arxiv: 1212.3131 · v2 · pith:PNPEAC7Lnew · submitted 2012-12-13 · ✦ hep-ex

Measurement of the branching ratio of the decay Xi⁰rightarrow Sigma⁺ μ⁻ bar{ν}_{μ}

J.R. Batley , G.E. Kalmus , C. Lazzeroni , D.J. Munday , M. Patel , M.W. Slater , S.A. Wotton , R. Arcidiacono

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G. Bocquet A. Ceccucci D. Cundy N. Doble V. Falaleev L. Gatignon A. Gonidec P. Grafstrom W. Kubischta F. Marchetto I. Mikulec A. Norton B. Panzer-Steindel P. Rubin H. Wahl E. Goudzovski P. Hristov V. Kekelidze V. Kozhuharov L. Litov D. Madigozhin N. Molokanova Yu. Potrebenikov S. Stoynev A. Zinchenko E. Monnier E.C. Swallow R. Winston R. Sacco A. Walker W. Baldini P. Dalpiaz P.L. Frabetti A. Gianoli M. Martini F. Petrucci M. Scarpa M. Savrie A. Bizzeti M. Calvetti G. Collazuol E. Iacopini M. Lenti G. Ruggiero M. Veltri M. Behler K. Eppard M. Eppard A. Hirstius K. Kleinknecht U. Koch L. Masetti P. Marouelli U. Moosbrugger C. Morales Morales A. Peters R. Wanke A. Winhart A. Dabrowski T. Fonseca Martin M. Velasco G. Anzivino P. Cenci E. Imbergamo G. Lamanna P. Lubrano A. Michetti A. Nappi M. Pepe M.C. Petrucci M. Piccini M. Valdata C. Cerri F. Costantini R. Fantechi L. Fiorini S. Giudici I. Mannelli G. Pierazzini M. Sozzi C. Cheshkov J.B. Cheze M. De Beer P. Debu G. Gouge G. Marel E. Mazzucato B. Peyaud B. Vallage M. Holder A. Maier M. Ziolkowski S. Bifani C. Biino N. Cartiglia M. Clemencic S. Goy Lopez E. Menichetti N. Pastrone W. Wislicki H. Dibon M. Jeitler M. Markytan G. Neuhofer L. Widhalm

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keywords rightarrowsigmamathrmbackgroundbeambranchingcandidatescern-sps

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From the 2002 data taking with a neutral kaon beam extracted from the CERN-SPS, the NA48/1 experiment observed 97 $\Xi^{0}\rightarrow \Sigma^{+} \mu^{-} \bar{\nu}_{\mu}$ candidates with a background contamination of $30.8 \pm 4.2$ events. From this sample, the BR($\Xi^{0}\rightarrow \Sigma^{+} \mu^{-} \bar{\nu}_{\mu}$) is measured to be $(2.17 \pm 0.32_{\mathrm{stat}}\pm 0.17_{\mathrm{syst}})\times10^{-6}$.

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Measurement of the branching ratio of the decay Xi⁰rightarrow Sigma⁺ μ⁻ bar{ν}_{μ}

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