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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Measurement of the Λb baryon mass in the ATLAS experiment
 Macko, Vladimír ; Scheirich, Daniel (advisor) ; Faltová, Jana (referee)
The mass of the Λb baryon has been studied in proton-proton collisions using experimental data from the ATLAS detector at the LHC in CERN. The mass is measured by reconstructing momenta of products in the studied decay. Decay channel Λb → J/ψ(µ+ µ− )Λ(pπ− ) is chosen for the mass reconstruction in this work. The selection criteria are applied in order to minimize background effect and, therefore, obtain the value of the mass of the Λb baryon with the lower statistical error. The systematic error is obtained from a comparison of the three statistical models describing experimental data. The result of measurement of the Λb baryon mass in the ATLAS experiment performed in this work is: mΛb = (5619.1 ± 1.0) MeV. 1
Detailed record
Study of electromagnetic processes in ultra-peripheral collisions of heavy-ions at the Large Hadron Collider
 Váňa, Pavel ; Spousta, Martin (advisor) ; Mlynáriková, Michaela (referee)
This thesis contains a study of electromagnetic processes created in heavy-ion collisi- ons during interaction of electromagnetic fields of nuclei. During these collisions, dimuon pairs are produced via γγ → µ+ µ− processes. Dimuon pairs then penetrate quark gluon plasma created in heavy-ion collisions and their kinematics may be altered by the presence of the plasma. The aim of this thesis is to develop simple geometric model that is then im- plemented and a program for measuring the path length of products of electromagnetic processes is delivered. The simulation of centrality dependent acoplanarity broadening is performed. Centrality dependent acoplanarity broadening of dimuon pairs produced in γγ → µ+ µ− processes was previously measured by the ATLAS detector at the LHC in Pb+Pb collisions at √ sNN = 5.02TeV. It was shown that model can reproduce the dis- tribution of acoplanarity measured by ATLAS for α > 2.10−3 rad when the quadratic configuration of path-length dependence of acoplanarity broadening is used. On the con- trary, measurement of acoplanarity distribution for α < 2.10−3 rad cannot be reproduced by the model. 1
Detailed record
Measurement of the Λb baryon mass in the ATLAS experiment
 Macko, Vladimír ; Scheirich, Daniel (advisor) ; Faltová, Jana (referee)
The mass of the Λb baryon has been studied in proton-proton collisions using experimental data from the ATLAS detector at the LHC in CERN. The mass is measured by reconstructing momenta of products in the studied decay. Decay channel Λb → J/ψ(µ+ µ− )Λ(pπ− ) is chosen for the mass reconstruction in this work. The selection criteria are applied in order to minimize background effect and, therefore, obtain the value of the mass of the Λb baryon with the lower statistical error. The systematic error is obtained from a comparison of the three statistical models describing experimental data. The result of measurement of the Λb baryon mass in the ATLAS experiment performed in this work is: mΛb = (5619.1 ± 1.0) MeV. 1
Detailed record

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