National Repository of Grey Literature 5 records found  Search took 0.00 seconds. 
Nucleon spin structure studies in Drell-Yan process at Compass
Matoušek, Jan ; Finger, Miroslav (advisor) ; Aschenauer, Elke-Caroline (referee) ; Závada, Petr (referee)
Jointly-supervised doctoral thesis Title: Nucleon spin structure studies in Drell-Yan process at COMPASS Author: Jan Matoušek Department I: Department of Low Temperature Physics, Faculty of Mathem- atics and Physics, Charles University Department II: Department of Physics, University of Trieste Supervisor I: prof. Miroslav Finger (Department I) Supervisor II: prof. Anna Martin (Department II) Abstract: The nucleon structure is presently described by Transverse Momentum Depend- ent (TMD) Parton Distribution Functions (PDFs), which generalise the collinear PDFs, adding partonic spin and transverse momentum degrees of freedom. The recent HERMES and COMPASS data on hadron production in deep inelastic scattering (SIDIS) of leptons off transversely polarised nucleons have provided a decisive validation of this framework. Nevertheless, the TMD PDFs should be studied in complementary reactions, like pp hard scattering and Drell-Yan pro- cesses. In particular the Sivers TMD PDF, which encodes the correlation between the nucleon transverse spin and quark transverse momentum and appears in the Sivers Transverse Spin Asymmetry (TSA), is expected to have opposite sign in Drell-Yan and SIDIS. In 2015 COMPASS measured for the first time the Drell- Yan process on a transversely polarised target π− p↑ → µ− µ+ X to test...
Low temperature polarized target for spin structure studies of nucleons at COMPASS
Pešek, Michael ; Finger, Miroslav (advisor) ; Procházka, Ivan (referee)
Title: Low temperature polarized target for spin structure studies of nucleons at COMPASS Author: Bc. Michael Pešek Department: Department of low temperature physics Supervisor of the master thesis: prof. Ing. Miroslav Finger, DrSc. Abstract: In presented thesis we describe concept of Deep Inelastic Scattering of leptons on nucleons in context of nucleon spin structure studies. Both polarized and unpolarized cases are discussed and concept of Transverse Momentum Dependent Parton Distribution Functions (TMD PDF) is introduced. The possibility of TMDs measurement using Semi-inclusive DIS (SIDIS) is described along with related results from COMPASS experiment. The future Drell-Yan programme at COMPASS is briefly mentioned and its importance is presented on the universality test i.e. change of sign of T-odd TMDs when measured in Drell-Yan and SIDIS. The importance of Polarized Target (PT) for spin structure studies is highlighted and principles of Dynamic Nuclear Polarization (DNP) are given using both Solid effect and spin temperature concept. COMPASS experiment is described in many details with accent given to PT. Finally the thermal equilibrium (TE) calibration procedure is described and carried out for 2010 and 2011 physics runs at COMPASS. The average polarization measurement results from 2010 and 2011 are...
Studies of Drell-Yan process at Compass experiment
Matoušek, Jan ; Finger, Miroslav (advisor) ; Procházka, Ivan (referee)
Hadron structure is not fully understood yet. While the spin-averaged Parton Dis- tribution Functions (PDFs) and the helicity-dependent PDFs are well determined, little is known about the transverzity and some other transverse-momentum de- pendent PDFs (TMDs). The COMPASS experiment at CERN is preparing for studying the TMDs using a Drell-Yan process on transversely polarized target hit by pion beam in 2014-2015. An outline of the parton model of hadrons and of the TMDs is given. The COMPASS spectrometer is described, with emphasis on the modifications for the Drell-Yan program, and its capabilities to measure the TMDs is briefly discussed. A special attention is paid to the polarized target. The dilution refrigerator, the DNP system for polarizing the nuclei and the NMR for polarization measurement are described. The new monitoring system of the refrigerator is described, including the author's contribution to it. Issues of the new NMR coils design are discussed. 1
Low temperature proton polarized target for nucleon structure studies at COMPASS
Pešek, Michael ; Finger, Miroslav (advisor) ; Englich, Jiří (referee)
Title: Low temperature proton polarized target for nucleon structure studies at COMPASS Author: Michael Pešek Department / Institute: Department of Low temperature Physics Supervisor of the bachelor thesis: prof. Ing. Miroslav Finger, DrSc., Department of Low Temperature Physics Abstract: Overview of basics of deep inelastic scattering and process of dynamic nuclear polarization with emphasis to importance of precise polarization determination for nucleon spin structure studies are given. This is followed by description of COMPASS experiment with emphasis given to low temperature polarized target. General procedure of NMR data analysis is given and finally polarization for run 2010 and relaxations rates are determined. Keywords: nucleon structure, polarized proton target, low temperatures, NMR technique
Search for an Axion in OSQAR Experiment at CERN
Husek, Tomáš ; Finger, Miroslav (advisor) ; Šulc, Miroslav (referee)
In the present work, OSQAR experiment at CERN is being introduced. The goal of this rather small experiment is a search for a hypothetical particle called axion, which could play an important role in modern physical theories. It is necessary to say, that the experimental setup as well as particular devices are still being developed or calibrated and measurement modes optimized. That is why desired functionality and reliability of the presently used equipment with a variety of different operating procedures are discussed. Preliminary results, simulations and estimation of sensitivity limitations of the current setup are also presented.

Interested in being notified about new results for this query?
Subscribe to the RSS feed.