Unit:
Κατεύθυνση Πυρηνική Φυσική και Φυσική Στοιχειωδών Σωματιδίων (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Author:
Χειλαδάκης Ευτύχιος
Supervisors info:
Μαρία Βασιλείου Αναπλ. Καθηγ.,(Επιβλέπουσα), Εμ. Φλωράτος Καθηγ., Δ. Φασουλιώτης Επίκ. Καθηγ.
Original Title:
Ταυτοποίηση φορτισμένων πιονίων μέσω των ασθενών τους διασπάσεων και εφαρμογή της μεθόδου στην παραγωγή συντονισμών από αλληλεπιδράσεις pp ( ?s = 7TeV ) στο πείραμα ALICE
Translated title:
Charged pion identification through their weak decays and use of the method in order to study resonances using data from pp (?s=7TeV) from ALICE experiment
Summary:
The object of this thesis is the identification of charged pions via their weak
decay kink
topology in the TPC detector of the ALICE experiment at the LHC at CERN, and
the application
of the method in order to study resonanses. The data used in this thesis where
from pp collisions
at 7 TeV.Pion decays are recorded as secondary vertexes, where a characteristic
break of a track appearswhen a charged mother particle decays in a daughter
particle of the same charge and one or moreneutral 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
species. The identification
is done in a track-by-track level in the whole transverse momentum range. The
method completes
and expands the detectors’ particle identification capabilities.
In this thesis the spectra of the identified charged pions 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 analyzed in the same way.
Then the resonanses K*(892) and phi (1020) are studied, since they mainly
decay in pions and
kaons. Specifically their masses, widths and corrected spectra are
calculated as a function of transverse momentum .
Keywords:
Resonances, Pions, Kink, ALICE experiment, Identification
