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).
Geo-particle physics: High energy cosmic rays to probe geological structures
Prof. Gennaro Miele
INFN-University of Naples
IFIC
Tuesday, October 28th, 2008 at 12:00
Abstract
In probing geological structures by means of the high energy cosmic radiation we can talk in terms of two fields defined by the particle probe chosen, namely muons produced by cosmic rays in their interaction with the atmosphere and cosmic neutrinos. We will review the main recent results in these two fields, by discussing in details the possibility to use a km3 Neutrino Telescope to explore the inner structure of our planet, and the fascinating possibility to use the atmospheric muons to make a tomography of volcanos . The inspection of the internal structure of a volcano edifice using muon radiography, with an imaging of the conduit system and its evolution with time, is potentially of strong interest since they represent crucial information to make predictions on a possible eruption. In this concern the scientific collaboration MU-RAY will be presented.
Probing massive neutrino physics at accelerators
Dr. Mauricio Magro
Fundacao Santo Andre, SP, Brasil
Sala de Juntas del IFIC Paterna
Thursday, January 31st, 2008 at 12:00
Abstract
Supersymmetric models with bilinear R-parity violation, where only leptonic number is broken, can give rise to neutrino masses and mixings in accordance with the present available data. At the Fermilab Tevatron and the Cern LHC the center-of-mass energy will be high enough to probe directly these models through the search of the superpartners of the Standard Model particles. We performed a study taking into account both Anomaly Mediated (AMSB) and Supergravity (mSUGRA) Supersymmetry breaking and the most recent neutrino oscillation experimental data. We anlyze the impact of R-parity violation in the canonical supersymetric searches due to the decay of the lightest neutralino via bilinear R-parity violation interactions. Depending on the R-parity breaking parameters the LSP can live long enough to reach the detector before decaying leaving a displaced vertex as a signal. We have studied the reach of Tevatron and LHC using the usual supersymmetric channels, multi-leptons channels and displaced vertices. We present our results as a scan over AMSB and mSUGRA parameters and demonstrated that when the neutralino lives long enough, displaced vertices can be the most useful channel for searching for such models.
Probing Non-standard Interactions of Neutrinos with Matter
by Future Long Baseline Experiments
Dr. Hiroshi Nunokawa
PUC – Rio de Janeiro
Sala de Juntas del IFIC Paterna
Tuesday, February 19th, 2008 at 12:00
Abstract
I discuss how and to which extent we can probe or constrain the non-standard interactions (NSI) of neutrinos with matter by future long baseline experiments. First I briefly discuss
the potential of superbeam experiment with Kamioka-Korea 2
detector system and then I move to the main focus of this talk, the potential of neutrino factories with 2 detector systems one at 3000 km and the other at 7000 km. We show that such 2 detector system can allow us to probe NSI without spoiling much the sensitivity to the determination of the standard mixing parameters.
21 cm in (a bit more than) a week
Urbano França
AHEP Group – IFIC
Monday, January 28th, 2008 at 17:00
Abstract
Internal & Informal seminar.
Sneutrino cold dark matter in extended MSSM models
Dr. Chiara Arina
INFN Torino
Sala de Juntas del IFIC Paterna
Monday, February 18th, 2008 at 12:00
Abstract
A thorough analysis of sneutrinos as dark matter candidates is perfomed,
in different classes of supersymmetric models, as is typically done for
the neutralino dark matter. First in the Minimal Supersymmetric Standard
Model, sneutrinos are marginally compatible
with existing experimental bounds, including direct detection, provided
they compose a
subdominant component of dark matter. Then supersymmetric models
with the inclusion of right-handed fields and lepton-number violating
terms are presented. Simple versions of the lepton-number-violating models
do not lead
to phenomenology different from the standard case when the neutrino mass
bounds
are properly included. On the contrary, models with right-handed fields
are perfectly viable: they
predict sneutrinos which are compatible with the current direct
detection sensitivities. I am going to show the
indirect
detection signals for such successful models: predictions for antimatter
and neutrino fluxes are provided and compared with existing and future
experimental sensitivities.
Informal Journal Club Neutrinos in A4 models
Dr. Stefano Morisi
AHEP Group – IFIC
Sala de Juntas del Edificio de Laboratorios IFIC
Friday, March 7th, 2008 at 15:30
Abstract
A multi-messenger approach to ultra-high energy cosmic ray sources
Dr. Ricard Tomàs
U Hamburg
Sala de Juntas del IFIC Paterna
Thursday, March 27th, 2008 at 15:30
Abstract
One of the most important challenges in astrophysics has been to
unveil the origin of ultra high energy cosmic rays (UHECRs). With
this respect the recently announced evidence of a correlation between the
arrival direction of UHECRs and nearby active galactic nuclei (AGN) by
the Pierre Auger Observatory (PAO) has implied a major step forward.
Nevertheless, the scarce number of events and the fact that UHECRs are
deflected by magnetic fields make it still difficult to use them to
identify individual sources.
In this talk I will summarize the importance of a multi-messenger
approach to overcome this problem, that is, the essential role that
the observation of gamma rays and neutrinos can play in understanding
where and how UHECRs are produced. For a successful “multi-messenger
astronomy” it is though crucial to know the connection between the
fluxes of UHECRs, gamma rays and neutrinos emitted by the source. As
an example I will discuss the case of astrophysical thick sources,
focusing on the interplay between the UHECRs and the neutrino fluxes.
Probing a Supersymmetric Model for Neutrino Masses at Ultrahigh Energy Neutrino Telescopes.
Prof. D. P. Roy
AHEP Group – IFIC
Sala de Juntas del IFIC Paterna
Tuesday, March 11th, 2008 at 12:00
Abstract
A bilinear R-Parity breaking SUSY model for neutrino mass and mixing predicts the lightest superparticle to decay mainly into a pair of tau leptons or b quarks along with a neutrino for relatively light SUSY spectra. This leads to a distinctive triple bang signature of SUSY events at ultrahigh energy neutrino telescopes like IceCube or Antares. While the expected signal size is only marginal at IceCube, it will be promising for a future multi-km^3 size neutrino telescope.
Sterile neutrino dark matter with gauged U(1)_(B-L)
Dr. Osamu Seto
Universidad Autonoma Madrid.
Sala de Juntas del IFIC Paterna
Tuesday, July 8th, 2008 at 16:00
Abstract
We point out a novel production process of sterile neutrino
as dark matter by a low scale gauged U(1)_{B-L}, because
the minimal production mechanism by the neutrino oscillation was
turned out not to be sufficient. As an application of this model,
511 keV gamma line emissions from galactic bulge,
so-called INTEGRAL anomaly, can be explained by its decay.
Lepton asymmetries and the growth of cosmological seed magnetic fields
Prof. Victor Semikoz
Izmiran
Seminari del IFIC
Friday, November 7th, 2008 at 12:00
Abstract
Primordial cosmological hypermagnetic fields polarize the early Universe plasma prior the electroweak phase transion (EWPT). As a result of the long range parity violating gauge interaction present in the Standard Model their magnitude gets amplified, opening a new perturbative way of seeding the primordial Maxwellian magnetic field at EWPT.
Soft Slepton Masses and A-terms from Discrete Lepton Flavor Symmetry
Prof. Morimitsu Tanimoto
Niigata University
Salon de actos Edf. Institutos Paterna
Tuesday, July 22nd, 2008 at 16:30
Abstract
We present the supersymmetric model with
$D_4\times Z_2$ lepton flavor symmetry.
The condition to realize the tri-bimaximal mixing is presented.
We evaluate soft supersymmetry breaking terms, i.e.
soft slepton masses and A-terms, which are predicted in this flavor model.
We consider constraints due to experiments of flavor changing
neutral current processes.
We also discuss the soft slepton masses and A-terms
and FCNC in $A_4$ models.
Discrete Symmetries and LFV
Dr. Luca Merlo
U Padova
Sala Seminarios IFIC (Edf. Institutos Paterna)
Monday, November 3rd, 2008 at 15:30
Abstract
I will present a flavour model for leptons based on the discrete non-Abelian group A4. In the first part, I will illustrate the construction of the model,
possible exstentions to the quark sector and the solution to the vacuum
alignment problem. In the second part, I will show the predictions of the
model for some LFV transitions, EDMs and MDMs. The analysis has been done in
two different scenarions: in the first one a low-energy operatorial approach
is used, where all the effects are dominated by dimension six operators; in
the second one an exact calculation of the relevant diagrammatics has been
done in a SUSY context. Interesting indications for the scale of new physics
and an upper limit on the leptonic \theta_13 of a few percent are concluded.
Gravitino Dark Matter with broken a R-Parity
Florian Staub
Unversitaet Wuerzburg
Sala de Juntas del IFIC Paterna
Tuesday, December 2nd, 2008 at 16:00
Abstract
In Gauge Mediated SUSY Breaking (GMSB) scenarios the Gravitino is the
lightest supersymmetric particle (LSP) and therefore a dark matter
candidate, but for Gravitinos with masses in the keV range the relic
density would be too high. This relic density could be reduced by the
entropy production of the late time decays of messenger and SUSY
particles.
Cosmic Neutrino Background: properties and detection perspectives
Dr. Gianpiero Mangano
INFN Naples
Sala de Juntas del IFIC Paterna
Tuesday, November 25th, 2008 at 12:00
Abstract
I’ll present a review of the present theoretical understanding
of the properties of the relic neutrino background and of experimental
challenges for its direct detection.
Cosmology and the Cosmic Microwave Background
Dr. Rafael Rebolo
IAC
Sala Seminarios IFIC (Edf. Institutos Paterna)
Thursday, July 17th, 2008 at 16:30
Abstract
Latest measurements of the Cosmic Microwave Background are reviewed along with their Cosmological implications
Solar occultations of energetic gamma-ray sources: from EGRET to GLAST
Dr. Timur Rashba
Max-Planck Munich
Sala de Juntas del IFIC Paterna
Tuesday, November 4th, 2008 at 15:30
Abstract
We discuss how the solar occultations of bright sources of energetic gamma rays can be used to extract non-trivial physical and astrophysical information, including the angular size of the image. We analyze the EGRET data and discuss prospects for other instruments. The Fermi Gamma Ray Space Telescope will be able to constrain the size of a possible halo around 3C 279 from observations it will make on October 8, 2008.
Cosmology and the Cosmic Microwave Background
Dr. Rafael Rebolo
IAC
Sala Seminarios IFIC (Edf. Institutos Paterna)
Thursday, July 17th, 2008 at 16:30
Abstract
Signals of a SUSY Warped Higgsless Model at the LHC
Laslo Reichert
Uni Wuerzburg
Sala Seminarios IFIC (Edf. Institutos Paterna)
Wednesday, November 5th, 2008 at 15:00
Abstract
In the near future experiments at the LHC will produce the first data and one ofthe main tasks will be the measurement of high energy physics, which provides information about the detailed dynamics of electroweak symmetry breaking (EWSB). Since there is no experimental verification of a fundamental scalar Higgs field,the question appears whether there are other possibilities of EWSB. Furthermore the minimal standard model (SM) gives no natural explanation of the huge
difference between the TeV scale and much higher scales like the quantum gravityscale. Last but not least it cannot describe cold dark matter (CDM), which constitutes 20% of the energy density of the universe. Thus we examine a warped
extra dimensional higgsless supersymmetric extension of the SM which allows EWSBvia boundary conditions, gives a natural explanation for the huge scalegive a short introduction to flat and warped extra dimensions and explain how toconstruct supersymmetric theories in extra dimensions. Afterwards I will outlinethe model, discuss the Feynman rules and at the end present possible characteristic signals of the model at the LHC.
The GSI time anomaly: facts and fiction
Dr. Carlo Giunti
INFN Torino
Sala Seminarios IFIC (Edf. Institutos Paterna)
Wednesday, December 3rd, 2008 at 12:00
Abstract
The GSI time anomaly is reviewed.
It is shown that the interpretations in terms of
neutrino mixing appeared in the literature are faulty.
With the help of an analogy with a double-slit
experiment, it is shown that the standard method of
calculation of the rate of an interaction process by
adding the rates of production of all the allowed
final states, regardless of a possible coherence among
them, is correct.
It is a consequence of causality.
It is shown that the GSI time anomaly may be due to
quantum beats due to the existence of two coherent
energy levels of the decaying ion with an extremely
small energy splitting (about 10^{-15} eV) and
relative probabilities having a ratio of about 1/99
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