Seminars of 2011

Past Seminars

LSND and MiniBooNE anomalies as a signal of heavy sterile neutrinos


Dr. Juan Carlos Helo

USM Viña del Mar, Chile

Sala de Juntas

Wednesday, September 21st, 2011 at 15:00

Abstract

We examine a recently proposed explanation of the LSND and MiniBooNEanomalies, given in terms of a radiatively decaying sterile neutrino N. We check compatibility of this scenario with the existing experimental data on radiative tau-lepton and K-meson decays. We also analyse perspectives to test this radiativelydecaying sterile neutrino model using different K-meson, D-meson and tau-lepton decays.

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Seminars of 2010

Past Seminars

Neutralino decaying dark matter


Dr. Diego Restrepo

U Antioquia

Sala de Reuniones del IFIC - 2 planta baja

Monday, January 11th, 2010 at 12:00

Abstract

In supersymmetric models extended with an anomalous $U(1)_H$
different R-parity violating couplings can yield an unstable
neutralino. We show that in this context astrophysical and
cosmological constraints on neutralino decaying dark matter forbid
bilinear R-parity breaking neutralino decays and lead to a class of
purely trilinear R-parity violating scenarios in which the
neutralino is stable on cosmological scales. We have found that
among the resulting models some of them become suitable to explain
the observed anomalies in cosmic-ray electron/positron fluxes.


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Seminars of 2009

Past Seminars


Oscillations of Mossbauer neutrinos


Joachim Kopp

Max-Planck-Institut fur Kernphysik, Heidelberg

Sala Seminarios IFIC (Edf. Institutos Paterna)

Thursday, January 8th, 2009 at 16:00

Abstract

Recently, Raghavan has proposed an experiment to study neutrinos emitted and absorbed in recoil-free processes. We discuss the theory of these "Mössbauer neutrinos", paying special attention to the oscillation phenomenology. In particular, we will show that, in spite of the extremely good energy resolution of the proposed experiment,
Mossbauer neutrinos can oscillate. After giving quantum mechanical arguments to support this statement, we will compute the oscillation probability of Mossbauer neutrinos, including localization and decoherence terms, in a
quantum mechanical wave packet model. We will then proceed to the calculation of the combined rate of Mossbauer neutrino emission, propagation and absorption in the framework of quantum field theory. This approach allows us to avoid making any a priori assumptions on the neutrino wave function, and it can easily describe the various effects that broaden the neutrino emission and absorption lines. Finally, we will also address the unrealistic, but theoretically extremely interesting, case of Mossbauer neutrinos affected only by natural line broadening and not by solid state effects.

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Seminars of 2008

Past Seminars

Ettore Majorana, its neutrino legacy and beyond: a genius at work


Salvatore Esposito

Univ. of Naples "Federico II" & INFN

Sala Seminarios IFIC

Friday, October 31st, 2008 at 11:00

Abstract

"In the world there are various categories of scientists: people of secondary or tertiary standing, who do their best but do not go very far. There are also those of high standing, who come to discoveries of great importance. But then there are geniuses like Galileo and Newton. Well, Ettore was one of them. Majorana had what no one else in the world has..." After a brief biographical sketch, in this talk I will focus on some major contributions by Majorana, mostly unknown, aimed at understanding one of the famous statements by Nobel laureate Enrico Fermi about his pupil (reported above).

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Seminars of 2007

Past Seminars

The Epoch of Reionization


Fabio Iocco

Kavli Inst. for Particle Astrophysics & Cosmology

Sala Seminarios IFIC

Wednesday, January 10th, 2007 at 12:00

Abstract

I will summarize the observational evidences of the epoch of Reionization, describing the main physical processes which contribute to such a phenomenon and presenting the astrophysical models invoked to explain this epoch. Eventually I will emphasize the connection between different observables and the future possibility to discriminate between different models.

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Seminars of 2005

Past Seminars


Supersymmetry breaking as the origin of flavor


Dr. Javier Ferrandis

Lawrence Berkeley National Laboratory

Seminari del IFIC

Wednesday, January 12th, 2005 at 12:00

Abstract

We present an effective flavor model for the radiative generation of fermion masses and mixings based on a SU(5)XU(2) symmetry. We argue that the original source of flavor breaking resides in the supersymmetry breaking sector. Flavor violation would be transmitted radiatively to the fermion Yukawa couplings at low energy through finite supersymmetric threshold corrections. If this is the case one could fit the fermion mass ratios and CKM matrix elements, suppress the dimension five operators which contribute to proton decay, solve the SUSY CP-problem and overcome the present constraints on supersymmetric contributions to flavor changing processes through an approximate radiative alignment between the Yukawa and the soft supersymmetry breaking sector. We will argue that this possibility is supported by recently discovered patterns between dimensionless fermion mass ratios and CKM elements. We present an effective flavor model for the radiative generation of fermion masses and mixings based on a SU(5)xU(2) symmetry. We assume that the original source of flavor breaking resides in the supersymmetry breaking sector. Flavor violation is transmitted radiatively to the fermion Yukawa couplings at low energy through finite supersymmetric threshold corrections. This model can fit the fermion mass ratios and CKM matrix elements, explain the non-observation of proton decay, solve CP-problems and overcome present constraints on susy contributions to flavor changing processes through an approximate radiative alignment between the Yukawa and the soft trilinear sector. The model predicts new relations between dimensionless fermion mass ratios in the three fermion sectors, and the quark mixing angles.

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Seminars of 2004

Past Seminars

Invisible Higgs Boson Decays in Spontaneously Broken R-Parity


Prof. Jorge Romão

Instituto Superior Tecnico, Lisboa

Seminari del IFIC

Wednesday, September 8th, 2004 at 15:00

Abstract

The Higgs boson may decay mainly to an invisible mode characterized by missing energy, instead of the Standard Model channels. This is a generic feature of many models where neutrino masses arise from the spontaneous breaking of ungauged lepton number at relatively low scales, such as spontaneously broken R-parity models. Taking these models as framework, we reanalyze this striking suggestion in view
of the recent data on neutrino oscillations that indicate non-zero neutrino masses. We show that, despite the smallness of neutrino masses, the Higgs boson can decay mainly to the invisible Goldstone boson associated to the spontaneous breaking of lepton number.
The search for invisibly decaying Higgs bosons should be taken into account in the planning of future accelerators,
such as the Large Hadron Collider and the Next Linear Collider.

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Seminars of 2003

Past Seminars


Reconstruction of Supersymmetric High Scale Theories


Dr. Werner Porod

Physik-Institut (Universitaet Zuerich)

Seminari del IFIC

Friday, January 17th, 2003 at 12:00

Abstract

We demonstrate how the fundamental supersymmetric theory at high energy scales can be reconstructed using precision data expected at future high energy collider experiments. We have studied a set of representative examples in this context: minimal supergravity; gauge mediated supersymmetry breaking; and superstring effective field theories.

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Seminars of 2002

Past Seminars


Neutrinos and Ultra-High Energy Cosmic Rays


Dr. Dmitry V. Semikoz

Max-Planck-Institut für Physik, Munich

Sala Seminarios IFIC (Edf. Institutos Paterna)

Tuesday, October 22nd, 2002 at 12:30

Abstract

In this talk I will discuss both neutrinos directly coming from astrophysical sources and neutrinos produced by ultra-high energy (UHE) protons in interactions with the cosmic microwave background radiation. I will also consider possible neutrino fluxes in several exotic UHE cosmic ray models and fluxes from individual sources. I will show that in a variety of cases the diffuse neutrino flux can be considerably higher than the earlier theoretical estimates. High neutrino fluxes would significantly increase the chances to detect UHE neutrinos with experiments currently under construction or in the proposal stage.

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Accomodations

For Visitors

 

 

Below we comment more on these options. For example, the closest accommodation options, walking distance from the IFIC-Paterna campus site are:

HOTEL TRAPEMAR These are two quiet and simple hotels are located in Burjassot, Trapemar and Los Silos, of the same chain. They are specially close to each other and to the univ. residence and the Burjassot-Paterna science campus of the U. of Valencia. They are well connected to the city center by the metro, tram and buses. Note that only Hotel Trapemar has a restaurant, not los Silos, but there are some bars and restaurants around, in addition to our own cantine or those in the Burjassot campus.

Residencia Campus Universitaria Campus Patrimonial Burjassot
Av.1ºde Mayo,4
46100 Burjassot (Valencia)
Tel: +34 963 160 092 / Fax: +34 963 631 183

This is a modern university accomodation, very close to the Burjassot-Paterna campus and very well communicated by public transport with Valencia. Rooms have a small kitchen and Wifi. The responsible person Cristina Mir Rubio.

Here is a local map showing the situation of Ver mapa más grande">RESA wrt IFIC and the surroundings.

The University of Valencia has Colegios Mayores, for example Col.legi Major Rector Peset is in the very center of Valencia, surrounded by historic locations, like the important Palau de la Generalitat or the nice Plaza de la Virgen. It is well communicated by public transport, tram or bus, with IFIC.

Some recommended hotels in Valencia havespecial fares for the University,In order to make a hotel room reservation in one of these, we suggest you to contact the travel agency Viajes el Corte Ingles (Valencia) via phone: +34 96 351 01 54 or or E-mail: csevalencia@viajeseci.es

Here is a list:

Downtown (price: around 80 euros with breakfast)

HOTEL ASTORIA **** (WiFi 24h-15euros)

HUSA REINA VICTORIA **** (WiFi 24h-15 euros, free Cable)

BEATRIZ REY DON JAIME **** (WiFi 24h-12 euros)

HUSA DIMAR **** (free WiFi)

HOTEL SILKEN PUERTA DE VALENCIA **** (free Cable)

HOTEL RENASA ***

North area (price: around 70 euros with breakfast)

EXPO *** (WiFi 24h-12 euros)

KRIS ABADIA *** (free Cable)

NH CENTER *** (WiFi 24h-17 euros)