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Collaboration Meeting, Erlangen, September 24, 2009

Collaboration Meeting, Erlangen, September 24, 2009. Update on Nuclearites Gabriela Pavalas (the hard work), Vlad Popa (the “rest”…). Considering 2.2 µs time windows with a muon cluster trigger (at least 5 L1 hits).

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Collaboration Meeting, Erlangen, September 24, 2009

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  1. Collaboration Meeting, Erlangen, September 24, 2009 Update on Nuclearites Gabriela Pavalas (the hard work), Vlad Popa (the “rest”…)

  2. Considering 2.2 µs time windows with a muon cluster trigger (at least 5 L1 hits). • A nuclearite would manifest through an excess of L0 hits! A linear cut was proposed. (from one golden run, 5 strings data) Short reminder from Marseille: What would be the imprint of a nuclearite in the available data? (How to obtain a flux limit?)

  3. Nuclearite mass (GeV) 3N Triggers after cut Percentage of 3N triggers Nuclearite events after cut Percentage of events 3*1016 253 72.1% 196 72.8% 1*1017 24285 99.4% 1652 96.8% Selection cut Background (data, MC muons) after cut: 0 • Large part of the signal retained 3

  4. Update: Trying to compute a limit from all 5 string golden runs, too many snapshots satisfied the single slice cut… A second cut introduced: multiple snapshot cut (multiple snapshots in a time window of 1 ms). But this is NOT the way to go. It could produce only flux upper limits that could worsen increasing the statistics!

  5. Proposed acquisition scenario with discovery potential: Data in a snapshot satisfies the first cut (L0 excess) Record all raw data for about 20 ms (as for GRB’s, but much shorter) Issue a warning to the group, that will download the data and analyze the event off-line. With 12 lines, events expected each few days. Fast, robust and safe first-sight analysis tools needed. If the event survives, there will be “all the time” for detailed final analysis…

  6. Fast “first sight” analysis method based on the “weight centers” of the distributions of the collected charge. Is currently under development and tests using nuclearite MC simulations and the real GRB data. (Thanks, Mieke!) Just a very preliminary hint…

  7. Data versus nuclearite simulation GRB data Nuclearite simulation • GRB run 030324_61_0296683 • frame index 27649 • 104 ms GeV • V = 300 km/s • zenith angle 40 deg. • crossing time ~ 2ms

  8. Explaining coordinates Nuclearite simulation GRB data

  9. z coord. of the charge weight center versus time Nuclearite simulation GRB data

  10. z coord. of the charge weight center versus time (2) Nuclearite simulation GRB data

  11. Charge versus time Nuclearite simulation GRB data Near the middle of ANTARES Closest approach to a PMT (~ 1m)

  12. 2D x / y weight center coordinates Nuclearite simulation GRB data

  13. 2D x / z weight center coordinates Nuclearite simulation GRB data

  14. GRB: <y> / <z> 1 frame = 10 ms

  15. Nuclearite: <y> / <z> 1 frame = 200 µs

  16. Getting more quantitative:

  17. <z> - t correlation coefficients Nuclearite simulation GRB data

  18. <x> - <z> correlation coefficients Nuclearite simulation GRB data

  19. Conclusions and to do list • Anomalous high L0 content muon triggers could be the “early warning” for the passage of a nuclearite and determine full data recording for ~ 20 ms • Best criteria still to be decided • More MC needed • Mix the GRB data with the nuclearite MC (soon!!!) • Go to 10 and 12 lines • Start the real search for nuclearites!

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