/ hep-ex PREPRINT-IHEP-2017-2

$K_{e3}$ decay studies in OKA experiment

Yushchenko, O.P. (Serpukhov, IHEP) ; Kurshetsov, V.F. (Serpukhov, IHEP) ; Filin, A.P. (Serpukhov, IHEP) ; Akimenko, S.A. (Serpukhov, IHEP) ; Artamonov, A.V. (Serpukhov, IHEP) ; Blik, A.M. (Serpukhov, IHEP) ; Brekhovskikh, V.V. (Serpukhov, IHEP) ; Burtovoy, V.S. (Serpukhov, IHEP) ; Donskov, S.V. (Serpukhov, IHEP) ; Inyakin, A.V. (Serpukhov, IHEP) ; Gorin, A.M. (Serpukhov, IHEP) ; Khaustov, G.V. (Serpukhov, IHEP) ; Kholodenko, S.A. (Serpukhov, IHEP) ; Kolosov, V.N. (Serpukhov, IHEP) ; Konstantinov, A.S. (Serpukhov, IHEP) ; Leontiev, V.M. (Serpukhov, IHEP) ; Lishin, V.A. (Serpukhov, IHEP) ; Medynsky, M.V. (Serpukhov, IHEP) ; Mikhailov, Yu. V. (Serpukhov, IHEP) ; Obraztsov, V.F. (Serpukhov, IHEP) ; Polyakov, V.A. (Serpukhov, IHEP) ; Popov, A.V. (Serpukhov, IHEP) ; Romanovsky, V.I. (Serpukhov, IHEP) ; Rykalin, V.I. (Serpukhov, IHEP) ; Sadovsky, A.S. (Serpukhov, IHEP) ; Samoilenko, V.D. (Serpukhov, IHEP) ; Semenov, V.K. (Serpukhov, IHEP) ; Stenyakin, O.V. (Serpukhov, IHEP) ; Tchikilev, O.G. (Serpukhov, IHEP) ; Uvarov, V.A. (Serpukhov, IHEP) ; Duk, V.A. (Moscow, INR) ; Filippov, S.N. (Moscow, INR) ; Guschin, E.V. (Moscow, INR) ; Kudenko, Yu. G. (Moscow, INR) ; Khudyakov, A.A. (Moscow, INR) ; Kravtsov, V.I. (Moscow, INR) ; Polyarush, A. Yu. (Moscow, INR) ; Bychkov, V.N. (Dubna, JINR) ; Kekelidze, G.D. (Dubna, JINR) ; Lysan, V.M. (Dubna, JINR) ; Zalikhanov, B. Zh. (Dubna, JINR)

Pages: 10

Abstract: Recent results from OKA setup concerning form factor studies in $K_{e3}$ decay are presented. About 5.25M events are selected for the analysis. The linear and quadratic slopes for the decay formfactor $f_{+}(t)$ are measured: $\lambda'_{+}=(26.1 \pm 0.35 \pm 0.28 )\times 10^{-3}$, $\lambda"_{+}=(1.91 \pm 0.19 \pm 0.14)\times 10^{-3}$. The scalar and tensor contributions are compatible with zero. Several alternative parametrizations are tried: the Pole fit parameter is found to be $M_V = 891 \pm 2.0$ MeV ; the parameter of the Dispersive parametrization is measured to be $\Lambda_+ =(24.58 \pm 0.18) \times 10^{-3}$. The presented results are considered as preliminary.

Web-Page: http://inspirehep.net/record/1620908/files/FairAngle_G.png; http://inspirehep.net/record/1620908/files/ep.png; http://inspirehep.net/record/1620908/files/oka.png; http://inspirehep.net/record/1620908/files/ZComparison.png; http://inspirehep.net/record/1620908/files/Cont.png; http://inspirehep.net/record/1620908/files/arXiv:1708.09587.pdf

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