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

Authors
Ma, H Appel, R Atoyan, GS Bassalleck, B Bergman, DR Cheung, N Dhawan, S Do, H Egger, J Eilerts, S Fischer, H Herold, W Issakov, VV Kaspar, H Kraus, DE Lazarus, DM Lichard, P Lowe, J Lozano, J Majid, W Menzel, W Pislak, S Poblaguev, AA Rehak, P Sher, A Thompson, JA Truol, P Zeller, ME
Citation
H. Ma et al., New measurement of the rare decay K+ -> pi(+)mu(+)mu(-), PHYS REV L, 84(12), 2000, pp. 2580-2583
Citations number
15
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
12
Year of publication
2000
Pages
2580 - 2583
Database
ISI
SICI code
0031-9007(20000320)84:12<2580:NMOTRD>2.0.ZU;2-7
Abstract
More than 400 K+ --> pi(+) mu(+) mu(-) events were observed in a rare K+ de cay experiment at the Brookhaven Alternating Gradient Synchrotron. Normaliz ed to the K+ --> pi(+) pi(+) pi(-) decay, the branching ratio is determined to be [9.22 +/- 0.60(stat) +/- 0.49(syst)] X 10(-8). This branching ratio and the mu mu mass spectrum is in very good agreement with the measurement of the K+ --> pi(+) e(+) e(-) decay, but deviates significantly from the pr evious measurement.