Calendar

Dic
9
Mer
Seminario di Fisica Teorica Dr. Giulio Gambuti (Oxford University) @ on-line
Dic 9@11:00 am–12:00 pm

Non-Fierz-Pauli Massive Gravity

Modifying gravity at large distances by means of a massive graviton may explain the observed acceleration of the Universe without Dark Energy. The standard paradigm for Massive Gravity is the Fierz-Pauli theory, which, nonetheless, displays well known flaws in its massless limit. The most serious one is represented by the vDVZ discontinuity, which consists in a disagreement between the massless limit of the Fierz-Pauli theory and General Relativity. A field-theoretical treatment of linearized Massive Gravity leads to an alternative theory describing the five degrees of freedom of the graviton, with a good massless limit, without vDVZ discontinuity, and depending on one mass parameter only, in agreement with the Fierz-Pauli theory.

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).

Dic
16
Mer
Seminario di Fenomenologia Dr. Humberto Reyes (Università di Genova) @ on-line
Dic 16@11:00 am–12:00 pm

Constraining the Minimal Dirac Gaugino Model

Most SUSY searches at the LHC are optimised for the MSSM, where gauginos are Majorana particles. By introducing Dirac gauginos, we obtain an enriched phenomenology, from which considerable differences in LHC signatures are expected. Concretely, in the Minimal Dirac Gaugino Model (MDGSSM) we have an electroweakino sector extended by two extra neutralino and one extra chargino eigenstates. Furthermore, a small mass splitting between the bino- like and between wino- like states can be naturally induced leading to the presence of Long Live Particles (LLPs). Here we discuss current limits on the gluinos and squarks and on the electroweakino sector of the MDGSSM, derived from reinterpretion LHC results and by considering constraints from dark matter searches. Finally, we discuss the presence of scenarios with LLPs whose predominant signature has not been covered in LHC searches.

Mar
3
Mer
Think harder, think deeper: new ideas in jet physics @ online
Mar 3@11:00 am–12:00 pm

Seminario di Fenomenologia – Dr. Simone Marzani (Dip.to di Fisica Universita’ di Genova e INFN Sezione di Genova)

In this talk some recent developments in the context of jet physics and their structure are reviewed. In particular, new substructure variables that aim to probe colour flow in particle events are introduced. These variables find a natural application in the context of tagging a boosted Higgs boson. In the second part of the talk, the use of machine-learning algorithms in the context of jet physics is reviewed and the first attempts to achieve a systematic first-principle understanding of their performance is 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).

Mar
10
Mer
The relevance of Irrelevant Perturbations @ online
Mar 10@11:00 am–12:00 pm

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).

Mar
17
Mer
Jet and grooming algorithms at the future Electron-Ion Collider @ online
Mar 17@11:00 am–12:00 pm

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).

Mar
24
Mer
Neyman-Pearson inspired machine learning models for new physics searches @ online
Mar 24@11:00 am–12:00 pm

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).

Mar
31
Mer
Entanglement dynamics in 1+1 dimensional quantum system: the example of the Ising spin chain @ on-line
Mar 31@11:00 am–12:00 pm

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).

Apr
1
Gio
CDS @ on-line
Apr 1@2:00 pm–3:00 pm

Consiglio di Sezione

Il Consiglio verterà sul seguente Ordine del Giorno:
1) Comunicazioni del Direttore
2) Varie ed eventuali

Apr
7
Mer
New ideas for a precision measurement of the W boson mass @ online
Apr 7@11:00 am–12:00 pm

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).

Apr
14
Mer
The puzzling behavior of pentaquarks and tetraquarks @ on-line
Apr 14@11:00 am–12:00 pm

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).