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Micro Black Holes

Micro Black Holes. Status Report. in the atlas detector. Nick Brett, C. Issever University of Oxford. 24-05-05. r BH = r s = 2GM BH. c 2. Black Hole Formation. Occurs if: b < 2 x r BH Where:. and: M BH = √S. In Extra-Dimensional models:. M pl 2 ~ M * 2+n R n.

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Micro Black Holes

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  1. Micro Black Holes Status Report in the atlas detector Nick Brett, C. Issever University of Oxford 24-05-05

  2. rBH = rs = 2GMBH c2 Black Hole Formation Occurs if: b < 2 x rBH Where: and: MBH = √S In Extra-Dimensional models: Mpl2 ~ M*2+n Rn G ~ 1 / Mpl2 Nick Brett - University of Oxford

  3. TH ~ 1 + n 4πrBH Hawking Radiation Black Holes emit radiation following a black body thermal spectrum n = # extra dim • Astronomic BH -- COLD -- No Evaporation • Micro BH -- HOT -- Evaporation Nick Brett - University of Oxford

  4. Simulation Micro Black hole events were simulated using the Cambridge based MC program Charybdis. CHARYBDIS: A Black Hole Event Generator (C.M. Harris, P.Richardson and B.R. Webber) CERN-TH / 2003-170 Has been slightly modified to function within Athena The following data sets have been produced Nick Brett - University of Oxford

  5. Number of Extra dimensions 2 4 6 Event Multiplicity electrons photons Number of Photons per event Number of Electrons per event muons jets Number of Muons per event Number of Jets per event 5 TeV n = 2,4 and 6 sample 104 events each (atlfast) Nick Brett - University of Oxford

  6. Number of Extra dimensions 2 4 6 Missing Et Missing Pt in GeV 5 TeV n = 2,4 and 6 sample 104 events each (atlfast) Nick Brett - University of Oxford

  7. Mass Reconstruction • Minimum of 4 jets • Leading Jets must have PT of 500, 400, 300 GeV respectively • Missing PT < 100 GeV The following cuts were applied: Nick Brett - University of Oxford

  8. Reconstructed BH Mass 5 TeV sample with n = 2 104 events (atlfast) 8 TeV sample with n = 2 104 events (atlfast) Nick Brett - University of Oxford

  9. photons electrons muons jets Energy Spectrum 5 – 14 TeV sample with n = 2 106 events (atlfast) Nick Brett - University of Oxford

  10. Temperature Reconstruction • Minimum of 4 jets • Leading Jets must have PT of 500, 400, 300 GeV respectively • Missing PT < 100 GeV • Electron η < 2.0 • Electron ET > 30 GeV The following cuts were applied: Nick Brett - University of Oxford

  11. Reconstructed Temperature TH = 174 GeV Energy in GeV 5 – 14 TeV sample with n = 2 (atlfast) Nick Brett - University of Oxford

  12. Full Simulation6.0 – 6.5 TeV with n = 2 Photons: No cuts Electrons: Delta eta < 0.01 Delta phi < 0.02 E/P (barrel) 0.8 – 1.3 E/P (endcap) 0.7 – 2.5 Jets: No cuts Muons: Has a CombinedMuon TrackParticle Nick Brett - University of Oxford

  13. Event Multiplicity electrons photons muons jets 6.0 – 6.5 TeV n = 2 sample (full sim) Nick Brett - University of Oxford

  14. Missing Et Missing Et in GeV 6.0 – 6.5 TeV n=2 sample (full simulation) Nick Brett - University of Oxford

  15. Reconstructed BH Mass Missing Et < 100 GeV Reconstructed Mass too high Double counting 6.0 – 6.5 TeV n = 2 (full simulation) Nick Brett - University of Oxford

  16. Electron e/p 6.0 – 6.5 TeV n = 2 (full simulation) 6.0 – 6.5 TeV n = 2 (full simulation) e/p needs to be improved Nick Brett - University of Oxford

  17. Electron Energy Spectrum Energy in GeV 6.0 – 6.5 TeV n = 2 350 events (full simulation) Nick Brett - University of Oxford

  18. Summary • Charybdis Black Hole MC interfaced with Athena • Engaged in preliminary studies using Atlfast (Athena 9.0.1) • Compared results with those found by the generators authors • Produced a small data set under full simulation (Athena 10.0.0) • Currently evaluating the full simulation data set Nick Brett - University of Oxford

  19. Outlook • Improve understanding of Atlfast data • Build up a full analysis using AOD’s for the fully simulated data • Once validated, produce a larger full simulation data set • Move toward a dedicated reconstruction algorithm for micro black holes • Study backgrounds and systematics Nick Brett - University of Oxford

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