/ Experiment-HEP hep-ex/0611052


Measurement of the ratio Gamma(KL ---> pi+ pi-) / Gamma(KL ---> pi e nu) and extraction of the CP violation parameter |eta(+-)|


Lai, A. (INFN, Cagliari) ; Marras, D. (INFN, Cagliari) ; Bevan, A. (Cambridge U.) ; Dosanjh, R.S. (Cambridge U.) ; Gershon, T.J. (Cambridge U.) ; Hay, B. (Cambridge U.) ; Kalmus, G.E. (Cambridge U.) ; Lazzeroni, C. (Cambridge U.) ; Munday, D.J. (Cambridge U.) ; Olaiya, E. (Cambridge U.) ; Parker, Michael Andrew (Cambridge U.) ; White, T.O. (Cambridge U.) ; Wotton, S.A. (Cambridge U.) ; Barr, G. (CERN) ; Bocquet, G. (CERN) ; Ceccucci, A. (CERN) ; Cuhadar-Donszelmann, T. (CERN) ; Cundy, D. (CERN) ; D'Agostini, G. (CERN) ; Doble, N. (CERN) ; Falaleev, V. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Gorini, B. (CERN) ; Govi, G. (CERN) ; Grafstrom, P. (CERN) ; Kubischta, W. (CERN) ; Lacourt, A. (CERN) ; Norton, A. (CERN) ; Palestini, S. (CERN) ; Panzer-Steindel, B. (CERN) ; Taureg, H. (CERN) ; Velasco, M. (CERN) ; Wahl, H. (CERN) ; Cheshkov, C. (Dubna, JINR) ; Gaponenko, A. (Dubna, JINR) ; Hristov, P. (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Litov, L. (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Potrebenikov, Yu. (Dubna, JINR) ; Stoynev, S. (Dubna, JINR) ; Tatishvili, G. (Dubna, JINR) ; Tkatchev, A. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Knowles, I. (Edinburgh U.) ; Martin, V. (Edinburgh U.) ; Sacco, R. (Edinburgh U.) ; Walker, A. (Edinburgh U.) ; Contalbrigo, M. (INFN, Ferrara) ; Dalpiaz, P. (INFN, Ferrara) ; Duclos, J. (INFN, Ferrara) ; Frabetti, P.L. (INFN, Ferrara) ; Gianoli, A. (INFN, Ferrara) ; Martini, M. (INFN, Ferrara) ; Petrucci, F. (INFN, Ferrara) ; Savrie, M. (INFN, Ferrara) ; Bizzeti, A. (INFN, Florence) ; Calvetti, M. (INFN, Florence) ; Collazuol, G. (INFN, Florence) ; Graziani, G. (INFN, Florence) ; Iacopini, E. (INFN, Florence) ; Lenti, M. (INFN, Florence) ; Martelli, F. (INFN, Florence) ; Veltri, M. (INFN, Florence) ; Becker, H.G. (Mainz U., Inst. Phys.) ; Eppard, K. (Mainz U., Inst. Phys.) ; Eppard, M. (Mainz U., Inst. Phys.) ; Fox, H. (Mainz U., Inst. Phys.) ; Kalter, A. (Mainz U., Inst. Phys.) ; Kleinknecht, K. (Mainz U., Inst. Phys.) ; Koch, U. (Mainz U., Inst. Phys.) ; Kopke, L. (Mainz U., Inst. Phys.) ; Lopes da Silva, P. (Mainz U., Inst. Phys.) ; Marouelli, P. (Mainz U., Inst. Phys.) ; Pellmann, I. (Mainz U., Inst. Phys.) ; Peters, A. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Schmidt, S.A. (Mainz U., Inst. Phys.) ; Schonharting, V. (Mainz U., Inst. Phys.) ; Schue, Y. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Wittgen, M. (Mainz U., Inst. Phys.) ; Chollet, J.C. (Orsay, LAL) ; Fayard, L. (Orsay, LAL) ; Iconomidou-Fayard, L. (Orsay, LAL) ; Ocariz, J. (Orsay, LAL) ; Unal, G. (Orsay, LAL) ; Wingerter-Seez, I. (Orsay, LAL) ; Anzivino, G. (INFN, Perugia) ; Cenci, P. (INFN, Perugia) ; Imbergamo, E. (INFN, Perugia) ; Lubrano, P. (INFN, Perugia) ; Mestvirishvili, A. (INFN, Perugia) ; Nappi, A. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Piccini, M. (INFN, Perugia) ; Bertanza, L. (INFN, Pisa) ; Carosi, R. (INFN, Pisa) ; Cerri, C. (INFN, Pisa) ; Cirilli, M. (INFN, Pisa) ; Costantini, F. (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Giudici, S. (INFN, Pisa) ; Mannelli, I. (INFN, Pisa) ; Pierazzini, G. (INFN, Pisa) ; Sozzi, M. (INFN, Pisa) ; Cheze, J.B. (DSM, DAPNIA, Saclay) ; Cogan, J. (DSM, DAPNIA, Saclay) ; De Beer, M. (DSM, DAPNIA, Saclay) ; Debu, P. (DSM, DAPNIA, Saclay) ; Formica, A. (DSM, DAPNIA, Saclay) ; Granier de Cassagnac, R. (DSM, DAPNIA, Saclay) ; Mazzucato, E. (DSM, DAPNIA, Saclay) ; Peyaud, B. (DSM, DAPNIA, Saclay) ; Turlay, R. (DSM, DAPNIA, Saclay) ; Vallage, B. (DSM, DAPNIA, Saclay) ; Holder, M. (Siegen U.) ; Maier, A. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Arcidiacono, R. (INFN, Turin) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Guida, R. (INFN, Turin) ; Marchetto, F. (INFN, Turin) ; Menichetti, Ezio A. (INFN, Turin) ; Pastrone, N. (INFN, Turin) ; Nassalski, J. (Warsaw, Inst. Nucl. Studies) ; Rondio, E. (Warsaw, Inst. Nucl. Studies) ; Szleper, M. (Warsaw, Inst. Nucl. Studies) ; Wislicki, W. (Warsaw, Inst. Nucl. Studies) ; Wronka, S. (Warsaw, Inst. Nucl. Studies) ; Dibon, H. (Vienna, OAW) ; Fischer, G. (Vienna, OAW) ; Jeitler, M. (Vienna, OAW) ; Markytan, M. (Vienna, OAW) ; Mikulec, I. (Vienna, OAW) ; Neuhofer, G. (Vienna, OAW) ; Pernicka, M. (Vienna, OAW) ; Taurok, A. (Vienna, OAW) ; Widhalm, L. (Vienna, OAW)

Published in: Phys.Lett.
Year: 2007
Vol.: B645
Page No: 26-35
Pages: 20

Abstract: We present a measurement of the ratio of the decay rates Gamma(KL -> pi+ pi-)/Gamma(KL -> pi e nu), denoted as Gamma(K2pi)/Gamma(Ke3). The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47000 K2pi and five million Ke3 decays, we find Gamma(K2pi)/Gamma(Ke3) = (4.835 +- 0.022(stat) +- 0.016(syst)) x 10^-3. From this we derive the branching ratio of the CP violating decay KL -> pi+ pi- and the CP violation parameter |eta+-|. Excluding the CP conserving direct photon emission component KL -> pi+ pi- gamma, we obtain the results BR(KL -> pi+ pi-) = (1.941 +- 0.019) x 10^-3 and |eta+-| = (2.223 +- 0.012) x 10^-3.

Keyword(s): Kaon decays ; CP violation

Web-Page: http://weblib.cern.ch/abstract?CERN-PH-EP-2006-034; http://pdglive.lbl.gov/REFERENCE_info1.brl?slacrpp=PHLTA,B645,26

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