Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Data, AI, Computing, Electronics VI (DAQ and Trigger)

T 55.8: Vortrag

Mittwoch, 2. April 2025, 18:00–18:15, VG 2.102

Reconstruction of photon conversion in rare decays — •Bernd Mumme — Physikalisches Institut, Heidelberg, Germany

Flavour changing decays involving the emission of an energetic photon are of great interest to study the peculiar flavour structure of the Standard Model and search for indirect signs of new dynamics at very high energy. Some of the most sensitive probes are the rare or forbidden flavour-changing neutral current decays of heavy fermions: b→ sγ, c→ uγ and τ→µγ. Rare decays involving a photon in the decay products are reconstructed through the dielectron pair they convert to. To efficiently detect these dielectron pairs significant upgrades are being implemented in LHCb’s trigger system to enhance efficiency. The trigger consists of a GPU-driven first high level trigger (HLT1) and a CPU-run second level trigger (HLT2). Improvements include the development of a new trigger line in HLT1 capable of reconstructing significantly displaced electrons from photon conversions in real time as well as incorporating these electron tracks in HLT2, both driven by modern machine learning techniques. These upgrades aim to maximize event selection efficiency and keep data throughput for rare decays manageable. This talk will outline the physics motivation for searches for flavour-changing neutral current decays and detail the technical developments in optimizing the LHCb trigger for these and similar rare decays.

Keywords: Lepton Flavour Violation; LHCb; Beyond Standard Model; Machine Learning