Seminario di Fisica Teorica – Roberto Tateo (Università di Torino and INFN, Sezione di Torino)
Two-dimensional field theories deformed by Zamolodchikov’s TTbar
operator have recently attracted the attention of theoretical physicists
due to the many important links with integrability and string theory.
In this talk, I will describe various classical and quantum aspects of
this irrelevant perturbation, in particular the deformation of soliton
models.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice.
Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Seminario di Fenomenologia – Yiannis Makris (INFN, Sezione di Pavia)
With the future Electron-Ion Collider data estimated to arrive in a decade, the need for theoretical and phenomenological tools to understand deep inelastic scattering (DIS) events has never been more urgent. In this seminar I will discuss early steps towards this direction. Specifically, I will focus on the:
i) Centauro jet algorithm, a jet algorithm for DIS,
ii) the adaptation to DIS of the modified MassDrop Tagger grooming
algorithm (mMDT).
Our adaptation relies on the geometrical separation of initial and final state radiation in the Breit frame, where I will establish the definitions of the proposed observables. The novel grooming procedure, although similar to mMDT, employs the Centauro measure used in the corresponding jet algorithm tailored to the needs of DIS. The groomed invariant mass (GIM) will also be discussed.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice.
Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Seminario di Fenomenologia – Dr. Marco Letizia (Universita’ di Genova)
In this seminar I will present some recent ideas in machine learning for model independent anomaly detection in high energy physics data. In particular I will discuss models at the interception of machine learning and hypothesis testing, specifically leveraging the Neyman-Pearson lemma. I will conclude showing some preliminary experimental results on toy and simulated data.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice.
Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Seminario di Fisica Teorica – Dr. Jacopo Viti (INFN Firenze e IIP-UFRN Natal, Brasile)
Entanglement evolution represents nowadays an important theoretical diagnostic to detect whether a quantum system out-of-equilibrium can eventually relax toward a stationary state at late times.
In this talk, I will introduce the main ideas and motivations beyond the study of entanglement dynamics in many-body systems by analyzing a paradigmatic model of statistical physics: the Ising spin chain.
In particular, I will review classic results such as the linear growth of the entanglement entropies and its link with thermalization. Eventually, I will discuss some new developments that were recently obtained in collaboration with O. Castro Alvaredo, Mate Lencses, and Istvan M. Szecseny.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice. Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Consiglio di Sezione
Il Consiglio verterà sul seguente Ordine del Giorno:
1) Comunicazioni del Direttore
2) Varie ed eventuali
Seminario di Fenomenologia – Dr Lorenzo Bianchini (INFN Sezione di Pisa)
The mass of the W boson offers a unique opportunity for testing the electroweak sector to high precision. At present, the Standard Model of strong and electroweak interactions yields an indirect determination of the W boson mass which is more precise than the direct measurement. The gap between theory and experiment, made even more intriguing by a slight tension between the two, motivates the continuation of the experimental program. Unfortunately, at the LHC, this program has hit the wall of systematic uncertainty, mostly related to our imperfect description of hadron collisions. ASYMOW is an ERC-funded project which proposes a new approach, agnostic with respect to the microscopic picture of W boson production, to circumvent the limiting systematic uncertainties. The intrinsic model-independence of the method, joined with its robustness towards the harsh environmental conditions of proton-proton collisions, will allow for a full exploitation of the unprecedented data set collected by the CMS experiment at the LHC. By leveraging this power, a big step ahead on the experimental side seems possible. This project comes with great experimental, theoretical, and computational challenges. Its successful completion would set a milestone in precision at hadron colliders, with far-reaching implications.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice.
Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Colloquium – Dr.ssa Elena Santopinto
Quarks that combine in much more complex ways than scientists expected can have repercussions in many fields, not only in particle physics, but in astronomy, from neutron stars to dark matter. The recent observation by LHCb of a meson made of four charm quarks (T_cccc) and of three pentaquark states (P_c^+) has consecrated the subject of exotics as a hot topic. New experiments at LHC and Belle plan to shed light on this unexpected behavior
and try to understand the strong force at long distance. In this talk, some of the main experimental findings and theoretical predictions given before the experimental discoveries, regarding fully charm tetraquarks and pentaquarks, will be presented and discussed.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice. Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Seminario di Fenomenologia – Dr. Alessandro Guida (Genova Univ. and DESY Hamburg)
High energy physics experiments are performed at the Large Hadron Collider at CERN colliding bunches of protons at energies up to 13 TeV. The ATLAS experiment, with its multipurpose detector, studies the products of these colli- sions and compares the experimental measurements with the predictions of the Standard Model. This talk presents the study of the process Z/γ∗ → μμ at low invariant mass of the di-muon pair, in the region between 7 GeV and 60 GeV, below the Z boson resonance mass peak (mZ = 91.2 GeV). The single and double differential cross sections of the process are measured in 13 TeV proton-proton collisions at the LHC, using the ATLAS detector. The measurement explores an extreme region of the phase space and is sensitive to resummation results in the theoretical prediction. The analysis exploits the good resolution of the ATLAS detector in reconstructing low momentum muons. The main difficulties come instead from the high background component that enters in the event selection, the triggering of events and the modelling of some key physical quantities.The main features of the analysis, the studies done to overcome the main challenges, as well as the first results and comparison to theory predictions are presented in the talk.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice. Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Seminario Colloquium – Dr. Marco Incagli (INFN Pisa)
The recently published result by the Fermilab Muon g-2 experiment on the muon anomaly a_mu, based on the first dataset collected in Spring 2018, confirms the discrepancy of the observed value from the currently Standard Model prediction, reaching 4.2 standard deviations. The data already collected, and currently under analysis, will half the current uncertainty, while the full dataset, including the run programmed to be concluded in June 2022, will reduce the error by a factor of 4, thus potentially allow for a discovery of new physics beyond the Standard Model.
After a historical introduction, the experiment will be reviewed, discussing the critical issues of the first set of data and how they have been addressed in view of the high statistics Runs.
Recent theoretical developments will be also presented.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice. Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).
Seminario di Fisica Teorica – Dr. Daniel Brattan (Genova Univ.)
I will review our recent works concerning a large class of systems with spontaneous, pseudo-spontaneous and explicitly broken translation invariance in the presence of an external magnetic field. In particular I will show how the Ward identities constrain the transport coefficients of hydrodynamics. We will discuss a holographic realisation of these analytic results and place them in the wider context of the quasi-hydrodynamic programme.
Per partecipare: gruppo Teams Università di Genova numero 1npbr0h (se si possiede un account Teams Unige, si può accedere con il codice. Se invece si possiede solo un account Teams INFN, scrivere a simone.marzani@ge.infn.it per essere aggiunti come ospiti).