Strength of Weak Interactions at Very High Energies and the Higgs Boson Mass

Lee, Benjamin W.; Quigg, Chris; Thacker, H.B.

doi:10.1103/physrevlett.38.883

Cited by 629 publications

(643 citation statements)

References 12 publications

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“…Furthermore, low energy precision data also impose important constraints on the model parameters [9]. We take into account the following bounds to constrain the 2HDM parameters: 1 (i) Perturbative unitarity [6], corresponding to |a 0 (ϕ A ϕ B → ϕ C ϕ D )| < ξ (we take ξ = 1/2 in our analysis), where a 0 (ϕ A ϕ B → ϕ C ϕ D ) is the S-wave amplitude for the elastic scattering process ϕ A ϕ B → ϕ C ϕ D of the longitudinally polarized gauge bosons (and Higgs bosons). These conditions translate into constraints on the couplings λ i (i = 1 − 5) [7,8].…”

Section: Jhep04(2008)079mentioning

confidence: 99%

Light charged Higgs at the beginning of the LHC era

Barenboim

Paradisi

Vives

et al. 2008

J. High Energy Phys.

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The terascale will be explored with the start of the LHC. One of the most fundamental questions which we expect to be answered is the root of electroweak symmetry breaking and whether the Higgs mechanism is realized in nature or not. In this context we pose the question if existing experimental data still allow for a light non-minimal Higgs sector. We tackle this question first in the context of the two Higgs doublet model and then we concentrate in two supersymmetric models, the constrained MSSM and the MSSM with non-universal Higgs masses. In both supersymmetric scenarios, light pseudoscalar and light charged-Higgs bosons are still viable provided tan β is large. In this regime, we emphasize the importance of the constraints provided by the decay B → τ ν mediated by the chargedHiggs at tree-level. In addition we comment on generic predictions for hadronic colliders and indirect searches in such scenarios.

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Section: Jhep04(2008)079mentioning

confidence: 99%

Light charged Higgs at the beginning of the LHC era

Barenboim

Paradisi

Vives

et al. 2008

J. High Energy Phys.

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“…An upper limit can be determined using unitarity arguments, assuming the model's validity to high energy scales [14]. In the Standard Model, the two self-couplings are linked as the leading terms in eq.…”

mentioning

confidence: 99%

“…If we consider the Standard Model an effective theory, λ 0 stands for two otherwise free parameters, namely the trilinear and the quartic scalar self couplings. An upper limit can be determined using unitarity arguments, assuming the model's validity to high energy scales [14]. In the Standard Model, the two self-couplings are linked as the leading terms in eq.…”

mentioning

confidence: 99%

Quartic Higgs coupling at hadron colliders

2005

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The quartic Higgs self-coupling is the final measurement in the Higgs potential needed to fully understand electroweak symmetry breaking. None of the present or future colliders are known to be able to determine this parameter. We study the chances of measuring the quartic self-coupling at hadron colliders in general and at the VLHC in particular. We find the prospects challenging.The LHC and a future linear collider are widely regarded as an ideal combination of experiments to understand electroweak symmetry breaking, i.e. study the Higgs boson and measure its couplings to all Standard Model bosons and fermions. According to the electroweak precision data [1] we expect to discover and identify a light Standard Model Higgs boson at the LHC [2,3,4]. At the ILC we will be able to measure Higgs couplings to all Standard Model particles with great precision [5]. 1 A particularly exciting task is the measurement of the trilinear Higgs self-coupling: for a Standard Model Higgs boson heavier than 150 GeV this coupling can be measured at a luminosity-upgraded LHC (but not at the ILC) [7,8,9]. In contrast, for small Higgs masses around 120 GeV it can be measured at the ILC (but possibly not at the LHC) [10,11,12].Higgs potential at Colliders: The measurement of the Higgs self-coupling is crucial to determine the Higgs potential -the way we think the electroweak symmetry is broken. A general parameterization of the Higgs potential with one doublet Φ (as in the Standard Model) is [13]:where v = ( √ 2G F ) −1/2 is the vacuum expectation value, and G F is the Fermi constant. In the Standard Model,If we consider the Standard Model an effective theory, λ 0 stands for two otherwise free parameters, namely the trilinear and the quartic scalar self couplings. An upper limit can be determined using unitarity arguments, assuming the model's validity to high energy scales [14]. In the Standard Model, the two self-couplings are linked as the leading terms in eq.(1), namely λ 3 /λ 4 = v, and higher dimension operators are not expected to appear much below the Planck scale. If we allow for an intermediate scale Λ ≪ M Planck and include the higher dimensional terms n = 1, 2 both self couplings receive different corrections:In general, it is not even guaranteed that both self-couplings have to be positive, since the stability of the general Higgs potential is guaranteed by the sign of the highest power in the Higgs field alone.The relation between the Higgs mass and each self-coupling as well as between the two self-couplings can change dramatically when we move to the MSSM with its two Higgs doublets. If we replace the Standard Model Higgs with the light CP-even scalar h 0 the relation between the self coupling becomes λ 3h /λ 4h = v sin(β + α)/ cos 2α [15]. As usual, tan β is the ratio of the two vacuum expectation values and α is the mixing angle between the two Higgs scalars. However, if we assume a mass hierarchy between the light Higgs scalar and the remaining Higgs sector the difference to a Standard-Model like Higgs is very small.

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“…If one takes into account the self interaction of the Hi~gs as well es its interaction with other fermions and bosons, the self-coupling A is constrained. The one-loop correction to the Higg potential leads to the bound (5) ( 6) giving mH > 2.3 GeV. In order to get a real is tic estimate it is necessary to take into account the • r energy reso i ut wn or the macn 1 ne Whl ch obeys -T a t:, tnus reouc 1 ng Lne r1e, 0'' c of the peak at ECM = mv.…”

Section: Introductionmentioning

confidence: 99%

Searching for Higgs at PETRA using the Wilczek mechanism

Ali

Mikenberg

1979

Z. Phys. C - Particles and Fields

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We present numerical estimates for the various signatures of a neutral Higgs particle produced in the radiative decays V + H + y, of a heavy vector onium state V(=J/~,T,Tt). We suggest to enhance the Higgs signal by requiring a correlation with weakly decaying states (T, charm, bottom) or with strange + -particles from charm and bottom. Rates for the processes e e + V + H + y + ~ 1 lepton + y + anything, : 2 kaons + y + anything are presented, and the effects of the lepton energy cuts on the first of the two processes are evaluated.

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Strength of Weak Interactions at Very High Energies and the Higgs Boson Mass

Cited by 629 publications

References 12 publications

Light charged Higgs at the beginning of the LHC era

Light charged Higgs at the beginning of the LHC era

Quartic Higgs coupling at hadron colliders

Searching for Higgs at PETRA using the Wilczek mechanism

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