Study of the Rare Hyperon Decay ${\boldmath \Omega^\mp \to \Xi^\mp \: \pi^+\pi^-}$

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The authors report a new measurement of the decay {Omega}{sup -} {yields} {Xi}{sup -} {pi}{sup +}{pi}{sup -} with 76 events and a first observation of the decay {bar {Omega}}{sup +} {yields} {bar {Xi}}{sup +} {pi}{sup +}{pi}{sup -} with 24 events, yielding a combined branching ratio (3.74{sub -0.56}{sup +0.67}) x 10{sup -4}. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with {Beta}({Omega}{sup -} {yields} {Xi}{sup -} {pi}{sup +}{pi}{sup -}) = 4.04{sub -0.71}{sup +0.83} x 10{sup -4} and {Beta}({bar {Omega}}{sup +} {yields} {bar {Xi}}{sup +} {pi}{sup +}{pi}{sup -}) = 3.15{sub ... continued below

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Kamaev, O.; Solomey, N.; Burnstein, R.A.; Chakravorty, A.; CHen, Y.C.; Choong, W.S. et al. July 27, 2010.

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The authors report a new measurement of the decay {Omega}{sup -} {yields} {Xi}{sup -} {pi}{sup +}{pi}{sup -} with 76 events and a first observation of the decay {bar {Omega}}{sup +} {yields} {bar {Xi}}{sup +} {pi}{sup +}{pi}{sup -} with 24 events, yielding a combined branching ratio (3.74{sub -0.56}{sup +0.67}) x 10{sup -4}. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with {Beta}({Omega}{sup -} {yields} {Xi}{sup -} {pi}{sup +}{pi}{sup -}) = 4.04{sub -0.71}{sup +0.83} x 10{sup -4} and {Beta}({bar {Omega}}{sup +} {yields} {bar {Xi}}{sup +} {pi}{sup +}{pi}{sup -}) = 3.15{sub -0.89}{sup +1.12} x 10{sup -4}. Contrary to theoretical expectation, they see little evidence for the decays {Omega}{sup -} {yields} {Xi}*{sub 1530}{sup 0} {pi}{sup -} and {bar {Omega}}{sup +} {yields} {bar {Xi}}*{sub 1530}{sup 0} {pi}{sup +} and place a 90% C.L. upper limit on the combined branching ratio {Beta}({Omega}{sup -}({bar {Omega}}{sup +}) {yields} {Xi}*{sub 1530}{sup 0} ({bar {Xi}}*{sub 1530}{sup 0}){pi}{sup {-+}}) < 7.0 x 10{sup -5}.

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  • Report No.: FERMILAB-PUB-10-260
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 984602
  • Archival Resource Key: ark:/67531/metadc1012371

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  • July 27, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 24, 2017, 9:49 p.m.

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Kamaev, O.; Solomey, N.; Burnstein, R.A.; Chakravorty, A.; CHen, Y.C.; Choong, W.S. et al. Study of the Rare Hyperon Decay ${\boldmath \Omega^\mp \to \Xi^\mp \: \pi^+\pi^-}$, article, July 27, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1012371/: accessed January 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.