General Meson SF Meeting Summary 6/14/21

PARTICIPANTS: Bill Li, David Richards, Garth Huber, Patrick Barry, Petr Stepanov, Rachel Montgomery, Richard Trotta, Rolf Ent, Stephen Kay, Tobias Frederico, Tanja Horn

PLANNING DETECTORS 2ND IR (Bill, Yulia, Dmitry)

• ZDC in IR2 on outer side (on inner side in IR6)

• IP8 released on June 7th. Fully implemented in g4e, EIC-root, and Fun4all

• rear detectors no optimization efforts yet - not aligned properly
• Configuration looks good. 275 GeV beam steers well - need to demonstrate that also for lower beam energies

• ZDC 50 GeV pi0 @IP6 (IP8)

• Fun4All specific issues

• ZDC 2m long - interferes with ionBXD magnet - need to investigate impact of moving ZDC forward etc.

• Virtual detectors in 2nd IR

• implemented in IP8 beamline (yellow planes)

• Main Actions

• Beam profile at the secondary focus
• Investigate lower beam energies - scale magnets for lower energies

• Additional actions shown in slides

GLOBAL FITTING (Patrick)

• Good progress with global fitting including lattice points to examine JLab data - get better constraints

• DY+LN+lattice studies

• Valence distributions: most impact at intermediate x - lattice doesn't have much impact at low x (~0.15) and high x (~0.95)
• main interest in impact on current-current data

• NLO, still could look at threshold resummation - lattice probably not as sensitive as data since coefficients in matching regions are well behaved

MESON SF and FF PROJECTIONS (Richard, Stephen)

MESON SF

• Optimized binning setup

• Corrected a bug in t-distribution

• Investigating a cut at t~0.1 GeV that should not be there

• Setting up Fun4All simulation campaign

• Encountered some errors with output files as input to EICSmear
• Limit on set is ~5000-10000 events - more detail on how to run in ECCE simulations/computing meeting

MESON FF

• Event weighting: EICSmear and Fun4All cannot deal with weights associated to events - need that for rate projections

• Exclusive generator (DEMPGen) ready, counter for event rejection statistics, produced several beam energy combinations

• Kaon Generator

• modifying pion generator
• next: phase space, detector optimizations (resolution, positioning)

• Action

• run kaon/lambda with both IP6 and IP8 - expect results to be different

THEORY (Tobias)

• Finalized a paper on pion form factor

• Ongoing effort: Working on PDFs with Minkowski space formalism

• one gluon exchange - might expect similar behaviour as lattice

NEXT MEETING: MONDAY 28 JUNE AT 4:00 PM ET