General Meson SF Meeting Summary 8/2/21

PARTICIPANTS: Garth Huber, Patrick Barry, Petr Stepanov, Richard Trotta, Stephen Kay, Tobias Fredericko, Tanja Horn, Rolf Ent, Ali Usman

MESON FORM FACTOR (Stephen, Ali)

• Evaluation of data from pass-through simulation for ECCE

• kinematics quantities included in analysis
• need beam information

• Scattered electron

• covers both electron endcap and barrel
• most events in electron endcap ~130 deg and above
• raidative tail beyond 135 deg

• Strong correlation in pi+ and electron truth vs track, px vs py comparison

• some correlation expected (solenoid field)

• Action items:

• implement smearing and additional studies
• explore pass-through Athena simulation framework

MESON STRUCTURE FUNCTION (Richard)

• Plan for meson SF validation studies

• produce the first benchmarks with EicRoot(Alex)/Fun4All(Richard) with a single beam energy and reasonable event sub-sample (something which can run fairly quickly, probably < 100k events).
• repeat the process with DD4HEP
• decide on a path forward for a larger sample, and look at perhaps the lowest and highest beam energies back to back to see how the detector subsystem acceptance/overlap regions change with energy (e.g. in e+p DVCS the B0 is the most-important at low energy, the Roman Pots at high energy - it's good to know which detectors are needed for which energy/physics channel).

DETECTOR PLANNING FOR PROPOSALS

• Discussion of possible processes that really benefit from second IR, high-x, low-t

• For pion form factor: pi0/proton for experimental background studies and model constraints
• For kaon SF studies: L/S0 ratios

LATTICE/GLOBAL ANALYSIS (Patrick)

• EIC impact study - variation of splitting function regulator

• seems to have large impact on valence and gluon
• high/low limit to indicate theoretical uncertainty

• Ongoing: Exploring impact of TDIS JLab data on valence/gluon distribution

THEORY (Tobias)

• Work on PDFs ongoing

NEXT MEETING: MONDAY 23 AUGUST AT 4PM ET