/ Experiment-HEP arXiv:1206.7065

New measurement of the charged kaon semileptonic $K^\pm \to \pi^+\pi^- e^\pm\nu$ ($K_e4$) decay Branching Ratio and Hadronic Form Factors

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) ; Iacopini, E. (INFN, Florence) ; Ruggiero, G. (INFN, Florence) ; Behler, M. (Mainz U., Inst. Phys.) ; Eppard, K. (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. (Dongseo U.)

Pages: 21

Abstract: A sample of more than one million Ke4 decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003-2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of radiative Ke4gamma decays, is measured to be BR(Ke4) = (4.257 +/- 0.016_exp +/- 0.031_ext) x 10-5 with a total relative error of 0.8%. This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the pion-pion scattering lengths conducted on the same data sample. The overall form factor normalization f_s = 5.705 +/- 0.017_exp +/- 0.031_ext is obtained with a total relative precision of 0.6%.

Web-Page: http://inspirehep.net/record/1120514/files/arXiv:1206.7065.pdf; http://inspirehep.net/record/1120514/files/fig1a.png; http://inspirehep.net/record/1120514/files/fig1b.png; http://inspirehep.net/record/1120514/files/fig2a.png; http://inspirehep.net/record/1120514/files/fig2b.png; http://inspirehep.net/record/1120514/files/fig3a.png; http://inspirehep.net/record/1120514/files/fig3b.png; http://inspirehep.net/record/1120514/files/fig4a.png; http://inspirehep.net/record/1120514/files/fig4b.png; http://inspirehep.net/record/1120514/files/fig5.png; http://inspirehep.net/record/1120514/files/figbox5.png

Note: 21 pages, 5 figures, 5 tables, submitted to Phys. Lett. B

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