Higher-statistics measurement of the branching ratio for the decay K sub L sup 0 r arrow. mu. mu

• Published in: Physical review. D, Particles and fields Vol. 44:1
• Main Authors: Heinson, A.P., Horvath, J., Mathiazhagan, C., Molzon, W.R., Arisaka, K., Cousins, R.D., Kaarsberg, T., Konigsberg, J., Rubin, P., Slater, W.E., Wagner, D.L., Kinnison, W.W., Lee, D.M., McKee, R.J., Milner, E.C., Sanders, G.H., Ziock, H.J., Knibbe, P., Urheim, J., Biery, K.A., Diwan, M.V., Irwin, G.M., Lang, K., Margulies, J., Ouimette, D.A., Schwartz, A., Wojcicki, S.G., Auerbach, L.B., Belz, J., Buchholz, P., Highland, V.L., McFarlane, W.K., Sivertz, M., Ritchie, J.L., Yamashita, A., Chapman, M.D., Eckhause, M., Ginkel, J.F., Hancock, A.D., Kane, J.R., Kenney
• Format: Journal Article
• Language: English
• Published: United States 01-07-1991
• Subjects: 645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties; 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; ACCURACY; BASIC INTERACTIONS; BOSONS; BRANCHING RATIO; DECAY; ELEMENTARY PARTICLES; HADRONS; INTERACTIONS; KAONS; KAONS NEUTRAL; LEPTONIC DECAY; MESONS; PARTICLE DECAY; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PSEUDOSCALAR MESONS; STRANGE MESONS; STRANGE PARTICLES; WEAK INTERACTIONS; WEAK PARTICLE DECAY
• ISSN: 0556-2821; 1089-4918
• DOI: 10.1103/PhysRevD.44.R1

With a significant increase in experimental sensitivity, we have observed an additional 281 {ital K}{sub {ital L}}{sup 0}{r arrow}{mu}{mu} events after a background subtraction of 19{plus minus}6 events. Normalizing this sample to the simultaneous observation of the decay {ital K}{sub {ital L}}{sup 0}{r arrow}{pi}{sup +}{pi}{sup {minus}}, we obtain the branching ratio {ital B}({ital K}{sub {ital L}}{sup 0}{r arrow}{mu}{mu})=(7.6{plus minus}0.5(stat){plus minus}0.4(syst)){times}10{sup {minus}9}. Combining these data with our previously published sample containing 87 events yields {ital B}({ital K}{sub {ital L}}{sup 0}{r arrow}{mu}{mu})=(7.0{plus minus}0.5){times}10{sup {minus}9}.