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KOPIO Capabilities: Other Physics Goals

KOPIO Capabilities: Other Physics Goals. Measuring Rare Kaon Decays with KOPIO. 24 June 2005 Michael Sivertz BNL. KOPIO Capabilities. Hermetic Veto Coverage for both charged particles and photons High precision Shashlyk Calorimetry for EM Showers in Calorimeter

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KOPIO Capabilities: Other Physics Goals

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  1. KOPIO Capabilities:Other Physics Goals Measuring Rare Kaon Decays with KOPIO 24 June 2005 Michael Sivertz BNL

  2. KOPIO Capabilities • Hermetic Veto Coverage for both charged particles and photons • High precision Shashlyk Calorimetry for EM Showers in Calorimeter • Precision Charged Particle Tracking in Preradiator • Time-of-Flight measurement for Kaon Momentum • High Intensity Kaon Beam giving sensitivity corresponding to 1014 KL decays

  3. Decay modes with a po Analysis of the decay mode KL po S with S unobserved can simultaneously be used in a search for decays to a sGoldstino (superpartners of Goldstone fermions) that could be a Scalar weakly interacting boson. Current limits from E-949: B(K+ p+ S) < 5.9 x 10-11 Look for the Pseudoscalar sGoldstino in KL popo P Limit from ISTRA for Mp<200 MeV/c2 B(K- p-po P) <9 x 10-6 200 100 0 P*(po) MeV/c 0 100 200 Eg1 – Eg2 (MeV)

  4. KL pog g and KL popog KL pog g gives information on the CP allowed contribution to KLpoe+e-. KTEV gives a result of ~10-7 for the Br. If KOPIO can deal with the popo background, then we should be able to add to this result. B(KL popog) < 5.6 x 10-6 from NA31. Conflicting predictions: Heiliger and Sehgal predict 10-8 Ecker, Neufeld and Pich predict 7 x 10-11 KOPIO should be able to improve on the existing limit.

  5. Radiative Decays:KL gg, KL gg*KL g*g*KL ggg At what rate we can accept radiative decays without compromising rare decay modes?

  6. po –po scattering length fromKLpopopo decays NA48 measured (N. Cabibbo, 2005) rescattering of popo in 2 x 108 K+p+popo decays. Observed a cusp in the m2 plot. From this they were able to obtain S-wave scattering lengths. KOPIO hopes to be able to add to this. (a0-a2)mp=0.281±0.007(stat)±0.014(syst)±0.014(theo) mpopo in K+p+popo

  7. KL beta decay Current predictions for KL K e n are ~10-8. Look for K+p+po with a po vertex that is displaced, with back-to-back pions, and a very low energy electron. Background from KL p+po e n has energetic electrons and narrow pion opening angle. Beta decay rate is proportional to Dm5 where Dm is the KL-K+ mass difference. Measurement of the beta decay rate could yield a KL-K+ mass difference to ~10keV

  8. Tagged po decays and KL Lifetime KOPIO anticipates accumulating data on ~1014 kaon decays. This will include a large sample of 2po and 3po decays. Tagging these podecays will allow improved measurements of e.g. po  e+e- (6.2 ± 0.5) x 10-8 po  n n <1.7 x 10-6 KL lifetime is measured to ~1%. The large sample of K decays may allow for a higher precision result from KOPIO.

  9. Summary Lots of possibilities for new physics and improved precision measurement with the anticipated KOPIO data set. Looking for new collaborators to help us with the physics program and build the detector to accomplish these goals. New ideas welcome!

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