SEARCH FOR THE HYPOTHETICAL PI-]MU-X-DECAY

被引：16

作者：

BILGER, R

CLEMENT, H

DENIG, A

FOHL, K

HAUTLE, P

KLUGE, W

KONTER, JA

KURZ, G

MANGO, S

SCHAPLER, D

SCHONLEBER, F

SIODLACZEK, U

VANDENBRANDT, B

WAGNER, GJ

WIESER, R

机构：

[1] UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76021 KARLSRUHE,GERMANY

[2] PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND

来源：

PHYSICS LETTERS B | 1995年 / 363卷 / 1-2期

关键词：

RARE DECAY OF PION; NON-STANDARD-MODEL NEUTRINO;

D O I：

10.1016/0370-2693(95)01232-F

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The KARMEN collaboration has reported the possible observation of a hitherto unknown neutral and weakly interacting particle x, which is produced in the decay pi(+) --> mu(+)x with a mass m(x) = 33.9 MeV. We have searched for this hypothetical decay branch by studying muons from pion decay in flight with the LEPS spectrometer at the pi E3 channel at PSI and find branching ratios BR(pi(-) --> mu(-) (x) over bar) < 4 x 10(-7) and BR(pi(+) --> mu(+)x) < 7 x 10(-8) (95% C.L.).

引用

页码：41 / 45

页数：5

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