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T: Fachverband Teilchenphysik

T 84: Search for Dark Matter IV

T 84.4: Vortrag

Donnerstag, 3. April 2025, 17:00–17:15, VG 4.102

Real-time search for Dark Photons at the Upgraded LHCb experiment — •Carlos Eduardo Cocha Toapaxi — Heidelberg University, Heidelberg, Germany

Different theoretical model predicts the existence of dark matter mediators which interact minimally with standard model particles. Charm decays are an excellent place to search for dark photons, one kind of light dark matter mediators. The challenge to reconstruct dark photons consists in finding a peak on top of an irreducible non-resonant background of several kHz. Here the search profites enormously from the novel real-time analaysis strategy implement at the LHCb experiment in Run 3. LHCb can read out the entire detector in real time (at 30 MHz) and filter interesting events through a two-stage software trigger using farms of GPUs (first stage) and CPUs (second stage). Sophisticated online selections are employed at both trigger stages to select charm decays, identify the extremely soft electrons that dark photons decay into, and reduce the overwhelming combinatorial background, followed by a dedicated offline selection. In this talk we present the trigger selections and initial sensitivity estimates for dark photons in LHCb Run 3.

Keywords: LHCb; CERN; dark photon; dark matter; trigger