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Fittino, a program for determining MSSM parameters from collider observables using an iterative method

机译:Fittino,一种使用迭代方法从对撞机观测值确定MSSM参数的程序

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Provided that Supersymmetry (SUSY) is realized, the Large Hadron Collider (LHC) and the future International Linear Collider (ILC) may provide a wealth of precise data from SUSY processes. An important task will be to extract the Lagrangian parameters. On this basis the goal is to uncover the underlying symmetry breaking mechanism from the measured observables. In order to determine the SUSY parameters, the program Fittino has been developed. It uses an iterative fitting technique and a Simulated Annealing algorithm to determine the SUSY parameters directly from the observables without any a priori knowledge of the parameters, using all available loop-corrections to masses and couplings. Simulated Annealing is implemented as a stable and efficient method for finding the optimal parameter values. The theoretical predictions can be provided from any program with SUSY Les Houches Accord interface. As fit result, a set of parameters including the full error matrix and two-dimensional uncertainty contours are obtained, Pull distributions can automatically be created and allow an independent cross-check of the fit results and possible systematic shifts in the parameter determination. A determination of the importance of the individual observables for the measurement of each parameter can be performed after the fit. A flexible user interface is implemented, allowing a wide range of different types of observables and a wide range of parameters to be used.
机译:只要实现超对称(SUSY),大型强子对撞机(LHC)和未来的国际直线对撞机(ILC)可能会提供来自SUSY流程的大量精确数据。一个重要的任务将是提取拉格朗日参数。在此基础上,目标是从被测观测值中发现潜在的对称破坏机制。为了确定SUSY参数,已经开发了Fittino程序。它使用迭代拟合技术和模拟退火算法直接从可观测对象确定SUSY参数,而无需对参数有任何先验知识,使用对质量和耦合的所有可用回路校正。模拟退火是一种稳定,有效的方法,可以找到最佳参数值。可以从任何带有SUSY Les Houches Accord界面的程序提供理论预测。作为拟合结果,获得了包括完整误差矩阵和二维不确定性轮廓在内的一组参数,可以自动创建Pull分布,并允许对拟合结果进行独立的交叉检查,并确定参数确定中可能的系统偏移。在拟合之后,可以确定各个可观察物对于测量每个参数的重要性。实现了灵活的用户界面,允许使用各种不同类型的可观察对象和各种参数。

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