Holographic technidilaton

Journal Article · Wed Sep 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.055007· OSTI ID:21421059

Haba, Kazumoto ^[1]; Matsuzaki, Shinya ^[2]; Yamawaki, Koichi ^[3]

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1. Department of Physics, Nagoya University, Nagoya, 464-8602 (Japan)
2. Department of Physics, Pusan National University, Busan 609-735 (Korea, Republic of)
3. Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya 464-8602 (Japan)

Technidilaton, a pseudo-Nambu-Goldstone boson of scale symmetry, was predicted long ago in the scale-invariant/walking/conformal technicolor (SWC-TC) as a remnant of the (approximate) scale symmetry associated with the conformal fixed point, based on the conformal gauge dynamics of ladder Schwinger-Dyson (SD) equation with nonrunning coupling. We study the technidilaton as a flavor-singlet bound state of technifermions by including the technigluon condensate (tGC) effect into the previous (bottom-up) holographic approach to the SWC-TC, a deformation of the holographic QCD with {gamma}{sub m{approx_equal}}0 by large anomalous dimension {gamma}{sub m{approx_equal}}1. With including a bulk scalar field corresponding to the gluon condensate, we first improve the operator product expansion of the current correlators so as to reproduce gluonic 1/Q{sup 4} term both in QCD and SWC-TC. We find in QCD about 10% (negative) contribution of gluon condensate to the {rho} meson mass. We also calculate the oblique electroweak S-parameter in the presence of the effect of the tGC and find that for the fixed value of S the tGC effects dramatically reduce the flavor-singlet scalar (technidilaton) mass M{sub TD} (in the unit of F{sub {pi}}), while the vector and axial-vector masses M{sub {rho}}and M{sub a{sub 1}} are rather insensitive to the tGC, where F{sub {pi}}is the decay constant of the technipion. If we use the range of values of tGC implied by the ladder SD analysis of the nonperturbative scale anomaly in the large N{sub f} QCD near the conformal window, the phenomenological constraint S{approx_equal}0.1 predicts the technidilaton mass M{sub TD{approx}}600 GeV which is within reach of LHC discovery.

• OSTI ID: 21421059
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevD.82.055007; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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