Constraining anomalous Higgs boson interactions

Self Cite

139

176

The effective Lagrangian expansion provides a framework to study effects of new physics at the electroweak scale. To make full use of LHC data in constraining higher-dimensional operators we need to include both the Higgs and the electroweak gauge sector in our study. We first present an analysis of the relevant di-boson production LHC results to update constraints on triple gauge boson couplings. Our bounds are several times stronger than those obtained from LEP data. Next, we show how in combination with Higgs measurements the triple gauge vertices lead to a significant improvement in the entire set of operators, including operators describing Higgs couplings.

Section: Jhep07(2016)152mentioning

confidence: 99%

The gauge-Higgs legacy of the LHC Run I

Butter

Éboli

González-Fraile

et al. 2016

Self Cite

139

176

“…Since the Higgs with a mass of 125 GeV appears to be mostly a doublet scalar by all accounts [3][4][5][6][7][8][9][10], it is reasonable to consider a limit where the singlet and triplet scalars are much heavier than the doublet scalars so that the singlet/doublet or triplet/doublet mixing is small. As such, the singlet and triplet scalars can be integrated out of the low energy spectrum.…”

Section: Beyond the Mssmmentioning

confidence: 99%

Impersonating the Standard Model Higgs boson: alignment without decoupling

Carena

Low

Shah

et al. 2014

231

215

In models with an extended Higgs sector there exists an alignment limit, in which the lightest CP-even Higgs boson mimics the Standard Model Higgs. The alignment limit is commonly associated with the decoupling limit, where all non-standard scalars are significantly heavier than the Z boson. However, alignment can occur irrespective of the mass scale of the rest of the Higgs sector. In this work we discuss the general conditions that lead to "alignment without decoupling", therefore allowing for the existence of additional non-standard Higgs bosons at the weak scale. The values of tan β for which this happens are derived in terms of the effective Higgs quartic couplings in general twoHiggs-doublet models as well as in supersymmetric theories, including the MSSM and the NMSSM. Moreover, we study the information encoded in the variations of the SM Higgsfermion couplings to explore regions in the m A − tan β parameter space.

“…Constraints on these operators have been placed for subsets of operators [80][81][82][83][84][85][86][87][88][89] and in full global fits both before [90] and after [91][92][93] the Higgs discovery. 2 Many strong constraints come from electroweak precision tests (EWPT) [94][95][96] at LEP, and from triplegauge coupling (TGC) [91,92,97] measurements at LEP and the LHC.…”

Section: Jhep07(2014)036mentioning

confidence: 99%

Complete Higgs sector constraints on dimension-6 operators

Ellis

Sanz

You

2014

155

149

Constraints on the full set of Standard Model dimension-6 operators have previously used triple-gauge couplings to complement the constraints obtainable from Higgs signal strengths. Here we extend previous analyses of the Higgs sector constraints by including information from the associated production of Higgs and massive vector bosons (H+V production), which excludes a direction of limited sensitivity allowed by partial cancellations in the triple-gauge sector measured at LEP. Kinematic distributions in H+V production provide improved sensitivity to dimension-6 operators, as we illustrate here with simulations of the invariant mass and p T distributions measured by D0 and ATLAS, respectively. We provide bounds from a global fit to a complete set of CP-conserving operators affecting Higgs physics.