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T: Fachverband Teilchenphysik

T 69: Methods in Particle Physics IV

T 69.2: Talk

Thursday, March 19, 2026, 16:30–16:45, KH 00.020

Identification of low p_T b-hadrons at the ATLAS experiment — •Hagen Möbius — DESY, Zeuthen, Germany

The identification of b-hadrons in an event, called b-tagging, is an important part of the physics program of the ATLAS experiment, in particular for Standard Model precision measurements, studies of the Higgs boson and searches for physics beyond the Standard Model. The starting point for standard b-tagging techniques in the ATLAS experiment are jets, bundles of particles. This leads to constraints on the energy of both the b-hadron and the surrounding hadronic activity and consequently low p_T b-hadrons in a jet below the jet reconstruction threshold are not reconstructed.
This talk presents an algorithm with a jet-independent b-hadron identification strategy. The algorithm, called the NewVrtSecInclusiveTool, reconstructs secondary vertices that can be associated with the decay of low p_T b-hadrons. The procedure and performance of the algorithm are discussed. Furthermore, the origins of the tracks contributing to these secondary vertices are examined to assess the accuracy of the b-hadron reconstruction.

Keywords: b-tagging; vertex reconstruction; b-hadron; secondary vertex; tracking