Intersection

• by Searchaway

  What is the status of the 'x' type marking in the lower right quadrant?

  Posted December 28, 2015 3:55 PM

• by Whoandwhatitis moderator

  Typically these 'X' patterns aren't an off-center vertex. This could be the result of particles colliding with detector material, which happens pretty frequently.

  However, with backward tracks, you might see an 'X' pattern. This happens when the computers go overboard and they draw non-existent paths back toward the beam-line. From the FAQ:

  Q: Are all line crossings OCVs? - A: No. Remember that we are looking
  at a 2d representation of a 3d picture (+time). Sometimes the paths of
  some particles just seem to cross in one of the views. Use your own
  judgement and don't worry, if it's unclear in one view the data for
  the other view will make up for it!

  Posted December 31, 2015 9:59 PM