Mass and spin determination of new particles at hadron collider using $M_{T2}$ and on-shell reconstruction = 강입자 충돌기에서 $M_{T2}$ 와 on-shell 재구성을 이용한 새로운 입자의 질량과 스핀 결정

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If new physics signals are discovered in collider experiments then it will be crucial to determine the mass and spin of new particles to demonstrate that they are indeed the predicted new physics. A wide class of new physics that provides a candidate of dark matter often preserves a discrete $Z_2$ symmetry, which results in a certain type of event topology in the experiment. We give a brief survey of the new physics scenarios which were motivated by solving the hierarchy problem, and typical collider signature of them. We then introduce the methods of mass measurement at hadron collider, and discuss the $\It{M_{T2}}$-kink method to determine the masses of both the dark matter WIMP, and its parent particle. To provide kinematic variables useful for the determination of new particle properties, we propose a scheme to assign a systematic approximation of four-momentum to each WIMP in the generic new physics processes. This $\It{M_{T2}}$-assisted on-shell (MAOS) reconstruction of missing momenta can be applied to the spin determination, which is vital to discriminate among different classes of models. As an application of MAOS momentum to the mass measurement, we examine the possibility to determine the standard model Higgs boson mass by constructing the MAOS Higgs mass.
Advisors
Choi, Ki-Woonresearcher최기운researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
418647/325007  / 020037275
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2010.2, [ viii, 111 p. ]

Keywords

new physics beyond the standard model; collider physics; high energy physics; particle physics; LHC; 거대 강입자 충돌기; 새로운 표준모형; 충돌기 물리; 고에너지물리; 입자물리

URI
http://hdl.handle.net/10203/47641
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=418647&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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