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T: Fachverband Teilchenphysik

T 88: Flavor Physik III

T 88.5: Vortrag

Donnerstag, 22. März 2018, 17:30–17:45, Z6 - SR 2.006

Improvements in JetFitter reconstruction algorithm — •Arunika Sahu — University of Wuppertal

The tagging of b jets is a key ingredient of data analysis in the realm of high energy physics. The long lifetime of b-hadrons and their relatively high mass are the main features which are exploited in b tagging algorithms.

The JetFitter algorithm belongs to the category of secondary vertex reconstruction algorithms. The topological structure of weak b and c hadron decays inside a jet are exploited. The assumption of the Jetfitter algorithm is that the primary vertex and the b and c hadron decay vertices all lie on the same line of flight path of b hadron.

In order to improve the performance of the algorithm, the rejection of the two track vertices corresponding to fake vertices formed in light jets, needs to be optimised. These fake vertices are mostly originating from interactions in detector material leading to production of long lived particles like Ks mesons and lambda baryons or photon conversions. The rejection of these fake vertices results in an improvement of the performance of the algorithm. This improvement has been studied and will be shown in this presentation.