Charged Higgs Boson Production Research Articles

Pair production of charged MSSM Higgs bosons by gluon fusion

The production of pairs of charged Higgs bosons as predicted by the minimal supersymmetric standard model (MSSM) via the gluon fusion mechanism is investigated. The amplitudes at the leading one-loop order for the parton process gg -> H+ H- are calculated with the complete set of MSSM particles. Numerical results are presented for the cross section of the inclusive hadron process p p -> gg -> H+ H- + X at the LHC.

Yukawa corrections to the charged Higgs boson production in association with the top quark at hadron colliders

We calculate the Yukawa corrections of order $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ to charged Higgs boson production in association with a top quark at the Tevatron and the LHC. The corrections are not very sensitive to the mass of the charged Higgs boson and can exceed -20% for low values of $\tan\beta$, where the contribution of the top quark is large, and high values of $\tan\beta$ where the contribution of the bottom quark becomes large. These Yukawa corrections could be significant for charged Higgs boson discovery searches based on this production process, particularly at the LHC where the cross section is relatively large.

Higgs production in association with squark pairs in the Minimal Supersymmetric Standard Model at future hadron colliders

We study neutral and charged Higgs boson production in association with stop and sbottom squarks at the Large Hadron Collider, within the Supergravity inspired Minimal Supersymmetric Standard Model. The phenomenological relevance of such reactions is twofold. Firstly, they constitute a novel production mechanism of Higgs particles, either through a decay of a heavier (anti)squark into a lighter one or via a Higgs bremsstrahlung process. Secondly, their production rates are extremely sensitive to the values assumed by the five input parameters of the model, this possibly allowing one to put stringent constraints on the latter. After an exhaustive scan of the parameter space, we find that the majority of such processes could be detectable at high luminosity, provided \(\tan\beta\) is large, \(\tan\beta\gtrsim 30\) (except in the case of \(\tilde{t}_1\tilde{t}_1^*h\) and \(\tilde{t}_1\tilde{t}_2^*h\) final states, whose detection is also possible for smaller values), that the universal soft Supersymmetric breaking masses are in the ranges \(M_0 \lesssim 500\) GeV and \(M_{1/2} \lesssim 220\) GeV, and that the trilinear couplings are negative, \(A_0 < 0\). We also point out some sizable decay signatures and discuss their Standard Model (SM) backgrounds. Finally, we derive compact analytical formulae of the corresponding scattering matrix elements.

Higgs production: CP studies in $e^-e^-$ collisions

We review the production of scalar Higgs-like particles in high-energy electron–electron collisions, via the fusion of electroweak gauge bosons. The emphasis is on how to distinguish a CP-even from a CP-odd Higgs particle. Among the more significant differences, we find that in the CP-odd case, the Higgs spectrum is much harder, and the dependence of the total cross section on the product of the polarizations of the two beams much stronger, than in the CP-even case. We also briefly discuss parity violation, and the production of charged Higgs bosons.

Higgs production in association with squark pairs in the Minimal Supersymmetric Standard Model at future hadron colliders

We study neutral and charged Higgs boson production in association with stop and sbottom squarks at the Large Hadron Collider, within the Supergravity inspired Minimal Supersymmetric Standard Model. The phenomenological relevance of such reactions is twofold. Firstly, they constitute a novel production mechanism of Higgs particles, either through a decay of a heavier (anti)squark into a lighter one or via a Higgs bremsstrahlung process. Secondly, their production rates are extremely sensitive to the values assumed by the five input parameters of the model, this possibly allowing one to put stringent constraints on the latter. After an exhaustive scan of the parameter space, we find that the majority of such processes could be detectable at high luminosity, provided tan(beta) is large, tan(beta) > 30 (except in the case of \tilde{t}_1\tilde{t}_1^* h and \tilde{t}_1\tilde{t}_2^* h final states, whose detection is also possible for smaller values), that the universal soft Supersymmetric breaking masses are in the ranges M_0 < 500 GeV and M_{1/2} < 220 GeV, and that the trilinear couplings are negative, A_0 < 0. We also point out some sizable decay signatures and discuss their Standard Model (SM) backgrounds. Finally, we derive compact analytical formulae of the corresponding scattering matrix elements.

Triplet Higgs bosons production in e−e−-collisions

In the framework of models with Higgs triplets, doubly and singly charged triplet Higgs boson production in the processes e − e −→ δ −− L, R Z 0 and e − e −→ δ − L W − L are considered.

Radiation zeros and scalar particles beyond the standard model

Standard radiation zeros arise from the factorization properties of tree-level amplitudes involving a massless photon and can occur when all charged particles in the initial and final state have the same sign. We investigate how several different processes involving new scalar particles beyond the standard model may exhibit radiation zeros and how this structure might be exploited to probe their electromagnetic structure. We focus on (i) unnoticed aspects of angular zeros in the process e −+ e −→ Δ −−+ γ for doubly charged Higgs boson (or any bilepton) production and (ii) the process γ+ e −→ q+ S/ V for scalar ( S) or vector ( V) leptoquarks (LQs). We also discuss how factorized amplitudes and radiation zeros may appear in the gauge boson fusion production of non-conjugate leptoquark pairs via γ+W ±→S i+S j ∗ in high energy e ± e ± reactions and how the zeros affect the production cross-sections for various types of scalar leptoquarks.

Squark loop corrections to the charged Higgs boson pair production in photon-photon collisions

We calculate the squarks one-loop corrections to the cross sections of the chared Higgs boson pair production in photon-photon collisions in the minimal supersymmetric extension of standard model(MSSM). In general, in case of the large splitting in the masses of left-top squark and the right-top squark and for $\tan\beta$ near 1.5, the corrections can reduce the cross sections by more than 10% for a wide range of the charged Higgs boson mass, depending on the $e^+e^-$ center-of-mass energy. But in other cases, the corrections are at most only a few percent. Those corrections can be comparable to the $O(\alpha m_t^2/m_W^2)$ Yukawa corrections in previous literature.

Charged Higgs scalar production in the single-top-quark mode (and others) at futureepcolliders in the minimal supersymmetric standard model

We study charged Higgs boson production at future electron-proton colliders in the framework of the Minimal Supersymmetric Standard Model. We focus our attention to the case of single-top production and decay through the channel $t\to bH^\pm$ and of vector-scalar fusion via $W^{\pm*} \Phi^*\to H^\pm$ (where $\Phi=H,h$ and $A$). We consider the signature $H^\pm\to \tau\nu_\tau$ and compare it to the irreducible background from Standard Model interactions. For $M_{H^\pm}<m_t$, the $H^\pm$ signal is accessible through lepton universality breaking if $M_A<100-120$ GeV at both low and large values of $\tan\beta$. Furthermore, although the bulk of the production cross section comes from single-top events, a sizable contribution due to vector-scalar-scalar interactions should be observable at large $\tan\beta$, this possibly offering some insights into the structure of the scalar sector of the theory. The possibility of the CERN collider running in the LEPXLHC mode is considered in detail

Search for charged Higgs bosons in e+e− collisions at =130–172 GeV

A search is described to detect charged Higgs bosons via the process e + e − →H + H − , using data collected by the OPAL detector at center-of-mass energies of 130–172 GeV with a total integrated luminosity of 25 pb −1 . The decay channels are assumed to be H + → q q ′ and H + → τ + ν τ . No evidence for charged Higgs boson production is observed. The lower limit for its mass is determined to be 52 GeV at 95% confidence level, independent of the H + → τ + ν τ branching ratio.

Search for charged Higgs bosons in e+e− collisions at =172 GeV

This paper presents results on charged Higgs boson production, based on LEP data collected at s =172 GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV. The charged Higgs bosons are assumed to be pair produced and to decay either into a quark pair or into τν τ . The three different possible final states are included in the analysis. Data from ring imaging Cherenkov and microvertex detectors are used to identify the quarks as a cs pair. The number of candidates found is compatible with the background expected from standard processes. Combining the results of the present analysis with those of the previous analysis at lower energies, a new lower mass limit for the charged Higgs boson is set at 54.5 GeV/ c 2 .

Search for Charged Higgs Boson Decays of the Top Quark using Hadronic Decays of the Tau Lepton

This Letter describes a direct search for charged Higgs boson production in proton-antiproton collisions at sqrt(s)=1.8 TeV recorded by the Collider Detector at Fermilab. Two-Higgs-doublet extensions to the standard model predict the existence of charged Higgs bosons. In such models, the branching fraction for top quarks B(t --> H b --> tau nu b) can be large. This search uses the hadronic decays of the tau lepton in this channel to significantly extend previous limits on charged Higgs production.

Doubly charged Higgs boson production in e−e− collisions

In the framework of models with Higgs triplets, doubly charged Higgs boson production in the processes e − e − → δ L, R −− γ is considered.

Production of charged Higgs bosons of the minimal supersymmetric standard model inb-quark-initiated processes at the CERN Large Hadron Collider

We study integrated and differential rates for the production of charged Higgs bosons $H^\pm$ of the Minimal Supersymmetric Standard Model via b-quark initiated subprocesses in pp collisions at the Large Hadron Collider. In detail, we compute cross sections and distributions of the reactions: $bU \to bDH^+ \to bD\tau^+\nu_\tau\oplus C.C.$ and $bU \to bDH^+ \to bD t\bar b \to bDb\bar b {jj}\oplus C.C.$, for a $H^\pm$ scalar in the intermediate (i.e., $M^\pm<m_t+m_b$) and heavy (i.e., $M^\pm>m_t+m_b$) mass range, respectively (U and D represent generic u- and d-type light quarks). In the first case, a detailed treatment of various possible backgrounds is also given.

Pair production of charged Higgs bosons in gluon - gluon collisions

We studied the pair production rate of charged Higgs bosons via gluon - gluon collisions in the general two-Higgs-doublet model. The analysis of its production are made with possible parameter values of Higgs sectors in this model. We find that the production cross sections may be 4 to 41 femto barn in the future LHC pp collider with these parameters. The calculation also shows that this pair production process is not sensitive to the neutral Higgs masses, and therefore its measurement could not give more information about the neutral Higgs bosons.

Nonminimal supersymmetric Higgs bosons at CERN LEP 2.

We discuss the discovery reach of CERN LEP 2 for the Higgs sector of a general extension of the MSSM including a single gauge singlet field. This change introduces a new quartic Higgs boson self-coupling which can increase the masses of the {ital CP}-even states, and also allows mixing between singlet and nonsinglet states which can reduce the couplings of the mass eigenstates to the {ital Z}. The lightest {ital CP}-even Higgs boson is bounded by a parameter {Lambda} which takes a maximum value {Lambda}{sub max}{approx_equal} 136{endash}146 GeV for a top quark mass of 150{endash}195 GeV. We generalize the discussion of the bound to include the entire {ital CP}-even spectrum and show how experiment may exclude values of {Lambda} smaller than some {Lambda}{sub min}. {ital CP}-even Higgs boson searches at LEP 2 will be able to exclude {Lambda}{sub min}{approx_equal} 81{endash}105 GeV, depending on the machine parameters. We also present exclusion plots in the {ital m}{sub {ital A}}-tan{beta} plane, based on an analysis of {ital CP}-even, {ital CP}-odd, and charged Higgs boson production processes at LEP 2. {copyright} {ital 1996 The American Physical Society.}

Contribution of gluon fusion to the production of charged Higgs bosons at hadron colliders.

We study the production of the charged Higgs boson at future hadron colliders CERN (LHC) through the mechanism of gluon fusion (gg\ensuremath{\rightarrow}tb\ifmmode\bar\else\textasciimacron\fi{}${\mathit{H}}^{\mathrm{\ensuremath{-}}}$). This calculation is a good approximation for the complete allowed range of the charged Higgs boson mass. In particular, for ${\mathit{m}}_{\mathit{H}}$&gt;${\mathit{m}}_{\mathit{t}}$+${\mathit{m}}_{\mathit{b}}$ our resulting cross section is similar to the one obtained using the mechanism of gluon-b fusion, whereas for ${\mathit{m}}_{\mathit{t}}$&gt;${\mathit{m}}_{\mathit{H}}$+${\mathit{m}}_{\mathit{b}}$ our results reproduce the resonant behavior due to the decay t\ensuremath{\rightarrow}${\mathit{H}}^{+}$+b.

HIGGS BOSON DISCOVERY POTENTIAL BEYOND THE MINIMAL STANDARD MODEL

Detailed studies of neutral and charged Higgs boson pair production with full statistic detector simulations around [Formula: see text] with 500 pb−1 are presented in the context of a review of the Higgs boson discovery potential at LEP200. Already in the first phase of LEP200, a significant increase of the mass parameter space compared to LEP1 for the discovery of nonminimal Higgs bosons will be possible, while the mass range for the discovery of the minimal Standard Model Higgs boson will increase only marginally. The requirements for a decisive test of the Minimal Supersymmetric extension of the Standard Model (MSSM) at a later stage of LEP200 are discussed. A sensitivity mass range is given for charged Higgs bosons.

Charged Higgs boson production in e −e − collisions

We consider the production of two single charged Higgs bosons at TeV e −e − colliders within the framework of the two-Higgs-doublet extension to the standard model. If the relations among the masses and couplings found in the SUSY version of this model hold, we find cross-sections which are very sensitive to tan β= ν 2/ ν 1, and are highly suppressed by cancellations among the various contributions. In more general two-doublet models, the cancellations were found to be less important and generally larger cross-sections were obtained. Although the expected event rate for this process is small it provides a way to probe the details of the Higgs physics of the two-doublet model and the higher luminosities of e −e − machines may allow this reaction to be seen at statistically significant rates.

A search for charged Higgs bosons at tristan

Abstract We searched for pair production of charged Higgs bosons via e+e− annihilation, using data (23.3 pb−) collected by the TOPAZ detector in the energy range s = 52.0 – 61.4 GeV. We observed no evidence for charged Higgs pair production and extended the excluded region in the MH±BR (hadron) plane. The 95% CL lower mass limit is the most stringent for BR (hadron) = 0.6, giving mH±