Study of the decay K(L) -> pi+- e-+ nu e+ e- to probe the semileptonic K-pi structure

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The authors observed a new neutral kaon decay mode, K{sub L} {yields} {pi}{sup {+-}}e{sup {-+}}{bar {nu}}e{sup +}e{sup -} for the first time. Based on the 20225 events including 1018 {+-} 25 background events, they determined the branching ratio, B(K{sub L} {yields} {pi}{sup {+-}}e{sup {-+}}{bar {nu}}e{sup +}e{sup -}; M{sub e{sup +}e{sup -}} > 5 MeV/c{sup 2}, E*{sub e{sup +}e{sup -}} > 30 MeV) = (1.281 {+-} 0.041) x 10{sup -5}. This branching ratio agrees with a theoretical prediction based on the chiral perturbation theory ({chi}PT) calculation at {Omicron}(p{sup 4}). Most of the kinematical distributions agree with the {chi}PT {Omicron}(p{sup 4}) calculation. ... continued below

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135 pages

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Kotera, Katsushige & U., /Osaka September 1, 2006.

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The authors observed a new neutral kaon decay mode, K{sub L} {yields} {pi}{sup {+-}}e{sup {-+}}{bar {nu}}e{sup +}e{sup -} for the first time. Based on the 20225 events including 1018 {+-} 25 background events, they determined the branching ratio, B(K{sub L} {yields} {pi}{sup {+-}}e{sup {-+}}{bar {nu}}e{sup +}e{sup -}; M{sub e{sup +}e{sup -}} > 5 MeV/c{sup 2}, E*{sub e{sup +}e{sup -}} > 30 MeV) = (1.281 {+-} 0.041) x 10{sup -5}. This branching ratio agrees with a theoretical prediction based on the chiral perturbation theory ({chi}PT) calculation at {Omicron}(p{sup 4}). Most of the kinematical distributions agree with the {chi}PT {Omicron}(p{sup 4}) calculation. They also measured one of the low energy coupling constants for the {chi}PT {Omicron}(p{sup 4}), L{sub 9}{sup r} = (8.0 {+-} 1.6) x 10{sup -3}. The M{sub e{sup +}e{sup -}} distribution below 100 MeV showed a 3 {sigma} deviation from the {chi}PT {Omicron}(p{sup 4}) calculation. This requires further studies in theory and experiments.

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135 pages

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  • Report No.: FERMILAB-THESIS-2006-19
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 892477
  • Archival Resource Key: ark:/67531/metadc876545

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  • September 1, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 1:03 p.m.

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Kotera, Katsushige & U., /Osaka. Study of the decay K(L) -> pi+- e-+ nu e+ e- to probe the semileptonic K-pi structure, thesis or dissertation, September 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc876545/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.