Search for the decay KL --> pi(0)e+e-

A Alavi-Harati; I F Albuquerque; T Alexopoulos; M Arenton; K Arisaka; S Averitte; A R Barker; L Bellantoni; A Bellavance; J Belz; R Ben-David; 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; M B Crisler; A R Erwin; R Ford; P M Fordyce; A Glazov; A Golossanov; G Graham; J Graham; K Hagan; E Halkiadakis; K Hanagaki; S Hidaka; Y B Hsiung; V Jejer; J Jennings; D A Jensen; R Kessler; H G Kobrak; J LaDue; A Lath; A Ledovskoy; P L McBride; A P McManus; P Mikelsons; E Monnier; T Nakaya; K S Nelson; H Nguyen; V O'Dell; M Pang; R Pordes; V Prasad; C Qiao; B Quinn; E J Ramberg; R E Ray; A Roodman; M Sadamoto; S Schnetzer; K Senyo; P Shanahan; P S Shawhan; W Slater; N Solomey; S V Somalwar; R L Stone; I Suzuki; E C Swallow; R A Swanson; S A Taegar; R J Tesarek; G B Thomson; P A Toale; A Tripathi; R Tschirhart; Y W Wah; J Wang; H B White; J Whitmore; B Winstein; R Winston; T Yamanaka; E D Zimmerman

doi:10.1103/PhysRevLett.86.397

Search for the decay KL --> pi(0)e+e-

Phys Rev Lett. 2001 Jan 15;86(3):397-401. doi: 10.1103/PhysRevLett.86.397.

Authors

A Alavi-Harati¹, I F Albuquerque, T Alexopoulos, M Arenton, K Arisaka, S Averitte, A R Barker, L Bellantoni, A Bellavance, J Belz, R Ben-David, 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, M B Crisler, A R Erwin, R Ford, P M Fordyce, A Glazov, A Golossanov, G Graham, J Graham, K Hagan, E Halkiadakis, K Hanagaki, S Hidaka, Y B Hsiung, V Jejer, J Jennings, D A Jensen, R Kessler, H G Kobrak, J LaDue, A Lath, A Ledovskoy, P L McBride, A P McManus, P Mikelsons, E Monnier, T Nakaya, K S Nelson, H Nguyen, V O'Dell, M Pang, R Pordes, V Prasad, C Qiao, B Quinn, E J Ramberg, R E Ray, A Roodman, M Sadamoto, S Schnetzer, K Senyo, P Shanahan, P S Shawhan, W Slater, N Solomey, S V Somalwar, R L Stone, I Suzuki, E C Swallow, R A Swanson, S A Taegar, R J Tesarek, G B Thomson, P A Toale, A Tripathi, R Tschirhart, Y W Wah, J Wang, H B White, J Whitmore, B Winstein, R Winston, T Yamanaka, E D Zimmerman

Affiliation

¹ University of Arizona, Tucson 85721, USA.

PMID: 11177840
DOI: 10.1103/PhysRevLett.86.397

Abstract

We report on a search for the decay KL-->pi(0)e+e- carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06+/-0.41 events, and we set an upper limit B(KL-->pi(0)e+e-)<5.1 x 10(-10) at the 90% confidence level.