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A search for massive particles decay...

Lee, Lawrence, Jr.

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A search for massive particles decaying into multiple quarks with the ATLAS detector at the LHC.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A search for massive particles decaying into multiple quarks with the ATLAS detector at the LHC./
作者:	Lee, Lawrence, Jr.
面頁冊數:	179 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
Contained By:	Dissertation Abstracts International75-09B(E).
標題:	High energy physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3580746
ISBN:	9781321053852

A search for massive particles decaying into multiple quarks with the ATLAS detector at the LHC.
Lee, Lawrence, Jr.

A search for massive particles decaying into multiple quarks with the ATLAS detector at the LHC. - 179 p.

Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.

Thesis (Ph.D.)--Yale University, 2014.

This item must not be sold to any third party vendors.

A search for new physics phenomena is performed in all-hadronic signatures in sqrt (s) = 8 TeV pp collisions using an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector at the LHC. Specific models are used to concretely interpret these model-independent results. Within the context of sup ersymmetry, gluino pair-production gives rise to a multijet final state in models that allow for violation of R-parity. Two types of spectra are evaluated -- those that have an effective gluino decay to jets and those in which the lightest supersymmetric particle is a neutralino through which a gluino will cascade into a higher jet multiplicity. Events are required to contain a tunable number of jets above a tunable momentum threshold. An additional requirement identifying a certain number of these jets as having originated from a b-quark is applied to probe exclusive flavor coupling hypotheses. A counting experiment is performed and results are presented for all possible R-parity violating branching fractions of gluino decays to various quark flavors. In a model where pair-produced gluinos each decay into three light-flavor quarks, exclusions of m_g&tilde; < 8S3 GeV (expected) and m_g&tilde; < 917 GeV (observed) are placed at the 95% confidence level. Alternately, for a model where each gluino decays into one b-jet and two light quarks, exclusions of m_g&tilde; < 921 GeV (expected) and m_g&tilde; < 929 GeV (observed) are set. Limits are also set for decay modes to a variety of other flavors as well as for decay modes through an intermediary neutralino, which leads to ten-quark final states. All of these results represent the strongest direct limits on such models to date.

ISBN: 9781321053852Subjects--Topical Terms:

2144759
High energy physics.

A search for massive particles decaying into multiple quarks with the ATLAS detector at the LHC.
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502 $a Thesis (Ph.D.)--Yale University, 2014.
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520 $a A search for new physics phenomena is performed in all-hadronic signatures in sqrt (s) = 8 TeV pp collisions using an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector at the LHC. Specific models are used to concretely interpret these model-independent results. Within the context of sup ersymmetry, gluino pair-production gives rise to a multijet final state in models that allow for violation of R-parity. Two types of spectra are evaluated -- those that have an effective gluino decay to jets and those in which the lightest supersymmetric particle is a neutralino through which a gluino will cascade into a higher jet multiplicity. Events are required to contain a tunable number of jets above a tunable momentum threshold. An additional requirement identifying a certain number of these jets as having originated from a b-quark is applied to probe exclusive flavor coupling hypotheses. A counting experiment is performed and results are presented for all possible R-parity violating branching fractions of gluino decays to various quark flavors. In a model where pair-produced gluinos each decay into three light-flavor quarks, exclusions of m_g&tilde; < 8S3 GeV (expected) and m_g&tilde; < 917 GeV (observed) are placed at the 95% confidence level. Alternately, for a model where each gluino decays into one b-jet and two light quarks, exclusions of m_g&tilde; < 921 GeV (expected) and m_g&tilde; < 929 GeV (observed) are set. Limits are also set for decay modes to a variety of other flavors as well as for decay modes through an intermediary neutralino, which leads to ten-quark final states. All of these results represent the strongest direct limits on such models to date.
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