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- 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.
- Pseudoscalar decays to gauge bosons at the LHC and at a future 100 TeV colliderPublication . Arhrib, Abdesslam; Benbrik, Rachid; El Falaki, Jaouad; Sampaio, Marco; Santos, RuiWe discuss the search for a CP-odd scalar decaying into gauge bosons in the frameworks of a CP-conserving two-Higgs doublet model (2HDM) and of a 2HDM extended with a vectorlike quark (VLQ) at the Large Hadron Collider and at a future 100 TeV collider. The rate of decay of a pseudoscalar to Z bosons could be important to ascertain the CP nature of the scalars in the model. In the 2HDM A -> ZZ will be extremely hard to detect even at a future 100 TeV pp collider while in the 2HDM+ VLQ this decay can be probed even during the present LHC run. We further discuss all decays of the pseudoscalar into gauge bosons at the LHC and at a future 100 TeV collider in the alignment limit where the lightest scalar is the 125 GeV Higgs with SM-like couplings to the fermions and gauge bosons.