Study of the K- -> pi0 e- nu decay
I.Ajinenko, S.Akimenko, G.Akopdzhanov, K.Belous, I.Britvich,, G.Britvich, A.Filin, V.Govorun, A.Inyakin, V.Konstantinov, A.Konstantinov,, I.Korolkov, V.Khmelnikov, V.Leontiev, V.Novikov, V.Obraztsov, V.Polyakov,, V.Romanovsky, V.Ronjin, V.Senko, N.Shalanda, M.Shapkin
TL;DR
This study investigates the semileptonic decay K- -> pi0 e- nu using in-flight detection, measuring form factor parameters and setting limits on tensor and scalar couplings, contributing to understanding weak interactions in kaon decays.
Contribution
It provides new measurements of the vector form factor lambda_+ and limits on tensor and scalar couplings in K- -> pi0 e- nu decay, using a large dataset from the ISTRA+ setup.
Findings
Measured lambda_+ = 0.0293 ± 0.0015(stat) ± 0.002(syst)
Set limits on tensor coupling f_T/f_+(0) = -0.044 +0.059 -0.057
Set limits on scalar coupling f_S/f_+(0) = -0.020 +0.025 -0.016
Abstract
The decay K- -> pi0 e- nu has been studied using in-flight decays detected with "ISTRA+" setup operating at the 25 GeV negative secondary beam of the U-70 PS. About 130K events were used for the analysis. The lambda_+ parameter of the vector formfactor has been measured: lambda_+ = 0.0293 +- 0.0015(stat) +- 0.002(syst). The limits on the possible tensor and scalar couplings have been derived: f_T/f_+(0)=-0.044 +0.059 -0.057 (stat) f_S/f_+(0)=-0.020 +0.025 -0.016 (stat)
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