Chasing New Physics in Stacks of Soft Tracks

par Amit Chakraborty (Tata Institute of Fundamental Research)

jeudi 20 oct. 2016, 14:00 → 15:00 Europe/Paris

sommets (LAPTh)

In this talk, we will introduce a new variable $\xi$, namely the number of tracks associated with the primary vertex, which are not parts of the reconstructed objects such as jets/isolated leptons etc in the context of new physics searches in the channel monojet + missing transverse momentum (MET). In models such as in compressed supersymmetry, events are often characterized by a rather large number of soft partons from the cascade decays, none of which result in reconstructed objects. We find that $\xi$, binned in pT, can discriminate these new physics events from events due to Z+jets, the main background in the monojet + MET channel. We find that the information contained in soft tracks is largely uncorrelated with traditional variables such as the effective mass, MET, pT of the jet, etc. and, therefore, a MultiVariate analysis combining these variables help to increase the discovery potential by more than 200% (depending on the spectra, of course). Pileup robustness of this variable will also be discussed at the end.

 

See the associated paper here.