update on kaon kink spectra n.
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Update on Kaon (Kink) Spectra

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Update on Kaon (Kink) Spectra

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  1. Update on Kaon (Kink) Spectra • K+/K- Ratio • Assumption: Everything is symmetric • Only Background subtraction might go wrong • Extensive systematic tests of ratio stability vs cuts • Still a couple of checks to go • Ratio comes always in range 1.16 – 1.18 • The lowest best value if we clean background at low pt using dE/dx info S. Margetis

  2. Kink Ratio (2) • VERY soon we will be ready to publish the ratio • With proper errors • We migh want to wait a couple of weeks to re-check this with the new production. S. Margetis

  3. Ratio all dedx Ratio all pt S. Margetis

  4. dedx dedx S. Margetis

  5. Ratio Hijing S. Margetis

  6. Ratio dE/dx S. Margetis

  7. Yields • Data shown at QM were 00m production using 00i embedding corrections • Since a couple of weeks ago a new PSF embedding is available on 00m • Also Wen did some on his own here at RCF • Overall efficiency went down ~30-40% • It does not affect spectra slopes (still ~280 MeV) • It results in remarkable agreement with dE/dx (F.Wang) • Things we checked so far are all compatible except the ratio Associated-kaon-decays-in-fiducial/All-kaon-decays-in-fiducial S. Margetis

  8. pt S. Margetis

  9. mt mt S. Margetis

  10. dN/dy S. Margetis

  11. Yields • Checks will continue but • If not ‘bug’ is found in 00i then we are in trouble believeving our efficiency correction method • K0s would help settling this issue in an independent way • More really soon…… S. Margetis