Abstract
We examine the possibility that the recently discovered 125 GeV higgs-like resonance actually corresponds to a dilaton: the Goldstone boson of scale invariance spontaneously broken at a scale f. Comparing to LHC data we find that a dilaton can reproduce the observed couplings of the new resonance as long as f≈v, the weak scale. This corresponds to the dynamical assumption that only operators charged under the electroweak gauge group obtain VEVs. The more difficult task is to keep the mass of the dilaton light compared to the dynamical scale, Λ~4πf, of the theory. In generic, non-supersymmetric theories one would expect the dilaton mass to be similar to Λ. The mass of the dilaton can only be lowered at the price of some percent level (or worse) tuning and/or additional dynamical assumptions: one needs to suppress the contribution of the condensate to the vacuum energy (which would lead to a large dilaton quartic coupling), and to allow only almost marginal deformations of the CFT.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1-17 |
| Number of pages | 17 |
| Journal | European Physical Journal C |
| Volume | 73 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2013 |
Fingerprint
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Engineering (miscellaneous)
Cite this
A higgs-like dilaton. / Bellazzini, Brando; Csáki, Csaba; Hubisz, Jay; Serra, Javi; Terning, John.
In: European Physical Journal C, Vol. 73, No. 2, 2013, p. 1-17.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A higgs-like dilaton
AU - Bellazzini, Brando
AU - Csáki, Csaba
AU - Hubisz, Jay
AU - Serra, Javi
AU - Terning, John
PY - 2013
Y1 - 2013
N2 - We examine the possibility that the recently discovered 125 GeV higgs-like resonance actually corresponds to a dilaton: the Goldstone boson of scale invariance spontaneously broken at a scale f. Comparing to LHC data we find that a dilaton can reproduce the observed couplings of the new resonance as long as f≈v, the weak scale. This corresponds to the dynamical assumption that only operators charged under the electroweak gauge group obtain VEVs. The more difficult task is to keep the mass of the dilaton light compared to the dynamical scale, Λ~4πf, of the theory. In generic, non-supersymmetric theories one would expect the dilaton mass to be similar to Λ. The mass of the dilaton can only be lowered at the price of some percent level (or worse) tuning and/or additional dynamical assumptions: one needs to suppress the contribution of the condensate to the vacuum energy (which would lead to a large dilaton quartic coupling), and to allow only almost marginal deformations of the CFT.
AB - We examine the possibility that the recently discovered 125 GeV higgs-like resonance actually corresponds to a dilaton: the Goldstone boson of scale invariance spontaneously broken at a scale f. Comparing to LHC data we find that a dilaton can reproduce the observed couplings of the new resonance as long as f≈v, the weak scale. This corresponds to the dynamical assumption that only operators charged under the electroweak gauge group obtain VEVs. The more difficult task is to keep the mass of the dilaton light compared to the dynamical scale, Λ~4πf, of the theory. In generic, non-supersymmetric theories one would expect the dilaton mass to be similar to Λ. The mass of the dilaton can only be lowered at the price of some percent level (or worse) tuning and/or additional dynamical assumptions: one needs to suppress the contribution of the condensate to the vacuum energy (which would lead to a large dilaton quartic coupling), and to allow only almost marginal deformations of the CFT.
UR - http://www.scopus.com/inward/record.url?scp=84874091332&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84874091332&partnerID=8YFLogxK
U2 - 10.1140/epjc/s10052-013-2333-x
DO - 10.1140/epjc/s10052-013-2333-x
M3 - Article
AN - SCOPUS:84874091332
VL - 73
SP - 1
EP - 17
JO - European Physical Journal C
JF - European Physical Journal C
SN - 1434-6044
IS - 2
ER -