Study of the doubly charged Higgs boson single production using lepton parton distribution functions with the ATLAS detector
(2022) FYSM60 20212Particle and nuclear physics
Department of Physics
- Abstract
- Searches for the doubly charged Higgs(H±±) aim to find evidence for models that could explain the origin of neutrino masses. Earlier searches at the LHC have used different production processes for the H±±, with the recent development of lepton parton distribution functions new leptonic production processes are able to be studied. In this thesis the single production process l± + l± → H±± has been studied together with its subsequent decay back into charged leptons. The final state of two prompt and isolated same-sign charged leptons is rare at the LHC and is therefore a powerful probe that this thesis will focus on. The triggering, reconstruction and selection of charged leptons at ATLAS Run 2 have been analyzed to give a final estimate... (More)
- Searches for the doubly charged Higgs(H±±) aim to find evidence for models that could explain the origin of neutrino masses. Earlier searches at the LHC have used different production processes for the H±±, with the recent development of lepton parton distribution functions new leptonic production processes are able to be studied. In this thesis the single production process l± + l± → H±± has been studied together with its subsequent decay back into charged leptons. The final state of two prompt and isolated same-sign charged leptons is rare at the LHC and is therefore a powerful probe that this thesis will focus on. The triggering, reconstruction and selection of charged leptons at ATLAS Run 2 have been analyzed to give a final estimate of the number of events that could be detected at Run 2, 3 and 4. The final events dependence on model parameters have also been investigated with large differences in cross section. Finally, several improvements to be made for a full analysis is discussed. (Less)
- Popular Abstract
- Long has humanity questioned what the basic building blocks of the Universe are. The
idea of the atom started with ancient Greek philosophers but it was not until the late 21st century that the field of particle physics fully emerged. Throughout the last 70 years progress has quickly been made through the discovering of fundamental particles and developing theories describing them which all have led to the creation of the Standard Model. The Standard Model explains what we know about the fundamental components of matter in the Universe and how they interact with each other. This model has been highly successful but still there are questions that it can not explain.
In 2012 the latest particle, the Higgs Boson, was discovered with the... (More) - Long has humanity questioned what the basic building blocks of the Universe are. The
idea of the atom started with ancient Greek philosophers but it was not until the late 21st century that the field of particle physics fully emerged. Throughout the last 70 years progress has quickly been made through the discovering of fundamental particles and developing theories describing them which all have led to the creation of the Standard Model. The Standard Model explains what we know about the fundamental components of matter in the Universe and how they interact with each other. This model has been highly successful but still there are questions that it can not explain.
In 2012 the latest particle, the Higgs Boson, was discovered with the ATLAS detector at the Large Hadron Collider(LHC) located at CERN. This particle is the source of the mass of the particles within the Standard Model, expect for one type of particle: the neutrino. Several other models try to explain the origin of the mass for the neutrino and some of these model theorize a new particle called the
doubly charged higgs which this thesis have studied. The doubly charged higgs is introduced similarly to the Higgs Boson to the Standard Model but the doubly charged higgs has two electrical charges. The decay of this particle is therefore special as it might potentially be the only doubly charged particle in the Standard Model.
The Large Hadron Collider accelerates and collide protons in a 27 km circumference tunnel to probe potential extensions of the Standard Model. When the protons collide they create a firework of different fundamental particles that is measured in detectors covering as much as possible around the collision. One of these detector is the ATLAS detector which together with CMS made the discovery of the Higgs Boson in 2012. In figure 1 one can see an event display showing the chaotic environment
inside one event within the detector. This particular figure is from a potential Z → µµ event which is similar to how doubly charged higgs events would look.
In this thesis the number of events of the doubly charged higgs that would be observable at the ATLAS detector have been investigated. In particular a new production mechanism of this particle involving leptons created within the proton have been studied. This production process could enable a cleaner signal to search for with the ATLAS detector. The results of the study have shown that events of this
process could be detected at ATLAS but that it is highly dependent on parameters within the model and potential background processes that drown out the signal. For certain model values this process could compete with previously analyzed processes. This thesis has built a foundation for the potential of a future full analysis of this production process. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9092111
- author
- Magdalinski, Daniel LU
- supervisor
-
- Else Lytken LU
- organization
- course
- FYSM60 20212
- year
- 2022
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- doubly charged Higgs boson, ATLAS, lepton parton distribution function, same-sign, dilepton, beyond standard model, LHC
- language
- English
- id
- 9092111
- date added to LUP
- 2022-06-22 12:33:18
- date last changed
- 2022-06-22 12:33:18
@misc{9092111,
abstract = {{Searches for the doubly charged Higgs(H±±) aim to find evidence for models that could explain the origin of neutrino masses. Earlier searches at the LHC have used different production processes for the H±±, with the recent development of lepton parton distribution functions new leptonic production processes are able to be studied. In this thesis the single production process l± + l± → H±± has been studied together with its subsequent decay back into charged leptons. The final state of two prompt and isolated same-sign charged leptons is rare at the LHC and is therefore a powerful probe that this thesis will focus on. The triggering, reconstruction and selection of charged leptons at ATLAS Run 2 have been analyzed to give a final estimate of the number of events that could be detected at Run 2, 3 and 4. The final events dependence on model parameters have also been investigated with large differences in cross section. Finally, several improvements to be made for a full analysis is discussed.}},
author = {{Magdalinski, Daniel}},
language = {{eng}},
note = {{Student Paper}},
title = {{Study of the doubly charged Higgs boson single production using lepton parton distribution functions with the ATLAS detector}},
year = {{2022}},
}