Faculty of Physics University of Warsaw > Events > Seminars > High Energy Physics Seminar

High Energy Physics Seminar

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room B2.38, Pasteura 5 at 10:15

Maitrayee Mandal (NCBJ)

Latest Results from Tau Neutrino Appearance Measurements at Super-Kamiokande

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.

room B2.38, Pasteura 5 at 10:15

Dr Juergen Reuter (DESY, Hamburg)

The Muon Shot - Combining Energy with Precision

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

room B2.38, Pasteura 5 at 10:15

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

The Standard Model electroweak sector after Run 2 - selective review of CMS results

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.

room B2.38, Pasteura 5 at 10:15

prof. dr hab. Andrzej Sandacz (NCBJ)

Recent results from COMPASS on the GPD program

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.

room B2.38, Pasteura 5 at 10:15

dr Alibordi Muhammad (IFD UW)

The future of multidimensional phase space in collider physics

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.

room B2.38, Pasteura 5 at 10:15

mgr Małgorzata Niemiec (IFD UW)

Transverse-spin asymmetries in COMPASS Drell-Yan data

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.

room B2.38, Pasteura 5 at 10:15

dr Tomas Nosek (NCBJ)

T2K+NOvA Joint Neutrino Oscillation Analysis

The T2K and NOvA experiments are the two currently active long-baseLine (LBL)experiments to measure the phenomenon of neutrino oscillations. This talk presents ajoint T2K+NOvA neutrino oscillation analysis within the standard three active neutrinoflavors paradigm, which includes each experiment’s fully detailed detector simulationsand takes advantage of the complementary oscillation baselines of 295 km and810 km and neutrino energies around 0.6 GeV and 2 GeV for T2K and NOvA, respectively.The T2K and NOvA collaborations have worked together on a joint analysisof the two experiments’ data, hoping to use the differing physics sensitivities to paintthe clearest picture of neutrino oscillations from LBL experiments. Within a unifiedBayesian inference, the results from the first T2K+NOvA joint neutrino oscillationmeasurement will be discussed.

room B2.38, Pasteura 5 at 10:15

prof. dr hab. Mariusz P. Dąbrowski (NCBJ)

Construction of the research high temperature gas-cooled reactor HTGR-POLA (POLish Atomic) in Świerk

High-temperature nuclear reactors produce heat at the temperature range (from over 500 ⁰C to even1000 ⁰C) which is hardly achievable by any light water reactor (approx. 300 ⁰C). In view of thatthey are ideal for decarbonization of the Polish chemical and petrochemical industry which requiresthe high temperature steam. NCBJ has been carrying out preparatory work in various areas (legal,social, organizational, technical) for the construction of this type of reactors in Poland for nearly adecade. Now the NCBJ experts plan to build a research-demo reactor at Świerk in order to gainexperience towards industrial implementation of this technology. Due to the fund from the Ministryof Science and Higher Education (agreement 1/HTGR/2021/14), the elaboration of the so-calledbasic design of such a reactor is being carried on. This happens in cooperation with the JapanAtomic Energy Agency, which possesses similar, though not updated to current trends inpolygeneration (production electricity, heat, hydrogen etc.), research device - HTTR.The reactor traditionally carrying feminine name “POLA” will have a power of 30 MW thermal andwill operate continuously using the energy produced for NCBJ's own purposes (electricityproduction, municipal heat) and for an industrial test installations using high-temperature steam at560 ⁰C. The aim of the seminar will be to present the context, assumptions, status of current workon the reactor design and the prospects for its rapid construction.

room B2.38, Pasteura 5 at 10:15

Małgorzata Kazana (NCBJ)

Exotic searches with the CMS detector at the CERN LHC

LHC scientists extend searches for new particles using advanced techniques and exploring exotic signatures. The report on results obtained by the CMS experiment with LHC Run-2 (mainly) and Run-3 data will be given.

room B2.38, Pasteura 5 at 10:15

dr hab. Kazuki Sakurai, prof. UW (IFT UW)

Quantum Information at Colliders

Quantities and concepts in quantum information theory (QIT), such as entropy and Bell-nonlocality, play an important role in the development of quantum technologies as well as in deepening our understanding of quantum field theory and gravity. Recently, an effort to observe QIT quantities at the LHC and future colliders has been started and attracted attention. In this talk, after briefly reviewing the recent progress on this topic, I will present my recent works based on 2211.10513 and 2310.01477. The first part is a study of observing the spin-entanglement of two tau-leptons produced from the Higgs decay. The second part concerns entanglement among three particles in 3-body particle decays.

room B2.38, Pasteura 5 at 10:15

dr hab. Paweł Małecki (IFJ PAN)

Pacific Ocean Neutrino Experiment (P-ONE)

The neutrino astronomy is a new but already well-established branch of physics under a rapid development in the recent years and fitting well into the concept of multi-messenger astronomy. The studies of astrophysical very-high-energy neutrinos are carried out by large-scale next-generation neutrino telescopes, located in different regions of the world and including the IceCube, Baikal-GVD and KM3NeT detectors currently in operation. The Pacific Ocean Neutrino Experiment(P-ONE) is currently under construction in the Pacific Ocean, 600 km west from Vancouver at depth of 2.6 km and will cover over 3 cubic-km of active volume, being sensitive to neutrinos with energies between 100 TeV and 10 PeV. Its first regular measurement line will be deployed by the end of 2025, followed by subsequent lines shortly after. This talk reviews the design and working principles of the P-ONE detector, existing results and perspectives.

room B2.38, Pasteura 5 at 10:15

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

Uczenie maszynowe w fizyce

Machine learning in physics

W czasie seminarium przypomnę podstawowe pojęcia z dziedziny uczenia maszynowego, następnie przytoczę losowe przykłady jego zastosowania w różnych działach fizyki.

During the seminar I will recall basic concepts of machine learning, then I willbring random examples of its application in various fields of physics.

room B2.38, Pasteura 5 at 10:15

Karol Lang (University of Texas at Austin)

Image-guided FLASH Proton Therapy

Image-guidance and dosimetry of the in-vivo proton range verification is one of the most underinvested aspects of radiation cancer treatment. The scarcity of sensitive instruments and treatment protocols for precision monitoring of effects of beam radiation leaves much room for improvement. This is despite that such measurements may dramatically enhance the treatment accuracy and lower the post-exposure toxicity, improving the entire outcome of cancer therapy.In this talk, we will discuss designing and building of an in-beam time-of-flight positron-emission-tomography (PET) scanner to be tested in pre-clinical studies at Proton Therapy Center of MD Anderson Cancer Center in Houston. We will also discuss selected results of recent experiments with FLASH proton beam irradiations of phantoms and other related ideas towards improving and expanding the use of PET detectors, including the total body imaging. This endeavor has been made possible by the support of the U. of Texas – Portugal program at the University of Texas at Austin.

room B2.38, Pasteura 5 at 10:15

dr Krzysztof Cieśla (AGH)

Light-by-light scattering and dilepton production in ultra-peripheral heavy-ion collisions with ATLAS

The presence of a large flux of photons accompanying relativistic heavyion beams leads to a significant number of photon-induced processes,including photon-photon fusion. These processes are remarkably cleanwith little or no remnant activity from the interacting particles. Iwill present the status of photon-photon fusion measurements resultingin either two photons (γγ→γγ) or two charged leptons (γγ→l+l−) inthe final state, measured by the ATLAS experiment in ultra-peripheralheavy-ion collisions.

room B2.38, Pasteura 5 at 10:15

prof. Tomasz Szumlak (AGH)

Status of the Dose-3D Project

The dose-3D project aims to provide a next-generation active phantom for rapid measurement of the deposited dose in photon therapy. During the initial development period, a dedicated, modular, and flexible DAQ system was designed and constructed along with a number of prototypes.The design of the detector configurable matrix was especially challenging. An extensive search for the best scintillating active material and suitable mechanical part provided the required robust support and sufficiently small material budget. We decided to use 3D printing technology for the final prototypes to produce both the scintillating voxels and mechanical parts. Also, considerable effort was dedicated to designing and implementing an interface between the optical fibre and the scintillating voxel. In this talk, I will give the current status of the project and prospects for future developments and commercialisation prospects.

room B2.38, Pasteura 5 at 10:15

mgr inż. Piotr Kalaczyński (AstroCeNT)

KM3NeT experiment: overview and recent results

Although intensively studied in the last decades, neutrinos still hold a number of mysteries. KM3NeT is a project aiming to uncover these. The KM3NeT experiment consists of two underwater Cherenkov neutrino telescopes, currently under construction at two different locations in the Mediterranean Sea. The KM3NeT detectors collect vast amounts of data already in their intermediate configurations. This includes sufficient number of atmospheric neutrinos to observe neutrino oscillations and perform first astrophysical neutrino searches. This talk describes the KM3NeT detectors and their basic physics programme, including results obtained with data from the early detector configurations.

room B2.38, Pasteura 5 at 10:15

prof. dr hab. Jan Królikowski (IFD UW)

Jack Steinberger (1920-2020) – in memoriam on the third anniversary of his death

Jack Hans Steinberger (1921- 2020) was an outstanding experimental particle physicist. Among his discoveries/ measurements are proof of the three-body decay of a muon (PhD 1949 ), the discovery of the π0 meson, practical implementation of the bubble chambers as a tool for accelerator physics (BNL 195-1963), experimental discovery of the difference between muon and electron neutrinos (Nobel Prize 1988 with L. Lederman and M. Schwarz), a plethora of precise measurements of the mixing and CPV in the neutral kaon system (Columbia and CERN), precise measurements of neutrino interactions with iron. (CDHS(W) experiment), ALEPH experiment at LEP.I worked with Jack in the CHSW neutrino experiment during the 1979-1989 decade. I learned from him a lot. At the third anniversary of His death, I would like to give a commemorative talk discussing His experimental heritage, focusing on the not so well known earlier results.

room B2.38, Pasteura 5 at 10:15

dr hab. Justyna Łagoda, prof NCBJ (NCBJ)

Neutrino oscillations - review of current experimental results

The existence of neutrino oscillations was confirmed 25 years ago.Since that time, a lot of experiments have been performed with different sources of neutrinos and detection techniques.Now, we know the values of the neutrino mixing angles with quite good precision, yet there are still questions to be answered, such as the neutrino mass ordering, CP-violation in the neutrino sector, or the existence of sterile neutrinos. The presentation is an extended and updated talk given at the EPS HEP 2023 conference and will summarize the current knowledge of neutrino oscillations and present recent results from selected experiments as well as some perspectives for the future.

room B2.38, Pasteura 5 at 10:15

dr hab. Grzegorz Grzelak (IFD UW)

The LUXE - Laser und XFEL Experiment - Report from the “LUXE physics and SFQED workshop” and LUXE Collaboration Meeting

In the seminar I will present the progress in the preparation of the LUXE experiment after publishing in 2023 the TDR:Technical Design Report.LUXE is an experiment currently being developed at DESY in Hamburg, that aims to use the high-quality electron beam of the European XFEL facility and a high-power optical laser.The scientific goal of the experiment is to study quantum electrodynamics in the largely unexplored territory, in the regime of strong fields (SFQED), close to and beyond the Schwinger limit, revealing the non-perturbative face of QED.

room B2.38, Pasteura 5 at 10:15

dr hab. Agnieszka Obłąkowska-Mucha, prof AGH (AGH)

Heavy flavour physics 2.0 (LHCb Upgrades)

LHCb has undergone a major upgrade during LHC LS2 (2019-2022) to cope with increased instantaneous luminosities, a full software-based trigger, and real-time analysis. This talk will include the very fresh LHCb results, the performance of the real-time readout system, and plans for the long-lived particle reconstruction. Further upgrades and reconstruction challenges for LHC Run 4 and 5 will also be discussed.

room B2.38, Pasteura 5 at 10:15

dr hab. Marcin Konecki, prof. UW (IFD UW)

The Level-1 muon trigger of the CMS experiment

The event selection in the CMS experiment is necessary to reduce the LHC event rate down to O(1kHz) suitable for event storage.This selection is done by the two stage trigger. The CMS level-1 muon trigger, is custom-hardware device, processing signals from CMS muon detectors.In the presentation the evolution and the performance of the Level-1 muon trigger system is discussed.The perspectives for upgrade for LHC Phase-II are given. The activities of Warsaw Group, responsible for the trigger operation in a barrel-endcap overlap of the CMS detector, are emphasized.

room B2.38, Pasteura 5 at 10:15

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

Second ECFA Workshop on e+e– Higgs/Electroweak/Top Factories

Second ECFA Workshop on physics and detectors for future e+e– Higgs/Electroweak/Top Factories took place two weeks ago in Paestum, Italy. I will report on the mandate, recent activities and plans of the ECFA study. In particular, I will present the so called Focus Topics, which were proposed to stimulate new activities in the field, covering both theory and experiment, analysis and algorithm development, as well as detector requirements and design optimisation. Selected results presented at the workshop will be discussed.

room B2.38, Pasteura 5 at 10:15

mgr Krzysztof Mękała (IFD UW)

Physics at a muon collider

Among future collider proposals, the idea of building a muon collider has recently been getting more and more attention. As a concept combining the advantages of electron-positron and hadron machines, a muon collider is an ideal candidate for the future large-scale project for particle physics.Nevertheless, for a long time, the completion of the project has been perceived as being technically unattainable due to the finite lifetime of a muon. However, in recent reports, no insurmountable technological issues have been identified and vivid discussion of the physics potential of such a machine has restarted. In my talk, I will outline the technical concept, demonstrating why the machine seems to be so appealing despite several outstanding technological challenges and I will explain what kind of new physics could be measured at a multi-TeV muon collider.

room B2.38, Pasteura 5 at 10:15

dr hab. Beata Brzozowska (IFD UW)

DNA damage and repair in cells exposed to high and low LET

The DNA damage response to different radiation qualities reflects their mode of action. Cells exposed to densely ionising high and scattered low linear energy transfer (LET) radiation react more strongly than to the same dose of each separately. The relationship between DNA double strand break location inside the nucleus and chromatin structure was evaluated using high-resolution transmission electron microscopy in breast cancer cells and will be presented together with fluorescence microscopic data.