cosmos. La matière noire semble être six fois plus abondante que la matière visible «ordinaire». Cependant, comme elle n’absorbe, ne reflète ni n’émet de lumière, elle est difficile à détecter. La matière noire dite légère, c’est-à-dire plus légère que celle qui fait l’objet de la plupart des recherches, pourrait être la clé. En théorie, cette matière, qui a jusqu’à présent échappé aux détecteurs, constitue un monde parallèle différent de celui que nous connaissons. Le projet POKER, financé par l’UE, intensifie la recherche de cette matière grâce à de nouvelles approches qui pourraient permettre d’obtenir une signature de signal unique et un rendement de signal plus élevé, augmentant ainsi les chances de la détecter.
Objectif
"The goal of POKER is to establish and demonstrate a new approach to search for light dark matter, based on a missing energy measurement with a positron-beam, active thick-target setup. Light dark matter is the new compelling hypothesis that identifies dark matter with new sub-GeV ""Hidden Sector"" states, neutral under Standard Model interactions and interfacing with our world through a new force. Accelerator-based searches at the intensity frontier are uniquely suited to explore it. However, current and planned efforts are either limited by the low sensitivity or the high backgrounds. This calls for a major breakthrough in the field. The proposed approach overcomes this challenge. The new technique, based on light dark matter production through positron annihilation on atomic electrons, is characterized by a larger signal yield compared to previously explored reactions, and by a unique signal signature resulting from the underlying reaction dynamics: a peak in the missing energy distribution. The re-analysis of “traditional” electron-beam missing energy results, where low-energy secondary positrons are present, has already shown the potential of this technique. POKER will demonstrate its sensitivity by preparing and running a pilot experiment at the CERN H4 beamline with an optimized detector. The test must fulfill strong requirements: the active thick-target must be capable of detecting each impinging particle at very large (MHz) rate, with excellent energy resolution, and to operate in a high radiation dose environment. POKER will set the basis of the first optimized light dark matter search at a positron-beam facility, enabling sensitivity to a large variety of physics cases, from minimal models to more elaborate Hidden Sectors scenarios - such as the ""Strongly Interacting Massive Particles"" conjecture. The pilot run itself will explore a currently unknown territory in the Hidden Sector parameters space, strengthening even more the POKER physics case."
Champ scientifique
Mots‑clés
Programme(s)
Thème(s)
Régime de financement
ERC-STG - Starting GrantInstitution d’accueil
00044 Frascati
Italie