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
ANDERSON, HL
FUJII, T
MILLER, RH
TAU, L
[J]. PHYSICAL REVIEW, 1960, 119 (06): : 2050 - 2067
[2] RADIATIVE CORRECTIONS TO PION BETA-DECAY
BERMAN, SM
[J]. PHYSICAL REVIEW LETTERS, 1958, 1 (12) : 468 - 469
[3] MEASUREMENT OF THE PI+-]E+NU BRANCHING RATIO
BRITTON, DI
AHMAD, S
BRYMAN, DA
BURNHAM, RA
CLIFFORD, ETH
KITCHING, P
KUNO, Y
MACDONALD, JA
NUMAO, T
OLIN, A
POUTISSOU, JM
DIXIT, MS
[J]. PHYSICAL REVIEW LETTERS, 1992, 68 (20) : 3000 - 3003
[4] NEW MEASUREMENT OF THE PI-]EV BRANCHING RATIO
BRYMAN, DA
DUBOIS, R
NUMAO, T
OLANIYI, B
OLIN, A
DIXIT, MS
BERGHOFER, D
POUTISSOU, JM
MACDONALD, JA
ROBERTSON, BC
[J]. PHYSICAL REVIEW LETTERS, 1983, 50 (01) : 7 - 10
[5] STUDY OF DECAY PHI 2 E + V
DICAPUA, E
STRELZOFF, A
GARLAND, R
PONDROM, L
[J]. 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
FAZZINI, T
FIDECARO, G
MERRISON, AW
PAUL, H
TOLLESTRUP, AV
[J]. PHYSICAL REVIEW LETTERS, 1958, 1 (07) : 247 - 248
[8] EXPERIMENTAL SEARCH FOR THE BETA-DECAY OF THE PI+ MESON
FRIEDMAN, HL
RAINWATER, J
[J]. PHYSICAL REVIEW, 1951, 84 (04): : 684 - 690
[9] RADIATIVE-CORRECTIONS TO LEPTONIC DECAYS OF CHARGED PSEUDOSCALAR MESONS
GOLDMAN, T
WILSON, WJ
[J]. PHYSICAL REVIEW D, 1977, 15 (03): : 709 - 724
[10] BETA-DECAY OF THE PION
IMPEDUGLIA, G
PLANO, R
PRODELL, A
SAMIOS, N
SCHWARTZ, M
STEINBERGER, J
[J]. PHYSICAL REVIEW LETTERS, 1958, 1 (07) : 249 - 251

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