/ hep-ex CERN-PH-EP-2014-145

Detailed study of the $\mathrm{K^{\pm}} \rightarrow \pi^{0} \pi^{0} \mathrm{e^{\pm}} \nu$ ($\mathrm{K}_{\mathrm{e}4}^{00}$) decay properties

Batley, J.R. (Cambridge U.) ; Kalmus, G. (Cambridge U.) ; Lazzeroni, C. (Cambridge U.) ; Munday, D.J. (Cambridge U.) ; Slater, M.W. (Cambridge U.) ; Wotton, S.A. (Cambridge U.) ; Arcidiacono, R. (CERN) ; Bocquet, G. (CERN) ; Cabibbo, N. (CERN) ; Ceccucci, A. (CERN) ; Cundy, D. (CERN) ; Falaleev, V. (CERN) ; Fidecaro, M. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Kubischta, W. (CERN) ; Norton, A. (CERN) ; Maier, A. (CERN) ; Patel, M. (CERN) ; Peters, A. (CERN) ; Balev, S. (Dubna, JINR) ; Frabetti, P.L. (Dubna, JINR) ; Gersabeck, E. (Dubna, JINR) ; Goudzovski, E. (Dubna, JINR) ; Hristov, P. (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Kozhuharov, V. (Dubna, JINR) ; Litov, L. (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Polenkevich, I. (Dubna, JINR) ; Potrebenikov, Yu. (Dubna, JINR) ; Stoynev, S. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Monnier, E. (Chicago U., EFI) ; Swallow, E. (Chicago U., EFI) ; Winston, R. (Chicago U., EFI) ; Rubin, P. (Edinburgh U.) ; Walker, A. (Edinburgh U.) ; Baldini, W. (INFN, Ferrara) ; Cotta Ramusino, A. (INFN, Ferrara) ; Dalpiaz, P. (INFN, Ferrara) ; Damiani, C. (INFN, Ferrara) ; Fiorini, M. (INFN, Ferrara) ; Gianoli, A. (INFN, Ferrara) ; Martini, M. (INFN, Ferrara) ; Petrucci, F. (INFN, Ferrara) ; Savrie, M. (INFN, Ferrara) ; Scarpa, M. (INFN, Ferrara) ; Wahl, H. (INFN, Ferrara) ; Bizzeti, A. (INFN, Florence) ; Lenti, M. (INFN, Florence) ; Veltri, M. (INFN, Florence) ; Calvetti, M. (INFN, Florence) ; Celeghini, E. (INFN, Florence) ; Iacopini, E. (INFN, Florence) ; Ruggiero, G. (INFN, Florence) ; Behler, M. (Mainz U., Inst. Phys.) ; Eppard, K. (Mainz U., Inst. Phys.) ; Gersabeck, M. (Mainz U., Inst. Phys.) ; Kleinknecht, K. (Mainz U., Inst. Phys.) ; Marouelli, P. (Mainz U., Inst. Phys.) ; Masetti, L. (Mainz U., Inst. Phys.) ; Moosbrugger, U. (Mainz U., Inst. Phys.) ; Morales Morales, C. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Wache, M. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Coward, D. (Northwestern U.) ; Dabrowski, A. (Northwestern U.) ; Fonseca Martin, T. (Northwestern U.) ; Shieh, M. (Northwestern U.) ; Szleper, M. (Northwestern U.) ; Velasco, M. (Northwestern U.) ; Wood, M.D. (Northwestern U.) ; Cenci, P. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Petrucci, M.C. (INFN, Perugia) ; Anzivino, G. (INFN, Perugia) ; Imbergamo, E. (INFN, Perugia) ; Nappi, A. (INFN, Perugia) ; Piccini, M. (INFN, Perugia) ; Raggi, M. (INFN, Perugia) ; Valdata-Nappi, M. (INFN, Perugia) ; Cerri, C. (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Collazuol, G. (INFN, Pisa) ; DiLella, L. (INFN, Pisa) ; Lamanna, G. (INFN, Pisa) ; Mannelli, I. (INFN, Pisa) ; Michetti, A. (INFN, Pisa) ; Costantini, F. (INFN, Pisa) ; Doble, N. (INFN, Pisa) ; Fiorini, L. (INFN, Pisa) ; Giudici, S. (INFN, Pisa) ; Pierazzini, G. (INFN, Pisa) ; Sozzi, M. (INFN, Pisa) ; Venditti, S. (INFN, Pisa) ; Bloch-Devaux, B. (DAPNIA, Saclay) ; Cheshkov, C. (DAPNIA, Saclay) ; Cheze, J.B. (DAPNIA, Saclay) ; De Beer, M. (DAPNIA, Saclay) ; Derre, J. (DAPNIA, Saclay) ; Marel, G. (DAPNIA, Saclay) ; Mazzucato, E. (DAPNIA, Saclay) ; Peyaud, B. (DAPNIA, Saclay) ; Vallage, B. (DAPNIA, Saclay) ; Holder, M. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Marchetto, F. (INFN, Turin) ; Bifani, S. (INFN, Turin) ; Clemencic, M. (INFN, Turin) ; Goy Lopez, S. (INFN, Turin) ; Dibon, H. (Vienna, OAW) ; Jeitler, M. (Vienna, OAW) ; Markytan, M. (Vienna, OAW) ; Mikulec, I. (Vienna, OAW) ; Neuhofer, G. (Vienna, OAW) ; Widhalm, L. (Vienna, OAW)

Pages: 27

Abstract: A sample of 65210 $\mathrm{K^{\pm}} \rightarrow \pi^{0} \pi^{0} \mathrm{e^{\pm}} \nu$ ($\mathrm{K}_{\mathrm{e}4}^{00}$) decay candidates with $1\%$ background contamination has been collected in 2003$-$2004 by the NA48/2 collaboration at the CERN SPS. A study of the differential rate provides the first measurement of the hadronic form factor variation in the plane $(M_{\pi\pi}^2,M_{e\nu}^2)$ and brings evidence for a cusp-like structure in the distribution of the squared $\pi^{0} \pi^{0}$ invariant mass around $4m_{\pi^+}^2$. Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the $\mathrm{K^{\pm}} \rightarrow \pi^{0} \pi^{0} \pi^{\pm}$ decay mode as normalization. It is measured to be BR($\mathrm{K}_{\mathrm{e}4}^{00}$) = $(2.552 \pm 0.010_{stat} \pm 0.010_{syst} \pm 0.032_{ext} ) \times 10^{-5}$, which improves the current world average precision by an order of magnitude while the $1.4\%$ relative precision is dominated by the external uncertainty from the normalization mode. A comparison with the properties of the corresponding mode involving a $\pi^{+} \pi^{-}$ pair ($\mathrm{K}_{\mathrm{e}4}^{+-}$) is also presented.

Web-Page: http://inspirehep.net/record/1301219/files/capfig4.png; http://inspirehep.net/record/1301219/files/capfig8.png; http://inspirehep.net/record/1301219/files/capfig9.png; http://inspirehep.net/record/1301219/files/fig10a.png; http://inspirehep.net/record/1301219/files/fig10b.png; http://inspirehep.net/record/1301219/files/fig10c.png; http://inspirehep.net/record/1301219/files/fig11a.png; http://inspirehep.net/record/1301219/files/fig11b.png; http://inspirehep.net/record/1301219/files/fig12.png; http://inspirehep.net/record/1301219/files/fig1a.png; http://inspirehep.net/record/1301219/files/fig1b.png; http://inspirehep.net/record/1301219/files/fig2a.png; http://inspirehep.net/record/1301219/files/fig2b.png; http://inspirehep.net/record/1301219/files/fig3a.png; http://inspirehep.net/record/1301219/files/fig3b.png; http://inspirehep.net/record/1301219/files/fig4a.png; http://inspirehep.net/record/1301219/files/fig4b.png; http://inspirehep.net/record/1301219/files/fig5.png; http://inspirehep.net/record/1301219/files/fig6a.png; http://inspirehep.net/record/1301219/files/fig6b.png; http://inspirehep.net/record/1301219/files/fig7a.png; http://inspirehep.net/record/1301219/files/fig7b.png; http://inspirehep.net/record/1301219/files/fig8a.png; http://inspirehep.net/record/1301219/files/fig8b.png; http://inspirehep.net/record/1301219/files/fig8c.png; http://inspirehep.net/record/1301219/files/fig9a.png; http://inspirehep.net/record/1301219/files/fig9b.png; http://inspirehep.net/record/1301219/files/arXiv:1406.4749.pdf

Note: *Temporary entry*; 27 pages, 12 figures, 7 tables, submitted to JHEP

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