EXPERIMENTAL INVESTIGATION OF THE RADIATIVE STRUCTURE DECAY K+-]E+NU-GAMMA

被引：43

作者：

HEINTZE, J ^{[1
]}

HEINZELMANN, G ^{[1
]}

IGOKEMENES, P ^{[1
]}

MUNDHENKE, R ^{[1
]}

RIESEBERG, H ^{[1
]}

SCHURLEIN, B ^{[1
]}

SIEBERT, HW ^{[1
]}

SOERGEL, V ^{[1
]}

STELZER, H ^{[1
]}

STREIT, KP ^{[1
]}

WALENTA, AH ^{[1
]}

机构：

[1] CERN,CH-1211 GENEVA 23,SWITZERLAND

来源：

NUCLEAR PHYSICS B | 1979年 / 149卷 / 03期

关键词：

D O I：

10.1016/0550-3213(79)90001-4

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：

The decay K+ → e+υγ has been investigated. For the structure-dependent part with positive γ-helicity (SD+) the branching ratio Γ(SD+) Γ(Kμ2) = (2.33 ± 0.42) × 10-5 is obtained from 51 ± 3 events observed in the kinematical region Ee ≥ 235 MeV, Eγ > 48 MeV and θeγ > 140°. For the corresponding part with negative γ-helicity we obtain an upper limit Γ(SD-)/Γ(SD+) < 11 (90% CL) from the sample of electrons with energies 220 MeV ≤ Ee < 230 MeV and with no γ in the backward direction. This upper limit implies that the ratio of structure-dependent axial vector amplitudes lies outside the region -1.8 < aK υK < -0.54. For the decay K+ → e+ννν the limit Γ(K+ → e+ννν)/Γ(Ke2) < 3.8 90% confidence level) was found. © 1979.

引用

页码：365 / 380

页数：16

共 20 条

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