Test of exotic scalar and tensor couplings in K+ → π0e+ν decay

S. Shimizu, K. Horie, M. Abe, M. Aoki, I. Arai, Y. Asano, T. Baker, M. Blecher, M. D. Chapman, P. Depommier, M. P. Grigorjev, M. Hasinoff, H. C. Huang, Y. Igarashi, T. Ikeda, J. Imazato, A. P. Ivashkin, J. H. Kang, M. M. Khabibullin, A. N. KhotjantsevY. G. Kudenko, Y. Kuno, J. M. Lee, K. S. Lee, A. S. Levchenko, G. Y. Lim, J. A. Macdonald, C. R. Mindas, O. V. Mineev, S. Sekikawa, H. M. Shimizu, Y. H. Shin, Y. M. Shin, K. S. Sim, A. Suzuki, T. Tashiro, A. Watanabe, D. H. Wright, T. Yokoi

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The form factors of the decay K+ → π0e+ν (K(e3)/+) have been measured with stopped kaons. A Dalitz plot containing 4.1 x 104 events was analyzed. A comparison of the observed Dalitz plot with a Monte Carlo simulation determined the ratio of the strengths of possible scalar and tensor couplings to that of the vector coupling, f(S)/f+(0) = -0.002 ± 0.026(stat) ± 0.014(syst) and f(T)/f+(0) = -0.01 ± 0.14(stat) ± 0.09(syst). These values are consistent with the standard model prediction of zero, and disagree with a previous experiment. The analysis also yielded the coefficient of the q2 term in the vector form factor to be λ+ = 0.0278 ± 0.0026(stat) ± 0.0030(syst). (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)33-41
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 2000 Dec 7

Bibliographical note

Funding Information:
This work was supported in Japan by a Grant-in-Aid from the Ministry of Education, Science, Sports and Culture, and by JSPS; in Russia by the Ministry of Science and Technology, and by the Russian Foundation for Basic Research; in Canada by NSERC and IPP, and by the TRIUMF infrastructure support provided under its NRC contribution; in Korea by BSRI-MOE and KOSEF; in the USA by NSF and DOE; and in Taiwan by NSC. The authors gratefully acknowledge the excellent support received from the KEK staff.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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