Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 102: Flavourphysik 3

T 102.8: Talk

Thursday, March 30, 2017, 18:30–18:45, JUR 490

The secondary vertex finding algorithm with the ATLAS detector — Nello Bruscino, Julien Caudron, Markus Cristinziani, Mazuza Ghneimat, Carlo Alberto Gottardo, •Sebastian Heer, Vadim Kostyukhin, Andrea Sciandra, and Kaven Yau Wong — Physikalisches Institut, Universität Bonn

The ability to identify jets with b-hadrons is essential for many physics analyses at the LHC. In ATLAS there are several algorithms available to tag jets induced by b-hadrons. The secondary vertex finding algorithm uses the information of the secondary decay vertex of the b-hadron. As b-hadrons have a sufficiently long lifetime, the distance to the primary vertex can be resolved in the detector. The secondary vertex finder is able to reconstruct one or more secondary vertices in a jet, depending on the physics problem.

This talk will describe the algorithm and the information that can be exploited from reconstructing secondary vertices. This information is fed to the higher-level b-tagging algorithms in ATLAS. The major updates of the algorithm, that lead to an improved performance are shown and compared to the LHC Run 1.