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

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题名:	Search for resonances in the dilepton mass distribution in pp collisions at root s=7 TeV
作者:	Chatrchyan,S;Khachatryan,V;Sirunyan,AM;Tumasyan,A;Adam,W;Bergauer,T;Dragicevic,M;Ero,J;Fabjan,C;Friedl,M;Fruhwirth,R;...etc.
贡献者:	物理學系
关键词:	FERMION-PAIR PRODUCTION;E(+)E(-) COLLISIONS;STANDARD MODEL;LEP;CONSTRAINTS;PHYSICS;HADRON
日期:	2011
上传时间:	2012-06-11 10:54:00 (UTC+8)
出版者:	國立中央大學
摘要:	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.
關聯:	JOURNAL OF HIGH ENERGY PHYSICS
显示于类别:	[物理學系] 期刊論文

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