Measurements of the rare decay K(L) --> e(+)e(-)e(+)e(-)

Measurements of the rare decay K(L) --> e(+)e(-)e(+)e(-)

We observe 441 K(L)-->e(+)e(-)e(+)e(-) candidate events with a background of 4.2 events and measure B(K(L)-->e(+)e(-)e(+)e(-)) = [3.72+/-0.18(stat)+/-0.23(syst)]x10(-8) in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e(+)e(-) pairs, we m...

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Veröffentlicht in:Physical review letters 2001-06, Vol.86 (24), p.5425-5429
Hauptverfasser: Alavi-Harati, A, Alexopoulos, T, Arenton, M, Arisaka, K, Averitte, S, Barker, A R, Bellantoni, L, Bellavance, A, Belz, J, Ben-David, R, Bergman, D R, Blucher, E, Bock, G J, Bown, C, Bright, S, Cheu, E, Childress, S, Coleman, R, Corcoran, M D, Corti, G, Cox, B, Crisler, M B, Erwin, A R, Ford, R, Glazov, A, Golossanov, A, Graham, G, Graham, J, Hagan, K, Halkiadakis, E, Hamm, J, Hanagaki, K, Hidaka, S, Hsiung, Y B, Jejer, V, Jensen, D A, Kessler, R, Kobrak, H G, LaDue, J, Lath, A, Ledovskoy, A, McBride, P L, Mikelsons, P, Monnier, E, Nakaya, T, Nelson, K S, Nguyen, H, O'Dell, V, Pang, M, Pordes, R, Prasad, V, Quinn, B, Ramberg, E J, Ray, R E, Roodman, A, Sadamoto, M, Schnetzer, S, Senyo, K, Shanahan, P, Shawhan, P S, Shields, J, Slater, W, Solomey, N, Somalwar, S V, Stone, R L, Swallow, E C, Taegar, S A, Tesarek, R J, Thomson, G B, Toale, P A, Tripathi, A, Tschirhart, R, Turner, S E, Wah, Y W, Wang, J, White, H B, Whitmore, J, Winstein, B, Winston, R, Yamanaka, T, Zimmerman, E D
Format: Artikel
Sprache:eng
Schlagworte:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DECAY
DISTRIBUTION
FERMILAB
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Zusammenfassung:We observe 441 K(L)-->e(+)e(-)e(+)e(-) candidate events with a background of 4.2 events and measure B(K(L)-->e(+)e(-)e(+)e(-)) = [3.72+/-0.18(stat)+/-0.23(syst)]x10(-8) in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e(+)e(-) pairs, we measure the CP parameters beta(CP) = -0.23+/-0.09(stat)+/-0.02(syst) and gamma(CP) = -0.09+/-0.09(stat)+/-0.02(syst). We also present the first detailed study of the e(+)e(-) invariant mass spectrum in this decay mode.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.86.5425