Zakład Cząstek i Oddziaływań Fundamentalnych

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 30 października (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

Top physics with the CMS experiment – selected results

Referuje:  dr hab. Marcin Konecki, prof. UW

Abstract:

The top quark is the heaviest object in the standard model (SM).

It allows for the precise test of the SM and searches for a new physics.

Thus the top quark measurements are important part of CMS physics program.

In the presentation the selection of recent CMS top-quark measurements will be given:

t-tbar production in association with charm, 3rd generation of CKM matrix elements, forward-backward asymmetry, top Yukawa coupling determination and a search for CP violation effects in top production.

 

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Join Zoom Meeting

https://us02web.zoom.us/j/84516096743?pwd=a3BYQ24zY1ZjQTF4eFIwUnM2WlNaZz09

Meeting ID: 845 1609 6743

Passcode: HEP_UW

SEMINARIUM FIZYKI WIELKICH ENERGII

 

Dnia 23 października (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

     Neutrino 2020 – conference report

 Referuje: dr hab. Katarzyna Grzelak

 Abstract:

 The XXIX International Conference on Neutrino Physics and Astrophysics was originally scheduled to take place in Chicago but due to COVID-19 was entirely virtual.

This year more than 3400 people participated from 22 June to 2 July in this biggest conference in the neutrino physics field.

In the seminar the results shown at the conference will be presented.

  

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Join Zoom Meeting

https://us02web.zoom.us/j/84516096743?pwd=a3BYQ24zY1ZjQTF4eFIwUnM2WlNaZz09

Meeting ID: 845 1609 6743

Passcode: HEP_UW

 

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 16 października (piątek) o godzinie 10:15, odbędzie się seminarium, na
którym zostanie wygłoszony referat pt.:

2020 update of the European Strategy for Particle Physics

Referuje: prof. dr hab. Jan Królikowski

Spotkanie odbędzie się za pośrednictwem platformy zoom:

Join Zoom Meeting
https://us02web.zoom.us/j/84516096743?pwd=a3BYQ24zY1ZjQTF4eFIwUnM2WlNaZz09

Meeting ID: 845 1609 6743
Passcode: HEP_UW

Serdecznie zapraszamy
dr hab. Katarzyna Grzelak
prof. dr hab. Jan Królikowski
prof. dr hab. Aleksander Filip Żarnecki

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 5 czerwca (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

The Hyper-Kamiokande experiment.

Referuje: dr hab. Justyna Łagoda (NCBJ)

Abstract:

Hyper-Kamiokande (HK) is a proposed ~200 kiloton water Cherenkov detector, a continuation of the highly successful neutrino and proton decay program based in Japan. It was approved in February 2020 by Japanese parliament and is expected to start taking data in 2027. Having the fiducial mass of ~8 times larger than its predecessor, Super-Kamiokande, HK will offer a broad physics program, including precise measurements of atmospheric, beam, solar and supernova neutrinos and searches for nucleon decay. The talk will cover the main physics goals of the experiment as well as technical information on the detector and its expected performance.

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Zoom meeting link: https://zoom.us/j/176261850

https://us02web.zoom.us/j/176261850?pwd=cWgzMkwvVjBTSm5ObTFMSnBPTndIQT09

Zoom meeting ID: 176 261 850

Password: 8z2bfx

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 29 maja (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

Prospects of searches for long-lived SUSY and doubly charged particles with MoEDAL experiment

Referuje: mgr Rafał Masełek (IFT)

Abstract:

The Monopole & Exotics Detector at the LHC (MoEDAL) is a small experiment designed to search for highly ionising avatars of a New Physics. Its main goal is to study the possible existence of magnetic monopoles, but the physics program defines over 34 distinct scenarios, targeting extra dimensions, new symmetries, topological particles and Dark Matter.

Currently, MoEDAL experiment is being upgraded to prepare for Run-3 data taking period. In my talk, I present the prospects of searches for New Physics after the upgrade. I discuss detection reach for various types of long-lived Supersymmetry and doubly charged particles, and I compare it to the results by ATLAS and CMS.

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Zoom meeting link: https://zoom.us/j/176261850

https://us02web.zoom.us/j/176261850?pwd=cWgzMkwvVjBTSm5ObTFMSnBPTndIQT09

Zoom meeting ID: 176 261 850

Password: 8z2bfx

SEMINARIUM FIZYKI WIELKICH ENERGII

 

Dnia 22 maja (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

 

Modern techniques of ultra-high energy cosmic rays detection.

 

Referuje: dr hab. Jarosław Stasielak (IFJ)

Abstract:

Studies on ultra-high energy cosmic rays, those exceeding energy $10^{18}$ eV, are conducted with giant ground-based detectors recording extensive air showers (cascades of secondary particles) induced by cosmic ray particles in the atmosphere. Over recent years, these studies have dramatically advanced our understanding of ultra-high energy cosmic rays. Nevertheless, the results obtained so far neither allow us to determine the sources of these most energetic particles we know in the Universe nor to explain the origin of the observed cosmic ray flux suppression above $4\times 10^{19}$ eV. The explanation of these puzzles is one of the most important goals of modern astrophysics. At the same time, the results obtained indicate that further advances in research on ultra-high energy cosmic rays require improving measuring capabilities of detectors. Therefore, there is a special need to search for new experimental solutions to improve the accuracy of measurements of extensive air showers, while reducing the costs of construction and operation of detectors. I will present modern techniques for the detection of ultra-high energy cosmic rays, both classic well-proven methods as well as the new radio detection method, intensively developed over the last decade, which is currently considered the most promising technique. As examples of works on alternative methods of extensive air shower detection, the microwave and radar detection techniques will be discussed. Also I will present the main goals and plans for the upgrade of the Pierre Auger Observatory — the largest detector of ultra-high energy rays.

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Zoom meeting link: https://zoom.us/j/176261850

https://us02web.zoom.us/j/176261850?pwd=cWgzMkwvVjBTSm5ObTFMSnBPTndIQT09

Zoom meeting ID: 176 261 850

Password: 8z2bfx

SEMINARIUM FIZYKI WIELKICH ENERGII

 

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

 Do Kaons change their mass inside hot and dense nuclear matter?

 Referuje: dr hab. Krzysztof Piasecki (IFD UW)

Abstract:

According to QCD, strong interactions of a hadron with virtual quark-antiquark pairs in the vacuum are the process responsible for the acquisition of most of hadron’s mass from the sum of current quark masses. During the relativistic collision of heavy ions the reverse process should occur, called the partial restoration of chiral symmetry. A hadron in hot and dense nuclear matter should change its basic properties like mass and decay constant with respect to the well known values in vacuum.

Kaons produced in heavy ion collisions around threshold for their production in NN collision appear to be a good probe of these effects.

First comparisons of experimentally found phase space distributions of kaons to the transport model calculations suggested a clear sensitivity to this effect. Meanwhile the theoretical predictions suggested that the mass change should be not only density-dependent, but also momentum-dependent. In the seminar these comparison will be presented.

However, data from collisions around strangeness threshold published recently by HADES and FOPI suggest a much broader and complex landscape. Any extraction of possible changes of K- mass has to account for the downfeed from Phi meson decay. Also, comparisons for K0s and Lambda emitted from Au+Au at 1.2A GeV show that the model description is still not fully consistent.

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Zoom meeting link: https://zoom.us/j/176261850

https://us02web.zoom.us/j/176261850?pwd=cWgzMkwvVjBTSm5ObTFMSnBPTndIQT09

Zoom meeting ID: 176 261 850

Password: 8z2bfx

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 8 maja (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

ELITPC: toward studying nuclear reactions at astrophysical energies

Referuje: mgr Mateusz Fila (IFD UW)

Abstract:

In the joint effort of several members of the Institute of Experimental Physics at the Faculty of Physics, University of Warsaw an active target TPC with electronic readout – ELITPC – is being developed. The detector is suited for studying nuclear reactions of the astrophysical interest at the stellar relevant energies. I will present the general detector design, used techniques and done developments as well as describe ongoing works and plans for the near future.

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Zoom meeting link: https://zoom.us/j/176261850

Zoom meeting ID: 176 261 850

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 24 kwietnia (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

PolFEL – Polish Free Electron Laser and its research capabilities

Referuje: Paweł Krawczyk (NCBJ)

Abstract:

PolFEL is a new research facility currently under construction at NCBJ at Otwock-Świerk in Poland. The facility will comprise a free electron laser powered by an entirely superconductive accelerator designed for continues wave (cw) and long pulses (lp) operation. Besides the photon beams provided to the experimental end stations, the gain of the accelerator physics and engineering capabilities are a desired benefit of this project.

PolFEL will be furnished with three undulator chains settled in the two accelerator branches. The full energy branch will provide an electron beam with energy up to 155 MeV in cw mode and up to 187 MeV in lp mode that will allow to generate the coherent light with the wavelength down to 55 nm (in the 3rd harmonics). The striving to attain VUV ranged beam in spite of limited electrons energy brings forth the need of a challenging, short period undulator design and impels to minimize an electron beam emittance. The low energy branch will provide the electrons with energies up to 80 MeV in cw. The radiation wavelength will cover two spectral ranges: IR – from 5 µm up to 50 µm and THz – covering the so called “terahertz gap” of 0.3 THz – 5 THz. Photon beamlines capable of providing the photon diagnostic setups and guiding the beams to the experimental stations will be constructed adjoined to the undulator chains. Still another experimental station will employ femtosecond x-ray pulses in the keV range generated in Compton backscattering process employing the accelerated electron beam and photon beam from auxiliary optical laser.

PolFEL is constructed by a Consortium of 8 institutions lead by NCBJ. The project received funding from the European Regional Development Fund in the framework of the Smart Growth Operational Programme, Measure 4.2: Development of modern research infrastructure of the science sector and, noticeably, a support from the Industry.

Serdecznie zapraszamy

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

The meeting will take place on zoom.us platform.

Zoom meeting link: https://zoom.us/j/176261850

Zoom meeting ID: 176 261 850

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 17 kwietnia (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

Machine Learning event identification in H → ττ analysis of CMS

Referuje: Michał Olszewski

 

Abstract:

The H → τ+τ− channel (branching fraction about 6%) is currently one of two (next to H → bb̄ with branching fraction of about 57%) at the LHC best suited to perform measurements of 125 GeV Higgs boson couplings to fermions. The first observation of this process in a single experiment was achieved by the CMS Collaboration and published in 2017. The analysis summarized in the publication is driven by several characteristics specific for aforementioned Higgs boson decay mode. First, the tau lepton cannot by directly observed at the detector due to short lifetime. Second, it decays either leptonically or semi-leptonically due to invariant mass larger than mass of the lightest mesons. Furthermore, the large QCD background at LHC and presence of the neutrinos in the final state enforces usage of sophisticated algorithms for tau identification and ditau system mass reconstruction (respectively). In the first part of the talk I’ll shortly present how CMS analysis deals with above topics. In the second part I’ll show how machine learning techniques can by used to reinforce the analysis sensitivity to the signal.

Spotkanie odbędzie się za pośrednictwem platformy zoom:

Zoom meeting link:  https://zoom.us/j/176261850

Zoom meeting ID: 176 261 850