MEASUREMENT OF THE BRANCHING RATIO FOR GAMMA(1S) STATE INTO MU+MU- AND SEARCH FOR DECAYS GAMMA(1S)-]PI+PI-, K+K-, P(P)BAR

被引：43

作者：

BARU, SE

BEILIN, MV

BLINOV, AE

BLINOV, VE

BONDAR, AE

BUKIN, AD

GROSHEV, VR

KLIMENKO, SG

KOLACHEV, GM

ONUCHIN, AP

PANIN, VS

PROTOPOPOV, IY

SHAMOV, AG

SIDOROV, VA

SKOVPEN, YI

SKRINSKY, AN

TAYURSKY, VA

TELNOV, VI

TIKHONOV, YA

TUMAIKIN, GM

UNDRUS, AE

VOROBIOV, AI

ZILICH, VN

机构：

[1] Institute of Nuclear Physics, Novosibirsk

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1992年 / 54卷 / 02期

关键词：

D O I：

10.1007/BF01566650

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：

In the experiment with e+ e--beams performed at the VEPP-4 storage ring with the MD-1 detector we have measured B(mu-mu), the branching ratio for the decay of UPSILON (1S) state into mu+ mu-. We obtained B(mu-mu) = (2.12 + 0.20 + 0.10)%. It is shown that the continuum and resonance interference should be taken into account. For the first time the upper limits on the branching ratio for the decays UPSILON --> pi+ pi-, K+ K-, ppBAR have been measured: Br(UPSILON --> pi+ pi-) < 5.10(-4), Br(UPSILON --> K+ K-) < 5.10(-4)Br(UPSILON --> ppBAR) < 9.10(-4) (90% CL).

引用

页码：229 / 234

页数：6

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