Colliders and neutrinos: the window into physics beyond the by Sally Dawson, Rabindra N Mohapatra

By Sally Dawson, Rabindra N Mohapatra

This ebook is a set of theoretical complex summer time institute lectures by means of international specialists within the box of collider physics and neutrinos, the 2 frontier components of particle physics at the present time. it's aimed toward graduate scholars and starting researchers, and as such, offers many pedagogical info now not in most cases on hand in normal convention complaints.

Contents: additional Dimensions (K Agashe); The overseas Linear Collider (M Battaglia); Astrophysical facets of Neutrinos (J F Beacom); Leptogenesis (M-C Chen); Neutrino Experiments (J M Conrad); String concept, String Model-Building, and String Phenomenology -- a realistic advent (K R Dienes); Theoretical features of Neutrino lots and Mixings (R N Mohapatra); looking for the Higgs Boson (D Rainwater); Z Phenomenology and the LHC (T G Rizzo); Neutrinoless Double Beta Decay (P Vogel); Supersymmetry in uncomplicated Particle Physics (M E Peskin).

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The reason is that the 5D gauge coupling constant is dimensionful so that the 5D loop expansion grows with energy: g52 E/ 16π 2 . 86) where we have set the brane terms to be small so that g4 ∼ g5 /sqrtR. Note that this cut-off is not much larger than the compactification scale since g4 ∼ 1 in the SM. Thus, we find that m2 (0) is suppressed relative to the A5 May 1, 2008 15:7 World Scientific Review Volume - 9in x 6in ch1 Kaustubh Agashe 38 2 mass2 in the case of a regular scalar by ∼ (ΛU V R)2 ∼ 16π/g42 : we do gain by going to A5 .

On the other hand, we know that the current SM needs to be extended by some New Physics. Models of electroweak symmetry breaking contain new particles in the energy domain below 1 TeV.

Thus, KK modes can be more easily produced at colliders (even though it is clear that the odd level KK modes have to be pair produced). Moreover, the lightest KK particle (LKP) is stable and can be a good dark matter candidate [26]. Finally, we mention the 5D Higgsless models [27], where EW symmetry itself is broken by boundary conditions like the breaking of 5D custodial isospin symmetry mentioned in lecture 4 [or the breaking SU (3) → SU (2)× U (1) considered in lecture 5 in order to obtain Higgs as A5 ].

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