General Meson SF Meeting Summary 11/5/21

PARTICIPANTS: Bill, Patrick, Richard, Stephen, Tanja, Rolf, Tobias, John, Huey-Wen

EIC IMPACT STUDIES (Patrick)

• re-performed fits cutting out high xL values

• results seem to suggest a large impact - larger than expected based on previous results in paper

• currently using un-correlated uncertainties - may be driving since losing the uncertainty due to having different data sets

• problem with global fits in region with no data

• if only point-to-point

• move within 1 sigma but have many points from same data set --> goes to one line/value driven by this, c.f., CLAS data
• normally have more than one data set that also includes a scale uncertainty

• Action items:

• make a small point-to-point, e.g., 0.1-0.2% (luminosity) and rest normalization (~1%)
• reduce number of data points - improvement of TMDs/kT etc.
• small documentation of what's different from the YR, e.g., figures with captions

FAR FORWARD DETECTORS OCCUPANCIES (Richard, Bill)

• After fixed generator and EIC-smear (discrepancy between the two - may be related to calculation of momentum) and with B0 included

• 5 on 100 and 10 on 100 show same occupancy at ZDC
• For 5 on 41 losing acceptance ~59% detection efficiency

• optics different from YR where had no B0 - now have more hits in B0 and losing events

• Consider event generator to be validated and final - postpone any additional tweaking until later

• Calculate t distribution in the Fun4All framework

• Input to EIC Impact Studies: Q2, x, xL, y, number of events (100 fb^-1)

• number of events currently determined by ZDC
• if include t-dependence then need RP and OMD

• Note on Kaons: Fun4all does not decay Lambda correctly - branching ratio wrong

• decay length - energy different
• not due to obstruction in beam pipe

• Action items:

• Occupancies for IP6 to compare with geometric acceptances in YR
• Occupancies for IP8 can be done to check geometric acceptances of IP6 vs. IP8
• t-resolution in fun4all framework to check impact on t for IP6 vs IP8 on FF and SF

• reconstruction of kinematic variables

• Kaons - will still pursue, but may not be part of the proposals

• check with Dmitry and Yulia about kaon decay modules used during YR

NEXT MEETING: THURSDAY 11 NOVEMBER AT 5:00PM ET