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Probing the Anomalous Top-gluon Coupling at Hadron Colliders
Thesis

Probing the Anomalous Top-gluon Coupling at Hadron Colliders

粟星輔
Masters, 國立清華大學, 物理系
2013

Abstract

對撞機 頂夸克 兆電子伏特加速器 大型強子對撞機 top quark Tevatron LHC CEDM CMDM
Through top quark-pair production at hadron collider, we study the possible effects of nonstandard top-gluon couplings are composed of chromomagnetic dipole moments and chrmoelectric dipole moments, CMDM and CEDM, of top quarks. And using the effective operators, which produces anomalous coupling of top quark to calculate the total cross section for the top-pair production process pp/p¯p → t¯tX. By comparing the latest result of the total cross section at Tevatron and LHC, can us describe these anomalous coupling parameters as an allowed region on the coordinate plane. And we found that there is a common space consist in all the region, which made by different experiment. Next we offer another method to give constraint on nonstandard top-gluon couplings by analysing the different type of asymmetries, and these asymmetries are related to the t¯t spin correlation. Then we compared to the LHC measurement result at 7 TeV to find out the possible values of anomalous top-gluon coupling parameters.

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