Zakład Cząstek i Oddziaływań Fundamentalnych

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 14 Października(piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Studies of hyperon decays using hyperon-antihyperon pairs from J/psi decays”

Referuje: prof. dr hab. Andrzej Kupść  (Uppsala University & BP3 NCBJ)

Abstract:

Hyperon-antihyperon pairs from decays of vector charmonia are spin entangled. Furthermore, if the charmonia are produced in electron-positron collisions the hyperons can be polarized. Millions of the hyperon–antihyperon pairs events are available in the world’s largest data of 10^10 J/psi and 2.7×10^9 psi(2S) collected at the BESIII experiment . The entangled pairs are used for precision determination of hyperon and antihyperon decay amplitudes and to test CP symmetry in the decays. The hyperon CP-symmetry tests are complementary to the direct CP-violation studies in kaon decays. I will present multi-dimensional analysis methods, developed by the Uppsala and Warsaw groups, that make use of the polarization and entanglement to achieve best sensitivity in the hyperon-decay measurements. Recent BESIII results obtained using these methods include studies of J/psi decays into Lambda-antiLambda and Xi- anti Xi+ published in Phys. Rev. Lett. and Nature, respectively. For the cascade decay chain, the exclusive measurement allows for three independent CP tests and determination of the strong and weak phase differences in the decay amplitudes.

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 7 Października (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„COMPASS – a versatile facility at CERN”

Referuje: prof. dr hab. Barbara Badełek  (IFD UW)

Abstract:

The purpose of COMPASS is the study of hadron structure and hadron spectroscopy with high intensity muon and hadron beams.

The Collaboration is formed by about 200 physicists from 25 countries.

The facility was approved 25 years ago and the physics experiments started in 2002  with a muon beam, polarised proton and deuteron targets. These semi-inclusive deep inelastic scattering (SIDIS) reveals a detailed  quark-gluon structure of the nucleon, in particular the gluon polarisation and transverse-momentum-dependent correlations.

The years 2008 and 2009 were dedicated to the hadron spectroscopy programme with pion and proton beams scattering off a liquid hydrogen target and nuclear targets. An unprecedented amount of data was collected and showed subtle details of the light-meson spectrum. A dedicated study of the pion polarisability using Primakoff scattering of pions from heavy nuclei was also performed.

Phase II of COMPASS commenced in 2014 and is primarily devoted to the transverse and 3D structure of nucleons using Deeply Virtual Compton scattering (DVCS), Hard Exclusive Meson Production (HEMP), SIDIS and polarised Drell-Yan (DY) reactions.

I shall repeat a plenary talk which I gave in September 2022 at the „Quarks in Nuclear Physics” conference in Florida (USA).

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

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

seminarium, na którym zostanie wygłoszony referat pt.:

„LHCb reborn: the start of a new era”

Referuje: Prof. Chris Parkes (University of Manchester (GB))

Abstract:

The Large Hadron Collider-beauty (LHCb) experiment completed its initial operating period (2010-2018) and has published over 600 scientific papers. Recent highlights of the physics output will be reviewed. The next era is now starting for LHCb, with the Upgrade I experiment having been installed. This is a major upgrade which will allow a significant increase of instantaneous luminosity and improve efficiencies and flexibility through the introduction of a fully software based trigger at 40MHz. Beyond this the collaboration is planning the Upgrade II for the 2030s, an ambitious flavour physics experiment at the HL- LHC, and a larger scale project than previously undertaken by LHCb. This will use a range of novel technological developments with many opportunities for the involvement of new collaborators in the research, design and construction activities

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

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

seminarium, na którym zostanie wygłoszony referat pt.:

„New description of neutrino flavour evolution in solar matter — oscillations or no oscillations?”

Referuje: Prof. dr hab. Jacek Ciborowski

Abstract:

During the seminar I will present new analysis performed with ZEUS data on exclusive Assuming that the interacting neutrino and the solar matter can be treated as an open quantum system we formulate a formalism of neutrino state evolution according to a quasilinear extension of the von Neumann equation. We broaden the classical linear Wolfenstein formalism (MSW effect) by means of reinterpreting the results in terms of the quantities appropriate for the quasilinear approach. We show that the dynamics of the neutrino evolution („flavour conversion”) is effectively governed by the distance of the evolving system to the structural instability point of the evolution equation. We obtain similar predictions for the averaged neutrino survival probability measured on Earth in both approaches, differing inside the Sun where the quasilinear evolution predicts a suppression of oscillations. A nonzero mean energy transfer between the neutrino and the Sun supports the initial assumption. We also discuss the speed of the state evolution in both approaches. Ways to test on Earth the quasilinear hypothesis will be mentioned.

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 27 maja (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Measurement of the cross-section ratio σ(ψ(2S)) / σ(J/ψ(1S)) in exclusive photoproduction at HERA.”

Referuje: dr hab. Grzegorz Grzelak

Abstract:

During the seminar I will present new analysis performed with ZEUS data on exclusive vector meson photoproduction – measurement of the cross section ratio of two charmonia states: ψ(2S) and J/ψ(1S). The analysis was performed using muonic decay channels of the investigated vector mesons.

The ratio of their production cross sections has been measured as a function of W (photon–proton centre-of-mass energy) and |t| (squared four-momentum transfer at the proton vertex) and compared to previous data in photoproduction and deep inelastic scattering and with predictions of QCD-inspired models of exclusive vector-meson production.

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 20 maja (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Looking forward to new physics and neutrinos at the LHC and beyond.”

Referuje: dr Sebastian Trojanowski (NCBJ)

Abstract:

The search for new physics and studying the properties of the Standard Model (SM) neutrinos are among the main frontiers in contemporary particle physics. In particular, new physics searches at the Large Hadron Collider (LHC) have traditionally been performed in the high-pT region. If new particles are light and weakly-coupled, however, this focus may be misguided: light particles are typically highly concentrated within a few mrad of the beam line. This opens up a novel direction in the LHC searches focusing on sub-GeV beyond the SM species and neutrino measurements, which will be initiated by the FASER experiment during Run 3. In the talk, we will discuss the prospects of these and other related efforts that can extend towards the High-Luminosity phase of the LHC in the recently proposed Forward Physics Facility (FPF).

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 13 maja (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„DIS landscape 2022 – a personal view”

Referuje: prof. dr hab. Barbara Badełek (IFD UW)

Abstract:

For the last 50+ years the Deep Inelastic Scattering is a source of our knowledge concerning properties of building blocks of nearby matter:

nucleons and nuclei. DIS has supplied a wealth of astonishing discoveries and induced a development of the theory of strong interactions, the (perturbative) Quantum ChromoDynamics.

A panorama of contemporary knowledge and problems concerning the free- and bound nucleon structure will be given and directions of future investigations and available tools will be presented.

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

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

seminarium, na którym zostanie wygłoszony referat pt.:

„The NOvA Experiment and Neutrino Oscillations”

Referuje: Dr Tomas Nosek (NCBJ)

Abstract:

NOvA is a two detector long-baseline neutrino oscillation experiment using Fermilab’s 700 kW NuMI neutrino beam. It studies the disappearance of muon (anti)neutrinos and the appearance of electron (anti)neutrinos in the beam over a distance of 810 km between the detectors.
The experiment has made over 4σ-significant observation of electron antineutrino appearance in muon antineutrino beam and constrained the oscillation parameters |∆m2 32|, sin2 θ23, and δCP. In this seminar, I will present the main features of the NOvA experimental setup and the neutrino oscillation analysis within the standard paradigm of three neutrinos mixing. I will point out the key differences to the similar T2K experiment and its complementarity. I will review the 2020 results of NOvA and T2K and remind the potential of their combined analysis, which has the power to break the degeneracies of the individual measurements. By continuing to collect data before the dawn of next-generation long-baseline experiments in the late 2020s, the statistical uncertainty will be reduced, and certain physics milestones might be within reach. To that end, it is vital to understand the major sources of systematic uncertainties and their correlations for both the interpretation and precision of the results and for further improvements of the analyses.

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

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

seminarium, na którym zostanie wygłoszony referat pt.:

„The b-physics with the CMS experiment – an update”

Referuje: dr hab. Marcin Konecki, prof. UW

Abstract:

CMS is a general purpose experiment at the LHC, designed for a rich physics program that includes b-physics studies.
Selected recent CMS results in b-physics will be presented: measurement of CP-violation phase Phi_s, results on B^0/B^0_s
decaying to mu^+ mu^- and observations of new states and decay modes in b-sector.

Serdecznie zapraszamy

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 08 kwietnia (piątek) o godzinie 10:15, w sali B2.38 odbędzie się

seminarium, na którym zostanie wygłoszony referat pt.:

„Digital Signal and Image Processing in Jagiellonian Positron Emission
Tomography”

Referuje: Dr Lech Raczyński (NCBJ)

Abstract:

This presentation is devoted to introduction of data processing algorithms in Jagiellonian PET (J-PET) scanner. In contrast to state-of-the-art PET scanners, in the J-PET detector multiple small inorganic crystal scintillators are replaced with a long plastic scintillator strips. The operational principles of the J-PET scanner are similar to conventional tomographs, except that the highly accurate time information is of paramount importance. Therefore, the J-PET scanner demands a preparation of novel methods on each step of the data processing. The goal of the work presented in this talk is a development of the signal and image processing algorithms taking into account uniqueness of the J-PET detector. The proposed methods include: signal recovery based on samples of a waveform registered on photomultiplier output,reconstruction of position of interaction of annihilation photon in the scintillator strip,classification of PET events types and image reconstruction that operates exclusively in the image space.

Serdecznie zapraszamy

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