General MWG Meeting Summary 2/25/20
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PARTICIPANTS
On site: Y. Furletova, R. Ent, R. Trotta, D. Romanov, T. Horn
Remote: (morning) M. Diefenthaler, G. Huber, W. Lee; (afternoon) G. Huber, S. Kay, T. Hobbs
INTRODUCTION
- Detection fractions
- in Eur.Phys.J. A55 (2019) no.10, 190 article (arXiv:1907.08218) used geometric acceptance - standard Pythia and accept all particles that go forward
- now can do real detection with IR
- Can detect forward-going particles, but how to distinguish decay products, e.g. lambda
- Structure functions
- for projections use a Fast Monte Carlo that includes the Sullivan Process
- PDFs, form factor, fragmentation function projections
- progress with generator development since EPJA article:
- fixes made in generator to remove fixed-target leftovers (Richard, Arun, Tim)
- now can make pion structure function (pion SF) projections
SUMMARY NOTES
STATUS OF GENERATORS
- Presentation of Fast Monte Carlo components - example: pion "target"
- All standard DIS
- Beam smearing function - dp/p ~10^-4. Changes needed, e.g. value based on beam sigma?
- Two fixed target restrictions were removed. There may be more...
- Discussion of validation plots - HERA reduced cross section data and comparison with simulation and GRV fits
- Simulation and data seem consistent
- No obvious Q2 dependence
- GRV fits both data and simulation
- Does CTEQ include pions?
DETECTION FRACTIONS
- For neutron final state use ZDC -> need to know detection fractions, for Lambda/Sigma need in addition detection of particle
- Have the beamline CAD - generally looks similar to JLEIC
- Currently only have Roman Pots in forward region - ok for DVCS, but need more detectors for meson structure measurements
- General approach: put virtual detectors at different z-locations in between the magnets - based on this determine what space is needed for these additional detectors
- Background fractions: to determine DIS background could run min bias Pythia
DETECTOR MONTE CARLO - IR UPDATES WITH eRHIC SPECIFICS
- Need to update electron beam line
- Solenoid centered at zero - this cannot be changed as it affects the beamline
- Note that IR region was the same size for JLEIC and eRHIC design, so can use JLEIC detector in eRHIC beam line modulo beam line required changes in end caps, crossing angles
ACTION ITEMS
- Overall: Collect slides and other documentation
- Workplan
- Get C++ code running
- Make Analyzer plugin for physics variables including smearing - needed to get output from Fast Monte Carlo for tracing through detector MC
- Implement virtual detectors and determine detection fractions
- First rough projection of detection fraction
- Determine where detectors should go
- Come up with a method to distinguish decay products, e.g. Lambda and Sigma0
- start with proton in final state for validation of analysis chain, then go to neutron and K/Lambda/Sigma
- Simulation details
- In Table on last slide check the value of F2pi for bin x=0.95. Figure out why the error bar doesn't grow more in large-x bins (x=0.85, 0.95)
- Check that detection fractions are included
- Check that all final states included in LUND file output
- Check crossing angle - should be eRHIC
- Include cut on y: (0.01, 0.95)
- Automate scripts so that can run large number of bins
- Set up generator for kaons
- For beam energies use: 18 on 275, 10 on 100, 5 on 41 (and to check from WP: 5 on 100)
- Next Meson SF meeting: 16 March at 4pm ET
- Upcoming Meson SF Meetings:
- Working meeting on 13 April at JLab
- Dedicated Workshop on Pion and Kaon Structure Function at the EIC at CFNS, June 1-5, 2020