[G12] Minutes from 4/21/2010 meeting

[Craig Bookwalter]

Hi folks,
  Had a long one today. Minutes are at the following link, and pasted below:
 
  http://clasweb.jlab.org/rungroups/g12/wiki/index.php/21Apr10


    April 21, 2010 Agenda

    * Paul: Delta++
      <http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Eugenio>
    * ODU KKp analysis <http://www.jlab.org/%7Eweygand/g12_talk.pdf>
    * Gagik's Missing Tracks / 3pi yield update
      <http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Charged_3pi#Gagik.27s_Missing_Tracks>

    * Omega cross-section update
      <http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Rough_omega_cross-section_calculation#Number_of_incident_photons>

    * Phi-Eta & Sideband
      <http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Strangeonia>

[edit 
<http://clasweb.jlab.org/rungroups/g12/wiki/index.php?title=21Apr10&action=edit&section=2>]


    Minutes

    * Attending: Diane, Craig, Moskov, Dennis, Valery, Stacey, Mike P. x
      2, Will, Heghine, Carlos
    * Paul presented some new results from his Delta++ 3pi analysis,
      including t-slopes as well as a selection on t. The a2 is clearly
      visible but nothing else is sticking out at this time.
    * Paul also presented a number of plots from his Delta++ K+K-pi-
      analysis. The K* looks good, and there may be possibilities for
      K*K intermediate states as well as f2-pi. However, statistics are
      pretty low at this point.
    * Johann shows some plots indicating that particles lose energy and
      momentum after passing through gsim. It is not clear whether
      energy loss corrections are applied in reverse by gsim by default.
      Also, it would be nice to have a function that would return the
      magnetic field at a point in space so that we could ensure that
      the magnetic fields used by a1c and gsim are identical. General
      insecurities surface about what constants gsim is using, whether
      they come from run 1 or run 10 and whether the appropriate
      constants from a good g12 run have been copied to the appropriate
      places in runs 1 and 10.
    * Moskov shows his results from his pentaquark search. He sees a
      similar enhancement in g12 data at 1.54 GeV as to what was seen in
      g11. The old questions remain: is the peak real, or is it an
      artifact of the limiting phase space? Questions were also raised
      regarding:
          o t-cuts between g11 and g12
          o normalization between g11 and g12 distributions for comparison
          o peak disappears in g12 without ebeam cut...?

Could we see the theta-phi interference in a PWA? Hrmmm...