Event Index is a search engine for LHCb events located at https://eindex.cern.ch/ . It's a searchable index of MicroDSTs from strippings 20, 20r1, 21, 21r1. Its inner workings are described in the article Current capabilities:
  • Event selection by arbitrary criteria constructed from stripping lines, summary hashes and technical data. Full list and query examples
  • Histograms for summary hashes. To plot a histogram: make a search, wait for it to finish, click on "View histogram" link in the top right corner of the search results page.
  • Retrieving the list of LFNs containing the search results.
  • ROOT files download via "Download" button in dashboard For search results containing less than 1000 events ROOT files can be retrieved from GRID. This can take a couple of hours. The code for GRID collector is available on GitLab
  • Event visualization via Event Display integration. For search results containing less than 1000 events ROOT files can be retrieved from GRID - and they are automatically converted for Event Display. Example
  • Arbitrary and thus manual analysis of the data in MicroDSTs. If you have ideas for those, please write us.
    • Streams correlation calculation, see page 7 in this PPTS presentation
    • Stripping lines overlap to use for streaming optimization - see the 79th LHCb week presentation. The data is available on EOS for strippings 21, 21r1 root://eoslhcb.cern.ch//eos/lhcb/user/n/nkazeev/event_index_data/joint_streams_21_21r1_lines_intersection and 23r1 root://eoslhcb.cern.ch//eos/lhcb/user/n/nkazeev/event_index_data/lines_intersections_23r1.dat . A script for parsing the files is on GitLab

If encounter any problems, have feedback or feature requests, please don't hesitate to write nikita.kazeev@cernNOSPAMPLEASE.ch

-- NikitaKazeev - 2015-10-09

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Topic revision: r6 - 2016-03-19 - NikitaKazeev
 
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