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Hadron identification via energy loss measurements of the HADES multi-wire drift chambers

Hadron identification via energy loss measurements of the HADES multi-wire drift chambers. Alexander Schmah , Jochen Markert, Christian Müntz, Manuel Lorenz and Joachim Stroth for the HADES collaboration. HADES Setup. はです. H igh A cceptance D i- E lectron S pectrometer HADES @ SIS/GSI.

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Hadron identification via energy loss measurements of the HADES multi-wire drift chambers

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  1. Hadron identification via energy loss measurements of the HADES multi-wire drift chambers Alexander Schmah, Jochen Markert, Christian Müntz, Manuel Lorenz and Joachim Stroth for the HADES collaboration Alexander Schmah - GSI INPC 2007/06/04

  2. HADES Setup はです High Acceptance Di-Electron Spectrometer HADES @ SIS/GSI Explosion view Side view Alexander Schmah - GSI INPC 2007/06/04

  3. PID via TOF/TOFino TOFino (18° < Q < 45°) TOF (44° < Q < 88°) Alexander Schmah - GSI INPC 2007/06/04

  4. But: Ar+KCl @ 1.756 AGeV, September 2005 data 65 % multi hit probability Solution: MDC dE/dx information TOFino Multiplicity • TOFino • only 4 pads/sector 1.5 m Solution: RPC detector, available in 2008 Alexander Schmah - GSI INPC 2007/06/04

  5. drift cell • 6 layers per module • Low mass concept • Total number of • clusters per cm 80 5-10 mm Ar-C4H10 He-C4H10 • dE/dx depends on the Geometry • of a track in a 3D drift • Parametrization in a, distance to • wire and MDC type Multi wire drift chambers (MDC) Alexander Schmah - GSI INPC 2007/06/04

  6. ToT-dE/dx Simulation MDC ASD8 readout chips +TDC can measure ToT* Schematic simulation of Time-over Threshold nonlinear behaviour * The HADES tracking system (NIM Phy. Res. A 535 (2004) 242-246) Alexander Schmah - GSI INPC 2007/06/04

  7. Correction strategy • Strategy for • correction • Select protons in • TOF region • Calculate dE/dx • via Bethe-Bloch • and measured • momentum • derive correction • functions Alexander Schmah - GSI INPC 2007/06/04

  8. ToT-dE/dx Correction functions distance to angle a wire Alexander Schmah - GSI INPC 2007/06/04

  9. Corrected MDC dE/dx MDC I MDC II MDC III MDC IV particle track Truncated mean is calculated from all measurements of a track Alexander Schmah - GSI INPC 2007/06/04

  10. p p- p+ K+ Proton Cut TOF mass spectrum MDC dE/dx - proton cut Alexander Schmah - GSI INPC 2007/06/04

  11. p p- p+ K+ Pion Cut TOF mass spectrum MDC dE/dx - pion cut Alexander Schmah - GSI INPC 2007/06/04

  12. p p- p+ K+ Kaon Cut TOF mass spectrum MDC dE/dx - kaon cut K- Alexander Schmah - GSI INPC 2007/06/04

  13. Preliminary results (40 % of total statistics) Alexander Schmah - GSI INPC 2007/06/04

  14. Hint for a f-signal @ 1.756 AGeV (NN threshold for f = 2.59 GeV) • MDC dE/dx • available for the full acceptance • directly used for hadron PID • at high multiplicities • used for background reduction • (K+, K-) • additionally used for e+,e- PID Ar+KCl Preliminary results (40 % of total statistics) Alexander Schmah - GSI INPC 2007/06/04

  15. HADES Collaboration G. Agakishiev8, C. Agodi1, A. Balanda3,e, G. Bellia1,a, D. Belver15, A. Belyaev6, A. Blanco2, M. Böhmer11, J. L. Boyard13, P. Braun-Munzinger4, P. Cabanelas15, E. Castro15, S. Chernenko6, T. Christ11, M. Destefanis8, J. Díaz16, F. Dohrmann5, A. Dybczak3, T. Eberl11, L. Fabbietti11, O. Fateev6, P. Finocchiaro1, P. Fonte2,b, J. Friese11, I. Fröhlich7, T. Galatyuk4, J. A. Garzón15, R. Gernhäuser11, C. Gilardi8, M. Golubeva10, D. González-Díaz4, E. Grosse5,c, F. Guber10, M. Heilmann7, T. Hennino13, R. Holzmann4, A. Ierusalimov6, I. Iori9,d, A. Ivashkin10, M. Jurkovic11, B. Kämpfer5, K. Kanaki5, T. Karavicheva10, D. Kirschner8, I. Koenig4, W. Koenig4, B. W. Kolb4, R. Kotte5, A. Kozuch3,e, F. Krizek14, R. Krücken11, W. Kühn8, A. Kugler14, A. Kurepin10, J. Lamas-Valverde15, S. Lang4, J. S. Lange8, L. Lopes2, L. Maier11, A. Mangiarotti2, J. Marín15, J. Markert7, V. Metag8, B. Michalska3, D. Mishra8, E. Morinière13, J. Mousa12, C. Müntz7, L. Naumann5, R. Novotny8, J. Otwinowski3, Y. C. Pachmayer7, M. Palka4, Y. Parpottas12, V. Pechenov8, O. Pechenova8, T. Pérez Cavalcanti8, J. Pietraszko4, W. Przygoda3,e, B. Ramstein13, A. Reshetin10, M. Roy-Stephan13, A. Rustamov4, A. Sadovsky10, B. Sailer11, P. Salabura3, A. Schmah4, R. Simon4, S. Spataro8, B. Spruck8, H. Ströbele7, J. Stroth7,4, C. Sturm7, M. Sudol4, A. Tarantola7, K. Teilab7, P. Tlusty14, M. Traxler4, R. Trebacz3, H. Tsertos12, I. Veretenkin10, V. Wagner14, H. Wen8, M. Wisniowski3, T. Wojcik3, J. Wüstenfeld5, S. Yurevich4, Y. Zanevsky6, P. Zumbruch4 Alexander Schmah - GSI INPC 2007/06/04

  16. Topology drift cell • Topology of dE/dx as • a function of MDC type, • a and distance-to-wire • 4 MDC types • 5 degree angle bins • 0.1 mm to 0.25 mm • distance-to-wire bins Alexander Schmah - GSI INPC 2007/06/04

  17. Multi wire drift chambers (MDC) • Low mass concept • 6 layers per module drift cell Alexander Schmah - GSI INPC 2007/06/04

  18. ToT-dE/dx Data I • Stragety • Select protons in • TOF region • Calculate dE/dx • via Bethe-Bloch • and measured • momentum Alexander Schmah - GSI INPC 2007/06/04

  19. p p- p+ MDC dE/dx resolution Landau fit for each slice p- p+ p Alexander Schmah - GSI INPC 2007/06/04

  20. Multi wire drift chambers (MDC) Alexander Schmah - GSI INPC 2007/06/04

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