Measurement of the Decay K{sub L} {r_arrow} {pi}{sup 0}{gamma}{gamma}

Elliott Cheu,S. A. Taegar,Jun-Qiang Wang,K. Arisaka,J. Jennings,W. E. Slater,A. K. Tripathi, H. G. E. Kobrak,R. A. Swanson,E. Blucher,C. Bown,S. Bright,G. Graham, J. Graham,Richard Kessler, Emmanuel Monnier,V. Prasad,C. Qiao,B. Quinn, A. Roodman,P. Shawhan,N. Solomey,E. C. Swallow,Y. W. Wah, B. Winstein,Roland Winston,E. D. Zimmerman,A. R. Barker, J. LaDue, P. Mikelsons, U. Nauenberg, P. A. Toale,J. Y. Wu, L. Bellantoni,R. Ben-David,G. J. Bock,S. Childress,R. Coleman,M. B. Crisler,R. Ford,Y. B. Hsiung, D. A. Jensen, Patricia McBride, Tsuyoshi Nakaya, H. Nguyen, V. O`Dell, M. Pang, Ruth Pordes, E. J. Ramberg, R. E. Ray,P. Shanahan, R. Tschirhart, H. B. White, J. Whitmore, Kazunori Hanagaki, S. Hidaka, M. Sadamoto, K. Senyo, I. Suzuki, T. Yamanaka, A. Bellavance, Corcoran, Ivone F. M. Albuquerque, S. Averitte,John Belz, Douglas Bergman,Eva Halkiadakis,Amitabh Lath, Steve Schnetzer, S. Somalwar, R. L. Stone, R. J. Tesarek, Gordon Thomson, Michael Wayne Arenton, G. Corti, Bradley Cox, A. Golossanov, K. Hagan, V. Jejer,Alexander Ledovskoy, A. P. McManus, K. S. Nelson, A. Alavi-Harati

Physical Review Letters（1999）

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摘要

We report on a new measurement of the decay K{sub L}{r_arrow}{pi}{sup 0}{gamma}{gamma} by the KTeV experiment at Fermilab. We determine the K{sub L}{r_arrow}{pi}{sup 0}{gamma}{gamma} branching ratio to be (1.68{plus_minus}0.07{plus_minus}0.08){times}10{sup {minus}6} . Our data show the first evidence for a low-mass {gamma}{gamma} signal as predicted by recent O(p{sup 6}) chiral perturbation calculations which include vector meson exchange contributions. From our data, we extract a value for the effective vector coupling a{sub V}={minus}0.72{plus_minus}0.05{plus_minus}0.06 . {copyright} {ital 1999} {ital The American Physical Society }

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