Search for new phenomena in $t\bar{t}$ final states with additional heavy-flavour jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Search for new phenomena in $t\bar{t}$ final states with additional heavy-flavour jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS

Collaboration

Sep 29, 2016

63 pages

Published: 2016

Report number:

ATLAS-CONF-2016-104,
ATLAS-CONF-2016-104

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

CERN Document Server

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Abstract: (CDS)

A search for new phenomena in

t\bar{t}

final states with additional heavy-flavour jets is presented. The search targets a variety of signals, including the pair production of a vector-like top quark (

T

) with a significant branching ratio to a top quark and either a Standard Model Higgs boson or a

Z

boson; four-top-quark production, both within the Standard Model and in several new physics scenarios; and heavy Higgs bosons (neutral and charged) produced in association with, and decaying into, third generation quarks. The analysis uses

pp

collisions at \sqrt{s}=13\tev recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The dataset corresponds to an integrated luminosity of 13.2 fb

^{-1}

. Data are analysed in the lepton-plus-jets final state, characterised by an isolated electron or muon with high transverse momentum, large missing transverse momentum and multiple jets, as well as the jets+

E_{\text{T}}^{\text{miss}}

final state, characterised by multiple jets and large missing transverse momentum. The search exploits the high multiplicity of

b

-jets, the high scalar sum of transverse momenta of all final state objects, and the presence of boosted, hadronically-decaying resonances reconstructed as large-radius jets characteristic of signal events. In the absence of a significant excess above the Standard Model expectation, 95\% CL upper limits are derived for the signal models in a number of benchmark scenarios, in most cases significantly extending the reach of previous searches.

Note:

Preliminary results •
All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2016-104 •
Preliminary results

p p: scattering
p p: colliding beams
heavy quark: jet
top: pair production
top: vector particle
top: multiple production
transverse momentum: high
jet: bottom
bottom: particle identification
jet: multiplicity

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