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Search for new phenomena in low-mass dijet using trigger-level analysis

Nindhito, Herjuno LU (2016) FYSM60 20161
Department of Physics
Particle Physics
Abstract
The recent upgrade of the Large Hadron Collider (LHC) benefits searches for new physics phenomena using multijet final states. The increased center-of-mass energy opens new possibilities to probe new physics at scales beyond the Tera-electron volt (TeV), especially in di-jet final states. However, in the sub-TeV mass region, the QCD background to dijet searches is overwhelming and not all events can be fully recorded. Due to the limited bandwidth available for offline storage, the rates of recording events have to be kept under control. This bandwidth limitation could be addressed by recording partial events, reducing the event size drastically. In order to use these partial events, recorded within the High Level Trigger (HLT) system in a... (More)
The recent upgrade of the Large Hadron Collider (LHC) benefits searches for new physics phenomena using multijet final states. The increased center-of-mass energy opens new possibilities to probe new physics at scales beyond the Tera-electron volt (TeV), especially in di-jet final states. However, in the sub-TeV mass region, the QCD background to dijet searches is overwhelming and not all events can be fully recorded. Due to the limited bandwidth available for offline storage, the rates of recording events have to be kept under control. This bandwidth limitation could be addressed by recording partial events, reducing the event size drastically. In order to use these partial events, recorded within the High Level Trigger (HLT) system in a search for new physics, a new dedicated calibration scheme needs to be developed. This thesis describes the data-driven in-situ pseudorapidity intercalibration for HLT jets that is necessary for such a search. (Less)
Popular Abstract
Ever since the beginning of time, our understanding of the universe is always driven by our curiosity. The Large Hadron Collider (LHC) at CERN is one of the experiments built to answer those questions. LHC is built as 27-kilometers-circumference circular collider who is ready to collide protons or lead ions to mimic the condition of the very first second of our universe. LHC had successfully observed the Higgs boson in 2012 and on course to reveal the secret of unknown phenomena such as dark matter. Dark matter is an unknown matter which fill roughly a quarter of our universe. Many theorists expect dark matter to interact with the visible matter, to explain its abundance in the present universe. An analysis using an object called a jet is... (More)
Ever since the beginning of time, our understanding of the universe is always driven by our curiosity. The Large Hadron Collider (LHC) at CERN is one of the experiments built to answer those questions. LHC is built as 27-kilometers-circumference circular collider who is ready to collide protons or lead ions to mimic the condition of the very first second of our universe. LHC had successfully observed the Higgs boson in 2012 and on course to reveal the secret of unknown phenomena such as dark matter. Dark matter is an unknown matter which fill roughly a quarter of our universe. Many theorists expect dark matter to interact with the visible matter, to explain its abundance in the present universe. An analysis using an object called a jet is performed to find the possible dark matter candidate. This thesis explains about the process of analysis using trigger-level object with focus on a calibration procedure. (Less)
Please use this url to cite or link to this publication:
author
Nindhito, Herjuno LU
supervisor
organization
course
FYSM60 20161
year
type
H2 - Master's Degree (Two Years)
subject
language
English
id
8894189
date added to LUP
2016-10-28 11:07:35
date last changed
2016-11-03 15:52:45
@misc{8894189,
  abstract     = {The recent upgrade of the Large Hadron Collider (LHC) benefits searches for new physics phenomena using multijet final states. The increased center-of-mass energy opens new possibilities to probe new physics at scales beyond the Tera-electron volt (TeV), especially in di-jet final states. However, in the sub-TeV mass region, the QCD background to dijet searches is overwhelming and not all events can be fully recorded. Due to the limited bandwidth available for offline storage, the rates of recording events have to be kept under control. This bandwidth limitation could be addressed by recording partial events, reducing the event size drastically. In order to use these partial events, recorded within the High Level Trigger (HLT) system in a search for new physics, a new dedicated calibration scheme needs to be developed. This thesis describes the data-driven in-situ pseudorapidity intercalibration for HLT jets that is necessary for such a search.},
  author       = {Nindhito, Herjuno},
  language     = {eng},
  note         = {Student Paper},
  title        = {Search for new phenomena in low-mass dijet using trigger-level analysis},
  year         = {2016},
}