Rare K sup + decays in flight: Latest results and future plans

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E777 at the Brookhaven AGS has published a final branching ratio limit for the lepton family violating decay K{sup +} {yields} {pi}{sup +}{mu}{sup +}e{sup {minus}} of 2.1 {times} 10{sup {minus}10} (90% C.L.). New results based on approximately 500 events of the G.I. M. suppressed decay K{sup +} {yields} {pi}{sup +}e{sup +}e{sup {minus}} have yielded a branching ratio of (2.75 {plus minus} 0.23 {plus minus} 0.13) {times} 10{sup {minus}7} assuming a vector interaction with, a form factor = 0.105 {plus minus} 0.035 {plus minus} 0.015. The branching ratio times decay probability for K{sup 0} {yields} {pi}{sup +} X{sup 0}, ,{sup 0} ... continued below

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Alliegro, C.; Zeller, M.E. (Yale Univ., New Haven, CT (United States)); Campagnari, C. (Chicago Univ., IL (United States)); Chaloupka, V.; Lubatti, H.J.; Zhao, T. (Washington Univ., Seattle, WA (United States)) et al. January 1, 1991.

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E777 at the Brookhaven AGS has published a final branching ratio limit for the lepton family violating decay K{sup +} {yields} {pi}{sup +}{mu}{sup +}e{sup {minus}} of 2.1 {times} 10{sup {minus}10} (90% C.L.). New results based on approximately 500 events of the G.I. M. suppressed decay K{sup +} {yields} {pi}{sup +}e{sup +}e{sup {minus}} have yielded a branching ratio of (2.75 {plus minus} 0.23 {plus minus} 0.13) {times} 10{sup {minus}7} assuming a vector interaction with, a form factor = 0.105 {plus minus} 0.035 {plus minus} 0.015. The branching ratio times decay probability for K{sup 0} {yields} {pi}{sup +} X{sup 0}, ,{sup 0} {yields} e{sup +}e{sup {minus}} was found to less than 1.5 {times} 10{sup {minus}8} (99% C.L.) in the e{sup +}e{sup {minus}} invariant mass range of 150 to 340 MeV/c. An approved second generation experiment sensitive to K{sup +} {yields} {mu}{sup +}e{sup {minus}} at the 10{sup {minus}12} level is discussed. 5 refs., 3 figs.

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Pages: (4 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Particles and fields '91, Vancouver (Canada), 18-22 Aug 1991

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  • Other: DE92000484
  • Report No.: BNL-46517
  • Report No.: CONF-910881--13
  • Grant Number: AC02-76CH00016
  • Grant Number: AC02-76ER03075
  • Office of Scientific & Technical Information Report Number: 5179416
  • Archival Resource Key: ark:/67531/metadc1060285

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 5, 2018, 1:31 p.m.

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Alliegro, C.; Zeller, M.E. (Yale Univ., New Haven, CT (United States)); Campagnari, C. (Chicago Univ., IL (United States)); Chaloupka, V.; Lubatti, H.J.; Zhao, T. (Washington Univ., Seattle, WA (United States)) et al. Rare K sup + decays in flight: Latest results and future plans, article, January 1, 1991; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1060285/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.