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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 detectorNello 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.

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