Boosted four-top production at the LHC : a window to Randall-Sundrum or extended color symmetry
arxiv(2024)
摘要
Scenarios seeking to address the issue of electroweak symmetry breaking often
have heavy colored gauge bosons coupling preferentially to the top quark.
Considering the bulk Randall-Sundrum as a typical example, we consider the
prospects of the first Kaluza-Klein mode (G^(1)) of the gluon being
produced at the LHC in association with a t t̅ pair. The enhanced
coupling not only dictates that the dominant decay mode would be to a t
t̅ pair, but also to a very large G^(1) width, necessitating the use
of a renormalised G^(1) propagator. This, alongwith the presence of large
backgrounds (specially t t̅ j j), renders a conventional cut-based
analysis ineffective, yielding only marginal significances of only around
2σ. The use of Machine Learning (ML) techniques alleviates this problem
to a great extent. In particular, the use of Artificial Neural Networks helps
us identify the most discriminating observables, thereby allowing a
significance in excess of 4σ for G^(1) masses of ∼ 4 TeV.
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