Publication Date:
2021-02-01
Description:
Results of a study of the $$K^+
ightarrow pi ^{0} e^{+}
u gamma $$ K + → π 0 e + ν γ decay at OKA setup are presented. More than 32,000 events of this decay are observed. The differential spectra over the photon energy and the photon–electron opening angle in kaon rest frame are presented. The branching ratios, normalized to that of $$K_{e3}$$ K e 3 decay are calculated for different cuts on $$E^*_gamma $$ E γ ∗ and $$cosTheta ^{*}_{egamma }$$ c o s Θ e γ ∗ . In particular, the branching ratio for $$E^{*}_{gamma }〉30$$ E γ ∗ 〉 30 MeV and $$Theta ^{*}_{e gamma }〉20^{circ }$$ Θ e γ ∗ 〉 20 ∘ is measured R = $$frac{Br(K^+
ightarrow pi ^{0} e^{+}
u _{e} gamma ) }{Br(K^+
ightarrow pi ^{0} e^{+}
u _{e})} $$ B r ( K + → π 0 e + ν e γ ) B r ( K + → π 0 e + ν e ) = = (0.587±0.010(stat.)±0.015(syst.))$$imes 10^{-2}$$ × 10 - 2 , which is in a good agreement with ChPT $$O(p^{4})$$ O ( p 4 ) calculations.
Print ISSN:
1434-6044
Electronic ISSN:
1434-6052
Topics:
Physics
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