Third Rome Physics Encounters @LNF

Thursday 20 Feb 2020, 11:00 → 16:00 Europe/Rome

Aula Salvini

This informal meeting is the third of the Rome physics encounter series. It aims at bringing together young speakers working or collaborating with the research groups in the Rome area.

In the spirit of workshops and conferences at LNF, talks will be presented in a pedagogical way and plenty of time is scheduled to allow discussions among participants. The encounters will be synchronised with a selected LNF General Seminar, held in the afternoon at 2.30pm.

The lunch is offered to all registered participant at the LNF canteen.

Rome Physics Encounters: Young scientists series

1 Test of Effective Field Theory in the Higgs Boson H->ZZ*->4l decay channel with ATLAS detector at LHC

The enhancement of the statistics in the Run 2 up to 140 fb−1 has allowed more precise measurements of the Higgs boson cross section in the H->>ZZ*->4l decay channel, to probe possible Beyond Standard Model effects. In this talk the analysis strategy is presented together with some results, which has been used to put constraints on anomalous Higgs boson interactions with the Standard Model particles using the Pseudo Observable framework.

Speaker: Chiara Arcangeletti (L)

ThirdPhysicsEncounter_Arcangeletti.pdf

2 Dark Sector searches at Belle II: first results and future prospects

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8 \times 10^{35}$ cm$^{-2}$s$^{-1}$ and
the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. During 2018, the machine has completed a commissioning run, recording a data sample of about 0.5 fb$^{-1}$. Main operations started in
March 2019 with the complete Belle II detector: an integrated luminosity of 6.5 fb$^{-1}$ has been collected so far.
These early data sets, with specifically designed low multiplicity triggers, offer already the possibility to search for a large variety of dark sector particles in the GeV mass range, complementary to LHC and to dedicated low energy experiments. The talk will review the status of the dark sector searches at Belle II, with a focus on the discovery potential of the early data, and show the first results.

Speaker: Giacomo De Pietro (INFN and Univ. Roma Tre)

Presentazione.pdf

3 Introductory lecture

Speaker: Prof. Stefano Forte (U. Milano) (MI)

13:15 Lunch

General LNF Seminar

4 Machine learning an unknown physical law: the structure of the proton

Machine learning techniques are increasingly used for recognizing pattern and devising optimal strategies: situations in which the machine is taught (or teaches itself) to learn a known correct answer, or the best use of known rules. In particle physics, machine learning has been used now for several years in order to determine an underlying physical law which is known to exist, but which is unknown. Furthermore, because elementary particles are quantum objects, this law is stochastic in nature: the machine has to learn a probability distribution, rather than a unique answer. I will discuss some classic results, used among others in the discovery of the Higgs boson, as well as recent developments, which raise the fundamental question of how to decide whether an answer is correct.

Speaker: Prof. Stefano Forte (U. Milano)