Unit:
Τομέας Πυρηνικής Φυσικής και Φυσικής Στοιχειωδών ΣωματιδίωνLibrary of the School of Science
Author:
Τσουμάκη Παρασκευή
Supervisors info:
Μαρία Βασιλείου Αναπλ. Καθηγ.
Original Title:
Ταυτοποίηση φορτισμένων καονίων μέσω της τοπολογίας των ασθενών τους διασπάσεων στα δεδομένα αλληλεπιδράσεων pp (Sqrt(s) = 7 TeV) του πειράματος ALICE
Summary:
The object of this thesis is the identification of charged kaons via their weak
decay kink
topology in the TPC detector of the ALICE experiment at the LHC at CERN, on pp
collisions
data at 7 TeV.
Kaon decays are recorded as secondary vertexes, where a characteristic break of
a track
appears when a charged mother particle decays in a daughter particle of the
same charge and one
or more neutral particles. The property of charged kaons and pions to decay in
the same pairs
of daughter particles () offers a means for their separation and
identification. The kinematic
variables of the aforementioned topology, i.e. the transverse momentum of the
daughter particle
in its mother’s frame and the kink angle allow sufficient separation of the two
particle spiecies
in an expanded range of transverse momentum from 0.2 GeV/c to 15 GeV/c. The
identification
is done in a track-by-track level in the whole transverse momentum range and
the achieved
purity is better than 97%. The method completes and expands the detectors’
particle identification
capabilities.
In this thesis the spectra of the identified charged kaons as function of
transverse momentum,
pseudorapidity and rapidity are explicitly calculated. The corresponding
correction factors of
geometrical acceptance, efficiency and purity and the systematic errors are
studied as well. For
these purposes, both simulated and real data are analysed in the same way.
The obtained sample of the lightest strange particles can be used for
comparisons with the
predictions of the established models for the strong interacting matter, via
signatures that require
particle identification, in order to verify, alter or reject them. The long
term target is to compare
the obtained sample with the one that will be obtained from Pb-Pb collisions in
order to study
the properties of the quark-gluon plasma that is supposed to be created during
the latter.
Keywords:
Kink, LHC, Alice, kaon, Cern
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