Machine Learning: Haeavy Flavour Tag in ATLAS.

The Higgs Boson was directly observed, only in its decay modes to the Gauge Bosons (photons, W and Z). No clear, direct signs for Higgs decaying to second generation elementary particles have been seen yet, by any of the experiments alone. Until we clearly observe the Higgs Boson decay to second generation particles, one would not get a clear evidence for the role of the BEH mechanism in giving mass to matter particles. The increase in the sensitivity of the ATLAS experiment to flavour tag, via the addition of an additional inner layer to the pixel detector, (IBL), is an open invitation for a Charm tag challenge. Though it looks like it will be hard to attain a sensitivity to observe a Standard Model Higgs decay to Charm quark in the ongoing Run 2 of the LHC within the next years, we can directly prove that the Higgs coupling to quarks is not universal, which by itself, is a great achievement.

Our group is developing a new charm tagger using advanced statistical methods (based on advanced Deep Learning). This tagger will be optimized to improve the performance of ATLAS in tagging heavy quarks and rejecting light quarks background. The tagger will then be used to establish a proof for non-universality of the Higgs Boson coupling and get us closer to the observation of Higgs decaying to Charm Quarks.

The researcht is done with the ATLAS detector at the Large hadron Collider , CERN.