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R-hadron Searches and Charged Pion Spectra at High Transverse Momentum in Proton-Proton Collisions at the LHC using the ALICE Detector

Dobrin, Alexandru LU (2010)
Abstract
With the start-up of the Large Hadron Collider (LHC), a new energy regime has opened up. The Standard Model (SM) can be ``rediscovered'' and new theories can be tested. ALICE, the dedicated heavy-ion experiment at LHC, will also record proton-proton (pp) collisions.



Even though the main goal of the ALICE proton program is to provide the baseline measurements for interpreting the heavy-ion data, the new heavy stable charged particles ($m>100$~GeV/c$^2$) predicted by some theoretical models, such as R-hadrons in Supersymmetry, are good candidates of ALICE searches for signals beyond the SM. Gluino R-hadron is chosen as an example of a candidate in this thesis, and cross sections and kinematic properties are obtained... (More)
With the start-up of the Large Hadron Collider (LHC), a new energy regime has opened up. The Standard Model (SM) can be ``rediscovered'' and new theories can be tested. ALICE, the dedicated heavy-ion experiment at LHC, will also record proton-proton (pp) collisions.



Even though the main goal of the ALICE proton program is to provide the baseline measurements for interpreting the heavy-ion data, the new heavy stable charged particles ($m>100$~GeV/c$^2$) predicted by some theoretical models, such as R-hadrons in Supersymmetry, are good candidates of ALICE searches for signals beyond the SM. Gluino R-hadron is chosen as an example of a candidate in this thesis, and cross sections and kinematic properties are obtained from PYTHIA simulations for various gluino masses (100-500 GeV/c$^2$). Detailed detector response simulations of the most important signatures for R-hadron identification in the ALICE central barrel are performed for 100 GeV/c$^2$ R-hadron mass. No evidence of particles that pass the R-hadron selection criteria in the Inner Tracking System, Time Projection Chamber (TPC), and the Time-of-Flight detectors can be observed in around 27.5 million pp events at $\sqrt{s}=7$ TeV (the maximum energy available for the first two years of the LHC operation).



First steps towards identified charged particle spectra at intermediate and high transverse momentum ($p_T$) using the TPC specific ionization energy loss are also taken here. The first charged pion spectra at high $p_T$ in inelastic pp collisions at $\sqrt{s}=900$ GeV and $\sqrt{s}=7$ TeV by the ALICE experiment at the LHC are presented in this thesis. (Less)
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author
supervisor
opponent
  • Prof. Cole, Brian A., Columbia University
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Fysicumarkivet A:2010:Dobrin
pages
199 pages
defense location
Salle B
defense date
2010-10-15 10:15
ISBN
978-91-7473-029-6
language
English
LU publication?
yes
id
6839fe47-77c7-4e87-9f49-3eb2c23c1d4b (old id 1669800)
date added to LUP
2010-09-10 13:35:18
date last changed
2016-09-19 08:45:16
@misc{6839fe47-77c7-4e87-9f49-3eb2c23c1d4b,
  abstract     = {With the start-up of the Large Hadron Collider (LHC), a new energy regime has opened up. The Standard Model (SM) can be ``rediscovered'' and new theories can be tested. ALICE, the dedicated heavy-ion experiment at LHC, will also record proton-proton (pp) collisions. <br/><br>
<br/><br>
Even though the main goal of the ALICE proton program is to provide the baseline measurements for interpreting the heavy-ion data, the new heavy stable charged particles ($m&gt;100$~GeV/c$^2$) predicted by some theoretical models, such as R-hadrons in Supersymmetry, are good candidates of ALICE searches for signals beyond the SM. Gluino R-hadron is chosen as an example of a candidate in this thesis, and cross sections and kinematic properties are obtained from PYTHIA simulations for various gluino masses (100-500 GeV/c$^2$). Detailed detector response simulations of the most important signatures for R-hadron identification in the ALICE central barrel are performed for 100 GeV/c$^2$ R-hadron mass. No evidence of particles that pass the R-hadron selection criteria in the Inner Tracking System, Time Projection Chamber (TPC), and the Time-of-Flight detectors can be observed in around 27.5 million pp events at $\sqrt{s}=7$ TeV (the maximum energy available for the first two years of the LHC operation). <br/><br>
<br/><br>
First steps towards identified charged particle spectra at intermediate and high transverse momentum ($p_T$) using the TPC specific ionization energy loss are also taken here. The first charged pion spectra at high $p_T$ in inelastic pp collisions at $\sqrt{s}=900$ GeV and $\sqrt{s}=7$ TeV by the ALICE experiment at the LHC are presented in this thesis.},
  author       = {Dobrin, Alexandru},
  isbn         = {978-91-7473-029-6},
  keyword      = {Fysicumarkivet A:2010:Dobrin},
  language     = {eng},
  pages        = {199},
  title        = {R-hadron Searches and Charged Pion Spectra at High Transverse Momentum in Proton-Proton Collisions at the LHC using the ALICE Detector},
  year         = {2010},
}