Strongly interacting dynamics and the search for new physics at the LHC

Appelquist, Thomas; Brower, Richard C.; Fleming, George; Hasenfratz, Anna; Jin, Xiao-Yong; Kiskis, Joe; Neil, Ethan T.; Osborn, James C.; Rebbi, C.; Rinaldi, Enrico; Schaich, David; Vranas, P.; Weinberg, Evan; Witzel, Oliver

doi:10.1103/physrevd.93.114514

Cited by 135 publications

(189 citation statements)

References 55 publications

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“…The masses M π and M d can be found by measuring the exponential fall of appropriate correlation functions, and F π can be extracted from simulations of the axial-vector current correlator. It is defined using the same conventions as in [15]. The extraction of F d from a lattice measurement of a correlation function in the underlying gauge theory has not yet been reported.…”

Section: Jhep07(2017)035mentioning

confidence: 99%

“…This is consistent with the estimate of finite-volume and lattice-discretization artifacts reported in ref. [15]. In addition, there are systematic uncertainties associated with the EFT we employ.…”

Section: Application To the Lsd Datamentioning

confidence: 99%

“…In this paper, we develop such a framework for comparison with existing lattice results as well as future simulations. Lattice results have so far been obtained for m values such that the NGB mass is of the same order as the scalar mass [15][16][17][18][19]. These, in turn, are relatively small compared to the masses of other composite states, so that the use of an EFT consisting of only these degrees of freedom should provide a good first approximation.…”

Section: Introductionmentioning

confidence: 99%

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Dilaton EFT framework for lattice data

Appelquist

Ingoldby

Piai

2017

J. High Energ. Phys.

133

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Abstract:We develop an effective-field-theory (EFT) framework to analyze the spectra emerging from lattice simulations of a large class of confining gauge theories. Simulations of these theories, for which the light-fermion count is not far below the critical value for transition to infrared conformal behavior, have indicated the presence of a remarkably light singlet scalar particle. We incorporate this particle by including a scalar field in the EFT along with the Nambu-Goldstone bosons (NGB's), and discuss the application of this EFT to lattice data. We highlight the feature that data on the NGB's alone can tightly restrict the form of the scalar interactions. As an example, we apply the framework to lattice data for an SU(3) gauge theory with eight fermion flavors, concluding that the EFT can describe the data well.

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Section: Jhep07(2017)035mentioning

confidence: 99%

Section: Application To the Lsd Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dilaton EFT framework for lattice data

Appelquist

Ingoldby

Piai

2017

J. High Energ. Phys.

133

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“…In view of this it is especially interesting that lattice studies of near-conformal strong gauge theories report evidence of a scalar state that is significantly lighter than what occurs in QCD-like theories. Three groups [1][2][3][4][5] find that an SU(3) gauge theory with a sufficient number of light fermions generates a light singlet scalar state with a mass similar to the mass of the pseudoscalar state over the range of explicit fermion masses that have been studied. These groups also claim that this occurs in a phase with dynamical chiral symmetry breaking.…”

Section: B Numerics 12mentioning

confidence: 99%

A bound state model for a light scalar

Holdom

Koniuk

2017

J. High Energ. Phys.

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Recent lattice studies of near-conformal strong dynamics suggest the existence of a light scalar. This provides motivation to consider a simple Hamiltonian-based boundstate model where the pseudoscalar, scalar, vector and axial-vector states are treated on an equal footing. The model interpolates between the non-relativistic limit and the highly relativistic chiral limit, where the pseudoscalar mass drops to zero. The fermion mass becomes purely dynamical at this point. When the gauge coupling is constant over a moderate range of scales the scalar becomes significantly lighter than the spin 1 states as the chiral limit is approached. We relate this result to the behavior of the form factors of the respective states and their decay constants. In the conformal limit of the model all masses vanish and the theory is characterized by scaling dimensions.

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“…Except for relating F π to the vacuum expectation value (vev) of the SM, there is no free parameter in our model resulting in high predictivity. Of special interest is the iso-singlet scalar (0 ++ ) meson because in dilaton-like scenarios it is the candidate for the Higgs boson and numerical investigations of conformal or near-conformal theories have found that it is much lighter than the vector resonance, often degenerate or even below the pseudoscalar [11,14,[17][18][19][20]. Determining the mass of the iso-singlet scalar is challenging because the iso-singlet scalar has the same quantum numbers as the vacuum.…”

Section: The Four Plus Eight Model and The Iso-singlet Scalarmentioning

confidence: 99%

Large scale separation and hadronic resonances from a new strongly interacting sector

Hasenfratz

Rebbi

Witzel

2017

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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A large separation of scales is frequently required by theories describing physics beyond the Standard Model. In mass-split models with some massless (light) and some heavy flavors, large scale separation arises by construction if the system is conformal in the ultraviolet but chirally broken in the infrared. Due to the presence of a conformal fixed point, such chirally broken systems show hyperscaling and have a highly constrained resonance spectrum that is significantly different from the QCD spectrum. We present numerical evidence for hyperscaling of both lightlight and heavy-heavy meson resonances and show that they only depend on the ratio of the light and heavy flavor masses. The heavy-heavy spectrum is qualitatively different from QCD. The mass of heavy-heavy quarkonia e.g. is not proportional to the constituent quark mass.

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Strongly interacting dynamics and the search for new physics at the LHC

Cited by 135 publications

References 55 publications

Dilaton EFT framework for lattice data

Dilaton EFT framework for lattice data

A bound state model for a light scalar

Large scale separation and hadronic resonances from a new strongly interacting sector

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