K + Physics at J-PARC

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1 Takeshi K. Komatsubara (KEK-IPNS) 1 K + Physics at J-PARC K + Physics at J-PARC Takeshi K. Komatsubara (KEK-IPNS) 2005.May.26 K - RARE Meeting at INFN, Frascati

2 Takeshi K. Komatsubara (KEK-IPNS) 2 K + Physics at J-PARC Outline [in the next 16 slides, 15 minutes] hadron-machine experiments in Japan KEK 12GeV PS ( ) J-PARC (2009 ) Accelerators Hadron Experimental Facility K + -decay at rest program at J-PARC: FCNC rare decay K + π + ν ν T-violation in K + π 0 µ + ν, K + µ + νγ

3 Takeshi K. Komatsubara (KEK-IPNS) 3 K + Physics at J-PARC 12GeV KEK-PS experiments, by K2K (long-baseline ν): data taking completed - E391a (K 0 L π0 ν ν): Run-3 in the autumn? - some nuclear experiments are scheduled. Fast Ext Slow Ext t o ν Beamline East Hall North Hall protons per pulse beam spill 1.1 micro 2.0 sec cycle every 2.2 every 4.0 sec operation in a year months

4 Takeshi K. Komatsubara (KEK-IPNS) 4 K + Physics at J-PARC Japan Proton Accelerator Research Complex JAERI and KEK Joint Project (Japan Atomic Energy Research Institute) at the Tokai site of JAERI 70km north of Narita Airport, 50km northeast of KEK, 80 minutes to drive KEK Tokai campus was established (April 2005)

5 Takeshi K. Komatsubara (KEK-IPNS) 5 K + Physics at J-PARC

6 Takeshi K. Komatsubara (KEK-IPNS) 6 K + Physics at J-PARC

7 Takeshi K. Komatsubara (KEK-IPNS) 7 K + Physics at J-PARC Hadron Exp. Facility Neutrino Exp. Facility

8 Takeshi K. Komatsubara (KEK-IPNS) 8 K + Physics at J-PARC J-PARC 50GeV-PS operation (Slow Ext) KEK-PS AGS J-PARC Phase-1 (mod?) proton energy GeV protons per pulse /spill cycle >4.42 sec average current <3.6 µa beam spill >1.7 sec duty factor >39 % instantaneous rate < /sec

9 Takeshi K. Komatsubara (KEK-IPNS) 9 K + Physics at J-PARC / !" #%$'&)(+*,#%$'&.-

10 K-decay lines: KL line at 16deg and K1.1 line(s-type) or, in the future... Takeshi K. Komatsubara (KEK-IPNS) 10 K + Physics at J-PARC

11 Takeshi K. Komatsubara (KEK-IPNS) 11 K + Physics at J-PARC The show must go on! theoretical motivation: V td in the SM, or beyond the SM impetus for more measurements: 3 events with small (and controlled) bgd, B.R. = ( ) K + decay at rest (low-energy K + ): established and matured with some known limitaions (acceptance,..) potential major upgrades have been discussed since late 80 s (KAON, AGS-2000,...)

12 Takeshi K. Komatsubara (KEK-IPNS) 12 K + Physics at J-PARC detector: solenoidal spectrometer BARREL γ VETO B4 COUNTERS COLLAR COUNTER π + RANGE STACK COLLAR COUNTER K + CERENKOV COUNTER MICRO COLLAR BEAM CHAMBER 1 TARGET BEAM CHAMBER 2 END CAP γ VETO BE-O DEGRADER END CAP γ VETO BARREL γ VETO DRIFT CHAMBER RANGE STACK STRAW CHAMBERS detector R& D s around KEK, including: active degrader (P bw O 4,..) chopped plastic-scintillators Silicon Strip beam counter 500-MHz waveform digitizers

13 Takeshi K. Komatsubara (KEK-IPNS) 13 K + Physics at J-PARC New Spectrometer for breakthroughs (conceptual stage) 2 Tesla spectrometer momentum resolution compact detector fiber stack crystal barrel segmentation goal: more than 50 SM signal events (BR precision 20%)

14 Takeshi K. Komatsubara (KEK-IPNS) 14 K + Physics at J-PARC T-violating P T in K + π 0 µ + ν, K + µ + νγ P T P T s µ + (p π 0 p µ +) p π 0 p µ + : T-odd an observable of CP violation sensitive probe of non-sm CPV P T = ± stat ± syst ( P T < 0.50% ) K µ3 from KEK-E246: PRL 93(2004)

15 Takeshi K. Komatsubara (KEK-IPNS) 15 K + Physics at J-PARC J-PARC T-violation experiment (K + decay at rest) K + v Magnet C- Counter Quad Pb µ + C3 TOF C4 C2 r z (or y) CsI (Tl) Target Polarimeter + e counter + µ stopper Coil r (or y) z Target CsI (Tl) Iron pole + µ stopper e + counter Left e + counters Right e + counters e + µ stopper Trigger counter Fe field trim Cu degrader µ + z TOF counter m Cu degrader r y C4 chamber y (cm) (a) (b) (c) upgrading the E246 apparatus, in an early stage of J-PARC: CsI(Tl) readout additional tracker photon veto system polarimeter system

16 Takeshi K. Komatsubara (KEK-IPNS) 16 K + Physics at J-PARC New Detector for breakthroughs γ -veto and calorimeter Polarimeter Al-plates ACTIVE POLARIMETER SEGMENT Trackers Calorimeter Plastics γ e + K + Degrader γ Central tracker Active target MWPC µ + Preshower detectors Veto counters µ + TRACKER goal: P T 10 4 (E246 was limited by the statistics)

17 Takeshi K. Komatsubara (KEK-IPNS) 17 K + Physics at J-PARC NP Experiments at J-PARC: near-term schedule 2003 Jan 30 LoI s were submitted. Jun Facility Committee s assessment: - Day-1 experiments - Phase-1 experiments (including kaon experiments) 2004 Feb Report on the Beamline Layout plan of the Hadron Exp Hall Jun? Call for full-proposals 2006 Mar? deadline of the Day-1 Proposals 2008 J-PARC first beam?? 2009 Day-1 experiments start??

18 Takeshi K. Komatsubara (KEK-IPNS) 18 K + Physics at J-PARC Summary : K + Physics at J-PARC new Hadron Experimental Facility, under construction K + -decay at rest experiments, with established techniques to control backgrounds, systematics. K1.1 line for lower-energy K + beam (studies in progress), or new K + beam line in future goal: beyond the Standard Model with K + decays

19 Backup Slides Takeshi K. Komatsubara (KEK-IPNS) 19 K + Physics at J-PARC

E10: K + π + ν ν E89,104: K + µ + ν H E99,195: P L in K + µ + ν E137: K 0 L µe K0 L µe direct CPV: ɛ /ɛ K + π + µ + e K + π

20 KEK-PS BNL-AGS FNAL/CERN 1960 Experiments started (32GeV) (the year I was born) K 0 L π+ π 1977 Experiments started (12GeV). E10: K + π + ν ν E89,104: K + µ + ν H E99,195: P L in K + µ + ν E137: K 0 L µe K0 L µe direct CPV: ɛ /ɛ K + π + µ + e K + π + ν ν 1993 Booster E162: K 0 L π+ π e + e E246,470: P T in K + π 0 µ + ν,.. E391a: K 0 L π0 ν ν * 1992 US-Japan kaon program (BNL-E787/E949, FNAL-KTeV) K 0 L rare decays K 0 S decays Takeshi K. Komatsubara (KEK-IPNS) 20 K + Physics at J-PARC

21 K0.8/K1.1 line(c-type) and high-memontum line Takeshi K. Komatsubara (KEK-IPNS) 21 K + Physics at J-PARC

Frascati Physics Series Vol. XVI (2000), pp PHYSICS AND DETECTORS FOR DANE { Frascati, Nov , 1999 BNL E787 results on K +! + Takahiro S

Frascati Physics Series Vol. XVI (2000), pp. 000-000 PHYSICS AND DETECTORS FOR DANE { Frascati, Nov. 16-19, 1999 BNL E787 results on K +! + Takahiro Sato KEK ; High Energy Accelerator Research Organization