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Pislak S, Appel R, Atoyan GS, et al. New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0). Phys Rev Lett. 2001;87(22):221801doi: 10.1103/PhysRevLett.87.221801.
Pislak, S., Appel, R., Atoyan, G. S., Bassalleck, B., Bergman, D. R., Cheung, N., Dhawan, S., Do, H., Egger, J., Eilerts, S., Herold, W., Issakov, V. V., Kaspar, H., Kraus, D. E., Lazarus, D. M., Lichard, P., Lowe, J., Lozano, J., Ma, H., Majid, W., Poblaguev, A. A., Rehak, P., Sher, A., Thompson, J. A., Truöl, P., & Zeller, M. E. (2001). New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0). Physical review letters, 87(22), 221801. https://doi.org/10.1103/PhysRevLett.87.221801
Pislak, S, et al. "New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0)." Physical review letters vol. 87,22 (2001): 221801. doi: https://doi.org/10.1103/PhysRevLett.87.221801
Pislak S, Appel R, Atoyan GS, Bassalleck B, Bergman DR, Cheung N, Dhawan S, Do H, Egger J, Eilerts S, Herold W, Issakov VV, Kaspar H, Kraus DE, Lazarus DM, Lichard P, Lowe J, Lozano J, Ma H, Majid W, Poblaguev AA, Rehak P, Sher A, Thompson JA, Truöl P, Zeller ME. New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0). Phys Rev Lett. 2001 Nov 26;87(22):221801. doi: 10.1103/PhysRevLett.87.221801. Epub 2001 Nov 07. PMID: 11736394.
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Phys Rev Lett. 2001 Nov 26;87(22):221801. doi: 10.1103/PhysRevLett.87.221801. Epub 2001 Nov 07.

New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0).

Physical review letters

S Pislak, R Appel, G S Atoyan, B Bassalleck, D R Bergman, N Cheung, S Dhawan, H Do, J Egger, S Eilerts, W Herold, V V Issakov, H Kaspar, D E Kraus, D M Lazarus, P Lichard, J Lowe, J Lozano, H Ma, W Majid, A A Poblaguev, P Rehak, A Sher, J A Thompson, P Truöl, M E Zeller

Affiliations

  1. Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland.

PMID: 11736394 DOI: 10.1103/PhysRevLett.87.221801

Abstract

A sample of 4 x 10(5) events from the decay K(+)-->pi(+)pi(-)e(+)nu(e) (K(e4)) has been collected in experiment E865 at the Brookhaven Alternating Gradient Synchrotron. The analysis of these data yields new measurements of the K(e4) branching ratio [(4.11+/-0.01+/-0.11) x 10(-5)], the s-wave pi pi scattering length [a(0)(0) = 0.216+/-0.013(stat)+/-0.004(syst)+/-0.005(theor)], and the form factors F, G, and H of the hadronic current and their dependence on the invariant pi pi mass.

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