Abstract
We study the production and decay of a heavy charged Higgs boson in the $bg\to tH^-$ and $H^-\to b\bar t$ processes at the Large Hadron Collider (LHC). We show that the chiral structure of the $H^-t\bar b$ vertex entering both stages is sensitive to the underlying Higgs mechanism of Electro-Weak Symmetry Breaking (EWSB) and we specifically demonstrate that one could distinguish between two popular realizations of a 2-Higgs Double Model (2HDM) embedding a new $H^\pm$ state, i.e., those with Type-I and -Y Yukawa couplings. The chiral structure of such a vertex, which is different in the two cases, in turn triggers a particular spin state of the top quark which is then transmitted to its decay products. Hence, both inclusive rates and exclusive observables can be used to extract the presence of such a charged Higgs boson state in LHC data.
Highlights
The top quark, discovered in the mid-1990s at the Tevatron by the D0 [1] and CDF [2] collaborations, is the heaviest elementary particle we know of
We show that the chiral structure of the H−tbvertex entering both stages is sensitive to the underlying Higgs mechanism of electroweak symmetry breaking (EWSB) and we demonstrate that one could distinguish between two popular realizations of a 2-Higgs doublet model (2HDM) embedding a new HÆ state, i.e., those with Type-I and -Y Yukawa couplings
One of the simplest SM extensions, embedding the established Higgs mechanism of electroweak symmetry breaking (EWSB), is the 2-Higgs doublet model (2HDM), which was proposed four decades ago and has eventually found its way as a low energy manifestation of a higher scale fundamental dynamics which could be made manifest in both direct searches for the new Higgs boson states that it predicts, e.g., at the Large Hadron Collider (LHC), and indirect tests in flavor physics
Summary
The top quark, discovered in the mid-1990s at the Tevatron by the D0 [1] and CDF [2] collaborations, is the heaviest elementary particle we know of. One of the simplest SM extensions, embedding the established Higgs mechanism of electroweak symmetry breaking (EWSB), is the 2-Higgs doublet model (2HDM), which was proposed four decades ago and has eventually found its way as a low energy manifestation of a higher scale fundamental dynamics which could be made manifest in both direct searches for the new Higgs boson states that it predicts, e.g., at the LHC, and indirect tests in flavor physics (for a theoretical and phenomenological review, see [6,7], respectively) In this scenario, two complex isodoublets are introduced to break the EW symmetry and eventually produce both fermion and gauge boson masses.
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