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).
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页码：58 / 72
页数：15
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