Parity Projected QCD Sum Rule of the Nucleon with MEM

被引：0

作者：

Ohtani, Keisuke ^{[1
]}

Gubler, Philipp ^{[2
]}

Oka, Makoto ^{[1
]}

机构：

[1] Tokyo Inst Technol, Meguro Ku, Tokyo 1528551, Japan

[2] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan

来源：

FEW-BODY SYSTEMS | 2013年 / 54卷 / 7-10期

关键词：

RESONANCE;

D O I：

10.1007/s00601-013-0647-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nucleon and its negative-parity excited states are examined in a maximum entropy method analysis of QCD sum rules. We derive the parity projected nucleon sum rules with all known first order alpha (s) corrections to the Wilson coefficients of the operator product expansion (OPE). As these corrections have turned out to be large, we suppress them by using a phase-rotated Gaussian kernel. This phase rotation strongly suppresses the continuum contribution and improves the convergence of the OPE. The resulting sum rule has the interesting feature that it is dominated by the term containing the chiral condensate of dimension 3. Analyzing this sum rule by the maximum entropy method, we are able to extract information of both the positive and negative parity states.

引用

页码：1063 / 1066

页数：4

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