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Abouzaid, E; Arenton, M; Barker, A R; Bellantoni, L; Bellavance, A; Blucher, E; Bock, G J; Cheu, E; Coleman, R; Corcoran, M D; Corti, G; Cox, B; Erwin, A R; Escobar, C O; Glazov, A; Golossanov, A; Gomes, R A; Gouffon, P; Hanagaki, K; Hsiung, Y B; Huang, H; Jensen, D A; Kessler, R; Kotera, K; Ledovskoy, A; McBride, P L; Monnier, E; Nelson, K S; Nguyen, H; Niclasen, R; Ping, H; Qi, X R; Ramberg, E J; Ray, R E; Ronquest, M; Santos, E; Shields, J; Slater, W; Smith, D; Solomey, N; Swallow, E C; Toale, P A; Tschirhart, R; Velissaris, C; Wah, Y W; Wang, J; White, H B; Whitmore, J; Wilking, M; Winstein, B; Winston, R; Worchester, E T; Worchester, M; Yamanaka, T; Zimmerman, E D; Zukanovich, R F
Physical review letters, 2006-Mar-17, Letnik: 96, Številka: 10Journal Article
Using the complete KTeV data set of 5,241 candidate K(L)--> pi(+) pi(-) e(+) e(-) decays (including an estimated background of 204 +/- 14 events), we have measured the coupling g(CR)= 0.163 +/- 0.0149(stat) +/- 0.023(syst) of the CP conserving charge radius process and from it determined a K(0) charge radius of <r(2)(K(0))> = -0.077 +/- 0.007(stat) +/- 0.011(syst)fm(2). We have determined a first experimental upper limit of 0.04 (90% C.L.) /g(e1)/ / /g(M1)/ of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of /g(M1)/ including a vector form factor /g(M1)/(1 + (a(1)/a(2))/((M(2)(p)-(M(2)(k))= 2M(K)E(gamma*)), where vector /g(M1)/= 1.11+/- 0.12(stat) +/- 0.08(syst) and a(1)/a(2) = -0.744 +/- 0.027(stat) +/- 0.032(syst) GeV(2)/c(2). Finally, a CP-violating asymmetry of 13.6 +/- 1.4(stat) +/- 1.5(syst)% in the CP and T odd angle phi between the decay planes of the e(+) e(-) and pi(+) pi(-) pairs in the K(L) center of mass is reported.
