Search for the KL-->pi 0 pi 0 e+e- decay in the KTeV experiment

A Alavi-Harati; T Alexopoulos; M Arenton; K Arisaka; S Averitte; R F Barbosa; A R Barker; M Barrio; L Bellantoni; A Bellavance; J Belz; D R Bergman; E Blucher; G J Bock; C Bown; S Bright; E Cheu; S Childress; R Coleman; M D Corcoran; G Corti; B Cox; A R Erwin; R Ford; A Glazov; A Golossanov; G Graham; J Graham; E Halkiadakis; J Hamm; K Hanagaki; S Hidaka; Y B Hsiung; V Jejer; D A Jensen; R Kessler; H G E Kobrak; J LaDue; A Lath; A Ledovskoy; P L McBride; P Mikelsons; E Monnier; T Nakaya; K S Nelson; H Nguyen; V O'Dell; R Pordes; V Prasad; X R Qi; B Quinn; E J Ramberg; R E Ray; A Roodman; S Schnetzer; K Senyo; P Shanahan; P S Shawhan; J Shields; W Slater; N Solomey; S V Somalwar; R L Stone; E C Swallow; S A Taegar; R J Tesarek; G B Thomson; P A Toale; A Tripathi; R Tschirhart; S E Turner; Y W Wah; J Wang; H B White; J Whitmore; B Winstein; R Winston; T Yamanaka; E D Zimmerman

doi:10.1103/PhysRevLett.89.211801

Search for the KL-->pi 0 pi 0 e+e- decay in the KTeV experiment

Phys Rev Lett. 2002 Nov 18;89(21):211801. doi: 10.1103/PhysRevLett.89.211801. Epub 2002 Oct 31.

Authors

A Alavi-Harati¹, T Alexopoulos, M Arenton, K Arisaka, S Averitte, R F Barbosa, A R Barker, M Barrio, L Bellantoni, A Bellavance, J Belz, D R Bergman, E Blucher, G J Bock, C Bown, S Bright, E Cheu, S Childress, R Coleman, M D Corcoran, G Corti, B Cox, A R Erwin, R Ford, A Glazov, A Golossanov, G Graham, J Graham, E Halkiadakis, J Hamm, K Hanagaki, S Hidaka, Y B Hsiung, V Jejer, D A Jensen, R Kessler, H G E Kobrak, J LaDue, A Lath, A Ledovskoy, P L McBride, P Mikelsons, E Monnier, T Nakaya, K S Nelson, H Nguyen, V O'Dell, R Pordes, V Prasad, X R Qi, B Quinn, E J Ramberg, R E Ray, A Roodman, S Schnetzer, K Senyo, P Shanahan, P S Shawhan, J Shields, W Slater, N Solomey, S V Somalwar, R L Stone, E C Swallow, S A Taegar, R J Tesarek, G B Thomson, P A Toale, A Tripathi, R Tschirhart, S E Turner, Y W Wah, J Wang, H B White, J Whitmore, B Winstein, R Winston, T Yamanaka, E D Zimmerman

Affiliation

¹ University of Wisconsin, Madison, Wisconsin 53706, USA.

PMID: 12443402
DOI: 10.1103/PhysRevLett.89.211801

Abstract

The recent discovery of a large CP violating asymmetry in KL-->pi+pi-e+e- mode has prompted us to seach for the associated KL-->pi 0 pi 0 e+e- decay mode in the KTeV-E799 experiment at Fermilab. In 2.7 x 10(11) K(L) decays, one candidate event has been observed with an expected background of 0.3 event, resulting in an upper limit for the KL-->pi 0 pi 0 e+e- branching ratio of 6.6 x 10(-9) at the 90% C.L.