Introduction
This series of informal “particle physics and cosmology” meetings between theorists of the Institut de Physique Théorique and experimentalists of the Service de Physique de Particules/IRFU has started in June 2008, with the aim of fostering contacts and exchanges among people working on the two sides on topics of common interest.
About two or three meetings per year are organized, each one focussing on a selected theme in cosmology or particle physics. The format that we propose for each event usually has two parts. A first part with two short presentations (about 30’ + discussion), one by a theorist and one by an experimentalist, on an aspect of their current work. A second part organized in the form of “Questions and Answers”, during which a theorist and an experimentalist will try to answer, in a very informal and pedagogical way, a few questions previously selected among those suggested by the experimentalists and the theorists, respectively. Each meeting will last about half-a-day.
Rencontre n.12:
Date and time: Tuesday 10th June 2013, ,
Location: Salle Berthelot, SPP (Bat. 141)
Theme: Dark Matter
| 9:30 |
Ph. Brax(IPhT), P. Brun (SPP) |
welcome |
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| 9:30 - 9:50 |
Eric Armengaud (SPP)
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" Direct Detection: Brief History and New Search Windows " |
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| 9:50 - 10:10 |
Filippo Sala (IPhT)
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"A Minimal Model for Dark Matter and Vacuum Stability" |
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| 10:10-10:30 |
Marc Besancon (SPP) |
"LHC Searches" |
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| 10:30 - 10:50 |
Marco Cirelli (IPhT) |
"DM Searches: some Anomalies and many Constraints" |
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| 10:50 - 11:10 |
Emmanuel Moulin (SPP) |
" Indirect Searches" |
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| 11:10-11:30 |
Coffee Break |
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| 11:30 - 11:50 |
Marco Taoso (IPhT) |
" DM Searches with Radio Observations"
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| 11:50 - 12:10 |
Gaelle Giesen (IPhT) |
" Antiproton Constraints on Dark Matter Done Properly " |
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| 12:10-12:30 |
Esther Ferrer-Ribas (SPP) |
"Axion Searches"
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| 12:30-12:50 |
Philippe Brax (IPhT) |
"Axions after BICEP2" |
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Send us all your comments!
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Rencontre n.11:
Date and time: Thursday 26th September 2013, 14:00,
Location: Salle Galilee, Sap (Bat. 713)
Theme: Higgs Physics
| 14:00 |
Ph. Brax(IPhT), P. Brun (SPP) |
Bienvenue |
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| 14:00 - 14:30 |
Brando Bellazzini(IPhT)
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" Higgs Mechanism " |
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| 14:30 - 15:00 |
Boris Tuchming (SPP)
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" Collider Observables " |
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| 15:00-15.15 |
Jean-Yves Ollitrault (IPhT) |
"The Landau-Yang Theorem" |
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| 15:15 - 15:30 |
Fabrice Couderc (SPP) |
"How to Measure the Spin of the Higgs Particle? Scalar or Pseudo-scalar?" |
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| 15:30 - 15:45 |
Stephane Lavignac (IPhT) |
" The Hierarchy Problem" |
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| 15:45-16:00 |
Coffee Break |
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| 16:00 - 16:15 |
Philippe Brax (IPhT) |
" Higgs as Inflation, Dark Energy?"
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| 16:15 - 16:30 |
Roy Aleksan (SPP) |
" News from Future Colliders " |
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| 16:30-16:45 |
Brando Bellazzini (IPhT) |
"Higgs Lifetime and Vacuum Stability"
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| 16:45-17:00 |
Robi Peschanski (IPhT) |
"Diffractive Higgs" |
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Send us all your comments!
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Rencontre n.10:
Date and time: Thursday December 6th, 2012, 10h
Location: Salle A. Berthelot, SPP (Bat. 141)
Theme: Axions
| 10:00 |
E.Mazzucato (SPP), F. Vernizzi (IPhT) |
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| 10:00 - 10:30 |
Philippe Brax (IPhT)
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" Shining Light on Modifications of Gravity " |
[Slides] |
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Many modifications of gravity introduce new scalar degrees of freedom, and in such theories matter fields typically couple to an effective metric that depends on both the true metric of spacetime and on the scalar field and its derivatives. Scalar field contributions to the effective metric can be classified as conformal and disformal. Disformal terms introduce gradient couplings between scalar fields and the energy momentum tensor of other matter fields, and cannot be constrained by fifth force experiments because the effects of these terms are trivial around static non-relativistic sources. The use of high-precision, low-energy photon experiments to search for conformally coupled scalar fields, called axion-like particles, is well known. In this article we show that these experiments are also constraining for disformal scalar field theories, and are particularly important because of the difficulty of constraining these couplings with other laboratory experiments. |
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| 10:30 - 11:00 |
Esther Ferrer Ribas (SEDI)
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" Axion search with the CAST experiment " |
[Slides] |
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Axion searches have been exploiting a wide range of experimental techniques to attempt to detect this elusive particle since a few decades. The strategies for galactic, solar and laboratory axions will be briefly described focusing on the solar axion search with the CAST experiment. The results obtained from past data taking campaigns will be presented. CAST results represent the best experimental limit on the photon coupling to axions and other similar exotic particles in a wide range of axion masses up to 1.16 eV. Besides the limit enters the region favored by QCD axion models for the first time. Expected sensibilities for the extension of the CAST program up to 2014 will be presented. Long term options for a second generation helioscope will be evoked. |
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| 11:00 - 11:20 |
Coffee Break |
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| 11:20 - 11:45 |
Thibault Main de Boissière (SPP) |
" Axion searches with the EDELWEISS Ge bolometers " |
[Slides] |
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The EDELWEISS experiment aims at the direct detection of dark matter in the form of WIMPS using Ge bolometers at 20 mK in a dilution refrigerator installed at the Underground Laboratory of Modane.
In addition to this primary search, Ge bolometers are suitable detectors also for the detection of other particles, such as axions or ALPs.
We will present here preliminary results obtained in the framework of the EDELWEISS-II experiment on different axion-like particles characterized by different coupling mechanisms to ordinary matter, such as the Primakoff effect, the coherent Bragg diffraction and the axio-electric effect.
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| 11:45 - 12:15 |
Denis Wouters (SPP) |
" Effects of axion-like particles on the propagation of gamma-rays in the Universe "
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[Slides] |
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Due to their two-photon vertices, axion-like particles can convert into photons in magnetic field and vice-versa. Astrophysical environments can offer large magnetic field strength and/or long baselines, they are thus interesting laboratories for axion-like particle (ALP) searches. For instance ALPs are sometimes claimed to make the Universe more transparent to gamma-rays than conventionally expected, and to be responsible for observed effects. We propose to present a critical reassessment of this statement. By doing so, we will introduce a new observable for gamma-ray telescopes that can be used to put constraints in the ALP coupling/mass plane, based on the magnetic turbulence induced noise in the energy spectra of gamma-ray sources. |
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| 12:15 - 12:45 |
Jeremy Neveu (SPP) |
" Experimental constraints on light mass scalar field models in the SNLS and CMS experiments " |
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The Galileon model is a modified gravity theory that may provide an explanation for the accelerated expansion of the Universe. This model does not suffer from instabilities or ghost problems (normally associated with higher-order derivative theories), restores local General Relativity -- thanks to the Vainshtein screening effect -- and predicts late time acceleration of the expansion. We tested this model against precise measurements of the cosmological distances and the rate of growth of cosmic structure. In this talk, the methodology and the results will be presented and discussed.
The Branon model is a scalar field theory close to the Galileon model. The links with the latter will be discussed. Our plans to constrain its couplings to matter will be presented. |
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Send us all your comments!
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Rencontre n.9:
Date and time: Tuesday January 24th, 2012, 14h
Location: Salle C. Itzykson, IPhT (Bat. 774)
Theme: Neutrino physics
| 14:00 |
E.Mazzucato (SPP), F. Vernizzi (IPhT) |
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| 14:00 - 14:25 |
Enrico Bertuzzo (IPhT)
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" Flavor symmetries in the lepton sector " |
[Slides] |
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| 14:25 - 14:50 |
Sandrine Emery (SPP)
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" T2K" |
[Slides] |
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The T2K experiment studies the oscillations of nu_mu neutrinos produced at JPARC, in Tokai, Japan. The nu_mu beam is studied before oscillation by a near detector, and near the maximum of the oscillation by the Super-Kamiokande detector, located 295 km away from the neutrinos source.
The main goal is to measure the last unknown leptonic parameter theta13, through the analysis of nu_e appearance, but also to measure precisely the so-called atmospheric parameters through the analysis of nu_mu disappearance.
This talk will present the status of the T2K experiment, its concept and detection method, its recent results on theta13 and on the atmospheric parameters, as well as its future plans. |
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| 14:50 - 15:15 |
Vincent Durand (SPP)
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" Double Chooz " |
[Slides] |
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The Double Chooz experiment consist of two identical detectors, measuring the flux of electron anti-neutrinos coming from the nuclear reactors of Chooz in the French Ardennes. The goal is to measure the last unknown leptonic parameter theta13. One of the two detectors, the farthest, sensitive to theta13, is already taking data since April 2011. The other detector, the nearest, aiming at monitoring the reactor anti-neutrino flux, is under construction and is expected to be delivered in 2013.
This talk will present the experiment, its concept and detection method as well as its first results on theta13. |
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| 15:15 - 16:40 |
Francis Bernardeau (IPhT) |
" Neutrino mass from cosmological observations " |
[Slides] |
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| 15:40 - 16:00 |
Coffee Break |
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| 16:00 - 16:25 |
Guillaume Mention (SPP) |
" The reactor antineutrino anomaly and experimental status of anomalies beyond 3 flavors " |
[Slides] |
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In this talk, I will focus on the Reactor antineutrino anomaly and give also a review of the other anomalies leading to interpretations beyond the 3 active flavor models. The current experimental status of these anomalies will be presented as well as a view of the associated phenomenological studies.
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| 16:25 - 16:50 |
Stephane Lavignac (IPhT) |
" Sterile neutrinos" |
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| 16:50 - 17:15 |
Georges Vasseur (SPP) |
" Future neutrino experiments " |
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The next generation neutrino experiments, based on very big underground detectors, have the potential to study the mass hierarchy and CP violation in the neutrino sector, as well as neutrinos from astrophysical sources and the proton decay. Several design studies are underway all over the world, based on different beam configurations and different detector techniques. The various projects will be reviewed.
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Send us all your comments!
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