Modified Higgs physics from composite light flavors

Delaunay, Cédric; Grojean, Christophe; Pérez, Gilad

doi:10.1007/jhep09(2013)090

Cited by 54 publications

(45 citation statements)

References 137 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…we have the mass matrix 12) where m ≡ λ Υ v/ √ 2, which we will assume to be real for simplicity. The above mass matrix is diagonalized by an O(2) rotation 13) where {X i } denote the mass eigenstates, and, c V ≡ cos θ V , s V ≡ sin θ V , with the mixing angle given by…”

Section: υ Modelmentioning

confidence: 99%

“…Vector-like families are not motivated only by string theory considerations, but also lower energy constructions such as top-quark seesaw models [4][5][6], warped extra dimensions (see for example ref. [7] and references therein), composite Higgs [8][9][10][11][12][13], little Higgs theories [14][15][16][17], and low-scale supersymmetry [18][19][20][21][22][23][24][25][26]. Ref.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications

Ellis

Godbole

Gopalakrishna

et al. 2014

J. High Energ. Phys.

107

View full text Add to dashboard Cite

With the renewed interest in vector-like fermion extensions of the Standard Model, we present here a study of multiple vector-like theories and their phenomenological implications. Our focus is mostly on minimal flavor conserving theories that couple the vector-like fermions to the SM gauge fields and mix only weakly with SM fermions so as to avoid flavor problems. We present calculations for precision electroweak and vector-like state decays, which are needed to investigate compatibility with currently known data. We investigate the impact of vector-like fermions on Higgs boson production and decay, including loop contributions, in a wide variety of vector-like extensions and their parameter spaces.

show abstract

Section: υ Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications

Ellis

Godbole

Gopalakrishna

et al. 2014

J. High Energ. Phys.

107

View full text Add to dashboard Cite

show abstract

“…Beyond-the-SM (BSM) physics can contribute to 2h production in a variety of ways, including anomalous tth (bbh) and tthh (bbhh) couplings [31][32][33][34][35][36][37][38], resonant enhancements [39][40][41][42][43][44][45][46][47][48], exotic decays [48,49] and new colored scalar [50][51][52][53][54][55] or fermonic [56][57][58][59][60][61][62] particles contributing to the loop amplitudes. Some of these effects, for example the modified tth couplings or new colored particles in the loop, also affect the single Higgs (1h) production in the gg → h channel.…”

mentioning

confidence: 99%

What’s in the loop? The anatomy of double Higgs production

2015

View full text Add to dashboard Cite

Determination of Higgs self-interactions through the double Higgs production from gluon fusion is a major goal of current and future collider experiments. We point out this channel could help disentangle and resolve the nature of ultraviolet contributions to Higgs couplings to two gluons.Analytic properties of the double Higgs amplitudes near kinematic threshold are used to study features resulting from scalar and fermionic loop particles mediating the interaction. Focusing on the hh invariant mass spectrum, we consider the effect from anomalous top and bottom Yukawa couplings, as well as from scalar and fermionic loop particles. In particular, the spectrum at high hh invariant mass is sensitive to the spin of the particles in the loop.

show abstract

“…This possibility leads to a series of interesting experimental consequences which have been partially discussed in ref. [31,32,[34][35][36][37]. We focus here on analysing signals which could be already probed by direct searches at the LHC.…”

Section: Jhep02(2014)055mentioning

confidence: 99%

“…Since we will only work at tree-level, we simply integrate the first term by parts in eq. (2.34) and use the quark equations of motion in order to obtain the u SM R −h−U lL coupling 36) where U l = U m . Note that the coupling structure of a fully composite u R is qualitatively similar to that of the partially composite case.…”

Section: Light Fourplet Partner Interactionsmentioning

confidence: 99%

Light non-degenerate composite partners at the LHC

Delaunay

Flacke

González-Fraile

et al. 2014

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract:We study the phenomenological implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu-Goldstone-boson Higgs models. We focus in particular on phenomenologically viable scenarios where the right-handed uptype quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. Since no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partner components dominantly decay to an electroweak gauge boson and a jet, a type of signature which has been analysed at the LHC. We have reinterpreted various ATLAS and CMS analyses in order to constrain the parameter space of this class of models. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is significantly different in models which deviate from the first two generation degeneracy paradigm, as charm quark parton distribution functions are suppressed relative to the up quark ones. We find that JHEP02 (2014)055 the right-handed charm quark component can be mostly composite together with their partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have partners as heavy as 2 TeV. Models where right-handed uptype quarks are fully composite fermions are also analysed and yield qualitatively similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. We demonstrate that in this case the fourplet bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.

show abstract

Modified Higgs physics from composite light flavors

Cited by 54 publications

References 137 publications

Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications

Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications

What’s in the loop? The anatomy of double Higgs production

Light non-degenerate composite partners at the LHC

Contact Info

Product

Resources

About