29 July 2019 to 2 August 2019
Northeastern University
US/Eastern timezone

A Search for Di-Leptonic Final State Vector-Like Quark Pair Production in 13 TeV pp Collisions using CMS Data

30 Jul 2019, 17:25
17m
Shillman 335 (Northeastern University)

Shillman 335

Northeastern University

Oral Presentation Beyond Standard Model Physics Beyond Standard Model

Speaker

Pamela Pajarillo (Rutgers State Univ. of New Jersey (US))

Description

We describe a search for the production of a pair of vector-like quarks (VLQ's) with masses greater than 1000 GeV/c$^2$in a di-lepton final state using data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS Experiment. The analysis is based on detection of a di-lepton pair from the decay of a $Z$ boson and is sensitive to events in which one VLQ decays to a $b$ quark and a $Z$ boson and the other to a $b$ quark and either a $Z$ or a Higgs boson. Requiring that the event kinematics are consistent with a di-leptonic $Z$ decay, with either a $Z$ or Higgs decaying to jets and that the reconstructed VLQ's have equal masses greatly reduces the background from Standard Model processes. We use a $\chi^2$ procedure based on the Higgs or $Z$ mass and the equality of the two VLQ masses to select the correct combinations of jets. Since for a highly boosted Higgs or $Z$, the two jets resulting from the daughter quarks might be merged to a single jet, we carry out two independent analyses depending on the number of observed jets. We present the expected exclusion limits from the combined analyses corresponding to 138 fb$^{-1}$ of integrated luminosity collected by CMS during the 2016, 2017 and 2018 run period.

Primary author

Pamela Pajarillo (Rutgers State Univ. of New Jersey (US))

Co-author

the CMS Collaboration

Presentation Materials