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Muon Bundles from Cosmic Ray Showers Detected by DELPHI at LEP

Jan Ridky and Petr Travnicek Inst. of Physics, Czech Academy of Sciences, Prague for DELPHI collaboration. Muon Bundles from Cosmic Ray Showers Detected by DELPHI at LEP. Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004. Detection of cosmic rays at LEP. ALEPH (140 m, E cut = 70 GeV).

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Muon Bundles from Cosmic Ray Showers Detected by DELPHI at LEP

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  1. Jan Ridky and Petr Travnicek Inst. of Physics, Czech Academy of Sciences, Prague for DELPHI collaboration Muon Bundles from Cosmic Ray Showers Detected by DELPHI at LEP Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  2. Detection of cosmic rays at LEP ALEPH (140 m, Ecut = 70 GeV) DELPHI (100 m, Ecut = 50 GeV) L3 (30 m, Ecut = 15 GeV) Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  3. Simulation and detection Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  4. Description of the overburden different kinds of molasses 5 layers with proper rock density & experimental cavern description Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  5. Detektor DELPHI MUB HCAL TOF TPC Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  6. Typical high multiplicity event RUN 107634, EVT 4731 Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  7. Saturated event … we have 6 such cases Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  8. Data selection - DELPHI cosmic trigger coincidence of 3 sectors in TOF, parasitic data taking to e+e- and several dedicated cosmic runs Nmuons > 4 Duty cycle of LEP  total live time » 1.6 106 s Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  9. Projected angle  background rejection HCAL projected angle Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  10. Muon multiplicity 1999, 2000 4 saturated events 2 saturated events (MUB) Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  11. Saturated events • too many hits, reconstruction in HCAL fails • 6 such events, parallel ‘tracks’ of un-hit tubes -> cosmic • 2 events in MUB  multiplicity >150 Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  12. MC comparisons Which model provides more muons? LDF of p > 50 GeV muons => QGSJET > SIBYLL > DPMJET Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  13. HCAL – MC (QGSJET) vs. DATA Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  14. Systematic errors – rock density, cross-talk cross-talk rock density Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  15. Simulations – supposed flux Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  16. HCAL – MC (QGSJET) vs. DATA flux no. 1 Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  17. Comparison – MC vs. DATA flux 1, 2, 3- influence of the flux of primary particles Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  18. Simulations – energy contributions – flux 1 Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  19. Simulations – energy contributions – flux 1 Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  20. TPC sky plot (galactic coordinates), HCAL multiplicity > 15 Jan Ridky, ISVHECRI, Pylos, Greece, 6-12 Sept. 2004

  21. Other LEP results Delphi Aleph L3-C multiplicity

  22. Conclusions • DELPHI cosmic data in qualitative agreement with other LEP measurements (L3+C). • High energy models fail to describe muon multiplicity • Data are sensitive to the dynamics of the high energy interactions (talk of Jörg Hörandel) • Cosmic data …. the only measurement at LEP unexplained by theory

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