Calendar

Apr
28
Gio
Quark-Gluon Plasma at the LHC: studying the extreme state of QCD with heavy-ion collisions @ on-line
Apr 28@11:00 am–12:00 pm

Colloquium INFN/DIFI – Andrea Dainese (INFN Padova)

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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mag
5
Gio
Collinear functions for QCD resummations @ A601 e online
Mag 5@11:00 am–12:00 pm

Seminario di Fisica Teorica – Prasanna Dhani (INFN Genova)
Singular factors originating from the QCD factorisation of scattering amplitudes in soft and collinear limits play a prominent role in both organising and computing high-order perturbative contributions to hard-scattering cross sections. In this talk, I will report on recent work done in collaboration with Stefano Catani. We start from the factorisation structure of scattering amplitudes in the collinear limit, and we introduce collinear functions that have a process-independent structure. These collinear functions, which are defined at the fully-differential level, can then be integrated over the appropriate observable-dependent phase space to compute logarithmically-enhanced contributions to the corresponding observable. For transverse-momentum dependent observables, we show how the collinear functions can be defined without introducing what is known as rapidity divergences in the literature. We present the results of explicit computations of the collinear functions up to next-to-next-to-leading order.
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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mag
12
Gio
MIxed QCD-electroweak corrections to Drell-Yan production @ Aula 601 e online
Mag 12@11:00 am–12:00 pm

Seminario di Fenomenologia – Dr. Raoul Röntsch (Universitá di Milano)

Drell-Yan production is one of the keystone processes at hadron colliders, relevant for a multitude of analyses from precision measurements of the Standard Model parameters to searches for New Physics. As such, it is important to obtain highly precise theoretical predictions to compare with data. I will discuss the computation of mixed QCD-EW corrections to onshell vector boson production and highlight their impact on the measurement of the mass of the W boson, where the target precision is around 0.1 permille. I will then discuss the calculation of mixed QCD-EW corrections to massless dilepton production, and present results focusing on intermediate to high invariant mass regions.
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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mag
26
Gio
New avenues of QFT in curved spacetime @ Aula 603 e online
Mag 26@2:30 pm–3:30 pm

Seminario di Fisica teorica INFN/DIFI – Vincenzo Vitagliano (Universitá di Genova)

Spontaneous symmetry breaking is a transversal concept in modern physics, being pivotal for our understanding of mass generation in particle physics, topological defects formation in cosmology, and the appearance of condensed phases of matter. I will discuss some recent results about the way symmetry breaking occurs for systems embedded in a curved background, when curvature acts as an effective mass that, depending on the sign, enhances or suppresses the mechanism responsible for phase transitions. I will then move to a general discussion about the ground state of nonlinear field theories, commenting on the substantial changes in the structure of the quantum vacuum occurring even for the simplest choice of boundary conditions. Not only this leads to nontrivial modulation of the Casimir force as a function of external conditions, but it also regulates the behaviour at small vs large scales.
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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Ott
6
Gio
Gravitational multipoles beyond, Bogdan Ganchev (Saclay University) @ 602 e online
Ott 6@11:00 am–12:00 pm

(Seminario di Fisica Teorica)
In this talk I consider gravitational mulipoles in 4D theories beyond pure Einstein gravity. For the Kerr black hole, the mutlipole moments are uniquely determined by the first mass and current multipoles, but this is not necessarily true beyond classical gravity, in string theory for example. We will look at the effects of higher-derivative corrections to the Kerr mutlipoles from an EFT point of view and discuss their viability as probes of corrections to the Kerr black hole. We will also discuss whether the richer structure of multipole moments in string theory, as compared to that of the Kerr black hole, can be used to pose constraints on corrections to General Relativity coming from string theory.

Per connettersi a zoom

Topic: Theory and Pheno seminars

https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Ott
13
Gio
Analytic bootstrap of mixed correlators in the O(n) CFT (Francesco Bertucci, Università di Pisa @ Aula 602 e online
Ott 13@11:00 am–12:00 pm

Conformal field theories have two main characteristics. First, they are important in the study of critical phenomena. Second, their rigid structure makes them suitable to test theoretical challenges and obtain general results. In this talk, I will describe some of their general features and see how physical data can be extracted using powerful theoretical tools. Specifically, I will focus on the study of the O(n) CFT in less than four dimensions, trying to systematize the study of four-point correlators. I will explain how to use the Lorentzian inversion formula to extract physical data in perturbation theory and discuss some interesting features and technical details which arise in the process.

Per connettersi a zoom

Topic: Theory and Pheno seminars

https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271