Evidence for K{sup +} {r_arrow} {pi}{sup +} {nu}{anti {nu}}

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The decay K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}} has been observed for the first time. The E787 experiment has presented evidence for the K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}} decay, based on the observation of a single clean event from data collected during the 1995 run of the AGS (Alternating Gradient Synchrotron at Brookhaven National Laboratory). The branching ratio indicated by this observation, B(K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}}) = 4.2{sub {minus}3.5}{sup +9.7} {times} 10{sup {minus}10}, is consistent with the Standard Model expectation although the central experimental value is four times larger. The final E787 data sample, from the 1995--99 ... continued below

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10 p.

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Kettell, S.; Collaboration, E787 & Collaboration, E949 December 31, 1998.

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Description

The decay K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}} has been observed for the first time. The E787 experiment has presented evidence for the K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}} decay, based on the observation of a single clean event from data collected during the 1995 run of the AGS (Alternating Gradient Synchrotron at Brookhaven National Laboratory). The branching ratio indicated by this observation, B(K{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}}) = 4.2{sub {minus}3.5}{sup +9.7} {times} 10{sup {minus}10}, is consistent with the Standard Model expectation although the central experimental value is four times larger. The final E787 data sample, from the 1995--99 runs, should reach a sensitivity of about eight times that of the 1995 run alone. A new experiment, E949, has been approved to run, starting in the year 2000, and is expected to achieve a sensitivity of more than an order of magnitude below the prediction of the Standard Model.

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10 p.

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INIS; OSTI as DE99001515

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  • Heavy quarks at fixed target, Batavia, IL (United States), 10-12 Oct 1998

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  • Other: DE99001515
  • Report No.: BNL--66107
  • Report No.: CONF-981066--
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 307901
  • Archival Resource Key: ark:/67531/metadc687308

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 9, 2015, 12:02 p.m.

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Kettell, S.; Collaboration, E787 & Collaboration, E949. Evidence for K{sup +} {r_arrow} {pi}{sup +} {nu}{anti {nu}}, article, December 31, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc687308/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.