New measurement of the properties of the rare decay K+->pi(+)e(+)e(-)

Authors
Appel, R Atoyan, GS Bassalleck, B Bergman, DR Brown, DN Cheung, N Dhawan, S Do, H Egger, J Eilerts, S Felder, C Fischer, H Gach, M Herold, W Issakov, VV Kaspar, H Kraus, DE Lazarus, DM Leipuner, L Lichard, P Lowe, J Lozano, J Ma, H Majid, W Menzel, W Pislak, S Poblaguev, AA Postoev, VE Proskurjakov, AL Rehak, P Robmann, P Sher, A Thomas, TL Poblaguev, AA Postoev, VE Proskurjakov, AL Rehak, P Robmann, P Sher, A Thomas, TL Thompson, JA Truol, P Weyer, H Zeller, ME
Citation
R. Appel et al., New measurement of the properties of the rare decay K+->pi(+)e(+)e(-), PHYS REV L, 83(22), 1999, pp. 4482-4485
Citations number
23
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
22
Year of publication
1999
Pages
4482 - 4485
Database
ISI
SICI code
0031-9007(19991129)83:22<4482:NMOTPO>2.0.ZU;2-X
Abstract
A low-background sample of 10 300 events has been collected for the decay m ode K+ --> pi(+)e(+)e(-) experiment E865 at the Brookhaven Alternating Grad ient Synchrotron. The branching ratio is measured to be [2.94 +/- 0.05(stat ) +/- 0.13(syst) +/- 0.05(model)] x 10(-7), the vector nature of this decay is firmly established, and the decay form factor f(z) = f(0)(1 + delta z)( z = M-ee(2)/m(K)(2)) is determined to have delta = 2.14 +/- 0.13 +/- 0.15, The experiment is described and results discussed in the context of chiral perturbation theory.