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High statistic measurement of the K- -> pi0 e- nu decay form-factors | O.P.Yushchenko
; S.A.Akimenko
; G.I.Britvich
; K.V.Datsko
; A.P.Filin
; A.V.Inyakin
; A.S.Konstantinov
; V.F.Konstantinov
; I.Y.Korolkov
; V.A.Khmelnikov
; V.M.Leontiev
; V.P.Novikov
; V.F.Obraztsov
; V.A.Polyakov
; V.I.Romanovsky
; V.M.Ronjin
; V.I.Shelikhov
; N.E.Smirnov
; O.G.Tchikilev
; V.A.Uvarov
; V.N.Bolotov
; S.V.Laptev
; A.Yu.Polyarush
; | Date: |
23 Apr 2004 | Journal: | Phys.Lett. B589 (2004) 111-117 | Subject: | hep-ex | Affiliation: | Institute for High Energy Physics, Protvino, Russia), V.N.Bolotov, S.V.Laptev, A.Yu.Polyarush (Institute for Nuclear Research, Moscow, Russia | Abstract: | The decay K- -> pi0 e- nu is studied using in-flight decays detected with the ISTRA+ spectrometer. About 920K events are collected for the analysis. The lambda+ slope parameter of the decay form-factor f+(t) in the linear approximation (average slope) is measured: lambda+(lin)= 0.02774 +- 0.00047(stat) +- 0.00032(syst). The quadratic contribution to the form-factor was estimated to be lambda’+ = 0.00084 +- 0.00027(stat) +- 0.00031(syst). The linear slope, which has a meaning of df+(t)/dt|_{t=0} for this fit, is lambda+ = 0.02324 +- 0.00152(stat) +- 0.00032(syst). The limits on possible tensor and scalar couplings are derived: f_{T}/f_{+}(0)=-0.012 +- 0.021(stat) +- 0.011$(syst), f_{S}/f_{+}(0)=-0.0037^{+0.0066}_{-0.0056}(stat) +- 0.0041(syst). | Source: | arXiv, hep-ex/0404030 | Services: | Forum | Review | PDF | Favorites |
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