Browsing by Author "Moretti, Stefano"
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- Charged higgs bosons in single top production at the LHCPublication . Guedes, Renato; Moretti, Stefano; Santos, RuiWe show that a light charged Higgs boson signal via tau(+/-)nu decay can be established at the Large Hadron Collider (LHC) also in the case of single top production. This process complements searches for the same signal in the case of charged Higgs bosons emerging from t (t) over bar production. The models accessible include the Minimal Supersymmetric Standard Model (MSSM) as well a variety of 2-Higgs Doublet Models (2HDMs). High energies and luminosities are however required, thereby restricting interest on this mode to the case of the LHC running at 14TeV with design configuration.
- Optimising charged Higgs boson searches at the Large Hadron Collider across b(b)over-barW(+/-) final statesPublication . Moretti, Stefano; Santos, Rui; Sharma, PankajIn the light of the most recent data from Higgs boson searches and analyses, we re-assess the scope of the Large Hadron Collider in accessing heavy charged Higgs boson signals in b¯bW±final states, wherein the contributing channels can be H+→t¯b, hW±, HW±and AW±. We consider a 2-Higgs Doublet Model Type-II and we assume as production mode bg→tH−+c.c., the dominant one over the range MH±≥480GeV, as dictated by b →sγconstraints. Prospects of detection are found to be significant for various Run2 energy and luminosity options.
- Signal to background interference in pp -> tH( -)-> tW( - )b(b)over-bar at the LHC Run IIPublication . Arhrib, Abdesslam; Benbrik, Rachid; Moretti, Stefano; Santos, Rui; Sharma, PankajWe investigate in the Large Hadron Collider (LHC) environment the possibility that sizeable interference effects between a heavy charged Higgs boson signal produced via bg -> tH(-) (+c.c.) scattering and decaying via H--> W(-)A -> W- b(b)over-bar (+c.c.) and the irreducible background given by bg -> tW(-) b(b)over-bar topologies could spoil current search approaches where the former and latter channels are treated separately. The rationale for this comes from the fact that a heavy charged Higgs state can have a large width, which can also happen for the CP-odd neutral Higgs state emerging in the ensuing decays, which in turn enables such interferences. We conclude that effects are very significant, both at the inclusive and exclusive level (i.e., both before and after H-+/- selection cuts arc enforced, respectively) and typically of a destructive nature. This, therefore, implies that currently established LHC reaches for heavy charged Higgs bosons require some level of resealing. However, this is possible a posteriori, as the aforementioned H-+/- selection cuts shape the interference contributions at the differential level in a way similar to that of the isolated H-+/- signal, so there is no need to reassess the efficiency of the individual cuts. We show such effects quantitatively by borrowing benchmark points from different Yukawa types of a 2-Higgs doublet model parameter space for H-+/- values starting from around 200 GeV.
- Signal versus background interference in H+ → t¯b signals for MSSM benchmark scenariosPublication . Arhrib, Abdesslam; Azevedo, Duarte; Benbrik, Rachid; Harouiz, Hicham; Moretti, Stefano; Patrick, Riley; Santos, RuiIn this paper, we investigate sizeable interference effects between a heavy charged Higgs boson signal produced dominantly via gg -> tbH- (+ c.c.) followed by the decay H--> bt (+ c.c.) and the irreducible background given by pp -> ttbb 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.