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Friday, December 10, 2010

Studies of antikaon interactions with nucleons at DA Φ NE. Oton Vázquez Doce LNF - INFN. Friday, December 10, 2010. DA Φ NE AMADEUS KLOE data analysis. Colosseo 70–80 AD Ø 545 m. 17 km. DA Φ NE 2008 AD (upgrade) Ø 200 m.

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Friday, December 10, 2010

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  1. Studies of antikaon interactions with nucleons at DAΦNE Oton Vázquez Doce LNF - INFN Friday, December 10, 2010

  2. DAΦNE AMADEUS KLOE data analysis Colosseo 70–80 AD Ø 545 m 17 km DAΦNE 2008AD (upgrade) Ø 200 m • K‐N interactions @ DAΦNE Oton Vázquez Doce

  3. DAΦNE AMADEUS KLOE data analysis The DAΦNE e+e- collider • e+ e- beams at ~ 500 MeV/c • Φ → K+ K- (49.1%) • Monochromatic low-energy K- (~127 MeV/c) • Low hadronic background due to beam characteristics (compared with hadron beam lines, as KEK) DAΦNE upgrade in 2008 Design of new interaction region scheme Top luminosity reached during SIDDHARTA run: 4x1032 pb-1 s-1 • K‐N interactions @ DAΦNE Oton Vázquez Doce • K‐N interactions @ DAΦNE Oton Vázquez Doce

  4. DAΦNE AMADEUS KLOE data analysis next talk in this session by S. Okada Experimental timeline at DAΦNE DEAR kaonic hydrogen past KLOE CP violation FINUDA hypernuclei present SIDDHARTA kaonic atoms KLOE2 proposal for the future (KLOE2+) SIDDHARTA2* AMADEUS* kaonic nuclei • K‐N interactions @ DAΦNE Oton Vázquez Doce

  5. DAΦNE AMADEUS KLOE data analysis How deep is the KN potential? KLOE DC • K‐N interactions @ DAΦNE Oton Vázquez Doce

  6. A hadron physics important and unresolved topic: • How the hadronic masses and interaction change in nuclear medium DAΦNE AMADEUS: kaonic clusters KLOE data analysis • K‐N interactions @ DAΦNE Oton Vázquez Doce

  7. A hadron physics important and unresolved topic: • How the hadronic masses and interaction change in nuclear medium DAΦNE AMADEUS: kaonic clusters KLOE data analysis • Discussion triggered by the prediction of the Deeply bound kaonic nuclear states • Strong attractive I=0 KN interactionfavors • discrete nuclear stateshigh Band small Γ. • Y. Akaishi and T. Yamazaki (Phys. Rev. C65 (2002) 044005) • K‐N interactions @ DAΦNE Oton Vázquez Doce

  8. A hadron physics important and unresolved topic: • How the hadronic masses and interaction change in nuclear medium DAΦNE AMADEUS: kaonic clusters KLOE data analysis • Discussion triggered by the prediction of the Deeply bound kaonic nuclear states • Strong attractive I=0 KN interactionfavors • discrete nuclear stateshigh Band small Γ. • Y. Akaishi and T. Yamazaki (Phys. Rev. C65 (2002) 044005) Deeply bound kaonic nuclear states require the presence of a strong attractive KN interaction in the isospin I=0 channel From experimental data: • S-wave K-nucleon scattering • length is negative at threshold “repulsive type” interaction • K line shift of kaonic • hydrogen is negative KN potential strongly dependent on density: → repulsive in free space → attractive in nuclear matter • K‐N interactions @ DAΦNE Oton Vázquez Doce

  9. DAΦNE AMADEUS: kaonic clusters KLOE data analysis Studying the properties of the KN potential in the nuclear medium • A strong attractive potential will allow the formation of deeply bound kaonic clusters, with exotic features that would allow to investigate: • - spontaneous and explicit symmetry breaking of QCD • kaon condensation in nuclear matter (neutron stars) • super dense matter (x5 normal nuclear matter) • etc • K‐N interactions @ DAΦNE Oton Vázquez Doce

  10. DAΦNE AMADEUS: kaonic clusters KLOE data analysis Studying the properties of the KN potential in the nuclear medium • A strong attractive potential will allow the formation of deeply bound kaonic clusters, with exotic features that would allow to investigate: • - spontaneous and explicit symmetry breaking of QCD • kaon condensation in nuclear matter (neutron stars) • super dense matter (x5 normal nuclear matter) • etc • Intense theoretical debate with several different approaches: • - Few-body calculations solving Faddeev equations • - Variational calculations with phenomenological KN potential • - KN effective interactions based on Chiral SU(3) dynamics • K‐N interactions @ DAΦNE Oton Vázquez Doce

  11. DAΦNE AMADEUS: kaonic clusters KLOE data analysis Studying the properties of the KN potential in the nuclear medium • A strong attractive potential will allow the formation of deeply bound kaonic clusters, with exotic features that would allow to investigate: • - spontaneous and explicit symmetry breaking of QCD • kaon condensation in nuclear matter (neutron stars) • super dense matter (x5 normal nuclear matter) • etc • Intense theoretical debate with several different approaches: • - Few-body calculations solving Faddeev equations • - Variational calculations with phenomenological KN potential • - KN effective interactions based on Chiral SU(3) dynamics For K-pp system, predicted values both for B and Γ expand over the range from 0 to 200 MeV • K‐N interactions @ DAΦNE Oton Vázquez Doce

  12. DAΦNE AMADEUS: kaonic clusters KLOE data analysis Experimental data kaonic 3-baryon state: ppnK- kaonic dibaryon state: ppK- KK Λp Experimental resultsfromFINUDA K- stopped in light nuclei Invariantmassspectroscopy Λd • K‐N interactions @ DAΦNE Oton Vázquez Doce

  13. DAΦNE AMADEUS: kaonic clusters KLOE data analysis Experimental data kaonic 3-baryon state: ppnK- kaonic dibaryon state: ppK- KK Λp Experimental resultsfromFINUDA Λp ResultsfromKEK: K- stopped in light nuclei Invariantmassspectroscopy Λd Λd K- stopped in 4He Invariantmassspectroscopy Λd • K‐N interactions @ DAΦNE Oton Vázquez Doce

  14. DAΦNE AMADEUS: kaonic clusters KLOE analysis Experimental data kaonic 3-baryon state: ppnK- kaonic dibaryon state: ppK- KK Λp Experimental resultsfromFINUDA Λp ResultsfromKEK: K- stopped in light nuclei Invariantmassspectroscopy Λd Λd K- stopped in 4He Invariantmassspectroscopy Λd p¯ 4He annihilation DISTO OBELIX Λp Λp p+p → K++X (Λd) p4He annihilation • K‐N interactions @ DAΦNE Oton Vázquez Doce

  15. DAΦNE AMADEUS: kaonic clusters KLOE analysis Experimental data kaonic 3-baryon state: ppnK- kaonic dibaryon state: ppK- KK Λp Experimental resultsfromFINUDA KK Λp ResultsfromKEK: K- stopped in light nuclei Invariantmassspectroscopy Λd Λp Λd K- stopped in 4He Invariantmassspectroscopy Experimental results from FOPI Λd p¯ 4He annihilation from HEAVY ION COLLISIONS Λd DISTO OBELIX Λp Λp p+p → K++X (Λd) p4He annihilation • K‐N interactions @ DAΦNE Oton Vázquez Doce

  16. DAΦNE AMADEUS: kaonic clusters KLOE data analysis Nucl.Phys.A835:51-58,2010. arXiv:1001.1300 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  17. DAΦNE AMADEUS: kaonic clusters KLOE data analysis • the future experiments in Japan at J-PARC will produce kaonic nuclear states only with K--induced reactions in- flight (E15; E17) • alternative approaches followed at GSI with FOPI using • proton-nucleus collisions at beam energies close to the • strangeness production threshold and with nucleus- • nucleus collisions • a dedicated facility – AMADEUS at DANE will study antikaon-mediated bound nuclear systems with K- induced reactions at rest Nucl.Phys.A835:51-58,2010. arXiv:1001.1300 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  18. DAΦNE AMADEUS: experimental program KLOE data analysis AMADEUS: The main program kaonic dibaryon states: ppK- and pnK- produced in a 3He gas target Study the most fundamental antikaon deeply bound systems in formation and decay processes: kaonic 3-baryon states: ppnK- and pnnK- produced in a 4He gas target • K‐N interactions @ DAΦNE Oton Vázquez Doce

  19. DAΦNE AMADEUS: experimental program KLOE data analysis AMADEUS: extended program Low-energy charged kaon cross section on p, d, He-3 and He-4, for K-momentum lower than 100 MeV/c (missing today) The K- nuclear interactions in Helium (poorly known – based on one paper from 1970…) Properties of Λ and charged Σ´s for example decays in channels with a neutrino → astrophysics implications (cooling of compact stars) Resonance states as Λ(1405) or the Σ(1385) could be understood with high statistics; their behaviour in nuclear medium can be studied too • K‐N interactions @ DAΦNE Oton Vázquez Doce

  20. DAΦNE AMADEUS: experimental program KLOE data analysis AMADEUS: three key features Full acceptancy Pureness Full reconstruction Invariant mass + Missing mass • K‐N interactions @ DAΦNE Oton Vázquez Doce

  21. DAΦNE AMADEUS setup KLOE data analysis • Full acceptance and high precision measurements will be made by implementing the KLOE detector with an inner AMADEUS setup From KLOE to AMADEUS Almost full acceptancy 4π: DRIFT CHAMBER (50 cm. gap in KLOE DC around the beam pipe) ELECTROMANETIC CALORIMETER • K‐N interactions @ DAΦNE Oton Vázquez Doce

  22. DAΦNE AMADEUS setup KLOE data analysis • Full acceptance and high precision measurements will be made by implementing the KLOE detector with an inner AMADEUS setup From KLOE to AMADEUS K-stopped + 4He → p + (K-pnn) (50 cm. gap in KLOE DC around the beam pipe) K-stopped + 4He → n + (K-ppn) Setup for AMADEUSwithin KLOE: • Modification of the beam pipe of KLOE-2 in order to allow access • Target( A gaseous He target for a firstphase of study) • Trigger (1 or 2 layers of ScFisurroundingtheinteractionpoint) • Innertracker(eventually, a first tracking stagebeforethe DC) • The implementation of the AMADEUS dedicated setup around the beam pipe will modify the topology of the events, stopping the K- in a target inner to the DC. • K‐N interactions @ DAΦNE Oton Vázquez Doce

  23. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup: beam pipe • Central region made of CARBON FIBER: • Vacuum chamber • External part of cryostate and target walls • Aluminium for the peripheral part KLOE2 AMADEUS • K‐N interactions @ DAΦNE Oton Vázquez Doce

  24. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup:target cell Low-mass cryogenic gas target cell: T = 10 K P = 1.0 bar Rin = 5 cm Rout = 15 cm L = 20 cm SIDDHARTA AMADEUS: working T 22 K working P 1.5 bar Alu-grid Side wall: Kapton50 µm Entrance window: Kapton 50 µm • K‐N interactions @ DAΦNE Oton Vázquez Doce

  25. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup:target cell AMADEUS Monte Carlo Low-mass cryogenic gas target cell: T = 10 K P = 1.0 bar Rin = 5 cm Rout = 15 cm L = 20 cm SIDDHARTA AMADEUS: SIDDHARTA Monte Carlo working T 22 K working P 1.5 bar Alu-grid Side wall: Kapton50 µm Entrance window: Kapton 50 µm • K‐N interactions @ DAΦNE Oton Vázquez Doce

  26. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup: Trigger system • K‐N interactions @ DAΦNE Oton Vázquez Doce

  27. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup: Trigger system Silicon photomultipliers + scintilliating fibers Ideal for ScFi couplin and high granularity detector Time resolution below 1 ns Insensitive to strong magnetic fields High gain (>106) and quantum efficiency • Instrumented fibers: Saint Gobain BCF- 10 single cladding: • Emission peak 432 nm • Decay time 2,7 ns • 1/e 2.2 m • 80000 ph./MeV MPPC Hamamatsu S10362-11-050U, efective area 1mm2,,400 pixel wlorking biases ̴ 70 V . • K‐N interactions @ DAΦNE Oton Vázquez Doce

  28. DAΦNE AMADEUS setup KLOE data analysis SiPM + Pre-amp + scintilliating fiber TIME RESOLUTION STUDY@ Roma3 University Laser directly on fiber: Resolution is slightly worse ≈ 80 ps due to internal reflexion Laser directly on SiPM; 1 Khz Res ≈ 40 ps Amplifier is not worsening! • K‐N interactions @ DAΦNE Oton Vázquez Doce

  29. DAΦNE AMADEUS setup KLOE data analysis tests installation at DAΦNE SIDDHARTA setup Siddharta Kaon Monitor 2Layers of Scintillators up&down The interaction point detecting K+ K- emmited in opposite directions DAΦNE beam pipe Our test setup • K‐N interactions @ DAΦNE Oton Vázquez Doce

  30. DAΦNE AMADEUS setup KLOE data analysis tests installation at DAΦNE SIDDHARTA setup Siddharta Kaon Monitor 2Layers of Scintillators up&down The interaction point detecting K+ K- emmited in opposite directions DAΦNE beam pipe Our test setup • K‐N interactions @ DAΦNE Oton Vázquez Doce

  31. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup:Trigger system New TEST SETUP Test beam at BTF in Frascati and past at PSI (Zurich) wiht hadrons 2-rings of double layer 16 fibres 64 fast pre-amplifiers (64x) 2 boards of 32 constant fraction discriminator with zero jitter • K‐N interactions @ DAΦNE Oton Vázquez Doce

  32. DAΦNE AMADEUS setup KLOE data analysis AMADEUS setup:Trigger system New TEST SETUP Test beam at BTF in Frascati and past at PSI (Zurich) wiht hadrons 2-rings of double layer 16 fibres 64 fast pre-amplifiers (64x) 2 boards of 32 constant fraction discriminator with zero jitter Pion an electron fluxes in piM1 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  33. DAΦNE AMADEUS KLOE data analysis Experimental timeline at DAΦNE DEAR kaonic hydrogen past KLOE CP violation FINUDA hypernuclei present SIDDHARTA kanonic atoms KLOE2 proposal for the future (KLOE2+) SIDDHARTA2* AMADEUS* kaonic nuclei • K‐N interactions @ DAΦNE Oton Vázquez Doce

  34. DAΦNE AMADEUS KLOE data analysis for CPT symmetry and QM tests, hadronic physics, and more Almost full acceptancy 4π: DRIFT CHAMBER - 90% He - momentum resolution ~ 0.4% The KLOE detector ELECTROMANETIC CALORIMETER - σE/E= 5.7%/√E (GeV) KLOE@ DAΦNE by S. Miscetti @ Quark Confinement IX. Madrid, 2010 Status of KLOE2. arXiv:1001.3591, G. Venanzoni for the KLOE2 collaboration • K‐N interactions @ DAΦNE Oton Vázquez Doce

  35. DAΦNE SIDDHARTA AMADEUS KLOE data analysis • - Test the behaviour of the KLOE detectorfor hadronic physics purposes • Possibility to study the phenomenon with an active target KLOE data analysys: how K+/K- events looks like nowadays in KLOE: • The implementation of the AMADEUS dedicated setup will modify the topology of the events, stopping the K- in a target inner to the DC. • The Drift Chamber of KLOE contains mailny 4He (90%, 10% isobutane) • From analysis of KLOE data and Monte Carlo: 0.1 % of K- should • stop in the DC volume • This would lead to hundreds • of events with K- hadronic interactions at rest • “AMADEUS Step-0” EMC 4He K- e+  e- Drift Chamber K+ • K‐N interactions @ DAΦNE Oton Vázquez Doce

  36. DAΦNE AMADEUS KLOE data analysis K-stopped +4He→ n + n + (K-pp) Λ+ p K-stopped +4He→ n + (K-ppn) Λ+ d • Statistics: analyzing data up to an integrated luminosity • of ~1,7 fb-1 (80% KLOE RUNS 2004/2005) • Data analysis: search for hadronic interactions with Λ(1115): • Λ → p + π-(64% BR) • Construct a vertexwithΛ + an extra particle • K‐N interactions @ DAΦNE Oton Vázquez Doce

  37. DAΦNE AMADEUS KLOE data analysis K-stopped +4He→ n + n + (K-pp) Λ+ p K-stopped +4He→ n + (K-ppn) Λ+ d • Statistics: analyzing data up to an integrated luminosity • of ~1,7 fb-1 (80% KLOE RUNS 2004/2005) • Data analysis: search for hadronic interactions with Λ(1115): • Λ → p + π-(64% BR) • Construct a vertexwithΛ + an extra particle • Protons and deuterons are firstlyselectedfromthespectrum of particlesneartothe Lambda vertexbydE/dx PID deuterons EMC E (MeV/c) DC dE/dx (adc counts) protons protons deuterons charge * p(MeV/c) charge * p(MeV/c) • K‐N interactions @ DAΦNE Oton Vázquez Doce

  38. DAΦNE AMADEUS KLOE data analysis Selection of events Λ+ p y (cm) Kaon is rarely tracked due to its low momentum or short track Λ+ d Cluster in the ECAL (time info) 2 different vertices reconstrucion: Λ -> p + pion (K- + 4He) -> Λ + d Ecal DC volume other kaon x (cm) pion proton • - Calculate p/d mass by TOF • Evaluate Σ0 background • Use Λ lifetime as quality cut Proton from Λ Are required to have at least 1 cluster Deuteron /proton to reproduce the time of the event • K‐N interactions @ DAΦNE Oton Vázquez Doce

  39. DAΦNE AMADEUS KLOE data analysis Selection of events LAMBDA LIFETIME • Proton/deuteroncandidates are requiredtohaveanassociatedcluster in the EMC and itsmassismeasuredbytime of flight. 1/3.7 -> τ=0.25 ns (PDG=0.26) Time (ns) Mdeuteron(MeV/c2) Proton from Λ Are required to have at least 1 cluster Deuteron /proton to reproduce the time of the event • - Calculate p/d mass by TOF • Evaluate Σ0 background • Use Λ lifetime as quality cut • K‐N interactions @ DAΦNE Oton Vázquez Doce

  40. DAΦNE AMADEUS KLOE data analysis Selection of events Improved Λd vertex reconstruction Improved selection of events in DC-gas Λd vertex Λ -> p+π Λ vertex Λ+d LAMBDA LIFETIME Vertex radial position (cm) • Proton/deuteroncandidates are requiredtohaveanassociatedcluster in the EMC and itsmassismeasuredbytime of flight. 1/3.7 -> τ=0.25 ns (PDG=0.26) Time (ns) Mdeuteron(MeV/c2) Proton from Λ Are required to have at least 1 cluster Deuteron /proton to reproduce the time of the event • - Calculate p/d mass by TOF • Evaluate Σ0 background • Use Λ lifetime as quality cut • K‐N interactions @ DAΦNE Oton Vázquez Doce

  41. DAΦNE AMADEUS KLOE data analysis Invariant masses Preliminary Λ→ p + π- KLOE: statistical error 0. 003 MeV/c2 PDG: MΛ= 1115,683 ± 0.006 stat ± 0.006 syst (MeV/c2) σ = 0. 289 ± 0.003 MeV/c2 Minvpπ(MeV/c2) • K‐N interactions @ DAΦNE Oton Vázquez Doce

  42. DAΦNE AMADEUS KLOE data analysis Invariant masses Preliminary Λ→ p + π- KLOE: statistical error 0.003 MeV/c2 PDG: MΛ= 1115,683 ± 0.006 stat ± 0.006 syst (MeV/c2) σ = 0. 289 ± 0.003 MeV/c2 Efficency for tracks with P < 400 MeV improved increased acceptancy Minvpπ(MeV/c2) Total events in DC Volume 79 Λdanalysis Pd(MeV/c) MinvΛd(MeV/c2) Md+ Mp+ Mπ- Md + Mp+ MK PΛ(MeV/c) • K‐N interactions @ DAΦNE Oton Vázquez Doce

  43. DAΦNE AMADEUS KLOE data analysis Neutral particles detection Λdanalysis K-stopped +4He→ n+ (K-ppn) Λ+ d • K‐N interactions @ DAΦNE Oton Vázquez Doce

  44. DAΦNE AMADEUS KLOE data analysis Neutral particles detection Λdanalysis K-stopped +4He→ n+ (K-ppn) Λ+ d Λ-> n π0 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  45. DAΦNE AMADEUS KLOE data analysis Neutral particles detection Σ0 contamination in Λp events Ecal π Use of the time information from the EMC -With the extrapolation of the charged and neutral (lambda) tracks the time of the Interaction (Tk) is obtained Time correlation between neutral clusters (not associated to any charged track) and Tk assuming a photon travelling: p proton Λ Σ0 Tk Tphoton -Tk (MeV/c) Minvγγ(MeV/c2) • K‐N interactions @ DAΦNE Oton Vázquez Doce

  46. DAΦNE AMADEUS KLOE data analysis • (Σπ)0 spectrum • 3-quark baryon? • KN quasibound state? • two pole KN-Σπ channel coupling? • ...on the nature of the Λ(1405) π D. Jido, E. Oset and T. Sekihara,``Kaonic production of Lambda(1405) off deuteron target in chiral dynamics''  arXiv:0904.3410 [nucl-th]. Ecal p γ Λ Σ0 • possible task for AMADEUS? Ecal γ γ π0 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  47. DAΦNE AMADEUS KLOE data analysis • (Σπ)0 spectrum • 3-quark baryon? • KN quasibound state? • two pole KN-Σπ channel coupling? • ...on the nature of the Λ(1405) π • pseudo-kinematic fit: • χ2computing: • -momentum of proton and pion • -Covariancematrixelementsforeverytrack • -time and positions plus resolutionsforphotons • Allowstorejectbackgroundselectingtherightcombination of photons • Constraints: Δt forthearrival time of photons • No massassumption -> unbiasedmassspectras Ecal p γ Λ Σ0 Ecal γ γ π0 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  48. DAΦNE AMADEUS KLOE data analysis • (Σπ)0 spectrum • 3-quark baryon? • KN quasibound state? • two pole KN-Σπ channel coupling? • ...on the nature of the Λ(1405) π • Kinematicfit: • χ2computing: • -momentum of proton and pion • -Covariancematrixelementsforeverytrack • -time and positions plus resolutionsforphotons • Allowstorejectbackgroundselectingtherightcombination of photons • Constraints: Δt forthearrival time of photons • No massassumption -> unbiasedmassspectras Minvγγ(MeV/c2) Ecal p γ Minvγγ(MeV/c2) MinvΛγ(MeV/c2) Λ Σ0 MinvΛγ(MeV/c2) Ecal γ γ π0 • K‐N interactions @ DAΦNE Oton Vázquez Doce

  49. DAΦNE AMADEUS KLOE data analysis • (Σπ)0 spectrum Preliminary Events in the DC volume DC wall MinvΣ0π0(MeV/c2) • K‐N interactions @ DAΦNE Oton Vázquez Doce

  50. DAΦNE AMADEUS KLOE data analysis K- He interactions in KLOE PROVED • Capabilities of the KLOE detector for studying K- hadronic interactions • Possibility to study the phenomenon with an active target TO DO LIST • Apply acceptance correction for invariant masses distributions • Evaluate background distributions (hadronic interaction, multi-nucleon absorption, etc) for the analises shown previously (Monte Carlo) • Exploit the neutral particles detection capabilities of KLOE (Kppn -> Λ d n, neutral decay of Λ , etc) • Determine rates for the different reactions in 4He and in 12C • Exotic (and not so) physics data:) hypernuclei, Σ(1385), etc. • New KLOE data! • K‐N interactions @ DAΦNE Oton Vázquez Doce

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