A Circle

• by starhunter11

  What is the pink circle in the upper left quadrant of this image?

  Posted November 26, 2014 6:38 PM

• by ElisabethB moderator

  Hi starhunter11 and welcome to HiggsHunters

  The pink circle is an artifact, no need to mark it. See the field guide : toughies

  Happy hunting ! 😄

  Posted November 26, 2014 6:43 PM

• by starhunter11 in response to ElisabethB's comment.

  Thanks, and happy hunting to you also.

  Posted November 26, 2014 6:49 PM

• by andy.haas scientist

  Yeah, it is a remnant from a vertex found by the computer, but whose tracks have since all failed further quality criteria. So it is likely a "fake" or a known particle decay.

  Posted November 26, 2014 8:19 PM