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Ω- Yields in pp Events at √s = 13 TeV Using the ALICE Detector

Pålsson, Henrik LU (2021) FYSK02 20202
Particle Physics
Department of Physics
Abstract
Ω- is a baryon which is rarely produced in proton collisions. The theoretical models for how these Ω- appear are yet not fully developed. Previous studies have shown that the experimental data did not agree with the models since more Ω- particles appeared in the proton collisions than expected. In the LHC (Large Hadron Collider) outside Geneva, protons are accelerated to high energies and collided. The products from the collision are analyzed in the ALICE (A Large Ion Collider Experiment). The Ω- yield is extracted by multiple methods, including side-band subtractions and peak fitting. When plotting the ratio of Ω- yields divided by the reconstructed charged multiplicity, the ratio shows an increase in Ω- yields much faster than the... (More)
Ω- is a baryon which is rarely produced in proton collisions. The theoretical models for how these Ω- appear are yet not fully developed. Previous studies have shown that the experimental data did not agree with the models since more Ω- particles appeared in the proton collisions than expected. In the LHC (Large Hadron Collider) outside Geneva, protons are accelerated to high energies and collided. The products from the collision are analyzed in the ALICE (A Large Ion Collider Experiment). The Ω- yield is extracted by multiple methods, including side-band subtractions and peak fitting. When plotting the ratio of Ω- yields divided by the reconstructed charged multiplicity, the ratio shows an increase in Ω- yields much faster than the increase in average charged multiplicity. (Less)
Popular Abstract (Swedish)
Vid partikelacceleratorn LHC pågår ett flertal experiment. Ett av dem är ALICE-experimentet där atomkärnor kollideras. När atomkärnor slås sönder bildas ett plasma av kvarkar och gluoner. I detta kvark–gluonplasma skapas bland annat nya exotiska kvarkar. En av dessa mer exotiska kvarkar är särkvarken. När tre stycken särkvarkar förenas så bildar de en Omega-partikel. Omegan sönderfaller i sin tur till andra partiklar, som i slutändan övergår till vanlig materia. Tidigare studier har visat att fler Omega bildades, än förväntat vid kollisioner mellan atomkärnor av väte. Detta arbete analyserar ny data från ALICE-experimentet tagna vid högre energinivåer än tidigare. Resultatet liknar det som observerats tidigare vid lägre energier.... (More)
Vid partikelacceleratorn LHC pågår ett flertal experiment. Ett av dem är ALICE-experimentet där atomkärnor kollideras. När atomkärnor slås sönder bildas ett plasma av kvarkar och gluoner. I detta kvark–gluonplasma skapas bland annat nya exotiska kvarkar. En av dessa mer exotiska kvarkar är särkvarken. När tre stycken särkvarkar förenas så bildar de en Omega-partikel. Omegan sönderfaller i sin tur till andra partiklar, som i slutändan övergår till vanlig materia. Tidigare studier har visat att fler Omega bildades, än förväntat vid kollisioner mellan atomkärnor av väte. Detta arbete analyserar ny data från ALICE-experimentet tagna vid högre energinivåer än tidigare. Resultatet liknar det som observerats tidigare vid lägre energier. Förhållandet mellan Omega och laddade partiklar ökar desto mer laddade partiklar som observeras. Ökningen av Omega visar att de teoretiska modellerna behöver modifieras. Djupare analyser av kollisionerna behövs också för att förstå den bakomliggande fysiken. (Less)
Please use this url to cite or link to this publication:
author
Pålsson, Henrik LU
supervisor
organization
course
FYSK02 20202
year
type
M2 - Bachelor Degree
subject
keywords
LHC, ALICE, strangeness enhancement, charged multiplicity
language
English
id
9038025
date added to LUP
2021-01-26 09:19:16
date last changed
2021-01-26 09:19:16
@misc{9038025,
  abstract     = {{Ω- is a baryon which is rarely produced in proton collisions. The theoretical models for how these Ω- appear are yet not fully developed. Previous studies have shown that the experimental data did not agree with the models since more Ω- particles appeared in the proton collisions than expected. In the LHC (Large Hadron Collider) outside Geneva, protons are accelerated to high energies and collided. The products from the collision are analyzed in the ALICE (A Large Ion Collider Experiment). The Ω- yield is extracted by multiple methods, including side-band subtractions and peak fitting. When plotting the ratio of Ω- yields divided by the reconstructed charged multiplicity, the ratio shows an increase in Ω- yields much faster than the increase in average charged multiplicity.}},
  author       = {{Pålsson, Henrik}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Ω- Yields in pp Events at √s = 13 TeV Using the ALICE Detector}},
  year         = {{2021}},
}