Seminars

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Theory Seminars

Pizza Seminars

Leptogenesis without violation of B-L

Friday December 10th, 14:30 hs - Seminar room

Speaker: Juan Racker  (Universitat de Barcelona)

 

Abstract:

Leptogenesis is a very attractive mechanism to explain the baryon asymmetry of the universe because it connects this mystery with the smallness of neutrino masses. After an introduction to leptogenesis we will motivate and describe a simple model for low energy leptogenesis that conserves B-L.

 

Searching for New Physics with Top Quark Decays

Friday December 3rd, 14:15hs - Seminar room

Speaker: Jernej F. Kamenik (Jozef Stefan Institute, Ljubljan)

 

Abstract:

We analyze possible new physics signals in the decays of the top quark within an effective field theory approach. In particular, we compute the branching ratios for the rare top quark decays t to c gamma and t to c Z mediated by effective flavor changing neutral couplings at the next-to-leading order in QCD including the effects due to operator mixing.

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The structure of 4D Conformal Field Theories

Friday November 26th, 14:30hs -  Seminar room

Speaker: Slava Rychkov  (ENS & UPMC, Paris)

Abstract:

I will review the status of the program, initiated a few years ago by the speaker and R. Rattazzi, of putting model-independent bounds on the structure of 4D CFTs by using OPE associativity and unitarity. I will also discuss applications to BSM phenomenology.

 

The emergence of Dirac Pyisics in Graphene

Tuesday, November 23rd, 14:00hs. - Coffee room

Speaker: Alessio Celi (UB)

Abstract:

After a very brief introduction to the genesis of the material and to the (apparent) clashing with the Mermin-Wagner theorem, I will show that many of the surprising experimental properties, like the relativistic dispersion relation of the quasi-electrons, can be easily explained by the tight-binding approx (Hubbard model).

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Neutrinoless double beta decay: Neutrino mass versus exotic contributions

Friday, November 19th, 14:30 - Seminar room

Speaker: Martin Hirsch (IFIC, Valencia)

Abstract:

Neutrinoless double beta decay is a very sensitive probe for physics beyond the standard model. Usually it is discussed only as a probe for the (Majorana) neutrino mass scale but, in principle, any model with lepton number violation can contribute to its amplitude.

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Discrete Symmetries and the Flavour Problem

Friday November 12th, 14.30hs - Seminar room

Speaker: Luca Merlo  (TUM, Munich)

Abstract:

The flavour puzzle is an open problem in the Standard Model and the use of new symmetries helps in explaining the fermion mass hierarchies and mixings as well as the (non-)observation of FCNC processes. I will review the main idea of the flavour model building with a particular attention to the discrete non-Abelian symmetries. Furthermore I will give few examples of possible strategies to test flavour models.

 

 

Holographic d-wave superconductors and spectral functions

Friday October 29th, 14:30hs -  Seminar room

Speaker: Francesco Benini  (Princeton University)


Abstract:

The properties of a superfluid phase transition with a d-wave order parameter in a strongly interacting field theory with gravity dual are considered. In the context of the AdS/CFT correspondence, this amounts to writing down an action for a charged, massive spin two field on a background, and I will

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Constraining new physics contributions to the width difference in the B_s system

Wednesday, October 27th, 14:30hs - Seminar room

Speaker: Christian Bauer  (LBL, Berkeley)

Abstract:

The recent measurement of the di-muon asymmetry by the D0 collaboration is in excess of the SM prediction by 3.2 sigma. In this talk I will discuss the implementation of this measurement, and show that the central value is in violation with the SM prediction for the off-diagonal term in the decay matrix

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Yang-Mills theory in 2+1 dim. (Schrödinger wave functional and Hamiltonian treatment by Karabali, Kim and Nair)"

Wednesday October 20th, 14:00hs - Multifunctional room

Speaker: Sebastian Krug

Abstract:

We review the treatment of 3 dimensional Yang-Mills theory in the fieldtheoretical Schrödinger picture done by Karabali, Kim and Nair, which gives an analytical continuum calculation of the vacuum wave functional, string tension, gluelump spectrum, etc. starting from first principles. For a review paper see hep-th/0309061.

 

 


 

Universal Extra Dimensions on (Projective) Sphere

Friday October 8th, 14:30hs - Seminar room

Speaker: Kin-ya Oda (Osaka University)

Abstract:

We propose a six dimensional Universal Extra Dimensions (UED) model compactified on a real projective plane $RP^2$, a two-sphere with its antipodal points being identified. We utilize the Randjbar-Daemi-Salam-Strathdee spontaneous sphere compactification with a monopole configuration of an extra

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