Author: Wojciech Orpel

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 25 października (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Dependence of the radio emission of air showers on the cosmic ray primary particle composition”

Referuje: dr Washington Rodrigues De Carvalho jr.  (IFD,UW)

Abstract: We will start with brief introductions to Cosmic Rays (CR),extensive air showers and their radio emission. We will explore the origins

of the dependence of the air shower development on the primary CR composition and how it affects the radio emission. We will then proceed to

describe in more detail our newest work regarding a strong composition dependence on the measured radio signal amplitudes at ground level. This

simple, yet historically overlooked dependence can be explained in terms of two competing scalings of the measured electric field that depend on the

position of the shower maximum (Xmax) in the atmosphere. This dependence can be used to directly infer the CR primary composition, even on a non-standard

event-by-event basis.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 18 października (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Overview of the spin programme of COMPASS”

Referuje: prof. dr hab. Barbara Badełek (IFD,UW)

The purpose of the COMPASS facility is a study of hadron structure and spectroscopy with high energy hadron and (polarised) muon beams.

In the spin programme polarised proton and deuteron targets were used in inclusive and semi-inclusive deep-inelastic reactions as well as in the Drell-Yan process. Deeply virtual Compton scattering and hard exclusive meson muoproduction were studied using an unpolarised proton target.

A panorama of COMPASS results on 1D and 3D nucleon structure, based on the invited talk delivered at the „Diffraction and Low-x 2024” conference in Trabia (Italy), will be presented.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

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

„Report from the NEUTRINO24: XXXI International Conference on Neutrino Physics and Astrophysics”

Referuje: dr Magdalena Posiadała-Zezula (IFD,UW)

An overview of the  most interesting results presented at the NEUTRINO24 conference will be presented.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 4 października (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Report from the ICHEP-2024:42nd International Conference on High Energy Physics”

Referuje: dr hab. Grzegorz Grzelak (IFD,UW)

A subjective overview of most interesting results brought to the ICHEP-2024 conference will be presented.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 14 czerwca (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Latest Results from Tau Neutrino Appearance Measurements at Super-Kamiokande”

Referuje: Maitrayee Mandal (NCBJ)

The Super-Kamiokande (SK) experiment, a water Cherenkov detector located in Japan. Since 1996, SK has been collecting data on muon and electron neutrinos being produced by cosmic rays in the atmosphere. Tau neutrinos are expected to appear in this flux of atmospheric neutrinos due to neutrino oscillations. In this seminar, I will discuss the measurements of tau neutrino appearance covering an exposure of 484 kton-years at SK, with which, we exclude the hypothesis of no tau neutrino appearance at 4.8 sigma.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 7 czerwca (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„The Muon Shot – Combining Energy with Precision”

Referuje: Dr. Juergen Reuter (DESY, Hamburg)

  Muon colliders have been recently regained a lot of interest, pointed out in the US Strategy process in 2023 (P5 report). They combine both the amazing cleanliness and precision of lepton collisions with the energy range of 10 TeV „parton level” collisions. In this talk I will briefly review the muon collider proposal and then focus on selected physics topics like sensitivity to anomalous muon-Higgs couplings, the search for new heavy Z’ gauge bosons, searches for heavy neutral leptons and the delicacies of precision calculations and simulations at high-energy muon colliders

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 24 maja (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„The Standard Model electroweak sector after Run 2 – selective review of CMS results”

Referuje: dr hab. Michał Szleper, prof. NCBJ  (NCBJ)

  Run 2 of the Large Hadron Collider has produced a lot of results from the electroweak sector of the Standard Model. This includes measurements that shed light on the interactions between vector bosons – triple and quartic gauge couplings – based on a variety of physics processes: from inclusive diboson production to single boson in vector boson fusion mode, vector boson scattering and triboson production. In this seminar we will review the importance and role of triple and quartic gauge couplings in the search for physics beyond the Standard Model and how we measure them. I will give an overview of CMS results obtained from Run 2 data and discuss what should and can be improved in Run 3 and the HL-LHC.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 17 maja (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Recent results from COMPASS on the GPD program”

Referuje: prof. dr hab. Andrzej Sandacz  (Dep. of Fundamental Research, NCBJ)

Generalised Parton Distrbutions (GPDs) provide 3-D description of the nucleon structure. They encompass 1-D description by PDFs or by form factors. The two most appealing goals of the GPD studies are: the „nucleon tomography” and the role of the orbital momenta of quarks and gluons in  explaining „nucleon spin crisis”. 

After an introduction to the GPDs, the upgrade of the experimental setup, which was  essential for the COMPASS GPD program, will be briefly described. The discussion of results for investigated three channels of  exclusive pseudo-scalar or vector mesons production will follow.They consitute an important input for modelling GPDs. In particular, in the context of the phenomenological Goloskokov-Kroll model they provide a clear evidence for the parton helicity-flip (chiral-odd) GPDs.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 26 kwietnia (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„The future of multidimensional phase space in collider physics”

Referuje: dr Alibordi Muhammad (IFD UW)

The Large Hadron Collider is consistently increasing the luminosity and the energy. This will help the experimentalists to search for new physics beyond the standard model. Simultaneously this high amount of data requires a much more sophisticated data analysis approach. It requires a deeper  understanding of the problem both in statistical and computational sense than ever before. This talk will make a surface level review of some of these aspects.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 19 kwietnia (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Transverse-spin asymmetries in COMPASS Drell-Yan data „

Referuje: mgr Małgorzata Niemiec (IFD UW)

After nearly 60 years of extensive experimental and theoretical studies, several aspects of the nucleon structure are still poorly known. While main  efforts focuse on its collinear structure, measurements of transverse parton momenta are scarce and their analysis complicated.

They involve measuring cross-section asymmetries in reactions like semi-inclusive deep inelastic scattering or Drell-Yan processes.

In 2015 and 2018 the COMPASS Collaboration at CERN performed measurements of the Drell-Yan process π−p → μ+μ−X at 190 GeV/c pion beam and transversely polarised NH3 target. This presentation covers a description of the measurement of Transverse Spin Asymmetries in the Drell-Yan process, and in particular of a novel approach, in contrast to the conventional one, where the asymmetries are weighted by powers of a transverse momentum of the dimuon system with respect to the beam.

This presentation is an extended version of a talk given on behalf of the COMPASS Collaboration  at the International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2024, in Grenoble (France), 8-14 April, 2024.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Aleksander Filip Żarnecki