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Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at $ \sqrt{s}=8 $ TeV

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Black hole bound on the number of species and quantum gravity at CERN LHC

Michele Redi

In theories with a large number N of particle species, black hole physics imposes an upper bound on the mass of the species equal to M-Planck/root N. This bound suggests a novel solution to the hierarchy problem in which there are N approximate to 10(32) g ...

2008

Anomalies as a signature of extra dimensions

Alexey Boyarsky, Oleg Ruchayskiy

The anomaly cancellation condition of the Standard Model may be unnatural in theories with extra dimensions as an anomaly of a low-energy 4-dimensional theory can be canceled by an inflow from a bulk. This inflow may give rise to an observable effect at lo ...

2005

Vacuum decay on a brane world

Sylvain Bréchet

The bubble nucleation rate for a first order phase transition occurring on a brane world is calculated. Both the Coleman-de Luccia thin wall instanton and the Hawking-Moss instanton are considered. The results are compared with the corresponding nucleation ...

American Physical Society2005

Cargese lectures on extra-dimensions

Riccardo Rattazzi

I give a pedagogical introduction to the concepts and the tools that are necessary to study particle physics models in higher dimensions. I then give a more detailed presentation of warped compactifications and discuss their possible relevance to the hiera ...

Springer2005

Study of the e+e- → Ze+e- process at LEP

Aurelio Bay

The cross section of the process e+e- → Ze+e- is measured with 0.7 fb-1 of data collected with the L3 detector at LEP. Decays of the Z boson into quarks and muons are considered at centre-of-mass energies ranging from 183 GeV up to 209 GeV. The measurement ...

2003

Cosmic rays as probes of large extra dimensions and TeV gravity

Riccardo Rattazzi

If there are large extra dimensions and the fundamental Planck scale is at the TeV scale, then the question arises of whether ultrahigh energy cosmic rays might probe them. We study the neutrino-nucleon cross section in these models. The elastic forward sc ...

2002

Graviton loops and brane observables

Riccardo Rattazzi, Roberto Contino

We discuss how to consistently perform effective Lagrangian computations in quantum gravity with branes in compact extra dimensions. A reparametrization invariant and infrared finite result is obtained in a non trivial way. It is crucial to properly accoun ...

2001

Quantum gravity and extra dimensions at high-energy colliders

Riccardo Rattazzi

Recently it has been pointed out that the characteristic quantum-gravity scale could be as low as the weak scale in theories with gravity propagating in higher dimensions. The observed smallness of Newton's constant is a consequence of the large compactifi ...

1999