A comprehensive revisit of the ρ meson with improved Monte-Carlo based QCD sum rules  

作　　者：王齐男 张珠峰 T.G.Steele 金洪英 黄卓然 

机构地区：[1]Physics Department,Ningbo University [2]Department of Physics and Engineering Physics,University of Saskatchewan [3]Zhejiang Institute of Modern Physics,Zhejiang University

出　　处：《Chinese Physics C》2017年第7期96-106,共11页中国物理C（英文版）

基　　金：Supported by NSFC(11175153,11205093,11347020);Open Foundation of the Most Important Subjects of Zhejiang Province;K.C.Wong Magna Fund in Ningbo University;Supported by the Natural Sciences and Engineering Research Council of Canada(NSERC)

摘　　要：We improve the Monte-Carlo based QCD sum rules by introducing the rigorous Hoolder-inequalitydetermined sum rule window and a Breit-Wigner type parametrization for the phenomenological spectral function.In this improved sum rule analysis methodology, the sum rule analysis window can be determined without any assumptions on OPE convergence or the QCD continuum. Therefore, an unbiased prediction can be obtained for the phenomenological parameters（the hadronic mass and width etc.）. We test the new approach in the ρ meson channel with re-examination and inclusion of αs corrections to dimension-4 condensates in the OPE. We obtain results highly consistent with experimental values. We also discuss the possible extension of this method to some other channels.We improve the Monte-Carlo based QCD sum rules by introducing the rigorous Hoolder-inequalitydetermined sum rule window and a Breit-Wigner type parametrization for the phenomenological spectral function.In this improved sum rule analysis methodology, the sum rule analysis window can be determined without any assumptions on OPE convergence or the QCD continuum. Therefore, an unbiased prediction can be obtained for the phenomenological parameters（the hadronic mass and width etc.）. We test the new approach in the ρ meson channel with re-examination and inclusion of αs corrections to dimension-4 condensates in the OPE. We obtain results highly consistent with experimental values. We also discuss the possible extension of this method to some other channels.

关 键 词：QCD sum rules Hlder inequality phenomenological spectral function αs corrections to dimension-4 operators 

分 类 号：O572.33[理学—粒子物理与原子核物理]