Author: Bartłomiej Brudnowski

Dnia 27 marca (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Fermat primes  in flavour mixing and mass hierarchies”

Referuje: prof. dr hab. Jacek Ciborowski (IFD UW)

A Balmer-like empirical  analysis of quark and neutrino mixing angles and of the charged-lepton mass hierarchy suggests a remarkable interplay between number theory and geometry, involving  Fermat primes  5 and 17 (or equivalently the golden ratio in place of the former). The resulting pattern fixes two of the three a priori unknown parameters entering the (presently frequently exploited) Froggatt–Nielsen description of flavour hierarchies.  This may provide useful guidance for further phenomenological studies (quark and neutrino masses)  and possibly for the search for a more fundamental theory of flavour.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

Dnia 20 marca (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Neutrino Flux Prediction and Uncertainties in T2K”

Referuje: dr Haradhan Adhikary (IFD UW)

Neutrino flux prediction and its associated uncertainties are of central importance for precision oscillation measurements in long-baseline experiments. In this talk, I will present the current neutrino flux prediction for the T2K experiment, obtained using hadron production measurements from NA61/SHINE at the CERN SPS on both thin and T2K replica targets.

The methods employed in T2K to predict and constrain the neutrino flux will be described, including the use of external hadron production data and in-situ constraints from near-detector measurements. Finally, future plans within T2K to further improve flux prediction and uncertainty treatment will be outlined, together with a discussion of the broader community needs required to reduce flux-related uncertainties in support of next-generation precision neutrino oscillation experiments.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

Dnia 27 lutego (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Information-Geometric Approaches in High-Energy Physics”

Referuje: dr Alibordi Muhammad (IFD UW)

In this talk, I will explore how concepts from information geometry can provide new insights into complex phenomena in high-energy physics. I will present two illustrative examples: (1) a product manifold approach in machine learning that enhances classification performance for Vector Boson Fusion decays, and (2) a reformulation of CP violation from an information-geometric perspective. Finally, I will discuss potential applications of these techniques in the upcoming Phase-2 upgrade of the CMS experiment.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

Dnia 23 stycznia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Pomiar anomalnych momentów magnetycznych leptonów”

Referuje: dr hab. Artur Kalinowski, prof. UW (IFD UW)

Przypomnę istotę anomalnego momentu magnetycznego punktowych, naładowanych, cząstek. Następnie przedstawię eksperymenty w których jest wykonywany pomiar tej wielkości dla leptonów ze wszystkich trzech generacji.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

Dnia 16 stycznia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Inclusive charm photoproduction in ultraperipheral collisions at the LHC”

Referuje: prof. Anna Staśto (Penn State University)

Ultraperipheral collisions (UPCs) of nuclei at high energies offer unique opportunity to explore the nuclear structure in a clean environment. UPCs occur when two nuclei scatter at impact parameters that exceed the sum of nuclear radii. The UPCs lead to large photonuclear cross sections.  In UPC processes involving jets or heavy quarks, large scale allows for perturbative description of the process, and thus such processes can serve as good probes of the nuclear structure. We present the calculation of the  inclusive D0 production cross section in UPC PbPb collisions at the LHC using the Generalized photon-nucleus FONLL framework. In this approach the heavy quark production is computed using the FONLL framework developed previously by Cacciari-Frixione-Nason for ep collisions,  and includes additional electromagnetic corrections to describe the photoproduction cross section in UPC heavy ion collisions. The calculations are validated against the D* photoproduction cross section from HERA. The predictions for D0 cross section as a function of rapidity and transverse momentum of the D0 meson are presented and compared to the preliminary results from UPC collisions measured by CMS. The sensitivity of the results is studied, when different choices of parton distribution functions and fragmentation functions are made, as well as a function of variation in renormalization and factorization scale dependence.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

Dnia 9 stycznia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Raport from the EPS-HEP conference”

Referują: dr Małgorzata Kazana (NCBJ)

dr Katarzyna Kowalik  (NCBJ)

The European Physical Society Conference on High Energy Physics (EPS-HEP) is one of the major international conferences organized every second year. The latest edition was hosted in Marseille, France in the summer of 2025. The conference highlighted the latest breakthroughs and developments across a broad range of topics, including high energy and particle physics, astroparticle physics, neutrino physics, and related disciplines.

During the seminar we will review two topics: LHC physics (M.Kazana) and neutrino physics (K.Kowalik)

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 12 grudnia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Far-forward physics at the LHC”

Referuje: dr hab. Sebastian Trojanowski (NCBJ)

The launch of the LHC Run 3 data-taking period marked the advent of the collider neutrino physics program and far-forward BSM studies via the dedicated FASER and SND@LHC experiments. The neutrino program aims to bridge gaps in precision neutrino measurements. It also serves as a novel window to test hadronic interactions at high energies and large pseudorapidities, which generate forward neutrinos at the LHC.

The new physics program is dedicated to probing BSM scenarios connected to theoretical thermal dark matter targets. In this talk, we will summarize ongoing measurements, outline future plans, and highlight selected specific applications of this experimental program.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki