Download han_report_1feb2015

Some Hyperon Correlation
Questions
H. A. Neal
February 11, 2015 Group Meeting
Some Questions from Homer (pg1)
QUESTION
Why do we think L L is a good
template to use in examining L L
correlation results? What does the
ratio test?
How can the detector know
anything about a correlation
between q1 and q2 if it can not tell
the difference between q1 and q2 ?
Why do we use D-R to present our
results when everybody else uses
Q?
Doesn’t symmetry force our
measured correlation for L L to
be zero?
Some Questions from Homer (pg2)
QUESTION
The correlation formula that we use ->
< C1 > < C2 > - < C1 C2 >. Is it proper to
use this as a “probability”? It is not
bounded. If there is a correlation, it
will grow with the “C’s”
Concerning the above, would it make
sense to divide by< C1 > < C2 > + < C1
C2 >?
Is the shape-change Tom sees near DR
= .1 due to the onset of Fermi-Dirac/
Bose-Eintein statistics (see other
papers)
What have we learned from the
generator-level MC results
What is the correct pdf to use?
• f1 = (1/2) ( 1 + a q1 cos( Q1 ) )
• f2 = (1/2) ( 1 - a q2 cos( Q2 ) )
• …and for small correlations … f1 * f2 (?)
• F = (1/4) { 1 - a q2 cos( Q2 ) + a q1 cos( Q1) + a2 q1 q2 cos (Q1 ) cos(Q2
)}
• How can we trust F to give us some idea of the Q1 - Q2 correlation
when we find significant “polarizations” that we know shouldn’t be
there?
Delta-Eta Distribution
Lambda - Lambdabar
Lam - Lam
Effective mass distribution
Lambda - LambdaBar
Lam-Lam
Theta1 for
proton in LamLambar
Theta2 for antiproton in LamLambar
Lam-Lam theta1
Lam-Lam theta2
Correlation vs R-Band .09875
Lam - LamBar
Lam- Lam
Correlation vs R-Band .03625
Lam-LamBar
Lam - Lam