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A facility to Search for Hidden Particles (SHiP) at the CERN SPS

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Observation of multiple volume reflection by different planes in one bent silicon crystal for high-energy negative particles

Multiple volume reflection by different planes passing through the 〈111〉 axis in a bent silicon crystal was observed for the first time for 150 GeV/c negative particles, π- mesons, at one of the secondary beams of the CERN SPS. The beam of π- mesons was de ...

2011

The nuMSM, leptonic asymmetries, and properties of singlet fermions

We study in detail the mechanism of baryon and lepton asymmetry generation in the framework of the νMSM (an extension of the Standard Model by three singlet fermions with masses smaller than the electroweak scale). We elucidate the issue of CP-violation in ...

2008

How to find neutral leptons of the nuMSM?

An extension of the Standard Model by three singlet fermions with masses smaller than the electroweak scale allows to explain simultaneously neutrino oscillations, dark matter and baryon asymmetry of the Universe. We discuss the properties of neutral lepto ...

2007

Search for excited leptons at LEP

Qian Wang, Aurelio Bay, Horst Vogel, Eduardo Sanchez, Zhirui Xu, Werner Lustermann, Liang Sun, Jian Zhao, Ji Hyun Kim, Zheng Wang, Matthias Weber, Xiao Wang

A search for charged and neutral excited leptons is performed in 217 pb(-1) of e(+)e(-) collision data collected with the L3 detector at LEP at centre-of-mass energies from 202 up to 209 GeV The pair- and single-production mechanisms of excited electrons, ...

Elsevier2003

Search for vμ → ve oscillations in the NOMAD experiment

Jean-Pierre Meyer

We present the results of a search for vμ → v e oscillations in the NOMAD experiment at CERN. The experiment looked for the appearance of ve in a predominantly vμ wide-band neutrino beam at the CERN SPS. No evidence for oscillations was found. The 90% conf ...

2003

Theories with gauge-mediated supersymmetry breaking

Riccardo Rattazzi

Theories with gauge-mediated supersymmetry breaking provide an interesting alternative to the scenario in which the soft terms of the low-energy fields are induced by gravity. These theories allow for a natural suppression of flavour violations in the supe ...

1999

Upper Bound on Hot Dark-Matter Density from So(10) Yukawa Unification

Riccardo Rattazzi

We study low-energy consequences of supersymmetric SO(10) models with Yukawa unification h(t) = h(N) and h(b) = h(tau). We find that it is difficult to reproduce the observed m(b)/m(tau) ratio when the third-generation right-handed neutrino is at an interm ...

1994