scholarly journals The minimal scale invariant extension of the Standard Model

2010 ◽  
Vol 2010 (9) ◽  
Author(s):  
Lisa Alexander-Nunneley ◽  
Apostolos Pilaftsis
Keyword(s):  
Standard Model ◽  
Scale Invariant ◽  
Invariant Extension ◽  
The Standard Model

TOP OFF THE UNPARTICLE

2008 ◽  
Vol 23 (16n17) ◽  
pp. 2579-2590 ◽  
Author(s):  
DEBAJYOTI CHOUDHURY ◽  
DILIP KUMAR GHOSH
Keyword(s):  
Fixed Point ◽  
Standard Model ◽  
Top Physics ◽  
Energy Scale ◽  
Scale Invariant ◽  
The Standard Model

The existence of an exactly scale invariant sector possessing a nontrivial infrared fixed point at a higher energy scale and its possible communication with the Standard Model particles through a heavy messenger sector has been shown to lead to curious unparticle effects. We demonstrate that top physics at the Tevatron can already constrain such theories. We also consider possible improvements at the LHC and delineate some striking signatures.

scholarly journals STANDARD MODEL WITH COSMOLOGICALLY BROKEN QUANTUM SCALE INVARIANCE

2010 ◽  
Vol 25 (03) ◽  
pp. 167-177 ◽  
Author(s):  
PANKAJ JAIN ◽  
SUBHADIP MITRA
Keyword(s):  
Perturbation Theory ◽  
Standard Model ◽  
Particle Physics ◽  
Scale Invariance ◽  
Hierarchy Problem ◽  
Scale Invariant ◽  
Scalar Particles ◽  
Cosmological Observations ◽  
The Standard Model ◽  
Physical Spectrum

We consider a locally scale invariant extension of the Standard Model of particle physics and argue that it fits both the particle and cosmological observations. The model is scale invariant both classically and quantum mechanically. The scale invariance is broken (or hidden) by a mechanism which we refer to as cosmological symmetry breaking. This produces all the dimensionful parameters in the theory. The cosmological constant or dark energy is a prediction of the theory and can be calculated systematically order by order in perturbation theory. It is expected to be finite at all orders. The model does not suffer from the hierarchy problem due to the absence of scalar particles, including the Higgs, from the physical spectrum.

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