SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 03 grudnia (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Latest results from the NA61/SHINE experiment at CERN.”

Referuje: mgr Piotr Podlaski

Abstract:

NA61/SHINE is a multipurpose fixed-target facility at the CERN Super Proton Synchrotron. The main goals of the NA61/SHINE strong interactions program are to look for the critical point of strongly interacting matter and study properties of the onset of deconfinement. To reach these goals, hadron production measurements are performed in the form of a two-dimensional scan by varying collision energy and system size. Additionally, NA61/SHINE performs reference hadron production measurements for neutrino and cosmic ray experiments.

In this seminar the most recent NA61/SHINE results will be summarized. In particular, results from p+p, Be+Be, Ar+Sc and Pb+Pb reactions on hadron production spectra and fluctuations will be presented. The NA61/SHINE data will be compared with results from other experiments and predictions of various theoretical models. The talk will be concluded with plans and motivation for the NA61/SHINE operation and measurements after Long Shutdown 2 and 3 at the CERN SPS, followed by a brief summary of the ongoing hardware upgrade.

 

Serdecznie zapraszamy

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

High Energy Physics Seminar (3 December 2021) · Indico (cern.ch)

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 26 listopada (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„ELITPC: the first experiments with the full scale-prototype of an active-target Time Projection Chamber”

Referuje: mgr. Mateusz Fila

Abstract:

An active-target Time Projection Chamber (TPC) has been developed at the University of Warsaw for studying nuclear reactions of astrophysical interest. The flagship experiment of the detector is the measurement of the cross-section of 16O(gamma, alpha)12C photodisintegration reaction down to the energy of 1 MeV in the centre of mass using monochromatic gamma-ray beams at HIgS, USA and ELI-NP, Romania.
In the summer of 2021, the first experiments with the full-scale prototype of the chamber took place at the IFJ PAN Cracow. The performance of the detector was tested in experiment at the Van de Graaf accelerator at the IFJ PAN. The CO2 filled TPC was exposed to the 13 MeV gamma beam produced in the 15N(p, gamma)16O reaction. Events corresponding to the 16O(gamma, alpha)12C photodisintegration reaction were observed.
In another experiment, the neutron beam of IGN-14 MeV neutron generator at the IFJ PAN was used to populate the Hoyle state in in the 12C(n,n’) reaction with CO2 gas inside the detector. The products of 3-alpha decay of the Hoyle state were observed.
Preliminary results of the measurements at IFJ will be presented and an outlook on the experiment at HIgS and plans for ELI-NP will be given.

This scientific work is supported by the Polish Ministry of Science and Higher Education from the funds for years 2019-2021 dedicated to implement the international co-funded project no. 4087/ELI-NP/2018/0, by University of Connecticut under the Collaborative Research Contract no.UConn-LNS_UW/7/2018 and by the National Science Centre, Poland, under Contract no. UMO-2019/33/B/ST2/02176.

Serdecznie zapraszamy

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

High Energy Physics Seminar (26 November 2021) · Indico (cern.ch)

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 19 listopada (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Searches for exotic physics by comparing the fundamental properties of antiprotons and protons using Penning Traps at BASE experiment”

Referuje: Barbara Maria Latacz, RIKEN, on behalf of the BASE collaboration

Abstract:

The Standard Model is the most successful theory in physics, however, it does leave several questions open. For example the striking matter-antimatter imbalance in the visible Universe has yet to be understood, and the microscopic properties of dark matter have yet to be discovered. Related questions can be studied by ultra-high precision comparisons of the fundamental properties of protons and antiprotons, like the charge-to-mass ratios or the magnetic moments, which are subject of the experiments of the BASE collaboration at CERN. The core tool of BASE is the spectroscopy of single trapped antiprotons and protons using superconducting detectors in advanced cryogenic Penning trap systems. One
of the state-of-the-art results of the BASE collaboration is the measurement of the antiproton magnetic moment with a fractional precision of 1.5 parts in a billion [C. Smorra et al., Nature 550, 371 (2017)], which improved previous measurements by more than three orders of magnitude. Very recently, BASE extended its experimental program and has
set stringent limits on axion to photon conversion in the neV mass range, using superconducting LC circuits are haloscope detectors
(J. A. Devlin et al., Physical Review Letters 126.4 (2021): 041301).

In my talk, I will summarise the recent achievements of BASE, I will report on the progress in improving the frequency resolution of the experiment, and will outline strategies to further improve our high-precision studies of matter-antimatter symmetry to anticipated precision at the parts per trillion level. I will also summarize progress towards the development of the new broad-band axion haloscope BASE CDM.

 

Serdecznie zapraszamy

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

High Energy Physics Seminar (19 November 2021) · Indico (cern.ch)

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 5 listopada (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Test of discrete symmetries with spin observables at J-PET.”

Referuje: mgr. Kamil Dulski  

K. Dulski, A. Gajos, P. Moskal
Jagiellonian University, M. Smoluchowski Institute of Physics

Abstract:
The phenomenon of positron-electron annihilation is a subject-of-interest in many fields from medical imaging to fundamental studies. Two photon annihilation of positron-electron pair is already well established mode allowing for determination of annihilation position distribution, by means of Positron Emission Tomography (PET). However, a particularly interesting research object is the unique relationship that can bind a positron and an electron, that is called positronium. Positronium as the lightest purely leptonic bound state can serve as a sensitive probe of effects such as violation of discrete symmetries [1,2]. A particularly interesting case is testing the CPT invariance, a violation of which can be searched for as non-disappearing angular correlations between the photons from positronium annihilation and its spin. So far, attempts to experimentally investigate this effect have been limited mostly by the knowledge of the latter [2,3]. An improvement in the estimation of the spin direction was recently proposed by the Jagiellonian PET (J-PET) collaboration, introducing the J-PET detector as a new device which allows for the estimation of the positron spin axis along with the polarization of photons from positronium annihilation on an event-by-event basis [1,5,6]. So far, it is the only detector capable of such operation. The results of the most precise measurement of an angular correlation operator sensitive to violation of the combine symmetry under charge conjugation (C), parity (P) and time reversal (T) on the study of ortho-positronium (o-Ps) annihilations will be presented. The presented results do not indicate any violation at the level of the per mille [1], improving the previous measurements [2,3].

The new method of image reconstruction based on trilateration will be additionally presented [7]. It allows to determine the position of the o-Ps annihilation, which resulted in emission of three photons. Knowing the o-Ps annihilation position translated directly into the precision of estimating the o-Ps spin direction. The first reconstructed image of positron annihilation based on 3-photon o-Ps decays will be shown as a result from trilateration reconstruction [1]. Finally the world’s first positronium image of heart tissue from a patient will be presented [8]. The positronium image is a completely new imaging technique which is based on the determination of the mean positronium lifetime in each voxel. Resulting image allowed to distinguish the type of the tissue based on the mean positronium lifetime, which is not possible to distinguish by a conventional PET.

[1] P. Moskal et al., “Testing CPT symmetry in ortho-positronium decays with positronium
annihilation tomography”, Nat. Comm. 12 (2021) 5658
[2] W. Bernreuther et al., “How to test CP, T, and CPT invariance in the three photon decay of
polarized 3 S 1 positronium”, Z. Phys. C41 (1988) 143
[3] P. A. Vetter and S. J. Freedman, “Search for CPT-Odd Decays of Positronium“, Phys. Rev.
Lett. 91 (2003) 263401
[4] T. Yamazaki et al., “Search for CP Violation in Positronium Decay”, Phys. Rev. Lett. 104 (2010) 083401
[5] P. Moskal et al., „Synchronisation and calibration of the 24-modules J-PET prototype with 300 mm axial field of view”, IEEE Trans. Instrum. Measur. 70 (2021) 2000810
[6] S. Niedźwiecki et al., „J-PET: A New Technology for the Whole-body PET Imaging”, Acta Phys. Pol. B 48 (2017) 1567
[7] A. Gajos et al., “Trilateration-based reconstruction of ortho-positronium decays into three photons with the J-PET detector”, NIM A 819 (2016) 54
[8] P. Moskal et al., “Positronium imaging with the novel multiphoton PET scanner”, Sci. Adv. 7(2021) eabh4394

Serdecznie zapraszamy

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

High Energy Physics Seminar (5 November 2021) · Indico (cern.ch)

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

 

Dnia 29 października (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Sensitivity of future linear colliders to processes of dark matter production with light mediator exchange.”

Referuje: Prof. dr hab. Aleksander Filip Zarnecki 

Abstract:
As any e+e- scattering process can be accompanied by a hard photon emission from the initial state radiation, the analysis of the energy spectrum and angular distributions of those photons can be used to search for hard processes with an invisible final state. Thus high energy e+e- colliders offer a unique possibility for the most general search of dark matter (DM) based on the mono-photon signature. Production of DM particles at the International Linear Collider (ILC) and Compact Linear Collider (CLIC) experiments was studied for scenarios with a light mediator exchange. Limits on the production cross section and mediator couplings were set in a simplified DM model as a function of the mediator mass and width based on the expected two-dimensional distributions of the reconstructed mono-photon events. Systematic uncertainties were studied in details as well as the impact of the beam polarisation.

 

Serdecznie zapraszamy

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

Seminarium Fizyki Wielkich Energii (29 October 2021) · Indico (cern.ch)

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

 

Dnia 22 października (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Reconstructing  Air Shower properties with Radio Arrays”

Referuje: dr Pragati Mitra (IFD)

Cosmic rays have been an intriguing field of research since their discovery more than 100 years ago. The origin of these highest energetic particles still remain a mystery. When high-energy cosmic rays impinge upon the atmosphere, they create extensive air showers, which are cascades of secondary particles that are observed with various methods. Measuring the radio emission of air showers is a relatively new but increasingly popular method to extract information about the mass composition of cosmic rays. In this talk I will introduce the principles of radio detection technique focusing on the results obtained with The Low-Frequency Array (LOFAR) radio telescope. I will describe the method of reconstructing the shower maximum Xmax- an important estimator of cosmic ray mass, and ways to enhance the accuray of Xmax estimation by including local atmospheric effects. We will also explore the prospects of other cosmic ray mass estimators in addition to Xmax. I will also explain the prospects of a semi-analytic air shower simulation code for radio emission that is few orders of magnitude faster than the conventional monte carlo counterparts. In the end, I will briefly mention our current research plans with GP300- a prototype for The Giant Radio Array for Neutrino Detection (GRAND).

 

Serdecznie zapraszamy

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

 

 

Seminarium Fizyki Wielkich Energii (22 October 2021) · Indico (cern.ch)

 

 

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

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

„How to determine precisely luminosity at pp machine (LHC)?”

Referuje: prof. dr hab. Krzysztof Doroba (IFD)

Abstract: in the talk presented will be methods used by the CMS to measure with 1.2 % accuracy luminosity delivered by LHC. The aim of the talk will be to stress an effort required to obtain such precision. In addition mentioned  will be results on cross sections obtained by the TOTEM experiment in „luminosity indpendent way”, These results in particular concern discovery of the ODDERON, proposed in 1973 by L. Lukaszuk (and B.Nicolescu)

 

Serdecznie zapraszamy

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

Seminarium Fizyki Wielkich Energii (15 October 2021) · Indico (cern.ch)

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

 

Dnia 8 października (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Highlights from the Run-2 LHC results”

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

I will present a very subjective selection of analyses using (mostly) full Run-2 data:

W boson mass measurement, a short review of the status of the Higgs boson measurements, four top quark production, vector boson scattering and a measurement on LFV from LHCb.

 

Serdecznie zapraszamy

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

Seminarium Fizyki Wielkich Energii (8 October 2021) · Indico (cern.ch)

 

SEMINARIUM FIZYKI WIELKICH ENERGII

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 11 czerwca (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Physics and Technology of the Deep Underground Neutrino Experiment”

Referuje: Dr Jarosław Nowak (Lancaster University)

Abstract: The Deep Underground Neutrino Experiment (DUNE) is a multinational effort hosted by Fermilab to address some of the biggest open questions in particle physics, particularly whether charge-parity symmetry is violated in neutrino oscillation. DUNE will make precise measurements of the parameters governing long-baseline neutrino oscillation by observing an intense neutrino beam with a near detector complex onsite at Fermilab and a massive, underground, far detector located ~1300 km away at the Sanford Underground Research Facility in Lead, South Dakota. DUNE will also be sensitive to supernova burst neutrinos and signatures of physics beyond the Standard Model, including baryon number non-conservation. In this seminar, I will describe the simulation-based analysis of DUNE’s sensitivity to long-baseline neutrino oscillation, supernovae and BSM phenomena. I will introduce DUNE technology, including the new neutrino beamline, far detector modules design and the near detector complex.

 

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 28 maja (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Precise atomic spectroscopy in search for unknown interactions”

Referuje: prof. dr hab. Krzysztof Pachucki (IFT)

I will present very recent results from high precision spectroscopy of the hydrogen versus the muonic hydrogen, the helium versus the muonic helium, with the aim to find discrepancies with predictions of the Quantum Electrodynamic theory, and to discover unknown yet interactions at the atomic scale.

 

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