Search for a Singly Produced Excited Bottom Quark Decaying to a Top Quark and W Boson at $\sqrt{s}$ =13TeV with the CMS Experiment

Author: 
Alexander Fröhlich
Date: 
Nov 2017

Thesis Type:

Abstract A search for a singly produced excited bottom quark b* decaying to a top quark and a W boson in the muon+jets decay channel in proton-proton collisions at $\sqrt{s}$= 13TeV ispresented. The analyzed dataset has been recorded by the CMS experiment in 2016 and corresponds to an integrated luminosity of 35.87 fb−1. This is the first search for new physics to use the HOTVR top tagger. The capabilities of the HOTVR top tagger are demonstrated and a comparison to another top tagging algorithm is given. No significant excess of data over the Standard Model prediction is observed. Upper limits on the b* production cross section at 95% confidence-level are set. These limits are used to exclude b* quarks for purely left-handed, purely right-handed and vector-like benchmark couplings up to masses of 2050 GeV/c2, 2150 GeV/c2 and 2350 GeV/c2, respectively. Furthermore, the sensitivity of this search to a singly produced vector-like B0 quark decaying to a top quark and a W boson in the muon+jets decay channel is demonstrated and upper cross section limits are set.