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Precision measurement of the ratio BR(K(S) -> pi(+)pi(-)e(+)e(-))/BR(K(L) -> pi(+)pi(-)pi(0)(D)) RID A-4071-2012

Author:
Batley, J. R.  Kalmus, G. E.  Lazzeroni, C.  Munday, D. J.  Patel, M.  Slater, M. W.  Wotton, S. A.  Arcidiacono, R.  Bocquet, G.  Ceccucci, A.  Cundy, D.  Doble, N.  Falaleev, V.  Gatignon, L.  Gonidec, A.  Grafstroem, R.  Kubischta, W.  Marchetto, F.  Mikulec, I.  Norton, A.  Panzer-Steindel, B.  Rubin, P.  Wahl, H.  Goudzovski, E.  Hristov, P.  Kekelidze, V.  Kozhuharov, V.  Litov, L.  Madigozhin, D.  Molokanova, N.  Potrebenikov, Yu.  Stoynev, S.  Zinchenko, A.  Monnier, E.  Swallow, E. C.  Winston, R.  Sacco, R.  Walker, A.  Baldini, W.  Dalpiaz, P.  Frabetti, P. L.  Gianoli, A.  Martini, M.  Petrucci, F.  Savrie, M.  Scarpa, M.  Calvetti, M.  Collazuol, G.  Iacopini, E.  Ruggiero, G.  Bizzeti, A.  Lenti, M.  Veltri, M.  Behler, M.  Eppard, K.  Eppard, M.  Hirstius, A.  Kleinknecht, K.  Koch, U.  Marouelli, P.  Masetti, L.  Moosbrugger, U.  Morales, C. Morales  Peters, A.  Wanke, R.  Winhart, A.  Dabrowski, A.  Martin, T. Fonseca  Szleper, M.  Velasco, M.  Anzivino, G.  Imbergamo, E.  Lamanna, G.  Lubrano, P.  Michetti, A.  Nappi, A.  Piccini, M.  Valdata-Nappi, M.  Cenci, P.  Pepe, M.  Petrucci, M. C.  Cerri, C.  Fantechi, R.  Mannelli, I.  Costantini, F.  Fiorini, L.  Giudici, S.  Pierazzini, G.  Sozzi, M.  Cheshkov, C.  Cheze, J. B.  De Beer, M.  Debu, P.  Gouge, G.  Marel, G.  Mazzucato, E.  Peyaud, B.  Vallage, B.  Holder, M.  Maier, A.  Ziolkowski, M.  Biino, C.  Cartiglia, N.  Clemencic, M.  Goy Lopez, S.  Menichetti, E.  Pastrone, N.  Wislicki, W.  Dibon, H.  Jeitler, M.  Markytan, M.  Neuhofer, G.  Widhalm, L.  


Journal:
PHYSICS LETTERS B


Issue Date:
2011


Abstract(summary):

The K(S) -> pi(+)pi(-)e(+)e(-) decay mode was investigated using the data collected in 2002 by the NA48/1 Collaboration. With about 23 k K(S) -> pi(+)pi(-)e(+)e(-) events and 59 k K(L) -> pi(+)pi(-)pi(0)(D) normalization decays, the K(S) -> pi(+)pi(-)e(+)e(-) branching ratio relative to the K(L) -> pi(+)pi(-)pi(0)(D) one was determined to be BR(K(S) -> pi(+)pi(-)e(+)e(-))/BR(K(L) -> pi(+)pi(-)pi(0)(D)) = (3.28 +/- 0.06(stat) +/- 0.04(syst)) x 10(-2). This result was used to set the upper limit vertical bar g(E1)/g(BR)vertical bar < 3.0 at 90% CL on the presence, in the decay amplitude, of an E1 direct emission (g(E1)) term relative to the dominant inner bremsstrahlung (g(BR)) term. The CP-violating asymmetry A(phi) in the sin phi cos phi distribution of K(S) -> pi(+)pi(-)e(+)e(-) events, where phi is the angle between the pi(+)pi(-) and the e(+)e(-) decay planes in the kaon centre of mass, was found to be A(phi) = (-0.4 +/- 0.8)%, consistent with zero. These results are in good agreement with a description of the K(S) -> pi(+)pi(-)e(+)e(-) decay amplitude dominated by the CF-even inner bremsstrahlung process. (C) 2010 Elsevier B.V. All rights reserved.


Page:
301---309


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