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Measurement of the Λb baryon mass in the ATLAS experiment
Thesis title in Czech: Měření hmoty Lambda_b baryonu v experimentu ATLAS
Thesis title in English: Measurement of the Λb baryon mass in the ATLAS experiment
Key words: Lambda-b baryon, ATLAS detector, Velký hadronový urychlovač
English key words: Lambda-b baryon, ATLAS detector, Large Hadron Collider
Academic year of topic announcement: 2013/2014
Thesis type: Bachelor's thesis
Thesis language: angličtina
Department: Institute of Particle and Nuclear Physics (32-UCJF)
Supervisor: Mgr. Daniel Scheirich, Ph.D.
Author: hidden - assigned and confirmed by the Study Dept.
Date of registration: 07.10.2013
Date of assignment: 21.10.2013
Confirmed by Study dept. on: 07.04.2014
Date and time of defence: 17.06.2014 00:00
Date of electronic submission:20.05.2014
Date of submission of printed version:20.05.2014
Date of proceeded defence: 17.06.2014
Opponents: Mgr. Jana Faltová, Ph.D.
The bottom quark (b-quark) is the heaviest quark known to form hadrons, i.e. composite particles formed of quarks bound by a strong force. These b-hadrons are produced in copious quantities at the Large Hadron Collider (LHC) and study of their properties is part of the wide physics program of the ATLAS experiment at the LHC. B-physics, how the field is called, offers a great opportunity to test predictions of the Standard Model of elementary particles but also probes the new physics beyond the Standard Model.

The aim of this Bachelor project is to study the Lambda_b particle, the lightest of the b-baryons (i.e. hadrons consisting of three bound valence quarks, one of them being a b-quark). Since the Lambda_b is lighter than other b-baryons, its production rate is higher and therefore a relatively large data sample containing the Lambda_b candidates has been accumulated already at an early stage of the LHC operation. The student will analyze the available sample of reconstructed Lambda_b decays from the ATLAS experiment and use them to determine the mass of the baryon.

Thesis character:
Experimental, data analysis

Thesis outline:
1/ The student will familiarize himself/herself with the ATLAS experiment
2/ The student will learn selected methods of processing and analysis of data from the ATLAS experiment
3/ The student will gain a basic level of competence using the common software tools for data analysis
4/ The student will apply the learned knowledge and experience to extract the Lambda_b baryon mass from the ATLAS data

Daniel Scheirich, Measurements of Λ and Λb baryon properties in the ATLAS experiment, Dissertation,
Root user's guide,
Root reference guide,
Roofit user's manual:
The ATLAS collaboration, Phys. Rev. D 87, 032002 (2013)
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