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AMADEUS: Status Report C. Curceanu and O. Vazquez Doce for the AMADEUS collaboration

AMADEUS: Status Report C. Curceanu and O. Vazquez Doce for the AMADEUS collaboration 22 November, LNF-INFN 35 th LNF Scientific Committee. Preliminary KLOE data analyses by the AMADEUS group Oton Vazquez Doce 2) AMADEUS PHASE-1: PHYSICS, SETUP AND ROLL-IN PROPOSAL

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AMADEUS: Status Report C. Curceanu and O. Vazquez Doce for the AMADEUS collaboration

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  1. AMADEUS: Status Report C. Curceanu and O. Vazquez Doce for the AMADEUS collaboration 22 November, LNF-INFN 35th LNF Scientific Committee

  2. Preliminary KLOE data analyses by the AMADEUS group • Oton Vazquez Doce • 2) AMADEUS PHASE-1: • PHYSICS, SETUP AND ROLL-IN PROPOSAL • Catalina Curceanu

  3. Preliminary KLOE data analysisin the search for Kaonic Nucleiby the AMADEUS collaboration Oton Vázquez Doce 35th LNF Scientific Committee November 22, 2007

  4. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce

  5. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis • Total amount of data analyzed up to an integrated luminosity of 400 pb-1from KLOE data (K-charged group) • Special ntuples of KLOE data were created, with kaons tagged by 2-body decay or by the dE/dx signature in the DC gas. • Strategy: • Search for hadronic interactions with Λ(1116) as products: • Λ→ p + p-(64% BR) vertex made by KLOE reconstruction • Construct a vertex with Λ + an extra particle

  6. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis • Lambda selection criteria: Λ→ p + p- • Search for vertices (by KLOE reconstruction) inside the Drift Chamber: • negative particle: p- identified by low dE/dx in DC gas • protons: • protons with EMC-cluster associated

  7. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis For protons, if no cluster associated, require: track reaching the calorimeter region + “proton signature” in the dE/dx of DC gas protonswithout EMC-cluster + protons with EMC-cluster For more details: KLOE memo 337 pions

  8. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Lambda invariant massΛ→ p + p- • Flat background • Gaussian describing the resonance • 2nd Gaussian to account for E.loss • in the DC wall Fit σ = 0. 398 ± 0.005 MeV/c2 Minv = 1115,717 ± 0. 004 MeV/c2 PDG: MΛ= 1115,683 ± 0.006 MeV/c2

  9. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Lambda invariant massΛ→ p + p- • Flat background • Gaussian describing the resonance • 2nd Gaussian to account for E.loss • in the DC wall Fit σ = 0. 398 ± 0.005 MeV/c2 • Split data sample: • ρ < 35 cm • → Λ from the DC inner wall • ρ > 35 cm • → Λ from the DC volume Minv = 1115,717 ± 0. 004 MeV/c2 PDG: MΛ= 1115,683 ± 0.006 MeV/c2

  10. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Lambda invariant massΛ→ p + p- Minv = 1115,722 ± 0. 005 MeV/c2 σ = 0. 398 ± 0.005 MeV/c2 31203 events ρ < 35 cm Λs from DC inner wall PΛ(MeV/c) Minv=1115,704 ± 0. 009 MeV/c2 σ = 0. 382 ± 0.011 MeV/c2 5878 events ρ > 35 cm Λs from DC vol. PΛ(MeV/c) Minv pπ(MeV/c2)

  11. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-PROTON analysis Introduction LAMBDA selection Lambda-DEUTERON analysis Deeply Bound Kaonic States formation process K-stopped +4He→ n + n + (K-pp)

  12. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-PROTON analysis Introduction LAMBDA selection Lambda-DEUTERON analysis K-stopped +4He→ n + n + (K-pp) Λ+ p p +π-

  13. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce p p ? Λ Lambda-PROTON analysis Introduction LAMBDA selection Lambda-DEUTERON analysis K-stopped +4He→ n + n + (K-pp) Λ+ p p +π-

  14. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce p p ? Λ Lambda-PROTON analysis Introduction LAMBDA selection Lambda-DEUTERON analysis K-stopped +4He→ n + n + (K-pp) Λ+ p • Search for the proton with first DC measurement around the lambda vertex (30 cm. cylinder) • Vertex lambda+proton assumption p +π- • Proton is required to have an associated cluster in the EMC and its mass is measured by time of flight.

  15. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce p p ? Λ Lambda-PROTON analysis Introduction LAMBDA selection Lambda-DEUTERON analysis K-stopped +4He→ n + n + (K-pp) Λ+ p Mproton(MeV/c2) • Search for the proton with first DC measurement around the lambda vertex (30 cm. cylinder) • Vertex lambda+proton assumption p +π- • Proton is required to have an associated cluster in the EMC and its mass is measured by time of flight. Pproton(MeV/c)

  16. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Invariant mass Λ p analysis 1156 events ρ < 35 cm DC inner wall 2Mp+Mp- 2Mp+MK 215 events ρ > 35 cm DC vol. MinvΛp(MeV/c2)

  17. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Invariant mass correlations Λ p analysis ρ < 35 cm (DC inner wall) Mn+Mn+Mp0 Missing mass From 4He+K- (Mev/c2) cosθ < -0.8 (back to back) Angular correlation Cos θ (Λp) MinvΛp(MeV/c2)

  18. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Invariant mass correlations Λ p analysis ρ > 35 cm (DC volume) Mn+Mn+Mp0 Missing mass From 4He+K- (Mev/c2) cosθ < -0.8 (back to back) Angular correlation Cos θ (Λp) MinvΛp(MeV/c2)

  19. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Introduction LAMBDA selection Lambda-PROTON analysis Lambda-DEUTERON analysis Invariant mass Λ p analysis total Events 1156 back to back 379 ρ < 35 cm (DC inner wall) 2Mp+Mπ- 2Mp+MK Total Yield = 0.03% BtB Yield = 0.01% (per stopped K-) Back to back (cos θ < -0.8) total Events 215 back to back 86 ρ > 35 cm (DC volume) 2Mp+MK Total Yield = 0.04% BtB Yield = 0.01% (per stopped K-) 2Mp+Mπ- MinvΛp(MeV/c2)

  20. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis Deeply Bound Kaonic States formation process K-stopped +4He→ n + (K-ppn) Tri-baryonic state possible decay channels: K-ppn Λd Λnp Σ0d Σ-pp Σ0np

  21. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis Deeply Bound Kaonic States formation process K-stopped +4He→ n + (K-ppn) Tri-baryonic state possible decay channels: K-ppn Λd Λnp Σ0d Σ-pp Σ0np

  22. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce p p ? Λ Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis K-stopped +4He→ n + (K-ppn) Λ+ d • Search for the deuteron with first DC measurement around the lambda vertex (30 cm. cylinder) • Vertex lambda+deuteron assumption p + π- • Deuteron is required to have an associated cluster in the EMC and its mass is measured by time of flight.

  23. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Mdeuteron(MeV/c2) Mdeuteron(MeV/c2) • Search for the deuteron with first DC measurement around the lambda vertex (30 cm. cylinder) • Vertex lambda+deuteron assumption • Search for the deuteron with first DC measurement around the lambda vertex (30 cm. cylinder) • Vertex lambda+deuteron assumption p p ? Λ Pdeuteron(MeV/c) Pdeuteron(MeV/c) Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis K-stopped +4He→ n + (K-ppn) Λ+ d • Search for the deuteron with first DC measurement around the lambda vertex (30 cm. cylinder) • Vertex lambda+deuteron assumption p + π- • Deuteron is required to have an associated cluster in the EMC and its mass is measured by time of flight.

  24. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis Invariant mass Λ d analysis 156 events ρ < 35 cm DC inner wall Md + Mp+ MK Md+ Mp+ Mp- 23 events ρ > 35 cm DC vol. MinvΛd(MeV/c2)

  25. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis Invariant mass correlations Λ d analysis ρ < 35 cm (DC inner wall) Missing mass From 4He+K- (Mev/c2) Angular correlation Cos θ (Λp) cosθ < -0.8 (back to back) MinvΛd(MeV/c2)

  26. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis Invariant mass correlations Λ d analysis ρ > 35 cm (DC volume) Missing mass From 4He+K- (Mev/c2) Angular correlation Cos θ (Λp) cosθ < -0.8 (back to back) MinvΛd(MeV/c2)

  27. KLOE data analysis by AMADEUS collaboration Oton Vázquez Doce Lambda-DEUTERON analysis Introduction LAMBDA selection Lambda-PROTON analysis Invariant mass Λ d analysis 156 total Events 69 back to back ρ < 35 cm (DC inner wall) Md+Mp+Mp- Total Yield = 0.004% BtB Yield = 0.002% (per stopped K-) Md+Mp+MK Back to back (cos θ < -0.8) ρ > 35 cm (DC volume) 23 total Events 12 back to back Total Yield = 0.004% BtB Yield = 0.002% (per stopped K-) Md+Mp+MK Md+Mp+Mp- MinvΛd(MeV/c2)

  28. AMADEUS global strategy: AMADEUS phase-1: start end 2009 (after KLOE2 step0), study di- and tri – baryon kaonic nuclei and low-energy kaon-nucleon/nuclei interactions AMADEUS phase-2: after 2010, higher integrated luminosity, refine study of di- tri-baryon kaonic nuclei; extend to other nuclei (spectroscopy of kaonic nuclei along the periodic table…)

  29. AMADEUS collaboration: 119 scientists from 13 Countries and 34 Institutes (+ JINR)

  30. Contents • The AMADEUS Phase –1: Scientific case • The AMADEUS phase-1 experimental setup • Monte Carlo simulations • AMADEUS Phase-1: luminosity request, implementation plan and proposal for the roll-in • Conclusions

  31. The scientific case of the so-called “deeply bound kaonic nuclear states” is hotter than ever, both in the theoretical (intensive debate) and experimental sectors. What emerges is the strong need for a complete experimental study of the scientific case, i.e. a clear and clean experiment, measuring kaonic clusters both in formation and in the decay processes. AMADEUS’s main aim is to perform the first full acceptance, high precision measurement of DBKNS both in formation and in the decay processes, by implementing the KLOE detector with an inner AMADEUS-dedicated setup, containing a cryogenic target and a trigger system,

  32. information on the modification of the kaon mass and • on KN interaction in a nuclear medium, important for • the further understanding of aspects of low-energy QCD in strangeness sector; • gain information on the QCD phase-diagram •  changes of vacuum properties of QCD and the quark • condensate • kaon condensation in a nuclear medium •  implication on astrophysics: • neutron stars, strange stars • nuclear dynamics under extreme conditions could be • investigated (e.g. nuclear compressibility) DBKNS physic (existent or not!) related to fundamental physics issues

  33. Experimental programmeAMADEUS phase-1 (1) • study of the (most) fundamental antikaon deeply bound nuclear systems, the • kaonic dibaryon states: ppK- and (pnK-) • produced in a 3He gas target, in formation and decay processes • as next step, the • kaonic 3-baryon states: ppnK- and pnnK- • produced in a 4He gas target, in formation and decay processes

  34. n-detection: KLONE: NIM. A 581, 368 (2007) Results of KLOE data analyses (L, Lp, Ld)

  35. Experimental programmeAMADEUS phase-1 (2) • Low-energy charged kaon cross sections on Helium(3 and 4), for K- momentum lower than 100 MeV/c (missing today); • The K- nuclear interactions in Helium reactions (poorly known – based on one paper from 1970 …) • Properties of L(1116) and chargedS–for example decays in channels with neutrino -> astrophysics implications (cooling of compact stars) • Resonance states as the elusive-in-nature but so important L(1405) or the S(1385)could be better understood with high statistics; their behaviour in the nuclear mediumcan be studied too.

  36. AMADEUS @ KLOE, phase-1

  37. AMADEUS @ KLOE, phase-1

  38. AMADEUS @ KLOE, phase-1 Low-mass cryogenic gas target cell: T = 10 K P = 1.0 bar Rin = 5 cm Rout = 15 cm L = 20 cm Kaon trigger: two layers of scint. fibers, stereo angel = 30° readout on both sides with SiPM

  39. SIDDHARTA Cryogenic target cell Working T 22 K Working P 2.0 bar Alu-grid Side wall: Kapton 50 µm Kaon entrance Window: Kapton 50 µm

  40. Trigger test:Scintillating Fibers and APDs:- tests are undergoing in SMI Vienna- BTF test in January 2008:FOPI - test

  41. Technical items needing special attention• The beam pipe: we plan to develop (with KLOE and DAFNE) a technical solution which should be easy to extract/implement. Special attention will be dedicated to the mechanical supports.• Cryogenic target: dedicated studies not only for the target itself,but for its mechanical supports and cooling power needed and how to bring the cryogeny inside.• Trigger system: a technical solution for the trigger system, including the optimization of geometry and cabling.• Slow controls: we study the slow control system (to be complemented to the KLOE one) for the specific AMADEUS items.• DAQ: software and hardware. We are aware and started already to collaborate with KLOE on the item of DAQ needs, from software and hardware points of view. We will rely on KLOE solution for the software, eventually developing dedicated on-line and (mostly) off-line analyses and Monte Carlo simulations, the hardware should be care of AMADEUS, with expertize from KLOE.

  42. Monte Carlo simulation

  43. 20% of all K- stop inside target

  44. Monte Carlo simulation:Momenta for particles from chain:K- 4He -> (K-pp) + n(K-pp) -> Ldwith BE = 120 MeVG = 24 MeVWell accessible for KLOEBackground under studyTo be integrated with KLOE MC

  45. Luminosity request, implementation plan and proposal for the roll-in

  46. Number of events in the “golden channel” K-4He --> (K-pp) + n with (K-pp) --> Ld 20% Stopped kaons Y = 0.1 % for DBKNS formation BR to decay to this channel: 10% (with L-> pp-) For 2 fb-1 integrated luminosity the number of events: 2 fb-1 x 3 mb x 0.5 (Kch) x 0.2 (stop) x 0.001 (y) x 0.1 (BR) = 60000 ev detection efficiency (20-40%) -> 12000 – 24000 events Neutron efficiency (30%) -> 3600 – 7200 eventsfor which both missing and invariant mass can be reconstructed, allowing so to have a complete information regarding the formation and decay of DBKNS in light systems.

  47. The luminosity request for AMADEUS Phase-1 is: • 2 fb-1of integrated luminosity with He4 target in order to study the tribaryonDBKNS • 1-2 fb-1of integrated luminosity with He3 target in order to study the dibaryon DBKNS • 0.5 fb-1of integrated luminosity for low-energy kaon-nuclear dedicated measurements for an overall integrated luminosity of 3.5 - 4 fb-1 With the luminosity upgrade of DAFNE, the machine should deliver at least 600pb-1/month, which means that the overall AMADEUS Phase-1 program could becompleted in about 8 months (considering installation).

  48. Implementation plan and roll-in proposal (1) • Cryogenic Target preparation:a first prototype will be built and tested within2008; the final target will be built and tested in the first half of 2009. • Trigger system: a first prototype containing 20 fibers read at both ends by APDs,is being prepared and will be tested on BTF in early 2008; a second prototype, withgreater dimensions and two layers , will be built and tested at BTF within 2008; thefinal detector will be designed and built within first half of 2009. • Beam pipe: a mixed team KLOE-DAFNE-AMADEUS will study this delicateditem and will provide technical solution for the beam pipe and its mechanical sup-port;the beam pipe for AMADEUS will be ready in the first half of 2009.

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