Search for single production of a vector-like quark via a heavy gluon in the $4b$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV

Abstract

A search is performed for the process $pp\to G^{\ast }\to B_H\bar{b}/{\bar{B}}_{H}b\to Hb\bar{b}\to b\bar{b}b\bar{b}$, predicted in composite Higgs scenarios, where $G^{\ast }$ is a heavy colour octet vector resonance and $B_H$ a vector-like quark of charge $-1/3$. The data were obtained from $pp$ collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.5 fb${}^{-1}$, recorded by the ATLAS detector at the LHC. The largest background, multijet production, is estimated using a data-driven method. No significant excess of events with respect to Standard Model predictions is observed, and upper limits on the production cross section times branching ratio are set. Comparisons to the predictions from a specific benchmark model are made, resulting in lower mass limits in the two-dimensional mass plane of $m_{G^{\ast }}$ vs. $m_{B_H}$.

36 pages, 5 figures, 5 tables. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-19

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• Implications of CTEQ global analysis for collider observables
• Light custodians in natural composite Higgs models
• Performance of $b$-Jet Identification in the ATLAS Experiment
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• Search for pair and single production of new heavy quarks that decay to a $Z$ boson and a third-generation quark in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure
• In-medium covariant propagator of baryons under a strong magnetic field: effect of the intrinsic magnetic moments

Cited by in corpus (17)

• Jet Flavor Classification in High-Energy Physics with Deep Neural Networks
• Vector-like Fermions and Higgs Effective Field Theory Revisited
• Search for single production of a vector-like T quark decaying to a Z boson and a top quark in proton-proton collisions at $\sqrt{s}=$13 TeV
• Search for single production of vector-like quarks decaying to a top quark and a W boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders
• Search for single production of vector-like quarks decaying to a b quark and a Higgs boson
• Search for single production of vector-like quarks decaying to a Z boson and a top or a bottom quark in proton-proton collisions at sqrt(s) = 13 TeV
• A new tagger for hadronically decaying heavy particles at the LHC
• Search for single production of vector-like top partners at the Large Hadron Electron Collider
• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• The $W\gamma$ decay of the elusive charged Higgs boson in the two-Higgs-doublet model with vectorlike fermions
• Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
• Vector-like Quarks at the Origin of Light Quark Masses and Mixing
• Vacuum stability in the Standard Model with vector-like fermions
• Single production of $X_{\pm 5/3}$ and $Y_{\mp 4/3}$ vectorlike quarks at the LHC
• Vector-like quarks and heavy coloured bosons at the LHC
• A note on blind technique for new physics searches in particle physics