Signal to background interference in 
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Arhrib, Abdesslam; Benbrik, Rachid; Moretti, Stefano; Santos, Rui; Sharma, Pankaj

doi:10.1103/physrevd.97.075037

Cited by 5 publications

(2 citation statements)

References 67 publications

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“…The current highest priority, in relation to charged Higgs boson searches at the LHC, is to further establish the H + → tb decay channel in the heavy mass region. With this in mind, using the framework of a generic 2HDM [30], we have investigated the possibility of having large interference effects between signals from a heavy charged Higgs boson via bg → tH − → tW − A → tW − bb (and similarly for h and H) and the irreducible background from bg → tW − bb processes. Therein, it was shown that such interference effects can modify any dedicated charged Higgs boson searches where signal and background are treated separately, which is the case for all aforementioned experimental analyses.…”

Section: Jhep10(2020)209mentioning

confidence: 99%

Signal versus background interference in $$ {H}^{+}\to t\overline{b} $$ signals for MSSM benchmark scenarios

Arhrib

Azevedo

Benbrik³

et al. 2020

J. High Energ. Phys.

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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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Section: Jhep10(2020)209mentioning

confidence: 99%

Signal versus background interference in $$ {H}^{+}\to t\overline{b} $$ signals for MSSM benchmark scenarios

Arhrib

Azevedo

Benbrik³

et al. 2020

J. High Energ. Phys.

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“…For instance, in the 2HDM-II, the current measurement of BR(B → X s γ) forces the charged Higgs boson mass to be larger than about 580 GeV [23] while in the 2HDM-I one can still obtain a H ± with a mass as low as 100−200 GeV provided that tan β ≥ 2. Note that, in type-II and -Y, if we allow b → sγ measurement at the 3σ level then it would imply a reduction on the charged Higgs bound from 580 GeV down to 440 GeV [24].…”

Section: B Constraints and Benchmark Pointsmentioning

confidence: 99%

Top quark polarization as a probe of charged Higgs bosons

2018

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We study the production and decay of a heavy charged Higgs boson in the bg → tH − and H − → bt processes at the Large Hadron Collider (LHC). We show that the chiral structure of the H − tb 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 ± 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.

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Status of the semileptonic B decays and muon g-2 in general 2HDMs with right-handed neutrinos

Iguro

Omura

2018

J. High Energ. Phys.

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In this paper, we study the extended Standard Model (SM) with an extra Higgs doublet and right-handed neutrinos. If the symmetry to distinguish the two Higgs doublets is not assigned, flavor changing neutral currents (FCNCs) involving the scalars are predicted even at the tree level. We investigate the constraints on the FCNCs at the one-loop level, and especially study the semileptonic B meson decays, e.g. B → D ( * ) τ ν and B → K ( * ) ll processes, where the SM predictions are more than 2σ away from the experimental results. We also consider the flavor-violating couplings involving right-handed neutrinos and discuss if the parameters to explain the excesses of the semileptonic B decays can resolve the discrepancy in the anomalous muon magnetic moment. Based on the analysis, we propose the smoking-gun signals of our model at the LHC. arXiv:1802.01732v2 [hep-ph] 1 Jun 2018The Standard Model (SM) succeeds in describing almost all of the experimental results. There is one Higgs doublet to break the electroweak (EW) symmetry, and the nonvanishing vacuum expectation value (VEV) of the Higgs field generates the masses of the gauge bosons and the fermions. We do not still understand the reasons why the EW scale is around a few hundred GeV and why the couplings between the Higgs field and the fermions are so hierarchical. The Higgs particle is, however, discovered at the LHC experiment, and the signal is consistent with the SM prediction [1,2]. Thus, we are certain that the SM describes our nature up to the EW scale.On the other hand, it would be true that the structure of the SM is so mysterious. In addition to the mystery of the origin of the Higgs potential and couplings, the structure of the gauge symmetry is also very non-trivial. The anomaly-free conditions are miraculously satisfied: it is not easy to add extra chiral fermions to the SM. In the bottom-up approach to the new physics, one possible extension is to add extra scalars, e.g. extra Higgs doublets, to avoid the inconsistency with the anomaly-free conditions. Such a simple extension opens up rich phenomenology, so that a simple extended SM with an extra Higgs doublet has been actually discussed since about 40 years ago [3][4][5][6][7][8][9][10].The extended SM, besides, has other interesting aspects, from the viewpoint of the top-down approach. If we consider the new physics that can solve the mysteries of the SM, we often find extra Higgs doublets. For instance, the supersymmetric extension predicts at least one more Higgs doublet. If we consider the extended gauge symmetry, such as SU (2) R , we find extra Higgs doublets that couple to the SM fermions in the effective lagrangian. If we assume that there are flavor symmetries at high energy, there would be many Higgs doublets that couple to the SM fermions flavor-dependently. Thus, it would be very interesting and important to study and summarize the predictions and the experimental constraints of the extended SM with extra Higgs doublets.Based on this background, we investigate not only the experimenta...

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Signal to background interference in pp→tH−→tW−b

Cited by 5 publications

References 67 publications

Signal versus background interference in $$ {H}^{+}\to t\overline{b} $$ signals for MSSM benchmark scenarios

Signal versus background interference in $$ {H}^{+}\to t\overline{b} $$ signals for MSSM benchmark scenarios

Top quark polarization as a probe of charged Higgs bosons

Status of the semileptonic B decays and muon g-2 in general 2HDMs with right-handed neutrinos

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