Calendar

Mar
20
Mer
Thermal spectra in QFTs and their reconstructions (Saso Grozdanov, Edimburgh) @ Aula 501
Mar 20@2:00 pm–3:30 pm

Seminario Fisica Teorica

The holographic duality provides an explicit reduction of quantum field theory (QFT) calculations in the semiclassical large-N limit to sets of “gravitational” differential equations whose analysis can reveal all details of the spectra of thermal QFT correlators. In the first part of my talk, I will discuss the state of affairs in our understanding of thermal spectra from the point of view of hydrodynamics, kinetic theory as well as perturbative QFTs and, finally, holographic QFTs. Then, I will discuss how, in spectra with analytic properties that appear in holography, a complete reconstruction of the spectrum and of the corresponding correlator is possible from only the knowledge of an infinite, discrete set of pole-skipping points (a “0/0” in the associated correlation function) traversed by a single (hydrodynamic) mode. The main step that will enable a unique reconstruction will be a series expansion of the problem in an inverse number of spacetime dimensions, expanded around infinity. Conceptually, this reduces the computation of a QFT correlator spectrum to performing a set of purely algebraic manipulations.

Per connettersi a zoom:

https://infn-it.zoom.us/j/93341311520?pwd=RklTcFFVWjdtUzR5TUZKM3V1TjJiQT09

Mar
27
Mer
SMEFT vs HEFT for new physics searches at the LHC (Ilaria Brivio, Università di Bologna) @ Aula 501
Mar 27@2:00 pm–3:00 pm

Semina di Fenomenologia delle Particelle Elementari

Over a decade after the Higgs discovery, the hunt for physics beyond the Standard Model is incorporating more and more searches for small, non-resonant traces of new physics, that can be described by an Effective Field Theory (EFT).
The so-called Standard Model EFT (SMEFT) is now the standard framework used for these searches. The Higgs EFT (HEFT) is an alternative extension of the SM, which differs from SMEFT in the representation chosen for the scalar fields, a feature that results in a higher complexity and that, so far, has made HEFT less attractive for phenomenological studies.
Nevertheless, it is well-established that HEFT is more general than SMEFT, implying the existence of BSM scenarios which would be captured by the former but not by the latter. HEFT could also represent a useful candle to test the validity of the dimension-6 SMEFT approximation, an issue that has been raising significant concerns for LHC measurements.
After an introduction to the two frameworks, the first half of the talk will give an overview of the phenomenological characterization of HEFT and SMEFT. The second part will explore more formal aspects of the HEFT-SMEFT interplay, that build on a geometric description of the scalar sector.

Per connettersi a zoom:

https://infn-it.zoom.us/j/93341311520?pwd=RklTcFFVWjdtUzR5TUZKM3V1TjJiQT09

Apr
3
Mer
Precise QCD for associated top production ( Dr Simone Devoto, U. Ghent) @ Aula 501
Apr 3@2:00 pm–3:00 pm

Seminario di Fenomenologia delle Particelle Elementari

The production of a top quark pair in association with a heavy boson is a class of processes of high importance at LHC, both for precision Standard Model studies and new physics searches: top-pair production in association with a Higgs boson allows for a direct measurement of the top-quark Yukawa coupling, while the cross section of top-pair production in association with a W boson has been observed consistently higher than the Standard Model value by different experimental collaborations.
In this talk we present our recent computation of the NNLO QCD corrections to both these processes, with an emphasis on their phenomenological applications.

Per connettersi a zoom:

https://infn-it.zoom.us/j/93341311520?pwd=RklTcFFVWjdtUzR5TUZKM3V1TjJiQT09

Apr
10
Mer
TBA (Prof Matteo Viel (SISSA))
Apr 10@2:00 pm–3:00 pm

Physics Colloquia

Apr
17
Mer
TBA (Ilaria Archidiacono, UniMi)
Apr 17@2:00 pm–3:00 pm
Apr
24
Mer
TBA (Alessandro Giachino, IFIC)
Apr 24@2:00 pm–3:00 pm
Mag
8
Mer
Climate change: from science to action (Dr Elisabetta VIGNATI (Head of Unit and Deputy Director Joint Research Centre Directorate C, Energy, Mobility and Climate Clean Air and Climate Unit))
Mag 8@2:00 pm–3:00 pm

Physics Colloquia
Abstract:
Climate change is one of the most challenging global issues that humankind faces. The earth average surface temperature has risen more than 1 degree since the pre-industrial time and 2023 was the warmest year since 1880, year when modern measurement records began. The basic chemistry and physics of climate change have been understood for more than a century and effects already well documented. Science and research have significantly improved our understanding of the causes and our response options: human activities are estimated to have caused the temperature increase since pre-industrial time and global warming is projected to increase if substantial and sustained actions to reduce the human impact are not taken soon. Exploring the pivotal role of science in shaping international and European climate change policy, we delve into the dynamic interplay between scientific advancements and policy decisions as the scientific community’s influence is undeniable, driving evidence-based strategies that navigate the complex challenges of climate change.

Mag
15
Mer
TBA (Angelo Bassi, Trieste)
Mag 15@2:00 pm–3:00 pm
Mag
22
Mer
TBA (Pierpaolo Mastrolia, Padova)
Mag 22@2:00 pm–3:00 pm
Mag
29
Mer
TBA (Florian Beutler, Edinburgh)
Mag 29@2:00 pm–3:00 pm