HOW PRECISELY CAN ONE DETERMINE M(U)/M(D)

被引：27

作者：

CHOI, K

机构：

[1] Department of Physics, University of California, San Diego, La Jolla, CA 92093-0319

来源：

NUCLEAR PHYSICS B | 1992年 / 383卷 / 1-2期

关键词：

D O I：

10.1016/0550-3213(92)90670-7

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We point out that in order to precisely determine the quark mass ratio m(u)/m(d) one needs to theoretically calculate a QCD matrix element which receives a potentially large contribution from instantons. Within the semiclassical approximation, this instanton contribution can be large enough to have m(u) = 0 without any difficulty. We also discuss how instantons affect the chiral coupling constant L7 whose value was recently estimated by Leutwyler to determine m(u)/m(d).

引用

页码：58 / 72

页数：15

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