View source for General Meson SF Meeting Summary 9/30/21

PARTICIPANTS: Richard, Garth, Tanja, Stephen, Rolf, Patrick

'''MESON SF''' (Richard)

* working on 5 on 41 ZDC distributions - appears to be a problem with the simulation processing

* Technical note for diffractive reactions - updating uncertainties with Patrick

* for IP8: still work on going on component implementation - B0
::* B0 needed for proton, e.g., ppi channel and pi0n
::* have optics for B0 - full magnet will not be available in next few months
::* does simulation have B0 optical properties implemented?

* ZDC placement - similar to IP6 driven by need to capture 6mrad cone
::* aperture given by limit of each IP (4.5mrad for IP6 and ~6mrad for IP8)
::* due to mechanical interference moves a little closer for IP8

* Decay length kaon important for Lambda - need geometric acceptances

* compare geometric detection fractions for two IPs
::* optics different by IR
::* t-resolution would change

* Differences - need to look for planes in the different detection planes

* '''Action items''':
::* check on B0 implementation, aim to get the ZDC distribution -> get t-dependence
::* geometric acceptance - might get from G4e - check with Yulia on status of virtual planes for IP8 and possibility to get geometric acceptances for kaon


'''PION FORM FACTOR''' (Stephen, Garth)

* Plots for 
::* W-Q2: very different from fixed target
::* detection efficiencies with cuts applied to reduce inclusive background: ~80%
::* detection efficiency Q2 vs. -t: shows where hit edges of the ZDC

* Pion FF updated plot

* Next: IP8


'''KAON FORM FACTOR''' 

* Ali studied the exclusive K-L channel
::* no lambda decay 

* Action items:
::* include lambda decay


'''PDFS WITH LATTICE PLUS GLOBAL FITTING''' (Patrick)

* studies of systematic uncertainties when fitting data
::* finite volume not important compared to lattice spacing and power correction - remove from fit

* Noticeable impact of including lattice uncertainties on uncertainties of valence quark distribution

* Impact of current-current data
::* reduce uncertainties by 50% and 10% - same impact - indicates that experimental data is the bottleneck


'''NEXT MEETING: THURSDAY 14 OCTOBER AT 5PM ET'''