Topic
Electroweak interaction
About: Electroweak interaction is a research topic. Over the lifetime, 16333 publications have been published within this topic receiving 468927 citations. The topic is also known as: electroweak force.
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TL;DR: In this article, a specific ensemble of particle masses and mixings that are in agreement with all current experimental bounds as well as minimize the contributions to electroweak precision observables is identified. But the authors do not consider the effects of the LHC on the Higgs phenomenology.
Abstract: In the light of the LHC, we revisit the implications of a fourth generation of chiral matter. We identify a specific ensemble of particle masses and mixings that are in agreement with all current experimental bounds as well as minimize the contributions to electroweak precision observables. Higgs masses between 115-315 (115-750) GeV are allowed by electroweak precision data at the 68% and 95% C.L. Within this parameter space, there are dramatic effects on Higgs phenomenology: production rates are enhanced, weak-boson-fusion channels are suppressed, angular distributions are modified, and Higgs pairs can be observed. We also identify exotic signals, such as Higgs decay to same-sign dileptons. Finally, we estimate the upper bound on the cutoff scale from vacuum stability and triviality.
290 citations
TL;DR: In this article, the leading radiative corrections to various weak interaction parameters due to new heavy particles were studied, using an effective chiral lagrangian and input from low energy QCD to confirm the large size of these effects in technicolor theories.
290 citations
TL;DR: In this article, the parameters of the Higgs potential, the top Yukawa coupling and the electroweak gauge couplings were extracted from data with full 2-loop NNLO precision.
Abstract: We extract from data the parameters of the Higgs potential, the top Yukawa coupling and the electroweak gauge couplings with full 2-loop NNLO precision, and we extrapolate the SM parameters up to large energies with full 3-loop NNLO RGE precision. Then we study the phase diagram of the Standard Model in terms of high-energy parameters, finding that the measured Higgs mass roughly corresponds to the minimum values of the Higgs quartic and top Yukawa and the maximum value of the gauge couplings allowed by vacuum metastability. We discuss various theoretical interpretations of the near-criticality of the Higgs mass.
286 citations
TL;DR: In this paper, the current status of theoretical and experimental constraints on the real Higgs singlet extension of the standard model is discussed and the impact of perturbative unitarity, electroweak precision data with a special focus on higher-order contributions to the Higgs boson mass, perturbativity of the couplings as well as vacuum stability.
Abstract: We discuss the current status of theoretical and experimental constraints on the real Higgs singlet extension of the standard model. For the second neutral (non-standard) Higgs boson we consider the full mass range from $$1~\mathrm{GeV}$$
to $$1~\mathrm{TeV}$$
accessible at past and current collider experiments. We separately discuss three scenarios, namely, the case where the second Higgs boson is lighter than, approximately equal to, or heavier than the discovered Higgs state at around $$125~\mathrm{GeV}$$
. We investigate the impact of constraints from perturbative unitarity, electroweak precision data with a special focus on higher-order contributions to the $$W$$
boson mass, perturbativity of the couplings as well as vacuum stability. The latter two are tested up to a scale of $$\sim $$
$$4 \times 10^{10}\,\mathrm{GeV}$$
using renormalization group equations. Direct collider constraints from Higgs signal rate measurements at the LHC and $$95\,\%$$
confidence level exclusion limits from Higgs searches at LEP, Tevatron, and LHC are included via the public codes HiggsSignals and HiggsBounds, respectively. We identify the strongest constraints in the different regions of parameter space. We comment on the collider phenomenology of the remaining viable parameter space and the prospects for a future discovery or exclusion at the LHC.
285 citations
TL;DR: It is shown that by starting with multi-TeV first or second and third generation scalars and trilinear soft breaking terms, the natural SUSY spectrum can be generated radiatively via renormalization group running effects.
Abstract: It has been argued that requiring low electroweak fine-tuning (EWFT) along with a (partial) decoupling solution to the supersymmetry (SUSY) flavor and $CP$ problems leads to a sparticle mass spectra characterized by light Higgsinos at 100--300 GeV, sub-TeV third generation scalars, gluinos at a few TeV, and multi-TeV first or second generation scalars (natural SUSY). We show that by starting with multi-TeV first or second and third generation scalars and trilinear soft breaking terms, the natural SUSY spectrum can be generated radiatively via renormalization group running effects. Using the complete 1-loop effective potential to calculate EWFT, significantly heavier third generation squarks can be allowed even with low EWFT. The large negative trilinear term and heavier top squarks allow for a light Higgs scalar in the $\ensuremath{\sim}125\text{ }\text{ }\mathrm{GeV}$ regime.
285 citations