First Observation of the DecayKL→π0e+e−γ

Autor: A. R. Barker, P. Mikelsons, E. Monnier, M. D. Corcoran, K. S. Nelson, J. Hamm, R. E. Ray, R. J. Tesarek, B. Quinn, J. Wang, R. Ben-David, E. C. Swallow, J. Whitmore, Eva Halkiadakis, V. Prasad, H. G.E. Kobrak, Douglas Bergman, G. Graham, A. Bellavance, S. E. Turner, K. Arisaka, Gordon Thomson, S. Hidaka, B. Cox, J. LaDue, T. Yamanaka, Y. W. Wah, R. Winston, H. B. White, K. Senyo, G. J. Bock, V. Jejer, P. L. McBride, S. A. Taegar, E. Blucher, V. O'Dell, S. Bright, Sunil Somalwar, Theodoros Alexopoulos, M. B. Crisler, J. Belz, K. Hagan, T. Nakaya, S. Childress, T. Uchizawa, M. Sadamoto, P. A. Toale, Stephen Schnetzer, A. Golossanov, A. Ledovskoy, K. Hanagaki, W. Slater, N. Solomey, P. Shanahan, A. Alavi-Harati, R. Pordes, G. Corti, C. Bown, B. Winstein, A. Glazov, R. L. Stone, M. Pang, M. Arenton, I. Suzuki, Elliott Cheu, E. D. Zimmerman, L. Bellantoni, R. Tschirhart, J. Graham, H. Nguyen, J. Shields, D. A. Jensen, Y. B. Hsiung, S. Averitte, A. R. Erwin, R. Kessler, R. Coleman, E. J. Ramberg, A. Roodman, A. Tripathi, P. S. Shawhan, Amitabh Lath, R. Ford
Rok vydání: 2001
Předmět:
Zdroj: Physical Review Letters. 87
ISSN: 1079-7114
0031-9007
DOI: 10.1103/physrevlett.87.021801
Popis: We report on the first observation of the decay K{sub L}{yields}{pi}{sup 0}e{sup +}e{sup -} {gamma} by the KTeV E799 experiment at Fermilab. Based upon a sample of 48events with an estimated background of 3.6{+-}1.1 events, we measure the K{sub L}{yields}{pi}{sup 0}e{sup +}e{sup -} {gamma} branching ratio to be (2.34{+-}0.35{+-}0.13) x 10{sup -8} . Our data agree with recent O(p{sup 6}) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter a{sub V} . A fit was made to the K{sub L}{yields}{pi}{sup 0}e{sup +}e{sup -} {gamma} data for a{sub V} with the result -0.67{+-}0.21{+-}0.12 , which is consistent with previous results from KTeV.
Databáze: OpenAIRE
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