Search and measurement of new physics behind missing energy at LHC거대강입자충돌기에서 없어진 에너지를 통한 새물리 관측 및 측정

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Missing energy is one of the key signature at the Large Hadron Collider for observing new physics motivated from dark matter. For example, in the weak scale supersymmetric model, the superpartners are pair produced and decaying semi-invisibly because of R-parity which is necessary in order to stabilize the lightest supersymmetric particle, which is a dark matter candidate. Inspired from those models, we particularly investigated two channels: pair production of new particle decaying semi-invisibly, and heavy resonance production decaying into two Z bosons. These two channels are highly motivated channel for the discovery of new particles. In order to identify properties of new particle in a model independent way, we need to use all the kinematic information available within the events as much as possible. To achieve this, we developed two method. For pair production of new particle decaying semi-invisibly, we developed minimized power mean, which is a smooth generalization of $M_{T2}$. While $M_{T2}$ variable has an intrinsic prejudice that two particles have degenerated mass spectrum, our new variable can justify this assumption from experimental data. We can identify the mass spectrum by investigating the kinematic endpoint of the minimized power mean. For heavy resonance production decaying into two Z bosons, we deployed jet substructure techniques and matrix element method. Analysis for distinguishing quantum state of the intermediate resonance often becomes most sensitive when two fermions from a Z boson lies within a smaller angular scale. Jet substructure techniques can be used for resolving the large cluster originated from the two colored fermions. With the aid of matrix element method, this jet substructure technique can be a very powerful tool for identifying the quantum state of the heavy resonance.
Advisors
K. Semertzidis, Yannisresearcher야니스researcher
Description
한국과학기술원 :물리학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2017.2,[vii, 84 p. :]

Keywords

Large Hadron Collider; collider phenomenlogy; beyond the Standard Model; missing transverse energy; jets; 거대강입자충돌기; 가속기 현상론; 표준모형의 확장; 잃은 에너지; 제트

URI
http://hdl.handle.net/10203/241773
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675685&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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