750 GeV Diphoton Signal from One-Family Walking Technipion

Matsuzaki, Shinya; Yamawaki, Koichi

doi:10.48550/arxiv.1512.05564

Cited by 22 publications

(32 citation statements)

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“…The technidilaton as a composite Higgs has been shown [14][15][16] to be consistent with the present LHC 125 GeV Higgs, and the HLS vector mesons (walking technirhos) have also been shown [29] to be consistent with the LHC diboson events [23]. (We also showed [30] that one of the technipions can be identified consistently with the 750 GeV diphoton events at LHC [26] reported after the symposium).…”

Section: /33supporting

confidence: 76%

“…Due to the large anomalous dimension γ m ≃ 1, the mass of them are all enhanced to TeV region [64], which will be discovered at LHC Run II. (After this symposium, 750 GeV diphoton events were reported at LHC [26], which can be identified with the color-singlet and iso-singlet (not flavor-singlet) technipion P 0 [30,65]. If it is the case, M P 0 = 750 GeV, the model predicts another nearby color-singlet technipion P i (isotriplet one), with mass M P i = 8 5 M P 0 ≃ 950 GeV, a salient prediction of the one-family model independently of the dynamical details [64].…”

Section: Walking Technicolor and Technidilatonmentioning

confidence: 99%

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The origin of mass: horizons expanding from Nambu’s theory

Yamawaki

2016

Prog. Theor. Exp. Phys.

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The visible (Matter) has no difference from the invisible (Vacuum), the invisible has no difference from the visible. The visible is nothing but the invisible, the invisible is nothing but the visible.-Heart Sutra (translation by KY)Origin of mass may be strong dynamics of matter in the vacuum. Since the initial proposal of Nambu for the origin of the nucleon mass, the dynamical symmetry breaking in the strongly coupled underlying theories has been expanding the horizons in the context of the modern version of the origin of mass beyond the Standard Model (SM).The Nambu-Jona-Lasinio (NJL) model is a typical strong coupling theory with the non-zero critical coupling and a large anomalous dimension γ m = 2, in sharp contrast to its precedent model, the Bardeen-Cooper-Schrieffer theory for the superconductor. The non-zero critical coupling is also hidden in the asymptotically free gauge theories including QCD and walking technicolor: it reveals itself in the chiral symmetry restoration where the coupling cannot grow above the "hidden" critical coupling in the infrared region (infrared conformality).As is well known, the NJL model can be cast into the SM Higgs Lagrangian. We show that the SM Higgs Lagrangian is simply rewritten into a form of the (approximately) scale-invariant nonlinear sigma model, with both the chiral symmetry and scale symmetry realized nonlinearly, with the SM Higgs being nothing but the (pseudo-) dilaton. The SM Higgs Lagrangian is further gauge equivalent to the scale-invariant Hidden Local Symmetry (HLS) Lagrangian, s-HLS, having spin 1 bosons hidden in the SM.As the simplest possible underlying theory for the SM Higgs Lagrangian we first discuss the top quark condensate ("top-mode SM") based on the (scale-invariant) NJL model with only top (plus possibly bottom) coupling larger than the critical coupling, where the top-mode dilaton is the 125 GeV Higgs and the HLS gauge boson ("top-mode rho meson") (and the top-mode axion) may be detected at LHC.We then discuss the walking technicolor having near infrared conformality and large anomalous dimension γ m ≃ 1. Its effective theory is the s-HLS model precisely the same as the SM Higgs Lagrangian (with larger chiral symmetry), where the 125 GeV Higgs is successfully identified with the techidilaton. The 2 TeV diboson and 750 GeV diphoton excesses at LHC are identified with the HLS technirho and the technipion, respectively.

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Section: /33supporting

confidence: 76%

Section: Walking Technicolor and Technidilatonmentioning

confidence: 99%

The origin of mass: horizons expanding from Nambu’s theory

Yamawaki

2016

Prog. Theor. Exp. Phys.

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“…[54][55][56][57][58]. VC models have already been considered as the source of the diphoton resonance [8,[30][31][32][33][34][35][36]. Below we will briefly summarize the salient features in VC theories that are most relevant for the connection to the diphoton resonance.…”

Section: Hyperpionsmentioning

confidence: 99%

“…2 A large number of recent preprints have studied the 750 GeV bump in a wide variety of contexts. Particularly relevant to our discussion are works analyzing phenomenological signals correlated with a diphoton excess [6][7][8][9][10][11][12][13][14][15][16][17][18], the general discussion of perturbative models in [19][20][21][22][23][24][25][26][27], studies of quirks, quarkonia, and glueballs [28,29], and the considerable number of works on new pionlike states [8,[30][31][32][33][34][35][36] (likewise in the context of composite Higgs models [37][38][39][40]). Of course, the phenomenology related to this final state has been of interest even before the announcement of the excess near 750 GeV, see for example references [41,42].…”

Section: Introductionmentioning

confidence: 99%

Shedding light on diphoton resonances

et al. 2016

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The experimental and theoretical implications of heavy di-gauge boson resonances that couple to, or are comprised of, new charged and strongly interacting matter are investigated. Observation and measurement of ratios of the resonant di-gauge boson channels W W , ZZ, γγ, Zγ, and gg in the form of di-jets, provide a rather direct -and for some ratios a rather robust -probe of the gauge representations of the new matter. For a spin-zero resonance with the quantum numbers of the vacuum, the ratios of resonant W W and ZZ to γγ channels, as well as the longitudinal versus transverse polarization fractions in the W W and ZZ channels, provide probes for possible mixing with the Higgs boson, while di-Higgs and di-top resonant channels, hh and tt, provide somewhat less sensitivity. We present a survey of possible underlying models for di-gauge boson resonances by considering various limits for the mass of the new charged and strongly interacting matter fields as well as the confinement scale of new hyper-gauge interactions under which they may also be charged. In these limits, resonances may be included as elementary weakly coupled spin-zero states or can correspond to hyper-glueballs, hyper-onia, or pseudo-scalar hyper-mesons. For each of these cases, we make predictions for additional states that could be resonantly or pairproduced and observed at the Large Hadron Collider or in future collider experiments. Heavy di-gauge boson resonances can provide a unified explanation for a number of small discrepancies and excesses in reported data from the Large Hadron Collider.

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“…One of the plausible candidates to explain this excess is a heavy pion associated with new strong dynamics [5,6] (see also Refs. [7][8][9][10][11][12][13][14][15][16]). This model naturally explains the relatively large cross section of the diphoton signal, and the heavy pion φ couples with the standard model gauge bosons due to the chiral anomaly as φB µν Bµν and φW µν W µν .…”

Section: Introductionmentioning

confidence: 99%

LHC future prospects of the 750 GeV resonance

Sato

Tobioka

2016

Physics Letters B

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A quantitative discussion on the future prospects of the 750 GeV resonance at the LHC experiment is given using a simple effective field theory analysis. The relative size of two effective operators relevant to diphoton decays can be probed by ratios of diboson signals in a robust way. We obtain the future sensitivities of Zγ, ZZ and W W resonance searches at the high luminosity LHC, rescaling from the current sensitivities at √ s = 13 TeV. Then, we show that a large fraction of parameter space in the effective field theory will be covered with 300 fb −1 and almost the whole parameter space will be tested with 3000 fb −1 . This discussion is independent of production processes, other decay modes and total decay width.

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750 GeV Diphoton Signal from One-Family Walking Technipion

Cited by 22 publications

References 0 publications

The origin of mass: horizons expanding from Nambu’s theory

The origin of mass: horizons expanding from Nambu’s theory

Shedding light on diphoton resonances

LHC future prospects of the 750 GeV resonance

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