Zakład Cząstek i Oddziaływań Fundamentalnych

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 21 marca (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Spin Structure of the Nucleon: From CERN SPS to EIC”

(powtórka konwersatorium z NCBJ)

Referuje: dr hab. Marcin Stolarski (NCBJ)

I will present over 40 years of involvement by Warsaw groups in studying the (spin) structure of the nucleon through CERN SPS muon experiments—including EMC, NMC, SMC, and COMPASS. While these experiments have led to many intriguing physics insights, precise answers to key questions remain elusive due to the kinematic limitations of fixed-target setups. This is set to change with the upcoming Electron-Ion Collider (EIC), the world’s first polarized electron-proton collider, which promises unprecedented access to the nucleon’s spin structure.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 14 marca (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Silicon Photomultipliers in Gamma and Neutron Radiation Detection – Principles and Applications”

Referuje: dr hab. inż. Martyna Grodzicka-Kobyłka (NCBJ)

Gamma-ray spectrometry using scintillation detectors is one of the most important measurement techniques employed in various fields of nuclear physics and related research. This method finds applications in fundamental nuclear physics studies, environmental monitoring, nuclear medicine, and modern border security systems.

Scintillation detectors consist of a scintillating material, which absorbs gamma quanta and subsequently emits light, and a photodetector responsible for registering this signal. The most commonly used photodetectors include PIN diodes, avalanche photodiodes (APDs), vacuum photomultiplier tubes (PMTs), and modern silicon photomultipliers (SiPMs).

This presentation will cover the operating principles of silicon photomultipliers, their advantages and limitations, as well as their potential applications in detecting light emitted by scintillators in gamma-ray spectrometry and neutron detection. Special emphasis will be placed on their use in physics, medicine, and security systems.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 7 marca (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„The scalar sector – story so far – from the ATLAS perspective”

Referuje: dr hab. Paweł Bruckman de Renstrom (IFJ PAN)

The long-awaited discovery of the Higgs boson has fundamentally changed the paradigm of experimental particle physics. The BEH mechanism turned from an attractive hypothesis into a physical reality. The detailed study of the properties of the only known fundamental scalar, as well as the direct search for an extended scalar sector, became the main focus of the LHC physics program. Based on ATLAS results, the talk will briefly review the current experimental status of the 125 GeV Higgs boson and focus on the searches for BSM phenomena in the scalar sector.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 28 lutego (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Understanding Quark and Neutrino Mixing: Theory and Experiments”

Referuje: dr Oleksandr Tomalak

The behavior of fundamental particles, such as quarks and neutrinos, is key to understanding the Standard Model of particle physics. Their mixing patterns are described by two mathematical

objects: the Cabibbo-Kobayashi-Maskawa (CKM) matrix for quarks and the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix for neutrinos. In this talk, I will explain how recent advances in theory and experiments are helping to improve the precision of these matrices.

For quarks, I will discuss how precise measurements of the neutron lifetime allow us to determine the largest CKM matrix element, Vud. I will present a modern theoretical framework that accounts for subtle effects, like radiative corrections, in low-energy processes with nucleons. These corrections are essential for achieving high precision in extracting Vud.

For neutrinos, future experiments such as Hyper-Kamiokande in Japan and LBNF/DUNE in the USA aim to answer fundamental questions, such as whether neutrinos preserve charge-parity (CP) violation and the ordering of their masses. These experiments depend on accurate predictions of how neutrinos interact with matter. I will review recent theoretical progress on radiative corrections, the structure of hadrons, and neutrino-nucleus interactions, and discuss their role in determining the elements of the PMNS matrix.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 24 stycznia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Highlights on BSM searches at CMS”

Referuje: dr Małgorzata Kazana (NCBJ)

The searches for the Beyond the Standard Model physics with the CMS experiment at LHC will be presented

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 17 stycznia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Linear Collider Vision for the update of the European Particle Physics Strategy”

Referuje: prof. dr hab. Aleksander Filip Żarnecki  (IFD UW)

LCVision idea was born in spring 2024. The main goal was to make a strong case for Linear Colliders in general, based on physics arguments. With mature designs for the first stage and attractive upgrade options Linear Collider Facility (LCF) is being proposed as an alternative option for the future project at CERN. Last week Linear Collider Vision Community Event took place at CERN with about 250 registered participants. Selected results from the meeting will be presented.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 10 stycznia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„High Energy Neutrinos: Recent results from IceCube”

Referuje: dr Joanna Kiryluk  (Stony Brook University)

IceCube neutrino observatory is 1km3 detector located at the South Pole in Antarctica. It’s been continuously taking data, since its completion in 2010. 

In 2012, IceCube detected first PeV neutrino events, the highest energy neutrinos ever observed, and measured an unexpectedly large astrophysical diffuse neutrino flux. 

Since then, we characterized this flux utilizing different detection selections with:  all-flavor neutrino events starting in the detector,  muon neutrino induced tracks, and  cascades events, dominated by electron and tau neutrino flavors. The diffuse flux was found to be well described by a single power law with a spectral index of 2.5, softer than expected.

Its origin remains largely unknown. In 2017, an IceCube neutrino alert from a direction of TXS 0506+056 triggered a multi-wavelength campaign of followup observations, and identified TXS 0506+056 as a cosmic rays accelerator and a common source of high energy neutrinos and gamma rays: a breakthrough in multi-messenger astronomy.

Since then, IceCube found evidence that astrophysical neutrinos are correlated with NG1068, PKS1424+240 and TXS0506+056 active galaxies.

In this talk we will review IceCube results on astrophysical neutrino diffuse flux and sources, as well as plans for the future.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 6 grudnia (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Latest Results and Status of the LUX-ZEPLIN Dark Matter Experiment”

Referuje: Leah Wolf  (Royal Holloway University of London)

The LUX-ZEPLIN (LZ) experiment is a dark matter direct detection experiment located 4,850 feet underground at the Sanford Underground Research Facility (SURF) in South Dakota. The detector is a dual-phase Time Projection Chamber (TPC) that whose target consists of 7 tonnes liquid xenon target aimed at detecting dark matter interactions, primarily from the highly-motivated candidate – Weakly Interacting Massive Particles (WIMPs), as well as some other phenomena beyond the standard model. LZ continues to constrain parameter-space for WIMP-like dark matter as it acquires more data towards its goal of 1,000 days of live time. This talk will present LZ’s new results from the combined 2022-2024 exposure and the status of the detector.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 29 listopada (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„ECFA Workshops on e+e- Higgs/Electroweak/Top Factories”

Referuje: prof. dr hab. Aleksander Filip Żarnecki (IFD UW)

Third ECFA Workshop on physics and detectors for future e+e- Higgs/Electroweak/Top Factories took place in October in Paris.

This was the last of the workshop series which should conclude with the ECFA report on the physics at future Higgs factories. I will report on ECFA study in general, selected results presented at the last workshop and on the status of the final report being prepared as an input for the European Strategy for Particle Physics update.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 22 listopada (piątek) o godzinie 11:30, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„iThemba Laboratory for Accelerator-Based Sciences (LABS)  „

Referuje: dr Rudolph Nchodu (deputy director of the iThemba LABS, Cape Town)

iThemba LABS is the hub to a vibrant research, human capital development, and collaboration network for nuclear science that includes the South African universities, research institutions and international counterparts.

The iThemba LABS K=200 separated sector cyclotron (SSC), one of the accelerator complex comprising 3 accelerators, has been used for nuclear physics research, particle (neutron and proton) therapy, and radioisotope production since its commissioning in 1986. In the first 30 years of the SSC’s operation, the beam time has been equally divided between the three programs, which severely limited the competitiveness of the nuclear physics research program. iThemba LABS acquired a new 70 MeV cyclotron that will be dedicated to isotope production, which will free up the SSC for research.

Nuclear Physics research at iThemba LABS serves as the backbone of research at iThemba LABS and the research programs in the next 5 to 10 years will be focused on niche areas where the laboratory’s research program will complement the research carried out at cognate laboratories around the world. The Long Range Plan initiated in 2017 aiming for increasing the nuclear physics research capacity as well as the technical R&D and the required human capacity development, will be presented as well as the status of its implementation. The prominent global position that iThemba LABS Facility enjoys and its critical role in coordinating the continental contribution to collaborative initiatives with international nuclear Physics institutions will  be discussed.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak

prof. dr hab. Aleksander Filip Żarnecki