These figures were produced (4/97) by Tom Trainor using Duncan Prindle's
display program QCDISPLAY applied to VENUS 5.21 output data files.  The
events are Pb-Pb fixed target at 158 GeV/nucleon with a range of impact
parameters.  The event shown here in most figures has b = 3.2 fm.  Point
positions are the formation points.

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Color flag definitions for first six figures -

point (x,y,z), (px,py,y) colors: 

blue - mesons

yellow - baryons

purple - light exotics

red - heavy exotics

line colors:

1) momentum vectors in configuration space

orange - mesons

tan - baryons

cyan - light exotics

violet - heavy exotics

2) parentage lines in momentum space

violet - mesons

orange - baryons

tan - light exotics (few quarks)

fleshtone - heavy exotics (many quarks)

Note on coordinate variables: In either configuration or momentum space 
coordinates are in `rapidity' variables (which corresponds to standard 
rapidity for p_z). The `mass' for momentum variables is taken as 1 GeV/c^2 
and the corresponding `mass' in configuration space is 3 fm. This just 
establishes the breakpoint in each case between linear and log behavior for 
visual purposes.

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These five figures are from a single VENUS Pb-Pb event in the N-N CM, with 
b = 3.2 fm. 

venus1.jpg

This figure shows configuration-space points with momentum vectors 
attached, standard color scheme looking almost along z.

venus2.jpg

Same as venus1 with momentum vectors turned off. 

venus3.jpg

Same as venus2 but reoriented to show extension along z and fireball of 
exotics (prehadronic clusters of multiple quarks - up to 250) at the 
center.

venus4.jpg

Long view in configuration space, similar setup to venus1 with momentum 
vectors.

venus5.jpg

View of momentum space perpendicular to rapidity (z) axis with parentage 
lines included.

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Color flags for figure 6:

dk blue - final state mesons (except phase2 space where these are baryons)

yellow - final state baryons (except phase2 space where these are mesons)

violet - light exotics: light multiquark combinations with q number >3

lt green - heavy exotics: heavy multiquark combinations with up to several 
hundred quarks.

cyan (lt blue) - intermediate state mesons

red - intermediate state baryons

orange - strange mesons

dk green - strange baryons

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venus6.jpg -  (yl,yt,tt) looking down and along the tt axis.

phase2 space (yl,yt,tt) is a newly defined space in which yl is 
the standard longitudinal rapidity defined in the transverse CM, yt is a 
transverse rapidity defined for each particle in its longitudinal (boost) 
center of mass (pl = 0) and tt is a time measure defined by analogy with 
rapidity in such a way that it is linear in time for early times and 
logarithmic in time for later times, with a break time selected here to be 
about 3 fm/c. For typical pt values yt is essentially pt/m = beta*gamma. 
Thus, if all particles were freely expanding with the same beta they would 
all have the same yt or beta, as opposed to a thermal system where the pt 
spectrum is nominally mass independent.