General Meson SF Meeting Summary 6/28/21

PARTICIPANTS: Ali Usman, David Richards, Douglas Higinbotham, Garth Huber, Patrick Barry, Richard Trotta, Tanja Horn, Stephen Kay, Rolf Ent, Tobias Frederico, Thia Keppel

DISCUSSION DETECTOR PLANNING

• Update from Yulia on coordinate system to use for detector setup (mainly for ATHENA or IP6, ECCE could use different approach, please, check! … ):

• Right handed system.
• Z: Electrons goes along Z axis towards negative Z values ( 0,0, -1)
• Y: point to the sky
• X: Protons goes as ( -sin(a), 0, cos(a)) , where a- crossing angle , and crossing goes towards negative X.

• Additional information on IR layout (Rolf)

• Electron beam inside, ion outside
• Coordinate system chosen for earlier images, e.g., CDR is different

• No immediate impact on generators or Geant4 simulations

• this is about the coordinate system, nothing wrong with analysis!

• Also ongoing work on IP8 Secondary Focus nucleon momentum fraction (x_L) coverage - optimizing the transverse momentum p_T coverage vs. x_L (similar to what was done in JLEIC) - expect an update at the next IR2 meeting

• Action item:

• detector positioning studies with virtual planes

UPDATES MESON SF AND MESON FF

• Meson SF (Richard, Rachel)

• ran events through eicsmear/Geant4 (Fun4All), resolving issues with transport - do not see events in any of the FF detector
• on generator level ongoing work to analyze t distributions
• Action item:

• analyze events from Geant4 for IP-6/IP-8
• update on t-distribution

• DEMP generator events (Stephen)

• ran events through eicsmear/Geant4 (Fun4All) and analyzing events detected in the ZDC - looks reasonable

• Action item: resolve why no events in off-momentum or Roman pot detectors

• Kaon FF studies (Ali)

• Use DEMP for kaon generation: KL and KSigma
• Run generated events through eicsmear/Geant4 simulation - analyzed phase space distribtutions, no weights yet
• For KL identification - start with neutral decay here - not clear if need off-momentum and RP detectors in that case

• Action item: investigate why some KL and KSigma plots look different in phase space (no weights applied)

UPDATES ON GLOBAL FITTING, LATTICE, THEORY

• Ongoing efforts on PDF analysis for TDIS

• Would like the Q2 bins assumed for the TDIS proposal

• Lattice efforts ongoing

• Theory DSE efforts ongoing

NEXT MEETING: MONDAY 12 JULY AT 4PM ET