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Calendar of Physics Talks Vienna
| Longitudinal structure of relativistic heavy-ion collisions from the (3+1)D dilute Glasma (Vienna Theory Lunch Seminar) |
| Speaker: | Markus Leuthner (TU Wien) |
| Abstract: |
The (3+1)D dilute Glasma is a novel framework for the computation of rapidity-dependent early-time observables in relativistic heavy-ion collisions. First, I discuss the QCD phase diagram and the extremely successful class of experiments called heavy-ion collisions performed at RHIC and LHC. I then show how the Glasma, the first stage after a collision of relativistic nuclei, emerges in the Color Glass Condensate effective theory for high energy QCD. The dynamics of the Glasma are governed by the classical Yang-Mills equations, which I will solve for longitudinally extended sources, employing the dilute approximation. I obtain an analytic expression for the energy-momentum tensor of the Glasma as a function of rapidity. [... see more on https://lunch-seminar.univie.ac.at ] |
| Date: | Tue, 14.05.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | TU Wien: Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11 |
| Contact: | Florian Lindenbauer |
| Factorization of non-global LHC observables Part 1: Resummation of super-leading logarithms |
| Speaker: | Matthias Neubert (University of Mainz) |
| Abstract: | We present a systematic formalism based on a factorization theorem in Soft-Collinear Effective Theory (SCET) to describe non-global observables at hadron colliders, such as gap-between-jets cross sections. The cross sections are factorized into convolutions of hard functions, capturing the dependence on the partonic center-of-mass energy $\sqrt{\hat s}$, and low-energy matrix elements, which are sensitive to the low scale $Q_0\ll\sqrt{\hat s}$ characteristic of the veto imposed on energetic emissions into the gap region between the jets. The scale evolution of both objects is governed by a renormalization-group equation, whose form we derive. With the help of this equation, we develop an EFT-based approach to the resummation of so-called âÂÂnon-global logarithms'', including the âÂÂsuper-leading logarithmsâ discovered by Forshaw et al. in 2006, which only appear in hadron-collider processes. |
| Date: | Tue, 14.05.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
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