This section places limits on the mass of the first Kaluza-Klein (KK) excitation of the gluon in warped extra dimension models with Standard Model fields propagating in the bulk. Bounds are given for a specific benchmark model with $\Gamma /\mathit m$ = 15.3$\%$ where $\Gamma $ is the width and $\mathit m$ the mass of the KK gluon. See the``Extra Dimensions” review for more discussion.

VALUE (TeV) CL% DOCUMENT ID TECN  COMMENT $\bf{> 3.8}$ 95 1 AABOUD 2018 BI ATLS ${{\mathit g}_{{KK}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit j}}$ • • We do not use the following data for averages, fits, limits, etc. • • 2 AABOUD 2019 AS ATLS ${{\mathit g}_{{KK}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$ $\rightarrow$ ${{\mathit j}}{{\mathit j}}$ 3 SIRUNYAN 2019 AL CMS ${{\mathit g}_{{KK}}}$ $\rightarrow$ ${{\mathit t}}{{\mathit T}}$ $> 2.5$ 95 4 CHATRCHYAN 2013 BM CMS ${{\mathit g}_{{KK}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$ 5 CHEN 2013 A ${{\overline{\mathit B}}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ $> 1.5$ 95 6 AAD 2012 BV ATLS ${{\mathit g}_{{KK}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit j}}$ 1  AABOUD 2018BI use 36.1 fb${}^{-1}$ of data from ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV. This result updates AAD 2013AQ. 2  AABOUD 2019AS use 36.1 fb${}^{-1}$ of data from ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV. An upper bound of 3.4 TeV is placed on the KK gluon mass for ${{\mathit \Gamma}}$ /${{\mathit m}}$ = 30$\%$. 3  SIRUNYAN 2019AL use 35.9 fb${}^{-1}$ of data from ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV to place limits on a KK gluon decaying to a top quark and a heavy vector-like fermion, T. KK gluon masses between 1.5 and 2.3 TeV and between 2.0 and 2.4 TeV are excluded for T masses of 1.2 and 1.5 TeV, respectively. 4  CHATRCHYAN 2013BM use 19.7 fb${}^{-1}$ of data from ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. Bound is for a width of approximately $15 - 20\%$ of the KK gluon mass. 5  CHEN 2013A place limits on the KK mass scale for a specific warped model with custodial symmetry and bulk fermions. See their Figures 4 and 5. 6  AAD 2012BV use 2.05 fb${}^{-1}$ of data from ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV.

References:

AABOUD 2019AS PR D99 092004 Search for heavy particles decaying into a top-quark pair in the fully hadronic final state in $pp$ collisions at $\sqrt{s} =$ 13 TeV with the ATLAS detector SIRUNYAN 2019AL EPJ C79 208 Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton+jets final state in pp collisions at $\sqrt{s} =$ 13 TeV AABOUD 2018BI EPJ C78 565 Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton?proton collisions at $\sqrt{s} = 13$   $\text {TeV}$ with the ATLAS detector CHATRCHYAN 2013BM PRL 111 211804 Searches for New Physics using the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Invariant Mass Distribution in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV Also PRL 112 119903 (errat.) Erratum to: CHATRCHYAN 2013BM. Searches for New Physics using the ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Invariant Mass Distribution in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV CHEN 2013A CP C37 063102 Constraint on the Warped Space from ${{\overline{\mathit B}}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ AAD 2012BV JHEP 1209 041 A Search for ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Resonances in Lepton+Jets Events with Highly Boosted Top Quarks Collected in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector