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Future Experiments with HADES at FAIR

Future Experiments with HADES at FAIR. Pavel Tlustý , NPI Řež. “near future” - experiments on SIS18 in 2010-2015? - upgrade of the HADES spectrometer experiments with HADES on SIS100 at FAIR in 2016-. June 24, 2010. CHIRAL 2010 workshop, Valencia, June 21-24, 2010.

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Future Experiments with HADES at FAIR

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  1. Future Experiments with HADES at FAIR Pavel Tlustý, NPI Řež • “near future” • - experiments on SIS18 in 2010-2015? • - upgrade of the HADES spectrometer • experiments with HADES on SIS100 at FAIRin 2016- June 24, 2010 CHIRAL 2010 workshop, Valencia, June 21-24, 2010

  2. 1. C+C 2. p+p 1.0 AGeV(2004) 1.25 GeV(2006) 2.0 AGeV(2002) d+p 1.25 GeV(2007) 4. p+p 3. Ar+KCl 3.5 GeV(2007) 1.76 GeV(2005) p+Nb Evolution of e+e- yield Strangeness: , K±,0,  3.5 GeV(2008) Completed physics program „Anomalous” excess of e+e- pairs at intermediate masses  verify DLS data vector mesons  /  in-medium NN bremsstrahlung and  Dalitz decays Resonance (,N*) production, formfactors and studies of /  Dalitz decays (helicity angles) 2.2 GeV(2004) p+p

  3. Yield/Apart Ar+KCl Ca+Ca “Excess” vs. beam energy and system size • Observed systematics of “excess" • Scales with Ebeam like  production • Scales with Apart stronger than linear: • ≈ <Apart>1.4

  4. Vector mesons • larger system – better precision needed for differential studies • reference spectrum (NN)- peripheral reactions, d+p, ? • can one see in-medium effects on vector meson?

  5. K0 - N potential Ar+KCl data compared to IQMD +A & p+A data (FOPI & ANKE) consistent with U = 205 MeV at =0 extrapolation from low density to 0 (HSD) Data compared to the IQMD. Version with potential preferred. • Consistent with KN-potential with a • strength of U=39 MeV @ r=r0 • extrapolation from high density to 0 (IQMD)

  6. Kaon flow sideward out-of plane(eliptic) W. Cassing et al., NPA 727 (2003) 59, E. Bratkovskaya, priv. com. Coupledchannel G-Matrix approach (K-spectralfunctions): L. Tolos et al., NPA 690 (2001) 547 K+ Y. Shin et. al. (KAOS) PRL 81 (1998) 1576

  7. M. Płoskon, PhD Thesis, Univ. Frankfurt 2005 Kaon flow sideward out-of plane(eliptic) W. Cassing et al., NPA 727 (2003) 59, E. Bratkovskaya, priv. com. Coupledchannel G-Matrix approach (K-spectralfunctions): L. Tolos et al., NPA 690 (2001) 547

  8. Physics Program on SIS18 – Heavy Ions combined measurement of dielectron and strangeness productionin heavy systems • Dielectrons: • Studies of properties of the low-mass, i.e. 0.14 < Me+e− < 0.5 GeV/c2dielectron excess • Vector meson (ρ/ω/φ) spectroscopy in the dielectron channel • Strangeness: • φ meson production via the K+K− decay channel • K0, K+ and K− production characteristics by means of transversemomentum,rapidity and flow measurements • Studies of strange baryon production: Λ(1115),Σ(1385) and Ξ−(1321) • Search for kaonic clusters • Studies of HBT correlations

  9. Hades Upgrade ProjectAim: heavy systems at SIS18 and SIS100 List of HADES upgrade subprojects:  RPC - Resistive Plate Chamber FINISHED  Time res. 50-80ps, high granularity  Forward Wall FINISHED  range 0.2 – 7 degrees, reaction plane  DAQ-Upgrade (RICH, MDC, FWALL, TOF, SHOWER)  goal 20kHz for Au+Au LVL1 ON GOING  MDC I rebuild  system stability FINISHED • RPC performance (beam test) •  Efficiency above 95 % •  Time res. 50-80ps •  Negligible crosstalk < 1% Multipurpose Trigger Readout Board TRB: 4 TDC – 128 channels (HPTDC), 4x512Mb SDRAM, FPGA – Virtex4LX40, ETRAX, FS – 4 processors, 100Mb/s,TCP/IP, 2,5 Gb/s optical link, DSP TigerSharc, DC/DC converters, End of 2010: HADES ready for heavier systems

  10. Simulations – tracking study  Tracking ready to be used in high multiplicity environment  Secondary vertex reconstruction not ready  Tracking optimization on-going to be verified with HI beam

  11. (pp+pn)/2 baryonic radiation  o Dalitz  Medium effects for intermediate masses Collision systems for HI runs: Highest possible energy  high VM and strangeness production Largest possible colliding systems  increase compression and medium effects Au(71+) - 1.25 AGeV - similar to pp, np data Ag(46+) – 1.65 AGeV - comparable with Ar+KCl (1.75 AGeV) A Large excess (~8)expected from Ar+KCl excess scaling above the NN reference Differential studies of excess possible: centrality, dN/dmt , angular distributions… Triggers for peripheral and central reactions. Use peripheral reactions for a comparison with the NN reference.

  12. VM in HI coll. : regeneration and absorption - Ne+e- ~ e+e- Tfireball trigger (25% ot total cross section) with 10 KHz HSD + Dropping mass & mass broadenning Sensitivity to medium effects for VM AGeV AGeV AGeV • Ag+Ag : maximal density  VM production rate • direct comparison to Ar+KCl possible

  13. Strangeness : count rate estimates • counts/day for semicentral LVL1 assuming efficiencies & production rates from ArKcl • 20-100 more than in ArKcl ~ ! ! ! - acc(RPC) x trigger rate (no LVL2 )

  14. Simulations: strangeness K-identification acceptance purity (no dE/dx used) • large acceptance: mid rap. coverage • very good K- purity up to pt < 800 MeV/c

  15. Beam/target and Trigger setting, Shift request • Two beam/target combinations 197Au +197Au at 1.25 A GeV • 107Ag + 107Ag at 1.65 A GeV • Beam intenisty ~2*107/spill(5s) • 1% interaction target (12 segments) • LVL1 trigger settings (~20 kHz total): • minimum-bias • semicentral (25% total cross section) • Shift request: Au + Au 35 + 5 days (120 shifts) Ag + Ag 45+ 5 days (150 shifts)

  16. FAIR facility at GSI • SIS100 beam energies: • ions up to 14 A GeV (Au79+ – 11.2 AGeV) • protons up to 29 GeV +1 year +1 year B. Sharkov

  17. HADES/CBM cave design W. Niebur

  18. Di-electrons at SIS100 (2-10 AGeV), motivation 30AGeV 11AGeV 2AGeV S. Vogel et al.Phys. Rev. C78 044909 (2008) • No di-electron data exist in this energy range • Extension of the HADES physics program • Enhance production of Vector Mesons: • SIS18  SIS 100 • subthreshold production  above threshold • better signal, precise line shape determination • reference data for SIIS300 HADES at SIS100: - running experiment, well understood performance - currently conducted upgrade will improve stability, DAQ and time resolution of the Spectrometer - easy transfer to FAIR, experienced crew - can deliver high quality data

  19. Di-electrons at SIS 100 e+e−acceptance • Acceptance for di-electrons from ω->e+e− • (2 AGeV and 8 AGeV) • Direct ω decay: PLUTO, ω from thermal model • Single leptons filtered with HADES acceptance • 90 opening angle cut was applied • Acceptance: • 2 AGeV 33 % • 8 AGeV 21 % • Number of 's in acceptance increase by a factor of ~50

  20. Di-electrons at SIS 100 – invariant mass 1.0 AGeV • Di-electron invariant mass for various systems: • ( C+C 2 AGeV and 8 AGeV, Au+Au 1 AGeV and 8 AGeV ) • All dilepton sources generated by PLUTO, hadronic and electromagnetic decays • Single leptons filtered with HADES acceptance • Lepton momentums smeared • 90 opening angle cut was applied Realistic simulation in preparation

  21. Hadrons at SIS 100 – acceptance URQMD and PLUTO events filtered with HADES acceptance  midrapidity covered at both 2.0 and 8.0 AGeV  15 % reduction at 8 AGeV for π  40 % reduction at 8 AGeV for K 2 A GeV 8 A GeV

  22. Occupancy estimation at 8 AGeV Simulated events  Central Au+Au at 1.5 AGeV and 8 AGeV, C+C at 2.0 AGeV and 8 AGeV  HGeant used for a realistic detector modeling Main outcome  From C+C at 2.0 AGeV  Au+Au at 1.5 AGeV (SIS18) - factor of 14  At Au+Au at 1.5 AGeV expected 20% double hit probability !!!  corresponds to Ni+Ni at 8 AGeV - heaviest system at SIS 100

  23. Side View START Electromagnetic calorimeter for HADES (2011- ...) substitute for Pre-Shower (18º<Θ<45º, 8 m2;18 tons)  el/ separation,pº and ηDalitz, ... • For pair excess determination a precise knowledge of the hadronic cocktail is needed • (particle yields at chemical freeze-out) • At 2-40 AGeV mainly dominated by η-Dalitz • Normalization to π0 (at SIS18 – TAPS data) •  Calorimeter for HADES •  π0, η measurement •  improved pion suppression Calorimeter project

  24. 5.4% / sqrt(E) Calorimeter project Millstones achieved: Test at MAMI, lead glass modules from OPAL  energy resolution for photons K. Lapidus, ElianeEpple, simulation  the parameterization lookup table almost ready, detailed, fast simulation will be possible Mechanical construction–  general concept ready, approved by HADES construction engineer, U. Kopf

  25. Calorimeter project Millstones achieved:  Measure the pion rejection and compare this to the simulation HADES ECM test in CERN T10 (F.Guber), HADES – NA61 collaboration May 24 - 31. Millstones to be achieved: FE electronics pi0 reconstruction in beam test

  26. Summary and outlook • Di-electron radiation from the HI collision at SIS 18 is being investigated in a very systematic, model independent way. • No medium effects observed for light systems (C+C) • The "reference spectrum" based on elementary reactions established for heavier systems (Ar+KCl) • First VM signal measured at SIS 18 in Ar+KCl collisions • Modification of the  meson properties in-medium (p+Nb) under investigation • Interesting physics program for future proposals of HADES at SIS 18 • ( Au+Au, Ag+Ag, − beam ) • SIS100 – a natural way of the physics programme extension • The device is ready to take high quality data • Easy installation at SIS 100 • VM produced above the production thresholds • High acceptance for direct decays of VM over whole energy regions of SIS 18 and SIS100 (from 33 % at SIS 18 to 22 % at SIS100) • Waiting for FAIR . . . 2016-2017 ....

  27. The HADES Collaboration Cyprus: Department ofPhysics, University ofCyprus Czech Republic: NuclearPhysics Institute, AcademyofSciencesof Czech Republic France: IPN (UMR 8608), Université Paris Sud Germany: GSI, Darmstadt FZ Dresden-Rossendorf IKF, Goethe-Universität Frankfurt II.PI, Justus Liebig Universität Giessen PD E12, Technische Universität München Russia: INR, Russian Academy of Science Joint Institute of Nuclear Research ITEP Spain: Departamento de Física de Partículas, University of Santiago de Compostela Instituto de Física Corpuscular, Universidad de Valencia-CSIC Italy: Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud Istituto Nazionale di Fisica Nucleare, Sezione di Milano Poland: Smoluchowski Institute of Physics, Jagiellonian University of Cracow Portugal: LIP-Laboratório de Instrumentação e Física Experimental de Partículas 17 institutions120members

  28. Backup slides

  29. Kaonic Nuclear clusters Stat. model predictions for cluster formation in Au-Au collisions promising candidate ?: K- pp system • predictions from theory : 20-70 MeV binding energy , hadronic decay into p • experimental evidences : • FINUDA K- absorption on nucleus M (p) = 2255±7MeV/c2,= 67 ± 14 MeV/c2 M. Agnello et al., PRL 94, 212303 (2005). • DISTO p + p -> K+ +X X-> p MX = 2265 ±2 (stat) ± 5 (syst) MeV/c2 X = 118 ± 8 (stat) ± 10 (syst) MeV/c2 RMS radius of (p) < 1.7 fm ! Y. Yamazaki et al..arXiv:1002.3526 • R. Kotte : (p) source in ArKcl but  no sensitivity to p potential and ..no signal in p inv. mass visible

  30. Experiments with pion beams The GSI secondary pion beam line Mom. det. of the beam particles with precision 0.3% for exclusive reconstruction  Tracking in the beam line needed: silicon strip detector

  31. Pion beam project - beam detectors Beam tracking Si detectors (TU Munich)  Two 10cm x 10 cm sensors (P-Type) arrived, Radiation hard 1 Megarad level – to be verified !!!  Electronics designed by W.Koenig, partially produced, 2 versions will be tested at Munich: - discreet version, TRB based system Robert Münzer - nXyter version: RafalLalik

  32. Di-electrons from π− induced reactions at SIS18 M.Effenberger et al. nucl-th/9901039 • Exclusive measurement • large cross-section • off-shell ρ/ω coupling to • S11(1535) and D13(1550) • M.Soyeur et al., nucl-th/0003013 • - p (ω/ρ)n e+ e- n • − selection of ρ and ω • − η-> e+ e-, π0π0, ... • suppression by missing mass technique. • Beam particle tracking is essential, • in preparation cut on missing mass of e+ e- (nutron ); e+e- suppressed! • π−+ A – inclusive ω measurement • -p boundn e+e-n; • pe+e-< 300 MeV/c;  „at rest”

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