Calendar

Ott
28
Ven
Exploring strongly interacting dark matter (Suchita Kulkarni, Graz Univ.) @ Aula 501 e online
Ott 28@2:00 pm–3:00 pm

Seminario di Fenomenologia
Understanding the laws governing the dark matter dynamics in the
Universe is undoubtedly one of the pressing questions in
astro-particle physics. While investigations of elementary particles
as potential dark matter candidates have been at the heart of
investigations, an equally interesting possibility arises if dark
matter is instead a composite particle. I will take an overview of
dark matter theories arising from extensions of Standard Model with
new non-Abelian sectors. Analysis of such dark sector dynamics
benefits from connections to lattice calculations. I will sketch the
avenues of progress and highlight some of the open questions in this
direction. I will also take two example realisations of such strongly
interacting dark matter theories and exemplify associated
phenomenology.

Per connettersi a zoom:
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Nov
3
Gio
The landscape and the swampland: quantum gravity constraints on 4d effective field theories (Nicolo’ Risso, Univ. Padova) @ Aula 602 e online
Nov 3@11:00 am–12:00 pm

Seminario di Fisica Teorica

It has became clear that the landscape of possible effective field theories arising from string compactifications is vast. On the other hand, in the last 20 years it has been shown that it represents only a small part of the possible QFTs coupled to gravity one may imagine. The reason is, as shown by the seminal work by Vafa and Ooguri, that most QFTs when coupled to gravity develop subtle inconsistencies and for that they can’t appear as effective field theories of a consistent theory of quantum gravity. The space of such theories as been called the swampland, in opposition to the landscape, and the conditions they fail to satisfy swampland conjectures. In this talk, I will give first a review of the swampland program and the main swampland conjectures, explaining the arguments that justify them, and then show recent results obtained with Martucci and Weigand about constraints on N=1 d=4 theories coming from the existence of peculiar extended objects in their spectrum we called EFT strings. In particular, we will be able to derive upper bounds on the possible rank of the gauge group of the 4 dimensional theory and check the validity of this claim in a large number of explicit string theory constructions.

Per connettersi a zoom
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Nov
10
Gio
Machine learning for hadron spectroscopy (Cesar Fernandez Ramirez, UNAM) @ Aula 602 e online
Nov 10@11:00 am–12:00 pm

Seminario di Fenomenologia

Recently, JPAC collaboration has developed and benchmarked a systematic approach to use Deep Neural Networks as a model-independent tool to analyze and interpret experimental data and to determine the nature of an exotic hadron. Specifically, we studied the line shape of the Pc(4312) signal reported by the LHCb collaboration. This novel method presents great potential and can be applied to other near-threshold resonance candidates.

Per connettersi a zoom
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Nov
17
Gio
From detector hits to final state particles with machine learning (Nilotpal Kakati, Weizmann Institute of Science, Israel) @ Aula 602 e online
Nov 17@11:00 am–12:00 pm

Seminario di Fenomenologia

Particle Flow (PFlow), the task of reconstructing final state particles from the detector readout, is at the heart of Collider physics. The task is quite challenging due to the complex nature of the detector data, which is heterogeneous (tracks, cells, cluster of energies), sparse, and usually originates from a non-uniform detector geometry. The recent advancements in the felid of Machine learning (ML) have suggested new possibilities beyond the scope of traditional parametric approaches to solving this complex task. In the talk, I will show models that use a set of detector hits as inputs and predict a set of reconstructed particles. I will also discuss a few novel approaches with graph-based architectures, and understand how we can combine ML with physical motivations to obtain State-of-the-art performance. I will also discuss how these models are well-suited to tackle generative problems.

Per connettersi a zoom:
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Nov
24
Gio
Challenges in cosmic ray physics: galactic sources, antimatter, dark matter (Prof. Fiorenza Donato, Torino U.) @ Aula 601 e online
Nov 24@2:00 pm–3:00 pm

Seminario di Fenomenologia
The unprecedented precision of data cosmic rays and gamma rays challenges
our understanding of the origin and of the behaviour of cosmic rays in the
Galaxy. We will discuss possible interpretations of the nuclear component,
with emphasis payed to the antimatter channels, where a possible
contribution from dark matter annihilation has been argued.
We will critically assess the leptonic component within a multi-messenger
approach, and in connection with the most recent observations in
gamma-rays.

Per connettersi a zoom:
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Dic
1
Gio
Higher-dimensional Quantum Spin and Valley Hall Effects in Synthetic Matter (Giandomenico Palumbo, Dublin Institute for Advanced Studies) @ Aula 602 e online
Dic 1@11:00 am–12:00 pm

Seminario di Fisica Teorica

Higher-dimensional topological phases play a key role in understanding the lower-dimensional topological phases and the related topological responses through a dimensional reduction procedure. In this talk, I present a 4+1-D Dirac-type Hamiltonian protected by CP-symmetry, whose 3D boundary supports an odd number of Dirac cones. This system supports (4+1)-D quantum spin and valley Hall effects. A specific perturbation splits each bulk massive Dirac cone into two valleys separated in energy-momentum space with opposite second Chern numbers, in which the 3D boundary modes become a nodal sphere or a Weyl semi-metallic phase. By introducing the electromagnetic (EM) and pseudo-EM fields, exotic topological responses of our system are revealed, which are found to be described by the (4+1)-D mixed Chern-Simons theories in the low-energy regime. Notably, several topological phase transitions occur when the bulk gap closes by giving rise to exotic double-nodal-line/nodal-hyper-torus gapless phases. Finally, I show how to probe experimentally these topological effects in cold atoms.

Per connettersi a zoom
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Dic
2
Ven
Joint Analysis Center progress in hadron spectroscopy (Prof. Adam Szczepaniak, Indiana University) @ Aula 605
Dic 2@11:00 am–12:00 pm

Seminario generale

In this seminar, Prof. A.Szcepaniak will present the current activity of JLab Joint Physics Analysis Center (JPAC) concerning the analysis of hadronic resonances in data set s from GLUE, CLAS12, LHCb, BESIII, and COMPASS. Plans and opportunities for the foreseen upgrade in the energy of the CEBAF accelerator, 20+ GeV, will also be discussed.

Dic
16
Ven
Scattering Amplitudes: Mathematical Methods and Novel Results (Giulio Gambuti, Oxford U.) @ Aula 501 e online
Dic 16@2:00 pm–3:00 pm

Seminario di Fisica Teorica

Scattering amplitudes provide a window on the mathematical structure of Quantum Field Theory and serve as a bridge between theoretical predictions and experimental data. Because of this, their computation is of interest to many different research areas. Although much progress has been made in the last few decades, it remains very hard to compute scattering amplitudes at higher orders in perturbation theory. I will describe modern mathematical methods for the analytic computation of amplitudes in a general QFT. As a direct example and application, I will present new three-loop results which, for the first time, allowed a direct extraction of the quadrupole radiation contribution to the infrared structure of QCD. I will conclude with a description of the high-energy (Regge) limit and the first computation of the three-loop gluon Regge trajectory.

Per connettersi a zoom
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271