/ Experiment-HEP arXiv:0903.3130

Precise measurement of the K+- ---> pi+-e+e- decay

Batley, J.R. (Cambridge U.) ; Culling, A.J. (Cambridge U.) ; Kalmus, G. (Cambridge U.) ; Lazzeroni, C. (Birmingham U.) ; Munday, D.J. (Cambridge U.) ; Slater, M.W. (Birmingham U.) ; Wotton, S.A. (Cambridge U.) ; Arcidiacono, R. (INFN, Turin) ; Bocquet, G. (CERN) ; Cabibbo, N. (INFN, Rome) ; Ceccucci, A. (CERN) ; Cundy, D. (Turin, Cosmo-Geofisica Lab) ; Falaleev, V. (CERN) ; Fidecaro, M. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Kubischta, W. (CERN) ; Norton, A. (INFN, Ferrara) ; Maier, A. (CERN) ; Patel, M. (CERN) ; Peters, A. (CERN) ; Balev, S. (Pisa, Scuola Normale Superiore) ; Frabetti, P.L. (Dubna, JINR) ; Goudzovski, E. (Birmingham U.) ; Hristov, P. (CERN) ; Kekelidze, V. (Dubna, JINR) ; Kozhuharov, V. (Sofiya U.) ; Litov, L. (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Marinova, E. (INFN, Perugia) ; Molokanova, N. (Dubna, JINR) ; Polenkevich, I. (Dubna, JINR) ; Potrebenikov, Yu. (Dubna, JINR) ; Stoynev, S. (Northwestern U.) ; Zinchenko, A. (Dubna, JINR) ; Monnier, E. (Marseille, CPPM) ; Swallow, E. (Chicago U., EFI) ; Winston, R. (Chicago U., EFI) ; Rubin, P. (George Mason U.) ; Walker, A. (Edinburgh U.) ; Baldini, W. (INFN, Ferrara) ; Cotta Ramusino, A. (INFN, Ferrara) ; Dalpiaz, P. (INFN, Ferrara) ; Damiani, C. (INFN, Ferrara) ; Fiorini, M. (CERN) ; 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. (Modena U.) ; Calvetti, M. (INFN, Florence) ; Celeghini, E. (INFN, Florence) ; Iacopini, E. (INFN, Florence) ; Lenti, M. (INFN, Florence) ; Martelli, F. (Urbino U.) ; Ruggiero, G. (Pisa, Scuola Normale Superiore) ; Veltri, M. (Urbino U.) ; 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. (Bonn U.) ; 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. (SLAC) ; Dabrowski, A. (Northwestern U.) ; Fonseca Martin, T. (Royal Holloway, U. of London) ; Shieh, M. (Northwestern U.) ; Szleper, M. (Northwestern U.) ; Velasco, M. (Northwestern U.) ; Wood, M.D. (UCLA) ; Anzivino, G. (INFN, Perugia) ; Cenci, P. (INFN, Perugia) ; Imbergamo, E. (INFN, Perugia) ; Nappi, A. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Petrucci, M.C. (INFN, Perugia) ; Piccini, M. (INFN, Perugia) ; Raggi, M. (Frascati) ; 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. (Barcelona, IFAE) ; Giudici, S. (INFN, Pisa) ; Pierazzini, G. (INFN, Pisa) ; Sozzi, M. (INFN, Pisa) ; Venditti, S. (INFN, Pisa) ; Bloch-Devaux, B. (DAPNIA, Saclay) ; Cheshkov, C. (CERN) ; 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.) ; Bifani, S. (Bern U.) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Clemencic, M. (CERN) ; Goy Lopez, S. (Madrid, CIEMAT) ; Marchetto, F. (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)

Published in: Phys.Lett.
Year: 2009
Vol.: B677
Page No: 246-254
Pages: 16

Abstract: A sample of 7253 $K^\pm\to\pi^\pm e^+e^-(\gamma)$ decay candidates with 1.0% background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a precise measurement of the decay properties. The branching ratio in the full kinematic range was measured to be ${\rm BR}=(3.11\pm0.12)\times 10^{-7}$, where the uncertainty includes also the model dependence. The shape of the form factor $W(z)$, where $z=(M_{ee}/M_K)^2$, was parameterized according to several models, and, in particular, the slope $\delta$ of the linear form factor $W(z)=W_0(1+\delta z)$ was determined to be $\delta=2.32\pm0.18$. A possible CP violating asymmetry of $K^+$ and $K^-$ decay widths was investigated, and a conservative upper limit of $2.1\times 10^{-2}$ at 90% CL was established.

Web-Page: http://inspirebeta.net/record/815724/files/acc-bw.png; http://inspirebeta.net/record/815724/files/costhe-bw.png; http://inspirebeta.net/record/815724/files/ffsq-bw.png; http://inspirebeta.net/record/815724/files/fit-bw.png; http://inspirebeta.net/record/815724/files/m2pi-bw.png; http://inspirebeta.net/record/815724/files/mpiee-bw.png; http://inspirebeta.net/record/815724/files/na48_2_beam.png; http://inspirebeta.net/record/815724/files/piee-ab.png; http://inspirebeta.net/record/815724/files/piee-friot.png; http://inspirebeta.net/record/815724/files/piee-perv.png; http://inspirebeta.net/record/815724/files/piee-pol.png; http://inspirebeta.net/record/815724/files/treff-bw.png; http://inspirebeta.net/record/815724/files/zdata-bw.png

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