Calendar of Physics Talks Vienna

Heavy Quark Mass Determinations with Sum Rules and Jets
Speaker:Bahman Dehnadi (Univ. Wien)
Abstract:In the first part of this talk I present our final results of charm and bottom quark mass determinations using the relativistic QCD sum rules at four loops based on low moments (ratios of moments) of vector and pseudoscalar current correlators. The analysis of the perturbative uncertainties is based on independent variations of the renormalization scales for the mass and coupling constant, supplemented with a convergent test of perturbative expansions to discard the series that potentially suffer from large logarithmic corrections. In the second part I will present preliminary results for a complete description of the entire thrust distribution for boosted jets with heavy quarks in e-e+ collisions at NNLL.
Date: Tue, 03.03.2015
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang

Is there new physics in b to s decays?
Speaker:Aoife Bharucha (Centre de Physique Theorique of Marseille)
Abstract:I will summarise the current status of exclusive b to s transitions, in particular the numerous anomalies seen recently at the LHC. I will discuss whether it is possible to explain these anomalies in terms of new physics or QCD. The situation certainly motivates improvements in the theoretical descriptions of these decays in the standard model. This includes the form factors, which describe the hadronic transition matrix elements. In previous light cone sum rules calculations, correlations between the seven form factors for B to vector meson (B to V) transitions were not provided. This information is important in assessing which observables are least sensitive to hadronic effects. I will present new results for the form factors for B to V transitions, where correlations and the equation of motion are taken into account, and show the impact of these form factors on the uncertainties.
Date: Thu, 05.03.2015
Time: 13:30
Duration: 60 min
Location:Library, HEPHY, Nikolsdorfer Gasse 18, 1050 Wien

An invitation to String(Gravity)/gauge theory dualities
Speaker:Radoslav Rashkov (TU Vienna)
Abstract:im Rahmen des Literaturseminars für Gravitationsphysik: The understanding of the strong coupling phenomena at qualitative and quantitative level is a challenging task. The best way to attack this problem is at present is the duality between two (or more) theories. The purpose of this lecture is to introduce the basic contemporary concepts of string (gravity)/gauge theory duality and discuss some of their features. The main focus will be on the so-called AdS/CFT correspondence. I'll briefly discuss simple examples of the so-called "brane engineering" of some gauge theories. The "magic" appearance of W-symmetries will be also very briefly discussed.
Date: Thu, 05.03.2015
Time: 14:00
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel

Last Chance to be Wrong: What New Physics Will the LHC Discover?
Speaker:Cliff Burgess (Perimeter Institute & McMaster University)
Abstract:Naturalness arguments have shaped our expectations for what the LHC would see, and seem to be in disarray given the results of the 8 TeV run. Besides not seeing the expected new particles, lack of progress on the cosmological constant problem appears to undermine the whole picture. Is it time to abandon these arguments? This talk describes my own (cautiously optimistic) view about what the current situation says about them, and about what we should expect to see at the LHC once it restarts at full energy this year.
Date: Fri, 06.03.2015
Time: 10:30
Duration: 60 min
Location:Seminar Room, Wohllebengasse 12-14 (Academy building), ground floor
Contact:Josef Pradler