Calendar

Gen
1
Gio
Positivity Constraints on Lorentz-breaking EFTs (Paolo Criminelli, ICTP) @ Aula 500 e online
Gen 1 1970@1:00 am–Feb 7 2106@7:28 am

Seminario di Fisica Teorica-

The coefficients of the operators of an effective field theory (EFT) are constrained to satisfy certain inequalities, under the (mild) assumption that the UV completion satisfies general requirements of causality and unitarity. We begin the extension of these ideas to theories where the Lorentz symmetry is spontaneously broken, as it happens in cosmology and condensed matter physics. Constraints are derived using dispersive arguments for the 2-point function of conserved currents and of the stress-energy tensor.

Per connettersi a zoom:

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

Nov
29
Lun
CDS @ on-line
Nov 29@2:00 pm–3:00 pm

Consiglio di Sezione

Dic
2
Gio
The ATLAS beauty @ A603 e online
Dic 2@11:00 am–12:00 pm

Seminario di Fenomenologia INFN/DIFI – Prof . Umberto De Sanctis (Roma Tor Vergata)

The ATLAS experiment is one of the four experiments collecting data from proton-proton collision produced by the Large Hadron Collider (LHC) at CERN in Geneva. From 2010 to 2018, ATLAS collected more than 150 fb-1 of data in the Run 1 and Run 2 campaigns. In this talk I will summarise the main results obtained during this period by the ATLAS experiment in the flavour physics domain highlighting the strategies to analyse the huge amount of data available and the physics channels where ATLAS can produce competitive results in comparison with other experiments.
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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271
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Dic
23
Gio
CDS @ on-line
Dic 23@2:00 pm–3:00 pm

Consiglio di Sezione

Mar
3
Gio
Measurement of the W boson mass at LHCb @ on-line
Mar 3@11:00 am–12:00 pm

Seminario di Fenomenologia INFN/DIFI – Mika Vesterinen (Warwick University)

Global fits to precision electroweak data are sensitive to physics beyond the Standard Model but this sensitivity is currently limited by the precision with which the W mass has been directly measured. The most precise measurements of the W mass have been at hadron collider experiments using the kinematic distributions in leptonic W decays. I present the first measurement of the W mass with the LHCb experiment, which is a single-arm small-angle spectrometer experiment at the LHC. I will start with an introduction to the standard model and the precision electroweak observables before describing the challenges in measuring the W mass and the solutions used in LHCb’s measurement. This measurement is based on a subset of the existing LHCb data and I will present an outlook for a more precise measurement with the full dataset, and future combinations with the other LHC experiments.

Per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mar
10
Gio
Astrometric techniques for the calibration of the ASTRI Cherenkov telescope @ on-line e Aula 601
Mar 10@11:00 am–12:00 pm

Seminario pheno/astro INFN/DIFI – Dr. Simone Iovenitti (INAF)

ASTRI is an Italian project for the study of Very High-Energy astrophysical phenomena up to 300 TeV and beyond. After the success of the first prototype instrument located in Italy, ASTRI-Horn, the project is entering the realization phase of the MiniArray: 9 identical Cherenkov telescopes working in stereoscopic mode to be installed in Tenerife, Canary Islands. The ASTRI telescopes present a dual-mirror Schwarzschild-Couder optical configuration (never adopted before in gamma-ray astronomy) and a Cherenkov camera based on fast SiPM sensors, able to image the nanosecond atmospheric flashes produced by energetic cosmic photons. Unfortunately, such devices are almost blind to the steady flux of stars in the field of view and consequently the calibration of their pointing represents a technological challenge, also because the compactness of the structure prevents from installing auxiliary monitoring camera sharing the same optical system of the telescope. However, exploiting the so-called Variance method (a statistical algorithm implemented in the ASTRI electronics) the star signal can be successfully recovered by ASTRI (down to ~ 7 mag), offering the potentiality to image the night sky background and meet the demanding pointing requirement (few arc-sec) despite the coarse pixel size of the camera (11 arc-min). To this end, dedicated astrometry techniques have been developed on purpose. Their validation with data from ASTRI-Horn revealed the presence of unexpected systematic errors, demonstrating the importance of such analysis. At present, similar routines for the astrometric calibration of the pointing are being developed to be implemented in the MiniArray, enhancing the accuracy of the whole system.
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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mar
14
Lun
Increasing the precision of the QCD coupling around the tau mass scale @ Aula 601 e online
Mar 14@2:00 pm–3:00 pm

Seminario di Fenomenologia – Dr. Diogo Boito (Universidade de Sao Paulo/University of Vienna)

The theoretical precision of many crucial observables in the
Standard Model is nowadays limited by our knowledge of QCD parameters.
Determining the strong coupling and quark masses with smaller uncertainties is
therefore a fundamental task in order to match the reduced errors
that are expected from present and future experiments.
Extracting the QCD parameters is not a straightforward task, since
they are not physical observables: theory input is as important as experimental data. I will
discuss recent developments in the precise determination of the strong coupling
around the tau mass scale, which represents one of the most stringent
tests of asymptotic freedom. I will discuss a viable solution to a
long-standing problem related to the renormalization group improvement
of the perturbative series, the interplay between perturbative and
non-perturbative contributions, and the role of recent experimental
data.
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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mar
17
Gio
Assessments strategies that promote engaged learning in STEM @ on-line
Mar 17@3:00 pm–4:00 pm

Seminario di didattica – Claudia De Grandi (Utah University)

Claudia de Grandi ha studiato a Milano, e si è formata durante il suo PhD e post-doc, all’università di Boston e poi a Yale, come fisica teorica della materia condensata. Dal 2018, de Grandi è Assistant Professor (Lecturer) of Educational Practice all’Università dello Utah, US. Da diversi anni i suoi interessi principali di ricerca riguardano soprattutto la didattica della fisica. Il seminario è rivolto a tutti i docenti dei nostri corsi di laurea, e sarà una importante occasione di formazione: spero partecipiate numerosi!

Abstract:
Educational research shows correlation between students’ learning gains and formative assessment. Active learning techniques in STEM have been proven to produce better learning outcomes. I will argue for the need to shift from a traditional instructor-centered approach to an interactive student-centered course structure which offers continuous opportunities for formative feedback. I will provide concrete examples of assessment approaches in STEM that build collaboration among students and instructors, increase student self-efficacy, and hence help students achieve content mastery.
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Zoom link:
https://utah.zoom.us/j/94051338743
Passcode: 17marzo

Mar
24
Gio
The critical $O(N)$ CFT @ on-line e Aula 601
Mar 24@11:00 am–12:00 pm

Seminario teorico INFN/DIFI – Johan Henriksson (Università di Pisa)

Fifty years ago Wilson and Fisher published their renowned paper on the epsilon-expansion of the critical $O(N)$ model. Nowadays we may think of the critical $O(N)$ model as a two-parameter family of conformal field theories, labeled by $N$ and spacetime dimension $d$. Advances in both diagrammatic technology and CFT methods have led to a constant supply of new results for the $O(N)$ CFT, both perturbatively and non-perturbatively. In this talk, I will give an introduction to the $O(N)$ CFT from the perspective of conformal field theory, with a focus on the often-implicit assumption of spectrum continuity, which is the conjectural assumption that all conformal data, such as critical exponents and operator scaling dimensions, depend continuously on the parameters $N$ and $d$.

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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Apr
7
Gio
Quantum Information and AdS/CFT @ on-line
Apr 7@11:00 am–12:00 pm

Seminario teorico INFN/DIFI – René Meyer (Julius-Mazimilian Universitat Würzburg)

In recent years, the study of quantum information measures has been fruitful in the understanding of quantum many body systems as well as black holes. The connection to gravity is given by the AdS/CFT correspondence, which maps strongly correlated quantum systems to weakly coupled gravity in one additional dimension, and vice-versa. In this talk I will give a pedagogical introduction to the AdS/CFT correspondence, its usefulness in studying strongly interacting quantum matter, as well as its relation to quantum information theory, and here in particular to quantum computational complexity. Finally, I will present several recent research results of our research group in this direction, and conclude with possible future directions.

———————————————–
Per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271