Elastic Z⁰ production at HERA

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• 作者：L. Stanco ; on behalf of the ZEUS Collaboration
• 关键词：e&ndash ; p interactions ; Z0Z0 boson
• 刊名：Nuclear and Particle Physics Proceedings
• 出版年：2016
• 出版时间：April-June 2016
• 年：2016
• 卷：273-275
• 期：Complete
• 页码：2165-2170
• 全文大小：282 K

文摘

The production of w the MathML source">Z⁰ bosons in the reaction w the MathML source">ep→eZ⁰p^(⁎), where w the MathML source">p^(⁎) stands for a proton or a low-mass nucleon resonance, has been studied in ep collisions at HERA using the ZEUS detector. The analysis is based on a data sample collected between 1996 and 2007, amounting to 496 pb^-1 of integrated luminosity. The w the MathML source">Z⁰ was measured in the hadronic decay mode. The elasticity of the events was ensured by a cut on w the MathML source">η_max<3.0, where w the MathML source">η_max is the maximum pseudorapidity of energy deposits in the calorimeter defined with respect to the proton beam direction. A signal was observed at the w the MathML source">Z⁰ mass. The cross section of the reaction w the MathML source">ep→eZ⁰p^(⁎) was measured to be w the MathML source">σ(ep→eZ⁰p^(⁎))=0.13±0.06(stat.)±0.01(syst.) pb, in agreement with the Standard Model prediction of 0.16 pb. This is the first measurement of w the MathML source">Z⁰ production in ep collisions. In this paper we report the already published ZEUS result by adding the sensitivities of the most recent similar results from CMS and ATLAS.