High Energy Physics Seminar
2006/2007 | 2007/2008 | 2008/2009 | 2009/2010 | 2010/2011 | 2011/2012 | 2012/2013 | 2013/2014 | 2014/2015 | 2015/2016 | 2016/2017 | 2017/2018 | 2018/2019 | 2019/2020 | 2020/2021 | 2021/2022 | 2022/2023 | 2023/2024 | 2024/2025
2018-06-15 (Friday)
room B2.38, Pasteura 5 at 10:15 
mgr Marek Walczak (IFD UW)Ultra-peripheral collisions in CMS
The LHC is not only the most powerful collider for proton–proton and heavy-ion collisions, but also for photon–photon and photon–hadron interactions, offering a unique opportunity to study fundamental aspects of QED and QCD via photon-induced processes. In recent years there has been an increasing interest in these physics processes that can be studied in ultra-peripheral collisions (UPC) in hadronic colliders. During the seminar I will discuss recent results on ultra-peripheral heavy-ion collisions measured at the LHC and explain the aim of my analysis.
2018-06-08 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Grzegorz Grzelak (IFD UW)Backing Calorimeter as a muon detector - performance and physics results
The Backing Calorimeter (BAC) in the ZEUS experiment at the HERA accelerator was designed to supplement the energy measurement of jets leaking out of the central Uranium Calorimeter. BAC was manufactured and operated for 15 years of HERA activity by physicists, engineers and technicians from the Faculty of Physics at the University of Warsaw and the AGH University of Science and Technology in Kraków. It was the biggest detector constructed so far in the history of Polish contribution to the HEP experiments. For HERA-II period it was converted into a fully operational muon detector equipped with three-level muon trigger based on positional (hit) and energy readout. During the seminar the performance of the BAC calorimeter as a muon detector will be presented focusing on its contribution to the measurements of heavy vector mesons production observed in the decay channels involving muons.
2018-05-25 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Piotr Mijakowski (NCBJ)Dark matter searches at Super-Kamiokande
Super-Kamiokande is an underground water Cherenkov neutrino telescope operating in Kamioka Mine, Japan. The latest results of the searches for dark matter induced neutrinos from the Sun, the Earth’s core and the Milky Way based on atmospheric data collected with this detector in years 1996-2016 will be presented. Prospects for the detection of dark matter with the new generation of neutrino telescopes such as KM3NeT and Hyper-Kamiokande will be highlighted along with the potential contribution from the Polish groups to these projects.
2018-05-18 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Katarzyna Grzelak (IFD UW)Sterile neutrinos. Who cares?
Three reactor experiments (NEOS, STEREO and DANSS) have recently published their first results of the search for sterile neutrinos. MINOS, MINOS+ and IceCube have also set stringent constraints on the parameters of the four-neutrino flavour oscillation model. Several dedicated experiments are either in the phase of construction or are being planned. In the seminar I will answer the question what is behind the considerable interest in the not new idea of sterile neutrinos.
2018-04-27 (Friday)
room B2.38, Pasteura 5 at 10:15
mgr Piotr Podlaski (IFD UW)DRS4 – a convenient electronics not only for high energy physics experiments
Readout electronics is a very important part of every modern experiment in physics. Present particle detectors require a huge number of channels that need to be read out, digitized and stored on disk. Selecting readout electronics for the experiment which will fulfill resolution and timing requirements is a challenging task. In this seminar, I will present a relatively new alternative for readout in physics experiments – electronics based on DRS4 chips developed at PSI in Switzerland. DRS4 offers basic functionality of a digital oscilloscope, together with excellent timing performance – time resolution at the level of picoseconds and ease of integration in readout systems. In my presentation, I will focus on features, performance and applications of this electronics, along with a comparison with other solutions.
2018-04-20 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Michał Bluj (NCBJ)Recent Higgs measurements and other selected topics from the Rencontres de Moriond/QCD 2018
Since their creation in 1966 by Jean Tran Thanh Van, the Rencontres de Moriond bring together physicists for in-depth discussions in a friendly and relaxed atmosphere. The meeting, taking place in early Spring, is traditionally the place where the CERN experiments present new results obtained in the previous year.In this talk recent Higgs measurements will be presented together with a few other selected topics discussed at the Moriond meeting.
2018-04-13 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Dmytro Melnychuk (NCBJ)Overview of the latest LHCb results
The main motivation of the LHCb experiment at CERN’s Large Hadron Collider (LHC) was to perform precision measurements in CP violating observables and rare decays of hadrons containing beauty or charm quarks. However the excellent detector properties allowed to study much reacher physics program. Selected latest results related to CP violation and hadron spectroscopy with LHCb will be presented in the talk.
2018-04-06 (Friday)
room B2.38, Pasteura 5 at 10:15
prof. dr hab. Jan Krolikowski (IFD UW)Prospects for precision Higgs measurement at HL_LHC and future colliders
LHC run II at 13 TeV will amass ~ 150/fb of pp luminosity by the end of 2018. The higgs sector is, up to now, the only discovery made in LHC, the searches for the BSM signatures have, so far, been unsuccessful. Thus, the precise measurements of the higgs sector remain the only well defined experimental programme for the future colliders. Presently achieved precision in higgs production and decays @ the LHC will be discussed and compared to that required to answer the pressing physics questions in quest for BSM physics. The projected precisions at HL-LHC, ILC, CLIC, CEPC and FCC future projects will be briefly discussed.
2018-03-23 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Wojciech Krzemień (NCBJ)Test of Lepton Flavour Universality at LHCb
The Standard Model of particle physics assumes that the interactions of the three charged leptons differ only because of their mass differences. Any deviation from this Lepton Universality Principle would suggest new kind of interactions or particles beyond the Standard Model.Precision tests of lepton universality have been performed over many years by many experiments.While results comparing processes involving electrons and muons seem to be in agreement with SM, recent studies involving the tau lepton show indications of the deviation from the Lepton Universality assumption. Recent results from the LHCb experiment will be reviewed.
2018-03-16 (Friday)
room B2.38, Pasteura 5 at 10:15
prof. dr hab. Aleksander Filip Zarnecki (IFD UW)Limits on top quark FCNC decays from CLIC at 380 GeV
FCNC top decays are very strongly suppressed in the Standard Model. Observation of any such decay would be a direct signature of the physics beyond SM. Many "new physics" scenarios predict new contributions to FCNC processes and the largest engancement is in most cases expected for t->cH decay. Enhancements for the decay channel t->c gamma are more modest, but the decay has a clearly identifiable kinematic signature. Also considered is the exotic decay scenario t->c+missing energy. Prospects for measuring these decays at CLIC running at 380 GeV were studied with full detector simulation, taking luminosity distribution, beam polarization and beam induced background into account.
2018-01-26 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Marcin Misiaszek (UJ)New results on solar neutrinos from Borexino
Solar neutrinos emitted by fusion reactions occurring in the Sun provide a unique and direct way to study the interior of our star. The 50-year-long experimental effort to study solar neutrinos has been extremely rewarding both in terms of solar physics, by confirming the Standard Solar Model (SSM) predictions, and in terms of particle physics, by giving a substantial contribution to the discovery of neutrino flavour oscillations. The Borexino liquid scintillator (LS) neutrino observatory is devoted to performing neutrino observations, and is optimized for measurements in the low energy (sub-MeV) region of the solar neutrino spectrum. Borexino has performed the first direct, high-precision, wideband solar neutrino spectroscopy of the solar neutrino spectrums main components, including improving the knowledge of the CNO neutrino flux. In the presentation, the first simultaneous precision measurement of the interaction rates of solar neutrinos will be reported.
2018-01-19 (Friday)
room B2.38, Pasteura 5 at 10:15
mgr inż. Magdalena Kuich (IFD UW)Strange strangeness from NA61/SHINE
Strangeness production has been a subject of studies over 30 years. It is a key observable in one of the main goals of the NA61/SHINE experiment - in studying the onset of deconfinement. Due to properties of strange particles in hadronic matter and quark-gluon plasma, strangeness production is sensitive to the phase transition and provides indications of the onset of deconfinement. NA61/SHINE, a fixed target experiment at CERN SPS, measures strangeness production in p+p and ion-ion collisions in SPS energy range. This talk reviews a motivation to study the strangeness production as well as presents surprising results from NA61/SHINE and theoretical models.
2018-01-12 (Friday)
room B2.38, Pasteura 5 at 10:15
prof. dr hab. Barbara Badelek (IFD UW)Nucleon spin physics: present and near future
In the talk the following subjects will be tackled: basics of the spin-dependent deep inelastic scattering; status of spin-dependent parton distribution measurements and of tomographic imaging of the nucleon; need of higher energies and higher luminosities; features of the planned Electron-Ion Collider and its detectors; possible new phenomena in the now-unexplored kinematic regime reached by EIC.Electron-Ion Collider, a planned new machine to be located in the USA (BNL or JLab), will start operation about 2028.Collision centre-of-mass energy will be of the order of that at HERA but polarisation of electron, proton and light-ion beams, wide variety of heavy-ion beams, up to 1000 times increase in luminosity and wide energy variability will greatly exceed the capabilities of HERA.
2017-12-15 (Friday)
room B2.38, Pasteura 5 at 10:15
prof. dr hab. Aleksander Filip Zarnecki (IFD UW)Linear Collider Projects: Status and Prospects
Summary of results from the International Workshop on Future Linear Colliders LCWS2017 in Strasbourg will be presented with the emphasis on the recent progress towards realization of the ILC project in Japan.
2017-12-08 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Malgorzata Kazana (NCBJ)CMS Overview. Physics Highlights
The CMS experiment is finalizing analyses obtained with the 2016 proton-proton data at 13TeV.An overview of selected physics results from 2016 and highlights from operation and detector performance during the year 2017 will be presented.
2017-11-24 (Friday)
room B2.38, Pasteura 5 at 10:15
prof. dr hab. Jacek Ciborowski (IFD UW)About a new idea of measuring the electron neutrino mass
To date, the most precise value of the electron neutrino mass can be derived from measurements of the electron energy spectrum near the endpoint in a beta decay (mostly tritium). This method however presents serious difficulties if high precision is to be achieved to meet present expectations. I will present ideas regarding my own, surprisingly obvious alternative which might perhaps prove useful for determining the electron neutrino mass someday.
2017-11-17 (Friday)
room B2.38, Pasteura 5 at 10:15
prof. dr hab. Jan Królikowski (IFD UW)Run II LHC results on the elastic and total cross section
The basic formulae and experimental methodology of elastic and total cross sections will be reviewed.The 2016/17 new results from Run II LHC @ 13 TeV will be discussed and the interpretation of the data will be given.
2017-10-27 (Friday)
room B2.38, Pasteura 5 at 10:15
Victor Malka (France, Israel)Manipulating Relativistic Electrons with Intense Lasers, Laser Plasma Accelerators: the Revolution
The beauty of laser plasma accelerators relies on the control of the electrons motion with intense laser pulses. The manipulation of such electrons with intense laser pulses allows a fine mapping of the longitudinal and radial components of giant electric fields that can be optimized for accelerating charged particle or for producing X rays. To illustrate the beauty of this emerging field of science I will show how this control is achieved and how one can improve the quality of the electron beam. I’ll then show how by controlling the quiver motion of relativistic electrons intense bright X-rays beams are produced in a compact and elegant way. Finally, I’ll give some examples of applications for medicine, biology and material science.
2017-10-20 (Friday)
room B2.38, Pasteura 5 at 10:15
dr Grzegorz Zuzel (UJ)Background-free search for neutrino-less double beta decay of 76Ge with GERDA – latest results
The GERDA detector, installed in the underground laboratory at Gran Sasso (LNGS) in Italy, has been designed to search for neutrino-less double beta decay (0vbb) of 76Ge. Observation of this process would mean, among other things, that the lepton number is not conserved and would imply physics beyond the Standard Model. In GERDA high-purity Germanium (HPGe) detectors enriched in the isotope 76Ge are used. They are directly immersed in the radio-pure liquid argon, which acts as a passive and an active shield, and as a cooling medium for the detectors, simultaneously. Very recently a new half-life limit on the 0vbb decay of 76Ge of T1/2 > 8 x10^{25} y has been obtained. The background rate in the energy region of interest is so low that < 1 count is expected within the anticipated life time of the experiment. Thus GERDA is the first background-free detector devoted to searches for the 0vbb decay with high discovery potential. The design, the importance of the achieved results, and the perspectives of GERDA will be discussed.
2017-10-06 (Friday)
room B2.38, Pasteura 5 at 10:15
dr hab. Artur Kalinowski (IFD UW)Zastosowanie uczenia maszynowego w fizyce wysokich energii
Machine Learning applications in HEP
Uczenie maszynowe jest preznie rozwijajaca sie dziedzina informatyki. W seminarium omowie wybrane algorytmy i ich zastosowanie w ramach fizyki wysokich energii.
Machine learning is a quickly developing field of computer science. During the seminar I will review some interesting algorithms, and machine learning applications in High Energy Physics.