Search for narrow resonances in dilepton mass spectra in pp collisions at

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• 作者：CMS Collaboration ; S. Chatrchyan ; V. Khachatryan ; A.M. Sirunyan ; A. Tumasyan ; W. Adam ; T. Bergauer ; M. Dragicevic ; J. Er? ; C. Fabjan ; M. Friedl ; R. Fr¨¹hwirth ; V.M. Ghete ; J. Hammer ; N. H?rmann ; J. Hrubec ; M. Jeitler ; W. Kiesenhofer ; V. Kn¨¹nz ; M. Krammer ; et al.
• 关键词：CMS ; Dileptons ; Resonances
• 刊名：Physics Letters B
• 出版年：2012
• 出版时间：14 August, 2012
• 年：2012
• 卷：714
• 期：2-5
• 页码：158-179
• 全文大小：714 K

文摘

A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 fb^?1. The event yields observed in the signal regions are consistent with predictions of the standard model backgrounds, and upper limits on the cross section times branching fraction for a resonance decaying to dileptons are extracted from a shape analysis of the dilepton invariant mass distribution. The resulting mass limits at 95 % confidence level are 2330 GeV for the in the Sequential Standard Model, 2000 GeV for the superstring-inspired resonance, 890 (540) GeV for the Stueckelberg extension with the mass parameter (0.04), and 2140 (1810) GeV for Kaluza-Klein gravitons with the coupling parameter of 0.10 (0.05). These limits are the most stringent to date.