C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 AMADEUS 32 nd Meeting of the LNF Scientific Committee 31 st May – 1 st June 2006 C. Guaraldo AMAD EU nraveling S A ntikaon M atter A t D A  NE: E xperiments with U nraveling S pectroscopy

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Contents 1.Introduction 2.The case of AMADEUS 3.The framework of the AMADEUS Proposal 4.Realizing AMADEUS 5.Determination of the neutron detection efficiency of the KLOE e.m. calorimeter 6.Implementation of the AMADEUS setup within KLOE 7.Analysis of the Helium data of the KLOE Drift Chamber 8.Conclusions

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Introduction

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Letter of Intent Study of deeply bound kaonic nuclear states at DA  NE2 AMADEUS Collaboration March 2006

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June scientists from 33 Institutes of 13 Countries signed the Letter of Intent

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June The case of AMADEUS

The case of AMADEUS  Problem How the spontaneous and explicit chiral symmetry breaking pattern of low energy QCD changes in the nuclear environment  Approach New type of in-medium hadron mass spectroscopy  Method Producing deeply bound states from which to deduce the hadron-nucleus potential and the in-medium hadron mass How the hadron masses and interactions changes in the nuclear medium

Deeply bound pionic atoms Successful example of deeply bound mesonic states W. Weise, Acta Phys. Pol. B31 (2000) 2715 P. Kienle and T. Yamazaki, Phys. Lett. B514 (2001) 1 P. Kienle, T. Yamazaki, Progress in Particle and Nuclear Physics 52 (2004) 85. Subtle balance at the surface of a heavy nucleus between the Coulomb attraction and the repulsion resulting from the pion-nuclear strong interaction. Deeply bound states in pionic atoms T. Yamazaki, P. Kienle et al., Z. Phys. A355 (1996) 219  Important tool for testing chiral pion-nucleus dynamics and studying partial chiral symmetry restoration

Deeply bound kaonic nuclear states  Deeply bound kaonic nuclear states in presence of a strong KN attractive potential were firstly suggested by Wycech S. Wycech, Nucl. Phys. A450 (1986) 399c  A “new paradigm” in strangeness nuclear physics can be considered the work “Nuclear bound states in light nuclei” by Y. Akaishi and T. Yamazaki Phys. Rev. C65 (2002) Strong attractive I=0 KN interaction favors discrete nuclear states bound MeV and narrow MeV shrinkage effect of a K on core nuclei

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 The KN interaction  Deeply bound kaonic nuclear states require the presence of a strong attractive KN interaction in the isospin I=0 channel However, apparently, from experiments:  S-wave K - nucleon scattering length is negative at threshold  “repulsive type” interaction A.D. Martin, Nucl. Phys. B179 (1981) 33  K  line shift of kaonic hydrogen is negative  “repulsive type” interaction KEK: M. Iwasaki et al., Phys. Rev. Lett. 78 (1997) 3067 DEAR: G. Beer et al., Phys. Rev. Lett. 94 (2005)

Counts/ 60 eV X-ray energy (keV) KK KK KK width  1s  [eV] shift  1s [eV] Davies et al, 1979 Izycki et al, 1980 Bird et al, 1983 repulsive attractive KpX (KEK) M. Iwasaki et al, 1997 DEAR SIDDHARTA  = ± 63 ± 11 eV  = 407 ± 208 ± 100 eV Results on the shift and width for kaonic hydrogen DEAR results: G. Beer et al., Phys.Rev.Lett. 94, (2005)  1s = ± 37(stat) ± 6(syst) eV  1s = 249 ± 111(stat) ± 30(syst) eV klk X-ray energy (keV)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 In-medium effects on the dynamics of the  (1405)  If the s-wave, isospin I=0  (1405) resonance is dominantly a KN bound state  the actual K - p interaction is attractive although it appears repulsive in the scattering length and the K  energy shift of kaonic hydrogen

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 In-medium effects on the dynamics of the  (1405) strong non-linear density dependence of optical potential: repulsion in free space attraction in nuclear matter  this comes from experiments: result of a systematic phenomenological re-analysis of kaonic atoms data E. Friedmann, A. Gal and C.J. Batty, Phys. Lett. B308 (1993) 6; Nucl. Phys. A579 (1994) 518.  mechanism: Pauli principle on proton weakening of binding   (1405) mass shift up to threshold influence of the nuclear medium on  (1405) formation

Fig. 1. Real (dashed lines) and imaginary parts (solid lines) of the K - p scattering amplitude in nuclear matter at different values of the Fermi momentum p F = (3π 2 ρ/2 )1/3, as a function of the total c.m. energy √s. a) free space, p F = 0; b) ~ 0.2 ρ 0, p F = 150 MeV/c; c) ~ 1.4 ρ 0, p F = 300 MeV/c; ρ 0 = 0.17 fm -3 Influence of the nuclear medium (Pauli blocking) on the formation of the Λ(1405) K - p threshold In free space, at threshold, point A, a K - p <0  repulsive interaction In nuclear matter at rather low density (  0.2  0 ), at threshold, point B, a K - p >0  attractive interaction 1432 B A T. Waas, N. Kaiser, W. Weise, Phys. Lett. B 365 (1996) 12

Role of a bound state below threshold The behavior of the K - p potential is a phenomenon well known in nuclear physics  Simple arguments from low-energy scattering show that the existence of a bound state below threshold always leads to a repulsive scattering length. M.A. Preston and R.K. Badhuri, Structure of the nucleus, Addison-Wesley, Reading, Massachusetts, 1974  Analogy between the K - p scattering in the I=0 channel and the proton-neutron (p-n) scattering in the deuteron channel (I=0, S=1): the interaction between the proton and neutron is attractive, but the scattering length in the deuteron channel (I=0, S=1) is repulsive, due to the existence of the deuteron as a bound state. In nuclear matter, however, the deuteron disappears, largely due to Pauli blocking, and the true attractive nature of the p-n interaction emerges.

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June The framework of the AMADEUS Proposal

The framework of the AMADEUS Proposal  Experiments Present: KEK E471, E549, E570 DA  NE FINUDA GSI FOPI analyses of the recently collected data are in progress Future: new data from FOPI, FINUDA and JPARC  Theory -Debate in progress, including alternative interpretations of the data so far obtained - Another “kaonic hydrogen puzzle” – like story? until new reliable experimental results are on the market?

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 AMADEUS philosophy/ strategy  The only way to confirm, or deny, the exotic states is to perform a good measurement using a high performance detector on the most suitable accelerator a measurement NOT performed until now complete determination of all formation and decay channels binding energies, partial and total widths, angular momenta, isospin, sizes, densities, etc  Detection of charged particles, neutrons and photons up to about 800 MeV/c in 4  geometry Requirements satisfied by the performance of the KLOE detector

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Realizing AMADEUS

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Realizing AMADEUS  determination of the neutron detection efficiency of the KLOE e.m. calorimeter  Implementation of the AMADEUS setup within KLOE  Analysis of the KLOE Drift Chamber Helium data

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Determination of the neutron detection efficiency of the KLOE e.m. calorimeter

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 K He  (ppnK - ) + n The (pnnK - ) kaonic cluster may decay through the following channels: (ppnK - )   + d   + np    + pp    + d    + np with the  and  ’s decaying according to PDG. Strange tribaryon formation

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 P(p) GeV/c P(  ) GeV/c P(n) GeV/c Neutrons produced in the tribaryon decay channel  pn (“continuous” component) have momenta starting from few tens MeV/c till about 600 MeV/c (energy about 180 MeV) The ejected primary neutrons in the formation process (“monochromatic” component) have a momentum of about 510 MeV/c (energy about 140 MeV). Range of interest of neutron energies

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006  MonteCarlo simulations AMADEUS MonteCarlo GEANT simulation (and FLUKA MonteCarlo from KLOE)  Measurement with a neutron beam KLOE+AMADEUS experimental test of a prototype of the KLOE calorimeter on the neutron beam of TSL (Uppsala): KLONE proposal Determination of the KLOE calorimeter efficiency for neutrons

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 AMADEUS Technical Note IR-1, 4 March 2006 M. Cargnelli STEFAN MEYER Institute for Subatomic Physics, Vienna, Austria C. Curceanu Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy A prelimnary GEANT MonteCarlo simulation of the KLOE calorimeter: extraction of the efficiency for neutron detection

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 KLOE calorimeter

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 One quarter of the calorimeter was modelled, the azimuthal angle 0-90 degrees was subdivided in 6 modules. Each module consisted of a lead converter with an inner radius of ~ 200 cm and ~ 23 cm width. The total length was 4,3 m. In these 6 volumes the fibres were placed as copies of cylindrical volumes with 1 mm diameter, by taking the tangential pitch of 1.35 mm and the radial pitch of 1.2 mm. The calorimeter MC model

The neutrons were started isotropically from the centre of the apparatus (the beam interaction point). The neutron momentum was sampled uniformly between MeV/c. The sum of deposited energies in the fibres (starting from 0 ‘no signal generated’) of one module was histogrammed versus the incoming neutron energy. GEANT 3.21 simulation - inputs The values are given for 2 lower thresholds of the deposited energy: 3 and 1 MeV. Only signal produced by protons was taken into account. The ratio of the number of neutrons depositing energy versus the total number of incoming neutrons gives the intrinsic efficiency.

GEANT 3.21 simulation example of events

GEANT 3.21 simulation – example of events

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Threshold at 1 MeV Threshold at 3 MeV MonteCarlo simulation - Calorimeter response Neutron detection efficiency

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Results in agreement with FLUKA dedicated simulations performed by KLOE. Refined MonteCarlo simulations to understand details (topology, etc.) are undergoing.

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Test of a calorimeter prototype on a neutron beam: KLOE + AMADEUS, mixed team of ~ 15 persons, lead by Stefano Miscetti Measurement of the neutron efficiency using a test beam

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 KLONE (KLOe NEutrons) formal request to TSL in April 2006 Stefano Miscetti and Catalina Curceanu Funded with European Transnational Access budget of TSL within the FP6 HadronPhysics Project The KLONE proposal at TSL (Uppsala)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 The KLOE calorimeter prototype for KLONE: - dimensions: ~ 25 x 13 x 60 cm 3, instrumented on both sides (32 PMs in total) - cut from a prototype of the KLOE calorimeter

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006

Neutrons are produced in the Blue Hall of TSL by the 7 Li(p,n) reaction. The proton beam can be varied in the MeV range. The resulting neutron energy distribution is such that half of the neutrons are concentrated within 1-2 MeV, at few MeV below the incident proton energy. The remaining neutrons are roughly equally distributed in energy from zero up to the maximum neutron energy. After passage through the production target, the proton beam is deflected in a magnet and dumped far away from the testing area to minimize background. The TSL neutron beam at Uppsala (1)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Neutrons emitted in the forword direction pass through a collimator consisting of iron rings of various diameters, such that any neutron beam diameter from zero up to 30 cm, in steps of 5 cm, can be accomplished. The testing position can be chosen anywhere from just after the collimator up to 10 m away from it (where the neutron beam is 130 cm diameter). The neutron beam facility is equipped with a fission based monitor, which provides a flux measurement with 10% absolute precision. The TSL neutron beam at Uppsala (2)

KLONE setup Blue Hall at TSL and neutron beam

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June May 2006: visit at TSL and discussions with TSL staff for details: -checked the beam quality compatibility with the goal of the measurement – OK -checked the geometry of Blue Hall and possible positioning of setup – OK -checked the control room availability – OK -assured participation and support from TSL staff Performed actions

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 KLONE Project at TSL - approved on 18/05/2006  code F183 assigned - beam time allocated in October 2006: week 42 and 43 in Frequency Modulation (FM) mode ( MeV energy range)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006  Preparation of the KLONE setup will start in July (when setup at disposal)  Test of the setup at LNF – until October 2006 – optimization  October 2006: transportation and measurements at TSL Future working plan

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Implementation of the AMADEUS setup within KLOE

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 KLOE – EMC KLOE – Drift Chamber Possible setup for AMADEUS within KLOE: Cryogenic target Inner tracker Kaon trigger AMADEUS setup within KLOE

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 There are presently 2 versions: - without a vertex/inner tracking detector (minimal version) - with a vertex/inner tracker detector AMADEUS setup

The same in both versions with half toroidal cryogenic target optimal solution for a kaon trigger system, consisting of: two cylindrical inner-layer scintillating fibres detectors: x-y position within ± 1mm due to an angle of 60° between the two layers three half cylindrical outer-layer scintillating fibres detectors with inner and outer scintillating fibres layers a track reconstruction is possible, therefore with the magnetic field of KLOE K + and K - are distinguishable The kaon trigger

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 half-toroidal cryogenic target cell 1 st inner-layer of scintillating fibre fiber size: 1x1mm 2 2 nd inner-layer of scintillating fibre fiber size: 1x1mm 2 three outer-layers of scintillating fibre fiber size: 1x1mm 2 AMADEUS setup-minimal version (with the collaboration of Vincenzo Patera)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 We need the position of the K - stop = primary vertex Then the kaon tracker might be essential (under study) Second version of AMADEUS setup

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 KLOE and AMADEUS had few meetings in which the vertex/inner tracking detector was discussed A common solution is emerging: location of the detector in such a way that both KLOE and AMADEUS can use it Technical solutions (type of detector) and plans for prototyping and testing are being discussed and under evaluation AMADEUS setup- second version (in collaboration with KLOE - for vertex detector)

A tracking/vertex detector (a Time Projection Chamber (TPC) with GEM-readout in this example) is surrounding the half toroidal cryogenic target cell with the (previous) kaon trigger configuration. Alternative, if the background rate is too high (to be checked with FINUDA inner-tracker) a multi-layer cylindrical GEM detector is in discussion: might be necessary AMADEUS setup- second version (in collaboration with KLOE - for vertex detector)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 two TPC sections with triple GEM and x-y readout on both sides kaon trigger made of 2+3 scintillating fibers layers, inside a vacuum chamber half-toroidal cryogenic target cell vacuum chamber thin-walled beam pipe AMADEUS setup second version

In case of low background it is possible to use a full toroidal cryogenic target cell In this case, the kaon trigger is made of: two inner-layers of scintillating fibres: x-y determination due to the crossing of the fibre-layers with an angle of 60° two outer-layers of scintillating fibres: x-y determination due to the crossing of the fibre-layers with an angle of 60° additional fast timing information for charged particles – background suppression for inner tracking detector (TPC+GEM) AMADEUS setup- second version (in collaboration with KLOE - for vertex detector)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 full toroidal cryogenic target cell vacuum chamber thin-walled beam pipe 2 outer-layer of scintillating fibre fiber size: 1x1mm 2 kaon trigger: 2 inner-layer of scintillating fibre fiber size: 1x1mm 2 AMADEUS setup with full toroidal cryogenic target cell

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Cryogenic toroidal target cell: working temperature: K working pressure: < 2 bar thin-walled design: 75µm Kapton, with aluminum grid reinforcement (grid transmission > 85 %) inner diameter: 110 mm outer diameter: 210 mm inner length: 120 mm outer length: 200 mm

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 production rate for charged kaon pairs R = L  b = 1500 s -1 peak luminosity 3 × cm 2  production cross section cm -2 s -1 produced K ± per month: 31 × 10 8 (80% duty cycle assumed) 40% are stopped in the cryogenic He gas target (15% liq. He density, ~ 5 cm thick)  12.5 × 10 8 K - 4 He atoms per month for cluster formation yield: 12.5 × 10 5 kaonic clusters formed in one month  Efficiency of tracking & identification K ± & detection of decay products  ~ 10 5 events per month (~ 1000 pb -1 ) 0.49 branching ratio for K ± Results of preliminary MonteCarlo simulations for AMADEUS setup with optimized degrader and cryotarget

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Data analysis of 2 fb -1 KLOE data

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Data analysis of the 2 fb -1 KLOE data to search for kaonic nuclear clusters produced in the reaction 4 He(K - stopped, nucleon)

E471 KEK results 4 He(K - stopped, p) and 4 He(K - stopped, n) missing mass spectra M. Iwasaki et al., nucl-ex/ v2

Preliminary Monte Carlo simulations shows that with 2 fb -1 one might have > 1500 K - stopped events in Helium of KLOE Drift Chamber, of the type: and > 500 events of the type AMADEUS group  willing to help KLOE in data analysis K He -> n + (K - ppn) n ~ 510 MeV/c (assuming  n ~ 30%) K He -> p + (K - pnn) p ~ 550 MeV/c Pre-experiment: Proposal to KLOE 31th LNF Scientific Committee CC,JZ / Nov. 29, 2005

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June )Refined MCarlo simulations with the AMADEUS code 2)AMADEUS officially accepted in the Kcharged group of KLOE 3)Mixed team KLOE-AMADEUS got formed and started to work 4)Training of AMADEUS team by the KLOE Kcharged team 5)KLOE MCarlo dedicated production and start analysis 6)Plan for data analysis What happened in the last months:

Schematic side view of the KLOE detector e+e+ e-e- K+K+ The drift chamber is filled with He + isobutane at atmospheric pressure; He as active volume K- K- p K - pnn KLOE detector

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006    K - 4 He ppnK npnnK p  d  n p   p p   d   n p  n n  n p n p   d   n n  n   n   p            Measure 1 particle of a 2-body decay. Transform to cms of the decaying Object. Gives 2nd particle properties. Missing mass spectroscopy Measure all outgoing particles to obtain the total cms energy = invariant mass of the object Reaction channels (simplified)

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Monte Carlo simulation: events P(   ) GeV/c K He n + (K - ppn)  np P(p) GeV/c P(  ) GeV/c P(p) GeV/c P(n) GeV/c

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 (blue) dotted line for gammas (red) solid line for charged particles (except muons) (black) blank/dotted line for neutral hadrons or neutrinos (green) dashed line for muons (yellow) dotted line for Cerenkov photons AMADEUS MonteCarlo: to get the K - stopped in Helium of DC

KLOE Drift chamber Events / bin z-position (mm)radial-position (mm) K ± entering chamber K - stopped in the chamber z = beam direction collision zone:  z = 30 mm ~ 0.3% stopped in the gas of the chamber K- stopped in Helium

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Kaon production rate: ~ 150 K - s -1 (for L ~10 32 cm -2 s -1 ) N = L  b = 2.9 × fb -1 = 2 × cm -2 integrated luminosity 0.49 branching ratio for K ± Total number of produced charged kaon pairs for L = 2 fb -1 ~ 0.3% stopped in the gas of the chamber  3 × × 2.9 × 10 9 = 8.8 × 10 6 K - 4 He atoms For a cluster yield of we have ~ 8800 clusters Without efficiency of tracking & identification of K +/- &detection of decay products 3 × cm 2  production cross section AMADEUS MonteCarlo: K-clusters in existing KLOE data

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 A group of 5 persons from AMADEUS: - Paul Buehler - Michael Cargnelli - Catalina Curceanu - Dorel Pietreanu - Diana Sirghi started to work under the supervision and in strict contact with Vincenzo Patera and Erika De Lucia (Kcharged team of KLOE) AMADEUS officially accepted in the K charged team of KLOE

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June March 2006 – training course for AMADEUS team held by KLOE (Vincenzo Patera & Erika de Lucia): - Overall view of KLOE and its data stream; - Presentation of the Monte Carlo and the real data structure; - Dedicated Monte Carlo production strategy – modified from KLOE MCarlo; - Exercises to better understand the process; - Start elaborating a strategy of MCarlo analyses Moreover, a dedicated afs area on KLOE computing farm, under KLOE Kcharged group, was created for these analyses. Start working on analysis (1):

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Actions: - Start dedicated MonteCarlo Ntuple production (10 million of events); - Start to learn how to treat the data in order to obtain: the final number of stopped kaons; optimization of the strategy of data analysis and learn how to treat the final data (how to “tag”, what to ask in order to have enhanced recognition of the kaonic nuclear clusters, efficiencies, background, etc.) Start working on analysis (2):

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 ~ 0.3% K - stopped in the gas of the chamber  3 × × 2.9 × 10 9 = 8.8 × 10 6 K - 4 He atoms For a cluster yield of we have ~ 8800 kaonic clusters Taking into account: Efficiency of tracking & identification K ± & detection of decay products  ~ reconstructed kaonic clusters Preliminary results:

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Finalize KLOE dedicated MCarlo analysis and implement the dedicated kaonic cluster physics (from AMADEUS MCarlo) -Start preliminary analysis of the final data (on a small data set) in order to understand background and to calibrate the strategy of overall data analysis -Start massive real data analyses in strict contact and under the supervision of KLOE team, as soon as data will be available for analyses Future plans:

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June Conclusions

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Conclusions (1) 1.The AMADEUS Collaboration aims to perform the most complete experimental effort ever done so far in searching for deeply bound kaonic nuclear clusters using, for the first time, a 4  dedicated detector capable of detecting all charged and neutral particles created in both formation and decay of kaonic clusters. The goal is to definitely clarify their debated existence.

C. Guaraldo - 32 nd Meeting of LNF Scientific Committee, 31 st May -1 st June 2006 Conclusions (2) 2.To realise the programme, the AMADEUS setup - cryogenic target, kaon trigger, vertex/inner tracker - must be implemented within the KLOE detector. The use of the KLOE calorimeter as neutron detector is as well compelling and implies the determination of the neutron detection efficiency. 3.A successful collaboration between the KLOE and AMADEUS teams has been already established and a common work is in progress. “Conditio sine qua non” for the realization of the programme.