/ Experiment-HEP arXiv:0912.2165


Determination of the S-wave pi pi scattering lengths from a study of K+- ---> pi+- pi0 pi0 decays


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. (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) ; Calvetti, M. (INFN, Florence) ; Iacopini, E. (INFN, Florence) ; Ruggiero, G. (Pisa, Scuola Normale Superiore) ; Bizzeti, A. (Modena U.) ; Lenti, M. (INFN, Florence) ; Veltri, M. (Urbino U.) ; Behler, M. (INFN, Florence) ; Eppard, K. (INFN, Florence) ; Kleinknecht, K. (INFN, Florence) ; Marouelli, P. (INFN, Florence) ; 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. (Frascati) ; Imbergamo, E. (Frascati) ; Nappi, A. (Frascati) ; Piccini, M. (Frascati) ; Raggi, M. (Frascati) ; Valdata-Nappi, M. (INFN, Perugia) ; Cenci, P. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Petrucci, M.C. (INFN, Perugia) ; Cerri, C. (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Collazuol, G. (INFN, Pisa) ; Di Lella, 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. (DSM, DAPNIA, Saclay) ; Cheshkov, C. (CERN) ; Cheze, J.B. (DSM, DAPNIA, Saclay) ; De Beer, M. (DSM, DAPNIA, Saclay) ; Derre, J. (DSM, DAPNIA, Saclay) ; Marel, G. (DSM, DAPNIA, Saclay) ; Mazzucato, E. (DSM, DAPNIA, Saclay) ; Peyaud, B. (DSM, DAPNIA, Saclay) ; Vallage, B. (DSM, DAPNIA, Saclay) ; Holder, M. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Marchetto, F. (INFN, Turin) ; Bifani, S. (Bern U.) ; Clemencic, M. (CERN) ; Goy Lopez, S. (Madrid, CIEMAT) ; 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: Eur.Phys.J.
Year: 2009
Vol.: C64
Page No: 589-608

Abstract: We report the results from a study of the full sample of ~ 6.031 10^7 K+- -> pi+- pi0 pi0 decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the pi0 pi0 invariant mass M00 distribution shows a cusp-like anomaly in the region around M00 = 2m+, where m+ is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process pi+ pi- -> p0 p0 in K+- -> pi+- pi+ pi- decay. Fits to the M00 distribution using two different theoretical formulations provide the presently most precise determination of (a0 - a2), the difference between the pi pi S-wave scattering lengths in the isospin I=0 and I=2 states. Higher-order pi pi rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a2.

Web-Page: http://inspirebeta.net/record/551664/files/a2vsa02_noth.png; http://inspirebeta.net/record/551664/files/ci_fits_delta.png; http://inspirebeta.net/record/551664/files/cuspa02.png; http://inspirebeta.net/record/551664/files/detector.png; http://inspirebeta.net/record/551664/files/dmk_plot.png; http://inspirebeta.net/record/551664/files/kplot.png; http://inspirebeta.net/record/551664/files/nonlin.png; http://inspirebeta.net/record/551664/files/pi0pi0_s3.png; http://inspirebeta.net/record/551664/files/pwidth.png; http://inspirebeta.net/record/551664/files/resol.png; http://inspirebeta.net/record/551664/files/trigeff.png; http://inspirebeta.net/record/551664/files/zdist.png

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