HEPP Workshop 2019

Session

Session IV

31 Jan 2019, 14:00

Room 0017 (Nelson Mandela University)

16. H4l lepton isolation studies for the $H \rightarrow ZZ \rightarrow 4\ell$ channel

Onesimo Mtintsilana (University of the Witwatersrand (ZA))

31/01/2019, 14:00

Most of the interesting physics signatures at the LHC require the identification of prompt non-fake leptons or photons. Non-fake leptons are usually isolated and have no activity around them hence it is important to define an “isolation energy” around leptons to reduce any contamination from non-prompt and fake objects. In this proceeding, reoptimization studies have been performed to...

17. Search for a new resonance in the diphoton decay in association with $E_{\text{T}}^{\text{miss}}$ with the ATLAS detector

Shell-May Liao (University of the Witwatersrand (ZA))

31/01/2019, 14:20

A search for a new resonance motivated by strong deviations in the production of multiple leptons at the EW scale is conducted. The analysis is part and parcel of the Madala hypothesis whereby a heavy-scalar `H' decays to two photons, which is necessary to study a resonance diphoton mass peak of this scale. The analysis final state is therefore characterized by two photons and...

3. Top-quark background estimation for BSM search $H\rightarrow Sh\rightarrow 2\ell + >=2$ jets with the ATLAS detector

Jeremiah Kgomotso Monnakgotla (University of the Witwatersrand (ZA))

31/01/2019, 14:40

This proceeding presents the top-quark background estimation for the $H\rightarrow Sh$ search.$~$The final state for this search is characterized by two leptons (electron and muon) and at least two jets. The top-quark is the dominant background contribution for this analysis. The analysis strategy defines the Signal, Control and Validation Regions which are in the phase space of 0 $b$-jet,1...

29. $W$+jets fake background estimation using the fake factor method, for the BSM search $H\rightarrow Sh \rightarrow 2\ell$ + jets with the ATLAS detector

Lehumo Mashishi (University of the Witwatersrand (ZA))

31/01/2019, 15:00

The W+Jets(s) fake background estimation for $H\rightarrow Sh \rightarrow 2\ell$ + jets final state is presented. This paper focuses on the $W$+Jet(s) background estimation for the for the BSM search $H\rightarrow Sh \rightarrow 2\ell$ + >= 2 jets analysis with the ATLAS detector. Background processes that produce the same leptonic plus missing transverse energy signature in the detector,...

24. Search for physics beyond the Standard Model in events with two opposite charged leptons and jets at the LHC

Yesenia Hernandez Jimenez (University of the Witwatersrand (ZA))

31/01/2019, 15:50

The Madala hypothesis extends the Standard Model by introducing two additional scalar bosons: the Madala particle $H$ and the Higgs-like boson $S$. In this scenario physics beyond the Standard Model in the Higgs sector can be explored through the decay of the Madala particle into the $S$ and Higgs bosons. Several of the dominant decay channels of the $S$ and Higgs may produce a pair of...

34. What can $3\ell$ signatures at the LHC can tell us about additional bosons?

Kehinde Gbenga Tomiwa (University of the Witwatersrand (ZA))

31/01/2019, 16:10

As pointed out in a number of works, the LHC is displaying a number of anomalies in the production of multiple leptons in proton-proton collisions. A simplified model where a scalar, $H$, with a mass around the EW scale that decays predominantly to $Sh$, where $S$ is a EW singlet and $h$ is the Higgs boson in the Standard Model (SM), seems to do a reasonable job in capturing these anomalies....