Fast computation of observed cross section for psi ' -> PP decays

	Fast computation of observed cross section for psi ' -> PP decays
	Wang BQ(王博群); Mo XH(莫晓虎); 王平(实); Wang, BQ; Mo, XH; Wang, P; Ban, Y
刊名	CHINESE PHYSICS C
	2011
卷号	35 期号:5 页码:411-418
关键词	cross section narrow resonance pseudoscalar pair e(+)e(-) collider
通讯作者	[Wang Bo-Qun ; Ban Yong] Peking Univ, Sch Phys, Beijing 100871, Peoples R China ; [Wang Bo-Qun ; Ban Yong] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China ; [Wang Bo-Qun ; Mo Xiao-Hu ; Wang Ping] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
英文摘要	It has been conjectured that the relative phase between strong and electromagnetic amplitudes is universally -90 degrees in charmonium decays. psi ' decaying into a pseudoscalar pair provides a possibility to test this conjecture. However, the experimentally observed cross section for such a process is depicted by the two-fold integral, which takes into account the initial state radiative (ISR) correction and energy spread effect. Using the generalized linear regression approach, a complex energy-dependent factor is approximated by a linear function of energy. Taking advantage of this simplification, the integration of ISR correction can be performed and an analytical expression with accuracy at the level of 1% is obtained. Then, the original two-fold integral is simplified into a one-fold integral, which reduces the total computing time by two orders of magnitude. Such a simplified expression for the observed cross section usually plays an indispensable role in the optimization of scan data taking, the determination of systematic uncertainty, and the analysis of data correlation.
学科主题	Physics
类目[WOS]	Physics, Nuclear ; Physics, Particles & Fields
研究领域[WOS]	Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000290352800001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/237371]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Wang BQ,Mo XH,Wang P,et al. Fast computation of observed cross section for psi ' -> PP decays[J]. CHINESE PHYSICS C,2011,35(5):411-418.
APA	王博群.,莫晓虎.,王平.,Wang, BQ.,Mo, XH.,...&Ban, Y.(2011).Fast computation of observed cross section for psi ' -> PP decays.CHINESE PHYSICS C,35(5),411-418.
MLA	王博群,et al."Fast computation of observed cross section for psi ' -> PP decays".CHINESE PHYSICS C 35.5(2011):411-418.