Using Alphabet Assisted Bump Hunt to Search for Z'->Zh->LLbb at √S=13 TeV with the CMS Detector

Yu-Hsiang Chang^1*, Shin-Shan Eiko Yu¹

¹Physics department, National Central University, Taoyuan City, Taiwan

* Presenter:Yu-Hsiang Chang, email:index0192@gmail.com

A search for a new particle Z' is performed in the data collected by the CMS detector in 2016 at the LHC center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.8/fb. The decay channel of Z' is focused on Z'->Z H, and the Higgs boson decays to b bar while the Z boson decays leptonically. Since the Higgs boson is highly boosted, the two b-quarks are collimated and thus reconstructed in a fat jet with a radius of 0.8. The double B-tagger algorithm and the Higgs mass window cut are applied to reduce the background events. The remaining background is estimated by the ALPHABET assisted Bump Hunting method, where the ALPHABET method constrains the event yields in the signal region and the fit in the control region constrains the shape in the signal region.

Keywords: lepton, bottom quark, highly boosted , ALPHABET method