Where we were

1
Where we were

• With this new idea for field configuration, much
  more difficult to find momentum space
  asymmetries.

2
Different Idea

• ? may be possible to observe helicity
  correlations in quarks through resultant helicity
  correlations in hyperons (lambdas). The
  observable effect would be non-statistical
  fluctuations in the number of helicity lambdas
  on an event-by-event basis.

3
How Large an Effect?

• Rough (and optimistic) estimate assumes
• Width of Q (topological charge) distribution
  10.
• Each unit of Q in a given event leads to one flip
  of one quark helicity.
• One third of produced quarks will be strange,
  1/10 of strange quarks go to (primordial) ?
  production. ? spin determined by s quark spin.
• Effect occurs in bubble with distribution ?y1
• Used upgrade geometry for TPC (not tremendously
  better than current geometry for this
• ? Efficiency events for 3?
• 100 30M
• 72 110M
• 36 500M

4
Newer Idea use away-side pairs

• i.e. start with the assumption that particles
  which are opposite to an observed jet have
  likely travelled through (or been formed in) the
  CP-violating region.

Observed jet
? - ? pair
5
Possible Method

• Find one (or two close) high pT track(s).
• Look opposite to this track within some range for
  an away side ?-? pair and look for correlations
  in the helicities of this pair.
• To estimate possible signal (Feis talk)
• Count away side pairs in d-Au events. Binary
  scale this number to Au-Au and this defines the
  total of pairs per event which will carry
  signal.
• Count away side pairs in Au-Au events. This
  gives the total number of signalbackground pairs.