Search for resonances in the dilepton mass distribution in pp collisions at root s=7 TeV

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/53017

Title:	Search for resonances in the dilepton mass distribution in pp collisions at root s=7 TeV
Authors:	Chatrchyan,S;Khachatryan,V;Sirunyan,AM;Tumasyan,A;Adam,W;Bergauer,T;Dragicevic,M;Ero,J;Fabjan,C;Friedl,M;Fruhwirth,R;...etc.
Contributors:	物理學系
Keywords:	FERMION-PAIR PRODUCTION;E(+)E(-) COLLISIONS;STANDARD MODEL;LEP;CONSTRAINTS;PHYSICS;HADRON
Date:	2011
Issue Date:	2012-06-11 10:54:00 (UTC+8)
Publisher:	國立中央大學
Abstract:	A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment at the CERN LHC, using pp collision data recorded at root s = 7 TeV. The event samples correspond to integrated luminosities of 40 pb(-1) in the dimuon channel and 35 pb(-1) in the dielectron channel. Heavy dilepton resonances are predicted in theoretical models with extra gauge bosons (Z') or as Kaluza-Klein graviton excitations (G(KK)) in the Randall-Sundrum model. Upper limits on the inclusive cross section of Z'(GKK) -> l + l(-) relative to Z -> l + l(-) are presented. These limits exclude at 95% confidence level a Z' with standard-model-like couplings below 1140 GeV, the superstring-inspired Z'(psi) below 887 GeV, and, for values of the coupling parameter k/(M) over bar (Pl) of 0.05 (0.1), Kaluza-Klein gravitons below 855 (1079) GeV.
Relation:	JOURNAL OF HIGH ENERGY PHYSICS
Appears in Collections:	[Department of Physics] journal & Dissertation

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