Optimization of Neutrino Oscillation Parameters Using Differential Evolution

作     者：Ghulam Mustafa Faisal Akram Bilal Masud 

作者机构：Centre for High Energy PhysicsUniversity of the PunjabLahore(54590)Pakistan 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2013年第59卷第3期

页      面：324-330页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：the Higher Education Commission(HEC) of Pakistan for its financial support through Grant No.17-5-2(Ps2-044) HEC/Sch/2004 

主　　题：solar neutrinos neutrino masses and mixing numerical optimization 

摘      要：We show how the traditional grid based method for finding neutrino oscillation parameters △m2 and tan2θ can be combined with an optimization technique, Differential Evolution （DE）, to get a significant decrease in computer processing time required to obtain minimal chi-square （χ2） in four different regions of the parameter space. We demonstrate efficiency for the two-neutrinos case. For this, the χ2 function for neutrino oscillations is evaluated for grids with different density of points in standard allowed regions of the parameter space of △m2 and tan2θ using experimental and theoretical total event rates of ehlorine （Homestake）, Gallex＋GNO, SAGE, Superkamiokande, and SNO detectors. We find that using DE in combination with the grid based method with smail density of points can produce the results comparable with the one obtained using high density grid, in much lesser computation time.