Author: Wojciech Orpel

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

 

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

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

 

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

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

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

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 21 maja (piątek) o godzinie 10:15, odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Vector Boson Scattering as a gate to New Physics”

Referuje: dr hab. Michał Szleper (NCBJ)

In the lack of direct observation of new particles at the LHC, indirect searches for physics beyond the Standard Model gain new importance.

Vector Boson Scattering (VBS) processes provide crucial tests of the Standard Model mechanism of electroweak symmetry breaking and allow for indirect searches for New Physics.  After a pedagogical introduction to the physics of VBS, I will present the concept of BSM searches in the quasi-model-independent framework of effective field theories, their current status and future plans.  I will give a review of recent VBS-related results from the LHC Run 2 data collected by the CMS experiment and selected advances in theory and phenomenology.

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

„Searches for long-lived particles at CMS”

Referuje: dr Małgorzata Kazana  (NCBJ)

Models beyond the SM predict new particles with a wide range of lifetimes. The weak-scale particles can get a long lifetime which lead to unconventional signatures in the detector with respect to these from prompt decays, often requiring customized techniques to trigger and identify them.

The CMS experiment at the LHC collider puts a growing effort to expand the reach for long-lived signals. During the seminar, recent studies on long-lived particles will be shown.

 

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 30 kwietnia (piątek) o godzinie 10:15, odbędzie się seminarium pt.:

Warsaw contributions to the 2021 International Workshop on Future Linear Colliders, LCWS2021 (part 2)

Referują:

Krzysztof Mękała: „Heavy Neutrinos at Future Linear e+e- Colliders”

With the Standard Model being unable to describe the observed baryon asymmetry or dark matter density in the universe, many models of the New Physics introduce heavy neutrino species as a possible explanation for these effects. Dirac or Majorana neutrinos with masses above the EW scale could be produced at future linear e+e- colliders, like the Compact LInear Collider (CLIC) or the International Linear Collider (ILC).

We studied the possibility of observing production and decays of heavy neutrinos in qql final state at the ILC running at 500 GeV and 1 TeV, and the CLIC running at 3 TeV. The analysis is based on the WHIZARD event generation and fast simulation of the detector response with DELPHES. Dirac and Majorana neutrinos with masses from 200 GeV to 3.2 TeV are considered. Estimated limits on the production cross sections and on the neutrino-lepton coupling are compared with the current limits coming from the LHC running at 13 TeV, as well as the expected future limits from hadron colliders.

 

Jan Klamka: „Search for the pair-production of charged IDM scalars at high energy CLIC”

Compact Linear Collider is the next energy frontier e+e- collider proposed at CERN. Its goal is to precisely test Standard Model (SM) predictions, as well as directly search for the „new physics”. One of the models predicting such phenomena is the Inert Doublet Model (IDM), a very simple extension of the SM scalar sector. It brings in four new particles, including one good dark matter candidate. CLIC sensitivity for discovery of the IDM scalars has been tested, considering 23 benchmark points in the model parameter space. Both fast and full detector simulation techniques were used, where Delphes model of the CLIC detector was extended to include background from gamma-gamma interactions, essential in this analysis. Study shows that IDM particles can be discovered at CLIC for most of considered benchmark points, with high statistical significance.

 

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

„Test of Lepton Flavour Universality at LHCb”

Referuje: dr. Wojciech Krzemień  (NCBJ)

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 the years by many experiments.

The recent studies of the LHCb experiment indicate evidence for the breaking of lepton universality in beauty-quark decays, with a statistical significance of 3.1 standard deviations.

In the talk the last results from the LHCb will be discussed in the context of previous and future measurements.

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