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14/01/2018, 13:30
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David Horák (České vysoké učení technické v Praze), Radek Novotný (CTU FNSPE)14/01/2018, 16:20Presentation
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Jan Půček (CTU FNSPE)14/01/2018, 17:20
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Peter Švihra (České vysoké učení technické v Praze)15/01/2018, 11:20
We describe here fast optical cameras based on a new silicon pixel sensor, which in combination with the Timepix chips, will provide nanosecond scale time resolution and high quantum efficiency for photons with wavelength between 400 and 1050nm.
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Ondřej Sedláček (CTU FNSPE)15/01/2018, 11:50
Vysokoenergetická fyzika potřebuje pro svá měření a výzkum co nejpřesněji definované vlastnosti srážejících se svazků, proto fyzika urychlovačů je esenciálním aspektem těchto experimentů. Porozumění základům fyziky a technologie svazku poskytuje základ pro oblasti teorie svazku či až inženýrské aplikace. K základům fyziky urychlovačů patří oblasti optické soustavy a příčné dynamice, které...
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Pavel Gajdoš (České vysoké učení technické v Praze)15/01/2018, 12:10
Pro urychlení elektronů pomocí laserem řízené plazmové vlny je nutné zajistit jejich dostatečný počet v urychlovací fázi. K tomu lze využít několika metod. Jedna z možností je kolize dvou na sebe kolmých laserových impulzů. Hlavní svazek vytváří plazmovou vlnu a vedlejší, který je slabší, do ní injektuje elektrony. V této práci je uveden návrh optické soustavy určené pro přesnou synchronizaci...
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Roman Lavička (CTU FNSPE)15/01/2018, 13:45
There are several different predictions for the behaviour of the gluon distribution in nuclei at small Bjorken $x$ and experimental data is needed to chose among them. This is achieved by measuring the cross section of processes specially sensitive to this parton distribution. We focus on ultra-peripheral collision of lead-lead nuclei producing a J/$\psi$ meson. Our main task is to calculate...
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Jan Půček (CTU FNSPE)15/01/2018, 14:40Presentation
Luminozita je veličina, která udává poměr mezi frekvencí interakce a jejím účinným průřezem. Velkou výhodou luminozity je nezávislost na procesu. Ze znalosti luminozity a frekvence interakcí lze spočítat účinný průřez dané interakce. Na urychlovačích, používajících shluky částic ve svazku, je rozšířena metoda určení luminozity nesoucí název po fyziku Simonu van der Meeru. Pomocí této metody,...
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David Horák (České vysoké učení technické v Praze)15/01/2018, 15:00
Difrakční procesy se ukazují jako velmi velmi dobrá sonda do struktury protonu. Tyto procesy se v 60. letech pokoušela vysvětlit Reggeho teorie pomocí výměny tzv. pomeronu, a to velmi úspěšně. V této přednášce představím koncept této teorie a nahlédneme na ní z pohledu moderní kvantové chromodynamiky.
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Dagmar Bendová (CTU FNSPE)15/01/2018, 15:55Presentation
The high energy limit of QCD can be studied using the Deep inelastic scattering (DIS) at small Bjorken-x. Under these circumstances the gluon density rapidly increases. However the increase is eventually tamed by recombination, as the experimental data suggest us, which leads to the effect called parton saturation. To predict the cross-section of DIS we need to determine the cross-section of...
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Marek Matas (České vysoké učení technické v Praze)15/01/2018, 16:25
Using the rcBK evolution equation to calculate the scattering amplitude and from it, the Transverse Momentum Distribution functions can be very useful because of its use in calculation of factorised cross sections. In this contribution, we will address some key aspects of this topic as well as show, how such computation can be carried out.
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Michal Broz (České vysoké učení technické v Praze)15/01/2018, 17:20
A compact detector called AD was added to the ALICE apparatus at the beginning of the LHC run 2 in order to extend the trigger capabilities. In this talk we will concentrate on all kinds of boring details about calibration, data reconstruction and quality assurance in order to provide a picture of how a small part of modern high-energy experiment works in the real life.
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Vladimír Wagner (CTU FNSPE)15/01/2018, 19:00
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Jaroslav Štorek (CTU FNSPE)16/01/2018, 09:00
V příspěvku budou po krátkém úvodu standardního modelu vysvětleny všechny základní pojmy fyziky vysokých energií. Dále bude uvedena QGP a efekty stínění. Podrobněji budou rozebrány efekty produkce těžkých kvarků, především studené jaderné hmoty. Na závěr příspěvku budou shrnuty dosavadní výsledky na experimentech STAR, CMS a ALICE.
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Matěj Vaculčiak (CTU FNSPE)16/01/2018, 09:15
In my thesis, I go in for a detector optimisation using mainly the Geant4 toolkit and Allpix-squared, a new Geant4-based program which is currently being developed in collaboration with CERN facility. In particular, I focus on radiation resistible semiconductor monolithic pixel detectors used in space dosimetry.
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Tadeáš Kmenta16/01/2018, 09:30
Monte Carlo simulation using FLUKA code for dose distribution is presented and discussed. Dose distribution was scored in water phantom block produced by photon, electron, proton and carbon ion pencil beams for various energies using 1 million primary particles for 5 cycles. A comparison and analysis of particles contributing to the total dose deposited is given as well as the dose shapes.
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Jakub Kubát (ČVUT FJFI)16/01/2018, 09:45
Na urychlovačích LHC v ženevském CERNu a RHIC v americké BNL jsme dnes schopni dosahovat energií, které nám umožňují simulovat podmínky na úplném počátku vesmíru. V jádro-jaderných srážkách zkoumáme fázi hmoty, ve které se barevně nabité kvarky a gluony pohybují v nevázaných stavech. Toto extrémně horké médium nazýváme kvark-gluonové plazma (QGP) a pomocí četných experimentálních metod...
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Martin Klíštinec (CTU FNSPE)16/01/2018, 10:15
In this thesis i am focusing on measuring the propheties of quark-gluon plasma via suppresion of mezon $\Upsilon$. This thesis also contains information about basic propheties of quark-gluon plasma and efects that cause suppresion or enhancement of mezon $\Upsilon$.
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Anežka Kabátová (CTU FNSPE)16/01/2018, 10:30
The subject of my thesis is space radiation detection using semiconductor detectors.
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Firstly, simulation of detector response in Geant4 - Monte Carlo based software toolkit is involved. Later, test measurement is carried out on Tandetron accelerator in Řež. -
Tomáš Truhlář (CTU FNSPE)16/01/2018, 10:45
The subject of my thesis is optimalization of charm hadrons reconstruction especially in d/p+Au collisions using multivariate data analysis.
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The first part of my talk is about the The Toolkit for Multivariate Data Analysis with ROOT (TMVA) itself. Then its importance is demonstrated on some examples in HEP. And in the end, results gained by using TMVA are compared with results from classical analysis. -
Gitika Bhalla (CTU FNSPE)16/01/2018, 11:15
A summary of several papers on the coherent $\rho^0$ photoproduction in ultra-peripheral heavy ion collisions and the comparison of their findings along with model comparisons. 4 papers by the STAR collaboration reporting on Au-Au collisions at $\sqrt{S_{NN}}=130$ GeV, $\sqrt{S_{NN}}=200$ GeV, $\sqrt{S_{NN}}=62.4$ GeV, and one by the ALICE collaboration reporting on Pb-Pb collisions at...
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Ekaterina Eremenko (CTU FNSPE)16/01/2018, 11:30
Laser based acceleration technology allows to produce high electric fields with a centimeter-scale device. The basic physics of Laser Wakefield Acceleration is introduced. To get stable mono-energetic electron beam, particles should be firstly injected into the plasma wave. Different types of electron injection are reviewed. The experimental techniques for density measurement above the...
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Mr Tomáš Novák (Bachelor student)16/01/2018, 11:45
Presenting microscopic quantum hardware generators of coincidence events. Generators evenly gathering data sets of measured coincident quantum based variable. Evolution of such variable is examined by the tools of the TISEAN software package exploiting the approach of non-linear times series analysis.
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Ms Elisabeth Andriantsarazo16/01/2018, 15:20
Kvantová fyzika rozšiřuje způsoby, jak lze manipulovat s informací. Jedna z vlastností, která nemá v klasické fyzice analogii, a kterou tudíž nelze při práci s informací v klasických systémech využít, je kvantové provázání. Tuto vlastnost lze chápat jako určitý druh korelace mezi komponentami fyzikálního systému. Míra této korelace však není v klasických fyzikálních systémech dosažitelná. Za...
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Peter Pribeli (FJFI)16/01/2018, 15:40
The aim of this work is to explore the properties of hard processes in QCD which occur during high energy pp collisions. Subsequently the analysis of the ALICE data of inclusive charged jet $p_T$ spectra is presented. The correction of the data on various detector effects is realized. Finally, systematic uncertainties are estimated and the results compared with the Monte Carlo generator PYTHIA.
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Vladimír Žitka (České vysoké učení technické v Praze)16/01/2018, 16:10
Ve své prezentaci se zmíním o vlivu hodnoty konstanty silné interakce na tvar spekter pozorovatelných veličin při studování vlastností protonových srážek, ve kterých se produkuje dva a více částicových spršek. Ukážu jak se tyto spektra pozorovatelných mění s hodnotou konstanty na příkladu simulovaných dat.
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Robert Líčeník (CTU FNSPE)16/01/2018, 16:50
Charmed mesons serve as an excellent probe in the strongly interacting medium created during heavy ion collisions. This medium is called the quark-gluon plasma and it is an object of great interest due to its connection to the early stages of the Universe. The charmed mesons, such as the D$^\pm$, are created during the hard scattering part of the collision and therefore experience the entire...
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Zuzana Gajdošová (CTU FNSPE)16/01/2018, 17:10
One of the open questions in QCD today is the cause of the shadowing phenomenon
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in nuclei. To understand this phenomenon it is necessary to study gluon distributions in
nuclei at small x. There are several models trying to describe such phenomenon in QCD
which have to be experimentally scrutinised and confirmed. One of the suitable processes
to investigate gluon distributions in nuclei is the... -
Alena Zemanová (České vysoké učení technické v Praze)16/01/2018, 17:30
Rydbergovské atomy jsou takové atomy, jejichž alespoň jeden elektron je excitován do vysokého kvantového stavu. Jejich doba života je extrémně dlouhá a vzhledem k tomu, že mají velký dipólový moment, jsou extrémně citlivé na působení externího pole, což se využívá především při manipulaci v takových polích. Experiment AEgIS, jemuž se věnuje první část práce, se v současné době zabývá výrobou...
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Miroslav Myška (CTU FNSPE)16/01/2018, 19:00
co se do dějin fyziky nevešlo aneb jediná srozumitelná prezentace :)
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Jan Pokorný (CTU FNSPE)18/01/2018, 09:00
We discuss the coupling of the $\Lambda$ particle to the atomic nucleus in the mean-field approximation. The mean field is constructed by the Hartree-Fock (HF) method. We develop a formalism of the HF method including the three-body NNN and $\Lambda$NN interactions. The HF basis is used as a starting point for the Tamm-Dancoff Approximation (TDA). We present a generalization of the TDA that...
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Jakub Cimerman (České vysoké učení technické v Praze)18/01/2018, 09:30
In the first part of the talk we shall investigate how the averaging
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over a large number of events influences the shape of the observed
correlation function. We demonstrate that a shape characterised by Levy
distribution may result from an average over Gaussian sources with
varying sizes and orientations. We then propose to sort the events
according to their similarity and investigate... -
Radka Sochorová (CTU FNSPE )18/01/2018, 10:15Presentation
With the help of a master equation we study the evolution of the multiplicity distribution. Particularly we focus on the third and fourth factorial moments from which all other kinds of moments can be calculated.We first study how the third and the fourth moments thermalise when the kinetic temperature is fixed. Then we study the evolution of the moments in a situation with decreasing...
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Josef Uchytil (CTU FNSPE)18/01/2018, 10:45
The number of particles produced in ultra-relativistic nucleus-nucleus collisions is well described by the statistical model. In this model, the particle yields depend on temperature and chemical potential. However, statistical physics can also predict multiplicity fluctuations, which can subsequently be compared to experimental data. Our primary aim research is to provide information on how...
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Lukáš Holub (CTU FNSPE)18/01/2018, 11:30
In my presentation, I will present a preliminary analysis of correlation femtoscopy measurements of two positive and negative charged pions at small relative momenta, using STAR data from p−Au collisions at $\sqrt{sNN}$ = 200 GeV. The correlation includes Bose-Einstein and Coulomb interaction. The strong interaction is not included here because it is not relevant.
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Obtained correlation... -
Zuzana Moravcová (CTU FNSPE)18/01/2018, 14:15
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Zuzana Moravcová (CTU FNSPE)18/01/2018, 15:35
Measurements of open heavy flavour mesons can be used to study the proprieties of the, so called, quark-gluon plasma produced in heavy-ion (A+A) collisions. The STAR collaboration searches for differences in particle production between the A+A and p+p collisions via the nuclear modification factor. In the low-pt region, ${\rm D^{\pm}}$ mesons cannot be directly reconstructed with traditional...
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Jan Vaněk18/01/2018, 15:55
Měřením produkce mezonů D$^{\pm}$ v ultra-relativistických jádro-jádrových srážkách se studují vlastnosti kvark-glounového plazmatu (QGP). Půvabné kvarky v těchto mezonech totiž vznikají ještě před zažehnutím QGP v tzv. tvrdých procesech a musí tedy projít část objemu QGP, kde ztratí část své hybnosti a energie. Tyto ztráty lze kvantifikovat srovnáním produkce D$^{\pm}$ v jádro-jádrových a...
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Oliver Matonoha (CTU FNSPE)18/01/2018, 16:50
In this presentation, we will give an introduction to the physics of heavy quarkonia in ultra-relativistic collisions of heavy nuclei. Different production-affecting phenomena will be overviewed and juxtaposed with experimental results of related observables. Furthermore, we will present recent measurements of the $\Upsilon$ production in Au+Au collisions at $\sqrt{s_\mathrm{NN}}=200$~GeV via...
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Miroslav Šimko (CTU FNSPE)18/01/2018, 17:20
$\Lambda_\mathrm{c}$ is the lightest baryon containing a charm quark and, as such, presents a unique probe into the bahavior of heavy quarks in the hot and dense QCD medium. Together with the measurement of the D$^0$ meson, we can probe the various modes of hadronization of the charm quark in heavy-ion collisions and bring more insight into the possible process of quark coalescense in the...
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Alena Bakalová (CTU FNSPE)19/01/2018, 11:30
Cosmic ray particles undergo many changes during their propagation through the Universe including energy losses due to interactions with CMB or deflections in both galactic and extragalactic magnetic fields. Such effects make it much more difficult to identify some general cosmic ray properties and their original source. Results concerning the slope of the end of the cosmic ray energy spectrum...
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Šimon Novák19/01/2018, 12:00
Ultra high-energy cosmic ray showers (UHERCs) are being detected at the Pierre Auger Observatory (PAO) in Argentina. Calorimetric energy measured by fluorescence detectors does not represent the total energy of a shower. The part of shower energy called missing energy is carried away undetected mainly by muons and neutrinos. Monte Carlo simulations of UHERCs in CONEX and Corsika programs with...
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Tomáš Jakoubek (České vysoké učení technické v Praze)19/01/2018, 13:30
The talk will give an overview of recent $B$-physics measurements at the ATLAS experiment, with a focus on the $CP$ violation in $B^0_s \rightarrow J/\psi(\mu^+\mu^−)\phi(K^+K^−)$ decay channel. In the Standard Model $CP$ violation is described by a phase in the CKM matrix. One of the manifestations of this complex phase is a phase shift between direct and mixing-mediated $B_s$ decays...
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Lukáš Novotný (CTU FNSPE)19/01/2018, 14:40
Complex phase in the CKM matrix describing quark mixing causes CP violation and can be studied in the decay $B^0_s \rightarrow J/\psi + \phi$. The determination of the initial flavour of neutral $B$ mesons can be inferred using information from the $B$ meson containing other pair-produced b-quark, reffered as opposite-side tagging. To study and calibrate the opposite-side tagging method,...
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Radek Novotný (CTU FNSPE)19/01/2018, 15:10
Last year, the D0 experiment announced the observation of narrow structure X(5568) in decay of B_s + \pi with almost 5 \sigma significance. This structure is investigated by the B-Physics Working group based on a data sample recorded with the ATLAS detector corresponding to 4.9 \fb^{-1} of pp collision data at 7 TeV and 19.5 \fb^{-1} at 8 TeV.
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Ondřej Penc (České vysoké učení technické v Praze)19/01/2018, 16:05
Evidence of the vector boson scattering (VBS) phenomena was discovered in Run 1
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of the ATLAS detector at the LHC in the same sign WW production channel. Since
the detector acquire more and more data in Run 2, the phenomena starts to be
accessible also in the ZZ channel. This channel is very clean because of the
small background other than comming from QCD and provides a good opportunity... -
Ota Zaplatílek (CTU FNSPE)19/01/2018, 16:45
Currently large $t\bar{t}$ production at the LHC allows detail study of the top quark, $t\bar{t}$quark pairs. The talk will instrodude the results of the analysis interested with the measurement of differential cross-section of high boosted $t$ quark and $t \bar{t}$ pairs as a function of various kinematic observables. Study is performed on the full datasets collected by the ATLAS detector at...
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Tomáš Herman (CTU FNSPE)
The exclusive photoproduction of a $J/\Psi$ allows us to examine the transverse distribution of matter inside proton or nucleus targets. Moreover, this photoproduction is a great tool to explore the phenomenon of saturation and nuclear shadowing in the region of low $x$. From QED calculations and models describing the QCD part of the interaction it is possible to calculate the cross section...
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Hana Hrubešová (CTU FNSPE)
Significant amount of antimatter studies has been build on making a comparison between the (physical) properties of particle and antiparticle. As a natural candidate for testing this symetry is a hydrogen-antihydrogen system.Because of long studied and a well-known hydrogen atom, the antihydrogen is an ideal candidate for experimental studying of antimatter. To perform the same precision...
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