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Theory Seminars

Pizza Seminars

Effective field theory approach to top-quark physics at NLO accuracy

June 6 2014, 2:30pm -  Seminar room

Speaker: Cen Zhang (U C Louvain)

Abstract: Top quark processes potentially suffer from a large uncertainty at leading order in QCD. To search for new physics in top quark processes, it is desirable to have a model-independent approach at the NLO accuracy.

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SEMINAR: The Dilaton and its many Faces

June 3 2014, 12:00pm -  Seminar room

Seaker: Javi Serra (Cornell U)

Abstract: Even if theoretically discovered long ago, the dilaton, the pseudo-Goldstone boson of spontaneous breaking of scale invariance, is still subject of active investigations. These not only concern theoretical developments, such as new realizations based on the AdS/CFT correspondence, but also phenomenological applications. In this talk I will first review the effective theory for the spontaneous breaking of scaling symmetry, next I will present a warped extra-dimensional model with all the expected features, and finally I will discuss two of the potential manifestations of the dilaton in Nature: in cosmological phase transitions and in the context of a inflationary universe.

SEMINAR: High scale mixing unification with Dirac neutrinos

May 30 2014, 2:30pm - Seminar room

Speaker: Gauhar Abbas  (IFIC, Valencia)

Abstract:We investigate 'High Scale mixing unification' hypothesis in the context of Dirac neutrinos. This hypothesis assumes the unification of the mixing angles and phases of the CKM and PMNS matrices at some high scale. This could be a possible signature of the quark-lepton unification. After taking quarks mixing angles and Dirac phase equal to that of PMNS matrix, we run down renormalization-group equations of the neutrinos to the low scale. We observe that all the low-energy oscillation parameters are recovered.

SEMINAR: The MSSM and color- and charge- breaking minima

Thursday May 29 2014. 12:00pm - Seminar room

Speaker: Jose Eliel Camargo Molina  (Universität Würzburg)

Abstract: For models with extended Higgs sectors, minimizing the one-loop effective potential and calculating tunneling times between physical and non- physical minima can provide a competitive phenomenological constraint. In this talk we will discuss the method for finding all the minima of the potential and tunneling times implemented in the software package Vevacious. As an example we will take a look at charge- and color- breaking minima in the MSSM both at zero and non-zero temperature. We will see that when requiring compatibility with other phenomenological constraints, vacuum stability presents an even more challenging scenario for this model.

SEMINAR: Superfluids, type-II NG bosons and AdS/CFT"

May 25 2014, 12:00pm - Seminar room

Speaker: Amadeo Jimenez Alba (IFT UAM)

Abstract: How many NG bosons should you expect after spontaneous symmetry breaking? How do they behave? Are these questions modified at strong coupling? The Goldstone theorem just states that the SSB of a global and continuous symmetry implies the existence of a massless mode that we call NG boson.

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SEMINAR: On the validity of effective field theory for dark matter searches at LHC

Friday May 16 2014, 2:30pm - Seminar room

Speaker: Enrico Morgante (U de Geneve)


Effective operators are a powerful tool for Dark Matter searches, because of their simplicity and because they provide a framework in which Direct Detection, Indirect Detection and collider experiments can put model independent constraints on the same space of parameters.

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SEMINAR: Heavy Vector Triplets: Bridging Theory and Data

May 9 2014, 2:30pm - Seminar room

Speaker: Andrea Thamm (EPFL Lausanne)

Abstract: I will discuss a model-independent strategy to study narrow resonances applied to a heavy vector triplet of the Standard Model group for illustration. The method is based on a simplified phenomenological Lagrangian which reproduces a large class of explicit models.

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SEMINAR: BSM Primary effects

May 8 2014, 2:30pm - Seminar room

Speaker: Sandeepan Gupta

Abstract: While the predictions of the SM Lagrangian have by now all been tested, the experimental verification of the predictions of its dimension 6 extension are only begining, with the arrival of Higgs data. We first identify the BSM primary effects, the set of physical quantities, that give us the best way to constrain new physics.

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SEMINAR: Split SUSY Radiates Flavor

Friday April 25th 2014, 2:30pm -  Seminar room

Speaker: Daniel Stolarski (CERN)

Abstract: The discovery of a Higgs with mass around 125 GeV is in tension with natural supersymmetry (SUSY).

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SEMINAR: A sterile neutrino at MiniBooNE, MicroBooNE and IceCube

Friday April 28 2014, 12:00pm

Speakar: Manel Masip (Universidad de Granada)

Abstract:We argue that a sterile neutrino of mass around 50 MeV slightly mixed with the muon flavor may be the origin of the MiniBooNE anomaly, and we study its implications at MicroBooNE (that starts taking data this year).

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