A New Clue to Explain Existence

speaker: Alexander Lenz (Regensburg University)

Abstract: Recently headlines like "A New Clue to Explain Existence" went around the world to describe the result of the D0 collaboration at TeVatron presented on Friday 14th May. D0 measured semileptonic CP-Asymmetries in the two neutral B-meson systems and found a 3.2 sigma difference compared to the standard model (SM) expectation. We will review several different measurements that hint at deviations in the $B_s$ mixing system. In particular we will discuss the robustness of the corresponding SM predictions. Moreover we will also present some possible extensions of the SM that would give rise to large CP-violating effects in the $B_s$ system.

A Warped Model of Dark Matter

Friday June 25th, 14:30 - Seminar room

Speaker: Benedict von Harling (University of Melbourne)


We present a model of dark matter in a warped extra dimension in which various dark sector mass scales are naturally generated without supersymmetry. The dark matter, whose mass is in the TeV range, is charged under a dark abelian gauge group. The corresponding dark photon obtains a mass in the

Solving Steiner's 200 year old problem

Wednesday June 23rd, 14:00 - Coffe room

Speaker: Javi Virto



In an exciting submersion into the realm of convex sets in Hyperbolic space, I will show how an apparently disconnected problem can be solved: Steiner's characterization of Euclidean polytopes inscribed in the sphere. Useless but really FUN!




Non-gaussianity and large-scale structure surveys

Monday, June 7th, 14:30 - Seminar Room

Speaker: Licia Verde (ICC, Universitat de Barcelona)

Abstract: It has recently been shown that a popular type of primordial non-gaussianity affects drastically the clustering of extrema such as massive dark matter halos. This effect goes under the name of non-gaussian halo bias. Since galaxies, especially at high redshfits, are expected to trace such halos,

Unitarity applied to hidden sector processes

Friday May 28th, 14:30  -  Seminar room

Speaker: Antonio Delgado (Notre Dame, Indiana)


There has been some attention to the possibility that there exist hidden sectors coupled to the standard model with couplings suppressed by an energy scale such that it has not been possible to access them yet but the LHC will have

Reconciling leptogenesis with observable mu --> e gamma rates

Friday May 21st, 14:30 - Seminar room

Speaker: Thomas Hambye (Universite Libre de Bruxelle)

Abstract: Seesaw models which approximately conserve lepton number are known to allow for large Yukawa couplings and a low seesaw scale in agreement with neutrino mass constraints, and hence to lead to large lepton flavour violating rates that can be

Precision calculations for SUSY searches at the LHC

Friday May 14th, 14:30 - Seminar Room

Speaker: Michael Kraemer (Aachen University & IFAE)

Abstract:The search for supersymmetry is among the most exciting endeavors at the Tevatron and at the LHC. I will discuss precision calculations for the production of squarks and gluinos and how they can be used to set limits on the masses

Unification of expansions

Wednesday May 12th, 14:00 - Multifunctional room .

Speaker: David Greynat (will talk about his very last work)

Abstract: We show how it is possible to unify the resummation of threshold, low - and high- energy expansions in a controlled and systematic way. We will exemplify it for heavy-quark correlators.

Naturally non-standard Higgs boson decays

Friday May 7th, 14:30 - Seminar room

Speaker: Andreas Weiler (CERN, Geneva)

We are certain that the electro-weak symmetry is a gauge symmetry and that the longitudinal components of the heavy vector bosons are the Goldstone bosons of a spontaneous breaking. What we do not know is the mechanism behind the breaking. If an elementary scalar field like the Higgs in the Standard Model is responsible we are left sensitive to heavy scales in nature like the unification scale or the Planck scale. Since we do not believe

Friday April 30, 14:30 - IFAE seminar room

Speaker: Gregory Soyez (CERN, Geneva)

Jets, naively seen as collimated bunches of particles, are very useful tools at hadronic colliders. The major part of the talk will tackle a basic question: how can we define the jets from the particles in an event? In that perspective, I will review the definitions used over the last decades and show that

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