Off-axis single lines?

• by expialidocious

  In some images, single lines appear from nowhere, pointing well off-center. Some cross other lines, but some are just out by themselves. What are they?

  Posted November 26, 2014 6:37 PM

• by DZM admin

  Good question. I see these often, and they're usually white. Would be curious to know as well!

  Posted November 26, 2014 6:45 PM

• by andy.haas scientist

  Those are usually "fake" tracks, formed from random alignments of hits (the little dots you see throughout the tracking detector).
  Good question!

  Posted November 26, 2014 7:23 PM

• by DZM admin

  Doesn't "white" mean that the computer identified them as something? Or did I get my lines (heh) crossed?

  Posted November 26, 2014 7:59 PM

• by andy.haas scientist

  White means that the computer could not match the track to a vertex.. .

  Posted November 26, 2014 8:17 PM

• by DZM admin

  Ah, right, white means the computer couldn't find a vertex. That's a good thing not to get messed up! 😃

  Posted November 27, 2014 10:24 PM

• by KillerApp

  So... we just ignore the single white off axis tracks?

  Posted November 28, 2014 10:23 AM

• by alanbarr scientist

  Yep, so single wild lines can be ignored. But if three or more come together, do mark the #ocv.

  Posted November 28, 2014 12:31 PM

• by KillerApp

  Thanks for clearing that up

  Posted November 28, 2014 2:09 PM

• by ElisabethB moderator in response to alanbarr's comment.

  The same goes for single white lines ! 😄 (sorry, that was just too funny ! 😄 )

  Posted November 28, 2014 7:10 PM