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The future of the E391a experiment

The future of the E391a experiment. G.Y.Lim IPNS,KEK. 質量起源と超対称性物理の研究 筑波大、 2003 年 3 月 4 日. Goal Sensitivity < 10 -13 Standard Model events > 100 Dh / h < 5 %. Precise measurement of Br(K L g p 0 nn ). Direct CP violation ( D s =1) Clean measurement of Im(V td ) ～ h

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The future of the E391a experiment

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  1. The future of the E391a experiment G.Y.Lim IPNS,KEK 質量起源と超対称性物理の研究 筑波大、2003年3月4日

  2. Goal Sensitivity < 10-13 Standard Model events > 100 Dh/h < 5 % Precise measurement of Br(KLgp0nn) Direct CP violation (Ds =1) Clean measurement of Im(Vtd)～h Kaon unitarity triangle Clue for the new physics BR(KLgponn) L. Littenberg E731 E799 KTeV E391a SM Expectation KOPIO JHF Year Practical test of the methodology by the E391a

  3. For the high sensitivity experiment Smooth extension (E391a JHF) High flux of KL 500 times larger KL Flux 3 orders higher sensitivity Sufficient background rejection Same principle of beamline Minor up-grade of detector Background study at the E391a T.InagakiCP Violation in K (1998)

  4. Experiment at the JHF Construction an extraction line (B-line) Concentration on KL production Difficult to become time-zero experiment - budgetary condition / other programs Share the target station (A-line) Prompt starting option

  5. Prompt starting option • Merit and Demerit • We can share the beam • Prompt access the SM expectation • Clearer understanding the BG • Make sure for precise measurement • Large angle smaller KL flux • Condition • Proton energy : 30 GeV • Proton intensity : 2・1014 • Production angle : 16o • Rough Estimation • Proton intensity : 100 • Production yield : 0.9 • Beam acceptance :0.25 • Beam line optimization : 0.7 • Longer data taking : 6 • Repetition time : 1.21 10 SM events for 3 Yr.

  6. Summary • Smooth extension to the JHF • Step-by-step approach to theKLgp0nn decay • Additional two stages of experiment • Finally we will measure the Br(KLgp0nn) with accuracy less than 10% • Contribute the CPV study • Search for new physics effects • LOI for the JHF locates at http://psux1.kek.jp/~e391/documents/paper/loi-jhf.pdf

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