We perform a comprehensive global analysis in the Minimal Supersymmetric Standard Model (MSSM) as well as in the 2-Higgs Doublet Model (2HDM) of the production and decay mechanisms of charged Higgs bosons (H ± ) at the Large Hadron Collider (LHC). Starting from the most recent experimental results (SM-like Higgs boson signal strengths and search limits for new Higgs boson states obtained at Run-1 and -2 of the LHC and previous colliders), from (both direct and indirect) searches for Supersymmetric particles as well as from flavor observables (from both e + e − factories and hadron colliders) and upon enforcing theoretical constraints (vacuum stability, perturbativity, unitarity), we present precise predictions for H ± cross sections and decay rates in different reference scenarios of the two aforementioned models in terms of the parameter space currently available, specifically mapped over the customary (m A,H ± , tan β) planes, including singling out specific Benchmark Points (BPs) amenable to phenomenological investigation. These include the m mod+ h and hMSSM configurations of the MSSM and the 2HDM Type-I, -II, -X and -Y. Such BPs are always close to (or coinciding with) the best fits of the theoretical scenarios to experimental data. We also briefly discuss the ensuing phenomenology for the purpose of aiding future searches for such charged Higgs boson states. 1The Higgs boson discovery of 2012 [1,2,3,4] at the CERN Large Hadron Collider (LHC) has led to the confirmation of the Standard Model (SM) as the proper theory of the Electro-Weak (EW) scale. However, there is much evidence that the SM is not appropriate at all scales, rather it should be viewed as an effective low-energy realization of a more complete and fundamental theory onsetting beyond the EW regime. Among the many proposals for the latter, one can list theories with some new symmetry, e.g., Supersymmetry (SUSY), or an enlarged particle content (e.g., in the Higgs sector), or both. Following the aforementioned discovery, no new particle has however been seen at the LHC, implying that new physics at the EW scale should be weakly interacting or that strongly interacting particles, if present, should lead to signatures involving soft decay products or in channels with overwhelming (ir)reducible backgrounds. We shall adopt here the first assumption.Many SM extensions possess in their spectra additional neutral and/or charged Higgs states. Amongst these, SUSY [5] is indeed considered the most appealing one as it addresses several shortcomings of the SM, including the problem of the large hierarchy between the EW and Planck scales. While the search for SUSY was unsuccessful during the first LHC run, the increase in the Center-of-Mass (CM) energy of the machine from 8 TeV to 13 TeV plus the additional luminosity of the second run are improving greatly the sensitivity to the new superparticles which are predicted. While the jury is still on these, we remind here the reader that SUSY also requires at least two Higgs doublets for a successful EW Symmetry B...

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In this paper, we investigate sizeable interference effects between a heavy charged Higgs boson signal produced dominantly via $$ gg\to t\overline{b}{H}^{-} $$ gg → t b ¯ H − (+ c.c.) followed by the decay $$ {H}^{-}\to b\overline{t} $$ H − → b t ¯ (+ c.c.) and the irreducible background given by $$ pp\to t\overline{t}b\overline{b} $$ pp → t t ¯ b b ¯ topologies at the Large Hadron Collider (LHC). We show that it may be possible that such effects could spoil current H± searches where signal and background are normally treated separately. The reason for this is that a heavy charged Higgs boson can have a large total width, in turn enabling such interferences, altogether leading to potentially very significant alterations, both at the inclusive and exclusive level, of the yield induced by the signal alone. This therefore implies that currently established LHC searches for such wide charged Higgs bosons might require modifications. We show such effects quantitatively using two different benchmark configurations of the minimal realisation of Supersymmetry, wherein such H± states naturally exist. However, on the basis of the limited computing resources available, we are unable to always bring the statistical error down to a level where all such interference effects are unequivocal, so that we advocate dedicated experimental analyses to confirm this with higher statistics data samples.

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In this talk an investigation into the interference effects between the process pp→t̄bH+ followed by the decay H+→tb̄ and the background process pp → tt̄bb̄ is presented. The level of interference in parts of the parameter space is shown to be high and as such it may spoil the results of typical analyses which treat signal and background as independent. This is shown for two benchmarks of the MSSM.