Fastlim: a fast LHC limit calculator.

Fastlim: a fast LHC limit calculator.
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DOI:
10.1140/epjc/s10052-014-3163-1
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发表时间:
2014
期刊:
The European physical journal. C, Particles and fields
影响因子:
--
通讯作者:
Zeune L
Zeune L
中科院分区:
其他
文献类型:
--
作者:
Papucci M;Sakurai K;Weiler A;Zeune L

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Fastlim 是一种工具,用于通过直接大型强子对撞机搜索计算标准模型扩展的保守限制,而无需执行任何蒙特卡罗事件生成。该程序根据预先计算的效率表和简化事件拓扑的横截面表重建可见横截面(事件选择切割后的横截面)。作为该方法的概念证明,我们已经实现了与具有 R 宇称守恒的超对称模型相关的搜索。 Fastlim 获取给定模型点的频谱和耦合信息,并为所实施分析的每个信号区域提供标准化为实验报告的相应上限的可见横截面以及值。为了证明该程序的实用性,我们研究了最近 ATLAS 缺失能量搜索对自然 SUSY 模型参数空间的敏感性。该程序结构允许直接包含外部效率表,并且可以推广到违反 R 奇偶校验的场景和非 SUSY 模型。本文作为独立的用户指南,并指出了所使用的约定和近似值。
Fastlim is a tool to calculate conservative limits on extensions of the Standard Model from direct LHC searches without performing any Monte Carlo event generation. The program reconstructs the visible cross sections (cross sections after event selection cuts) from pre-calculated efficiency tables and cross section tables for simplified event topologies. As a proof of concept of the approach, we have implemented searches relevant for supersymmetric models with R-parity conservation. Fastlim takes the spectrum and coupling information of a given model point and provides, for each signal region of the implemented analyses, the visible cross sections normalised to the corresponding upper limit, reported by the experiments, as well as the value. To demonstrate the utility of the program we study the sensitivity of the recent ATLAS missing energy searches to the parameter space of natural SUSY models. The program structure allows the straightforward inclusion of external efficiency tables and can be generalised to R-parity violating scenarios and non-SUSY models. This paper serves as a self-contained user guide and indicates the conventions and approximations used.
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