| ATLAS Slides | |
| Report number | ATL-PHYS-SLIDE-2018-964 |
| Title | Search for pair- and single-production of vector-like quarks in final states with at least one $Z$ boson decaying into a pair of electrons or muons in $pp$ collision data collected with the ATLAS detector at $\sqrt{s}=13\,$TeV |
| Author(s) | Freundlich, Elena Murielle (Fakultaet Physik, Technische Universitaet Dortmund, Dortmund) |
| Corporate author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Submitted to | Sixth Annual Conference on Large Hadron Collider Physics, Bologna, Italy, 4 - 9 Jun 2018 |
| Submitted by | elena.freundlich@cern.ch on 23 Oct 2018 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Free keywords | EXOTICS |
| Abstract | A search for pair and single production of vector-like quarks T and B with a leptonically decaying Z boson is presented. The data were collected in pp collisions at 13 TeV with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of $36.1 \text{fb}^{-1}$. A high momentum Z boson is reconstructed from a same-flavor pair of leptons, which carry opposite charge, and are created alongside a third generation quark, conserving the charge of vector-like T ($q_T=+\frac{2}{3}$) and B ($q_B=-\frac{1}{3}$) quarks. Final states with different multiplicities of leptons, large-R jets and b-tagged small-R jets alongside other selection criteria are used to discriminate the signal from background processes. Five channels are optimized on a topology with high object momenta and are then combined for pair and for single production separately. No excess above the Standard model expectation was found, which is why lower mass limits on vector-like T and B quarks at a 95% confidence level are derived for the singlet and doublet model. In case of the single production also limits on the coupling to the Standard Model quarks are set. |
Record created 2018-10-23, last modified 2018-10-24