The N* working group met at CEBAF on May 4, 1997, from 9:00 AM to 1:00 PM. Volker Burkert led the meeting, and began with listing a set of topics for discussion. He pointed out that the e1 run group is scheduled for 64 days starting in Sept. 1997.

There was some discussion of reactions that could be used to measure the CLAS acceptance for the N* reactions, using real beam data. Good candidates are

ep --> e (p)
ep --> p (e)

where the particle not in parentheses is the one used in the trigger and the kinematics of the one in parentheses can be predicted.

Other possibilities are

ep --> ep pi- (pi+)
ep --> ep pi+ (pi-)
ep --> e pi+ pi- (p)

where the particle in parentheses can be predicted from the kinematics of the other charged particles.

Dennis Weygand pointed out there is a need for a fast MC to simulate the data. This let into a discussion of the status of the GSIM program. A group of people volunteered to work on the GSIM program:

Maurik Holtrop
Dennis Weygand
John Price
Paul Stoler, Tom Mattson
Ralph Minehart, Dale Conwell (Master's degree student)
Kyungseon Joo

Maurik Holtrip is coordinating this effort.

There was some discussion of how to organize the data. Volker pointed out that the DST tapes are not yet defined. Much more work is needed in this area.

It was agreed to set up an N* web page. Latifa Elouadhriri is leading this effort.

The following is a summary of presentations made to the meeting. Details of these reports should be obtained from the presenters, who are also encouraged to place reports on the N* web page.

Latifa presented a report on her work to use AO to calculated resonances with a set of Born term backgrounds. The cross sections generated in this way were fed into an analysis program that uses an energy dependent parametrization of the background. The results of the analysis were excellent in terms of extraction of the resonance strengths in agreement with those used in the AO calculation. She found it necessary to split the analysis into two regions, the delta region and the higher mass region, using one as input to the analysis of the other.

Stepan Stepanyan reported on work at Yerevan to develop a dispersion analysis of single pion electroproduction.

Marco Ripani presented extensive results on simulation studies of two pion decay of electroproduced resonances.

Steve Dytman discussed the Pittsburgh program to re-analyze the reaction pi N --> pi pi N, using a coupled channels approach. This analysis is close to completion. He has no student presently available for a study of the electroproduction of pi N resonances, but that is their next step.

Ralph Minehart presented some results on radiative corrections to the electroproduction of single pions, using AO as the model cross section. These results indicate that when tight cuts are made on the missing mass of the unobserved neutral particle in the hadronic final state, changes in the measured angular distribution of the resonance induced by the radiative process are small.

Ralph Minehart agreed to be the coordinator for the group. The next meeting will be June 30, 1997.