BRANCHING RATIO FOR THE RARE PION DECAY INTO POSITRON AND NEUTRINO

被引：139

作者：

CZAPEK, G ^{[1
]}

FEDERSPIEL, A ^{[1
]}

FLUCKIGER, A ^{[1
]}

FREI, D ^{[1
]}

HAHN, B ^{[1
]}

HUG, C ^{[1
]}

HUGENTOBLER, E ^{[1
]}

KREBS, W ^{[1
]}

MOSER, U ^{[1
]}

MUSTER, D ^{[1
]}

RAMSEYER, E ^{[1
]}

SCHEIDIGER, H ^{[1
]}

SCHLATTER, P ^{[1
]}

STUCKI, G ^{[1
]}

ABELA, R ^{[1
]}

RENKER, D ^{[1
]}

STEINER, E ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.70.17

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new precision measurement of the branching ratio of the rare pion decay into a positron and a neutrino (pi --> ev) has been completed. A beam of positive pions was stopped in an active target of plastic scintillator surrounded by a 4pi BGO calorimeter. 3 x 10(5) rare decays and 1.2 x 10(6) normal pion decays (pi --> muv) were recorded. The branching ratio was finally calculated from 1.2 x 10(5) rare decays after various cuts in the time window from 7.5 to 200 ns after pion stop. The errors of the result (1.235 +/- 0.005) x 10(-4) are 0.28% statistical and 0.29% systematical.

引用

页码：17 / 20

页数：4

共 15 条

[1] BRANCHING RATIO OF THE ELECTRONIC MODE OF POSITIVE PION DECAY [J].

ANDERSON, HL ;

FUJII, T ;

MILLER, RH ;

TAU, L .

PHYSICAL REVIEW, 1960, 119 (06) :2050-2067

[2] RADIATIVE CORRECTIONS TO PION BETA-DECAY [J].

BERMAN, SM .

PHYSICAL REVIEW LETTERS, 1958, 1 (12) :468-469

[3] MEASUREMENT OF THE PI+-]E+NU BRANCHING RATIO [J].

BRITTON, DI ;

AHMAD, S ;

BRYMAN, DA ;

BURNHAM, RA ;

CLIFFORD, ETH ;

KITCHING, P ;

KUNO, Y ;

MACDONALD, JA ;

NUMAO, T ;

OLIN, A ;

POUTISSOU, JM ;

DIXIT, MS .

PHYSICAL REVIEW LETTERS, 1992, 68 (20) :3000-3003

[4] NEW MEASUREMENT OF THE PI-]EV BRANCHING RATIO [J].

BRYMAN, DA ;

DUBOIS, R ;

NUMAO, T ;

OLANIYI, B ;

OLIN, A ;

DIXIT, MS ;

BERGHOFER, D ;

POUTISSOU, JM ;

MACDONALD, JA ;

ROBERTSON, BC .

PHYSICAL REVIEW LETTERS, 1983, 50 (01) :7-10

[5] STUDY OF DECAY PHI 2 E + V [J].

DICAPUA, E ;

STRELZOFF, A ;

GARLAND, R ;

PONDROM, L .

PHYSICAL REVIEW B, 1964, 133 (5B) :1333-+

[6]

DIETRICH SS, 1988, ATOM DATA NUCL DATA, V38, P199, DOI [10.1016/0092-640X(88)90033-2, 10.1016/0092-640X(75)90010-8]

[7] ELECTRON DECAY OF THE PION [J].

FAZZINI, T ;

FIDECARO, G ;

MERRISON, AW ;

PAUL, H ;

TOLLESTRUP, AV .

PHYSICAL REVIEW LETTERS, 1958, 1 (07) :247-248

[8] EXPERIMENTAL SEARCH FOR THE BETA-DECAY OF THE PI+ MESON [J].

FRIEDMAN, HL ;

RAINWATER, J .

PHYSICAL REVIEW, 1951, 84 (04) :684-690

[9] RADIATIVE-CORRECTIONS TO LEPTONIC DECAYS OF CHARGED PSEUDOSCALAR MESONS [J].

GOLDMAN, T ;

WILSON, WJ .

PHYSICAL REVIEW D, 1977, 15 (03) :709-724

[10] BETA-DECAY OF THE PION [J].

IMPEDUGLIA, G ;

PLANO, R ;

PRODELL, A ;

SAMIOS, N ;

SCHWARTZ, M ;

STEINBERGER, J .

PHYSICAL REVIEW LETTERS, 1958, 1 (07) :249-251

← 1 2 →