Kaon_LT Experiment

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h1. *Kaon LT Meetings*

Kaon LT collaboration analysis meetings. Please add your talk to the meeting ahead of time. Add the newest meeting to the top of the list!

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h2. 2020 Meetings

h3. June 24, 2020

*Links to talks->* "Vijay":https://redmine.jlab.org/attachments/download/1006/Vijay_9_June_20.pdf "Ali":https://redmine.jlab.org/attachments/download/1007/KaonLT_Meeting_Jun_9.pdf "Richard":https://redmine.jlab.org/attachments/download/1013/KaonLTMeeting_6_24_20.pdf

Next meeting July X @ 4:30 EST

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h2. 2020 Meetings

h3. June 9, 2020

*Links to talks->* "Vijay": "Ali": "Stephen": "Richard":https://redmine.jlab.org/attachments/download/1005/KaonLTMeeting_6_9_20.pdf

Next meeting June 24th @ 4:30 EST

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h3. May 27, 2020

*Links to talks->* "Vijay":https://redmine.jlab.org/attachments/download/1002/Vijay_26_May_20.pdf "Ali":https://redmine.jlab.org/attachments/download/1003/KaonLT_Meeting_May_27%20%5BAutosaved%5D.pdf

Next meeting June 9th @ 4:30 EST

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h3. May 13, 2020

*Links to talks->* "Stephen":https://redmine.jlab.org/attachments/download/993/KaonLT_Meeting_13_05_20.pdf "Richard":https://redmine.jlab.org/attachments/download/998/KaonLTMeeting_5_13_20.pdf "Ali":https://redmine.jlab.org/attachments/download/997/KaonLT_Meeting_May_13.pdf "Vijay":https://redmine.jlab.org/attachments/download/999/Vijay_13_May_20.pdf

Next meeting May 27th @ 4:30 EST

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h3. April 29, 2020

*Links to talks->* "Richard":https://redmine.jlab.org/attachments/download/984/KaonLTMeeting_4_29_20.pdf "Stephen":https://redmine.jlab.org/attachments/download/985/KaonLT_Meeting_29_04_20.pdf "Mark's hcana tracking update":https://redmine.jlab.org/attachments/download/982/Updates-to-HCANA-tracking.pdf

Next meeting May 13th @ 4:30 EST

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h3. April 15, 2020

*Links to talks->* "Richard":https://redmine.jlab.org/attachments/download/977/KaonLTMeeting_4_15_20.pdf

Next meeting April 29th @ 4:30 EST

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h3. April 1, 2020

*Links to talks->* "Stephen":https://redmine.jlab.org/attachments/download/949/KaonLT_Meeting_01_04_20.pdf "Richard":https://redmine.jlab.org/attachments/download/948/KaonLTMeeting_4_1_20.pdf

Next meeting April 15th @  4:30 EST

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h3. March 18, 2020

*Links to talks->* "Richard's EIC Temple Draft 2":https://redmine.jlab.org/attachments/download/942/DRAFT2_mesonSF_EIC_Temple.pdf

Next meeting April 1st @  4:30 EST

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h3. March 11, 2020

*Links to talks->* "Ali":https://redmine.jlab.org/attachments/download/940/KaonLT_Meeting_Mar_11.pdf "Richard's EIC Temple Draft 1":https://redmine.jlab.org/attachments/download/941/DRAFT1_mesonSF_EIC_Temple.pdf

Next meeting March 18th @  4:30 EST

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h3. Feb 26, 2020

* Peter's changes to hcana should be coming soon. Richard will check with Mark when he is down there for an update.

* Need to incorporate the latest "BCM updates":https://hallcweb.jlab.org/doc-public/ShowDocument?docid=1034 from Dave Mack.

* Richard should look at the luminosity scalar analysis before and after the BCM changes once he gets his script working again.

**  He is checking with Mark about this while he is down in jlab. 

Next meeting March 11th @  4:30 EST

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h3. Feb 10, 2020 

Next meeting Feb 26th @ 11 am EST

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h3. Jan 22, 2020

*Links to talks->* "Richard's Hall C Winter Talk Draft 1":https://redmine.jlab.org/attachments/download/937/KaonLTHallC_WinterTalk2020_Draft1.pdf

Next meeting Feb 10 @ 11 am EST

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h3. Jan 15,2020

*Links to talks->* "Richard's Hall C Winter Talk Outline":https://redmine.jlab.org/attachments/download/936/KaonLTHallC_WinterTalk2020.pdf

Next meeting Jan 22 @ 11 am EST

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h3. Jan 8,2020

*Links to talks->* "Richard":https://redmine.jlab.org/documents/76

* Richard

** PID efficiency script is coming together

*** Tighter cuts and cuts on timing, beta, etc. will be needed for cleaner electron cuts

*** Hcal cut should be changed to cut around the mean normalized value instead of cutting above or below it only. This will assure electrons aren't lost.

Next meeting will be January 15th at 4 pm EST 

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h2. 2019 Meetings

h3. Dec 17,2019

Reminder: Mark Jones' commissioning analysis meetings are bi-weekly and announced by Mark

* Stephen

** Number of passes finished for HMS calorimeter

*** Still wiggles in all passes

** Finished his report on calibrations, "DC and Calorimeters":https://redmine.jlab.org/documents/74

** Put together a list of people's jobs from Regina over the next couple of months, "Regina Analysis Tasks":https://redmine.jlab.org/documents/75

*** CUA will be putting together a similar list

* Richard

** Fixed one error issue with SHMS calorimeter calibration code (discussed Dec 10th meeting), but still have one error

** PID efficiency script plots are complete, but still some questions he needs to work out before a final version

*** Eventually need to include tracking into PID efficiencies

** Pete brought up the question for a number of multi-hits we are getting

*** (Dead Time)+(Trigger efficiency)-EDTM

Next meeting will be after the break; Wednesday, January 8th at 3 pm EST

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h3. Dec 10,2019

*Links to talks->* "Richard":https://redmine.jlab.org/documents/73

* Garth and Stephen were in the most recent SIDIS meeting

** Wit had lots of hcana changes but they seem to be critical to our work 

*** Changes such as new detector classes

** Hopefully Wit will present these in the next commissioning meeting

* Stephen improved wiggles but still prevalent

* Richard finished HGCer calibrations, he concluded that the online parameters are sufficient

** He also has been looking at SHMS calorimeter calibrations but has had issues running the scripts. Most likely a pathing issue.

** The "tasks":https://redmine.jlab.org/projects/kltexp/wiki/Analysis_Tasks page has been updated with a section for efficiencies. 

*** A PID efficiency script is currently being developed and hopefully should have some plots for our next meeting.

* Next meeting will be December 17th at 3 pm EST.

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h3. Nov 26,2019

*Links to talks->* "Richard":https://redmine.jlab.org/issues/480

* Stephen

** DC SHMS, small-angle has poor performance

*** Tighter cuts or PID (currently only looks for electrons)

** Vardan said calorimeter wiggles are an ongoing issue with no current solution

* Richard

** The calibrations are nearing completion with only the HG Cherenkov and SHMS calorimeter yet to be finished. There are also smaller issues with some DC and HMS calorimeter runs.

*** Richard will pick up looking at the HGCer calibrations from Vijay's scripts. 

*** Richard will also be looking at the SHMS calorimeter and with the suggestion of getting some negatively polarized SHMS runs from Hem.

** The HMS Cherenkov is finished with the conclusion that the calibrations from the online runs are good

** We can begin looking forward towards efficiencies. 

*** Garth suggested that looking at PID may be an advantageous first steps. Precise definitions of these PIDs will need to be logged.

*** Clear notes on efficiencies steps will be needed. They will need to be redefined multiple times in multiple ways. 

* Hem

** Has been looking at the calorimeter as well. 

** He has seen the second band in the spectra for some runs, we suggested further looks into HMS hodoscope and subsequently reference times. A recalibration will need to be performed.  

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h3. Nov 19,2019

*Links to talks->* "Stephen":https://redmine.jlab.org/issues/500 "Richard":https://redmine.jlab.org/issues/500

* Richard

** Finished up TDC cut paper going through the procedure (found "here":https://redmine.jlab.org/issues/500)

** Needed to add Carlos pre-trigger designs to an appendix for the paper which clarifies the introduction section

* Stephen

** Issues with DC calibration for only a few runs during each run period

** "wiggles" in HMS calorimeter calibrations for some runs

*** few runs where HMS cal totally failed (which was dependent on initial parameters)

*** Spring looked worse than the rest (surprisingly), but this may be because online calibration wasn't great

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h3. Nov 5,2019

*Links to talks->* "Stephen":https://redmine.jlab.org/issues/500

* Timing update (Stephen)

** Reference times between Richard and Stephen are very similar and the GitHub is updated accordingly

** Richard is going to add the trigger time cuts once the fall runs are finished (by end of week)

** First pass of detector reference time parameter files finished

* Peter's hcana code (Richard and Stephen)

** Peter's code does not remove ghost bands (already known), but now Stephen is seeing a strang horizontal band for just SHMS hodoscope 2D plots

*** Richard has emailed Peter about the issue with no response yet (follow-up soon)

** This means we still need the reference time amplitude cut with Peter's code but using just the amplitude cut with Mark's latest version of hcana should be sufficient for calibrations.

* Calibrations were decided to be done once per shift

* Next meeting schedule...

** Small meetings Nov 12 and Nov 19 (at 3pm EST) so Richard and Stephen can iron out the timing and calibrations

** November 26 (at 3pm EST) will be a larger meeting. 

*** This is the rough deadline we made for finishing up calibrations. 

*** This should be sufficient for all detectors (although hodoscope and HG which may persist). The ultimate goal is for all calibrations to be finished up before Winter break!!

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h3. Oct 22,2019

*Links to talks->* "Stephen":https://redmine.jlab.org/issues/500 "Richard":https://redmine.jlab.org/issues/500

* SHMS Reference Time Amplitude Cuts(Stephen)

** Extra peaks in HG from cross-talk and "ghost-bands" due to ADC screw up

*** cuts applied on SHMS ADC ref time amplitude (greater than zero) done before any further event selection and histogram filling

** This is a temporary fix to "ghost-bands" and cross talk

*** Although for HG there is still a small peak. The hodoscope is fine.

** The time window is easier to set now.

** DC has been fine (since it uses TDC)

*** DC calibrations should be good to complete, other detectors need more fixes (i.e. the remaining "ghost-band")

** Hodoscope still bad but this might be because of that "ghost-band", needs to be further investigated

* Peter's hcana fixes for reference time (Richard)

** Peter implemented changes to hcana

** Two major issues...

## Amplitude goes to null and integral is low or negative which causes a rate-dependent efficiency. 

*** Peter has used the average pulse value acquired over a large sample of runs for each detector. 

## Timing offset between EL-REAL and 3/4 is 130 ns which causes junk tracks at high SHMS rates (~6% of the time)

*** Peter created a routine to find the best offset by means of matching TDC and ADC

** Richard has been checking for bugs in the code. 

*** It seems to be ready to implement, Richard emailed Peter for confirmation on the implementation in our group directory

* Calibration of HMS detectors when the timing is agreed upon by Stephen and Richard.

** Besides hodoscope which still has an issue with the script

** Stephen and Richard are having a meeting late next week to determine time window values

*** These will be relatively final, but on the wider side if adjustments need to be made in the future

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h3. Sep 24,2019

*Links to talks->* "Stephen":https://redmine.jlab.org/issues/500 "Richard":https://redmine.jlab.org/issues/500

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h3. Sep 10,2019

*Links to talks->* "Stephen":https://redmine.jlab.org/documents/69 "Ali":https://redmine.jlab.org/documents/72 "Richard":https://redmine.jlab.org/issues/500

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h3. August 26, 2019

*Links to talks->* "Stephen":https://redmine.jlab.org/documents/69 "Ali":https://redmine.jlab.org/documents/70 "Vijay":https://redmine.jlab.org/documents/71 "Richard":https://redmine.jlab.org/issues/500

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h3. June 21, 2019

*Links to talks->* "Hallc Talk Outline":https://redmine.jlab.org/documents/60 

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h3. June 14, 2019

*Links to talks->* "Hallc Talk Outline":https://redmine.jlab.org/documents/60 "Mireille":https://redmine.jlab.org/documents/64 "Update-Mireille":https://redmine.jlab.org/documents/65 "Vijay":https://redmine.jlab.org/attachments/download/814/Analy_update3.pdf

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h3. June 4, 2019

*Links to talks->* "Stephen":https://redmine.jlab.org/documents/56 "Nathan":https://redmine.jlab.org/documents/57 "Vijay":https://redmine.jlab.org/documents/58 "Richard":https://redmine.jlab.org/documents/59 "Hallc Talk Outline":https://redmine.jlab.org/documents/60 "Mireille":https://redmine.jlab.org/documents/61

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h3. May 21, 2019

*Links to talks->* "Richard":https://redmine.jlab.org/documents/52 "Mireille":https://redmine.jlab.org/documents/? "Stephen":https://redmine.jlab.org/documents/53 "Nathan":https://redmine.jlab.org/documents/54 "Vijay":https://redmine.jlab.org/documents/55

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h3. May 14, 2019

*Links to talks->* "Richard":https://redmine.jlab.org/documents/48 "Carlos' slides":https://redmine.jlab.org/documents/49 "Mireille":https://redmine.jlab.org/documents/50 "Stephen":https://redmine.jlab.org/documents/51

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h3. April 30, 2019

*Links to talks->* "Richard":https://redmine.jlab.org/documents/45 "Richard's slides in wiki":https://redmine.jlab.org/projects/kltexp/wiki/Analysis_How-To "Brad Computing":https://redmine.jlab.org/documents/46 "Stephen":https://redmine.jlab.org/documents/47

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h3. February 4, 2019

*Links to talks->* "Richard":https://redmine.jlab.org/documents/43 "Stephen":https://redmine.jlab.org/documents/44

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h2. 2018 Meetings

h3. August 21, 2018

*Ongoing Tasks->* #381 #382 #383 #404 #405 #406

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h3. August 8, 2018

*Ongoing Tasks->* #381 #382 #383 #404 #405 #406

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h3. August 3, 2018

*Ongoing Tasks->* #381 #382 #383

*Links to talks->*

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h3. July 11, 2018

*Ongoing Tasks->* #381 #382 #383 #384

*Action items:*

* Update run plan, e.g. add prescales (Garth)

* Check on details of: magnet cycling procedure, minimum angles, MCC fringe field steering, beam energy measurements, optics checks (Tanja)

* Identify additional run coordinators (Tanja)

* Encourage collaborators to take shifts, e.g. FIU (Pete)

* Draft email about shifts etc. to collaboration (Tanja)

* Develop diagnostic scripts and kaonLT specific (Richard, Ryan)

* Continue documentation development, e.g. checklist, shift taker instructions, HowTo or link to generic Hall C HowTo, task list, web page (Richard, Garth)

*Discussions:*

* SHMS Aerogel Cherenkov: tray has been changed to SP-11 on 10 July, nominal time for change is 8 hours, one tray can stay in the hall to minimize overhead

* HGC: waiting for re-installation

* Trigger checkout: main items to keep in mind: fADC thresholds, timing HMS/SHMS - leading arm, possible rate limitations

* Shifts

* Diagnostics scripts and documentation

* Personnel schedules

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h3. June 28, 2018

*Links to talks->* "Richard":https://redmine.jlab.org/documents/34

*Action Items:*

* Develop and post shift schedule. Send out request. Find out who is KAONLT liaison (Tanja)

* Contact potential run coordinators. (Tanja)

* Aerogel tray exchange for start of experiment and coordination of future exchanges (Vladimir)

* Update runplan and prepare documents needed for shift crew, e.g. run sheets (Garth)

* Set up a web page to collect and link from Redmine - How-To documents, initial calibrations, etc. (Garth, Richard)

* Adapt luminosity scan script to calculate kaon yields by run number for use during experiment by shift crew - has to be simple to use. (Richard)

* Develop trigger/detector checkout plan (Tanja, initial draft)

** Are all experts available at run start, experts needed: coincidence timing , Harp Scans, BCM calibrations, ...

* Find out from JLab what the anticipated settings are for limit switches for both spectrometers and for separation angle in between them. Also find out what magnet cycling procedure should be used for L/T quality separation data (Tanja)

* Find out if all aerogel trays needed for experiment can be stored inside Hall C to avoid having to open truck ramp (Vladimir)

*Analysis Updates:*

* Ryan 

** resolving differences between his analysis and Richard's

* Richard

** Discussed with Mark Jones and is cross checking his January luminosity scan analysis against Mark's. Realized that BCM calibrations (gains, offsets etc) are different - currently working on fixing that, presents current results - low curent point is ~10% below unity, discussion that this seems to indicate that BCM offsets are the issue as low current points would be most sensitive, is planning to also double-check the BCM calibration procedure - had discussion with Dave Mack at JLab

** Presents a script developed for luminosity scans that determines yields for a run number input on command line. Discussion this could be good to adapt for kaon counting during experiment.

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h3. May 31, 2018

*Links to talks->* "Samip":https://redmine.jlab.org/documents/30

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h3. May 17, 2018 

*Links to talks->* "Richard":https://redmine.jlab.org/documents/29, "Ryan":https://hallcweb.jlab.org/DocDB/0009/000968/001/Presentation.pdf, "Samip":https://redmine.jlab.org/documents/30

* Luminosity scans (Richard, Ryan)

** Carbon scan from April seems consistent with no boiling, LH3 and LD2 show deviation from unity, should check effect of EDTM events on efficiencies

** Carbon scans from January (low rates) have large deviations from unity, in particular behavior at higher currents (>40uA), e.g. cpu dead time, that is not yet understood

** discussion about pre-scale factors

* Discussion about Richard's script extracting and printing information from report files and trees including histograms

** Add option for looking at yields with cuts on cointime, target window, and missing mass

** Add option to look at real peak vs. background level

* H(e,e'p) kinematics investigation for fall run (Samip)

** Optimal range is between electron angles of 17-20 degrees, time required ranges from ~1 hour at 17 degrees to ~3 hour at 20 degrees, other angles may be of interest for disentangling charge and current dependent effects

* *Action Items*

** Luminosity scans at low rates from January (Richard)

** Luminosity scans from April with corrected efficiencies, e.d. DT (Ryan)

** H(e,e'p) and H(e,e') kinematics for upcoming Kaon LT run (Samip)

** Kaon LT detailed run plan (Garth, Pete, Tanja)

** Preparations, e.g. report files, diagnostic histograms and real time monitoring, shift worker instructions, optimization of trees (all)

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h3. May 10, 2018

*Links to talks->* "Hem":https://redmine.jlab.org/documents/24, "Richard":https://redmine.jlab.org/documents/23, "Ryan, ":https://redmine.jlab.org/documents/20 "Samip":https://redmine.jlab.org/documents/26

* Luminosity Scans January 2018 (Richard)

** Tracking-based analysis for Runs 1415-1423, .. for now focus on HMS, typical HMS S1X rates are <

** Cuts applied: PID for electrons (Cer, Cal), acceptance (delta)

** Efficiency calculation was investigated in detail and applied using scalers from trees

** Results for carbon (normalized to 30uA) show large variation - need to understand

** *Next steps:*

*** Double check calculation of computer lifetime, look for differences in TRIG and PRETRIG scalers

*** Check stability of pre-scale (Ryan saw changes within runs)

*** Check if detector calibrations for runs are implemented correctly

*** Analyze with Ryan's cuts

* Luminosity Scans April 2018 (Ryan)

** Confirms Richard's earlier finding that scaler-based analysis is not reliable and that it's best to analyze event-by-event

** Tracking-based analysis for runs 2073-2095

** Cuts applied: PID for electrons (TOF, Cal, Chi2), acceptance (delta and angles), BCM4a

** Included most recent detector calibrations in replay of these runs

** Efficiencies from report file mainly, may need to update tracking efficiency implementation

** Found that calculations of computer deadtime requires different set of scalers for runs from January to those from April 2018

** Results show carbon yields consistent with unity within error (0.5% error bars), and boiling for hydrogen and deuterium

** *Next steps:*

*** Check tracking efficiency

* *Global comments on Luminosity Scans (so far)*

** April 2018 scans show hydrogen and deuterium target boiling on level of 3-4%, Carbon is consistent with no boiling, as expected - based on description, new targets are expected to have less boiling than those used previously, e.g. in FPI2. Double check this.

** Efficiencies in report files need to be updated, e.g. CPU deadtime (Richard)

** Check if BCM4a is the one closest to the target - get a map of the hall (Richard, Ryan)

** Uncertainties on current

** Detector calibrations

** HMS vs. SHMS

* eK+ coincidence time from SIDIS Spring 2018 run (Samip)

** Worked with Mark Jones on coincidence time calculation - now available in hcana (see Samip's 10 May 2018 email for more details)

** runs used in this analysis: 3423 with Q2=3.1 GeV2 and W=2.78 GeV

** Coincidence time spectrum shows peak separations >2 ns corresponding to different accelerator frequency

** Missing mass spectra: Kaon peak clearly visible, also see pions even after cuts

** Found that pions appear localized in phase space - seems to be due to end point in kinematic phase space

** *Next steps:*

*** Look for a run with kaon momentum closer to 3 GeV/c (aerogel threshold is ~3 GeV/c for kaons for n=1.015)

* Yield normalized ratios from SIDIS (Hem)

** Yield ratios of data to MC match well in shape, but normalization seems not quite right

** *Next steps:*

*** Check if efficiencies, currents, run time etc. are taken into account correctly

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h3. April 26, 2018

*Links to talks->* "Richard,":https://redmine.jlab.org/documents/18 "Ryan, ":https://redmine.jlab.org/documents/20 "Samip":https://redmine.jlab.org/documents/25

* Discussion luminosity scan analysis (earlier scan) - Richard

** Shown is a scaler-based analysis using scalers from report file and from ROOT tree - the values are different, why that is has to be checked

** Notes on efficiencies in report file:

*** DT (EDTM) is not electronic deadtime. Instead use for now 50ns* trigger rate for HMS and 100ns* trigger rate for SHMS

*** Cherenkov efficiency seems low (check if that is due to PID, thresholds, pi/e, etc)

*** Tracking efficiency needs to be checked

*** 3/4 trigger efficiency seems ok

* Discussion luminosity scan analysis (later scan) - Ryan

** Fewer carbon runs than earlier scan

** Shown is a tracking-based analysis using data from the ROOT trees

** First results for carbon, LH3, and LD2, but efficiencies need to be checked

* SIDIS analysis - Hem

** Shown is a data/MC comparison for different kinematic settings. Agreement in shape is very good. Normalization has yet to be applied.

** Discussion about agreement in z and apparent offset - relation of this offset with spectrometer offset

* Analysis of exclusive events in SIDIS - Samip

** Shown is a look at the first kaon events in exclusive limit of SIDIS data

** Ongoing work on implementing coincidence time into tree

* Discussion of run plan, and in particular possible low Q2/low energy

** Assume that kaon low Q2=0.4 already included - have kinematics with specified beam energies, if needed

** For pion form factor and LT, have two possible settings that can use the prescribed beam energies: Q2=1.45 and 0.35 GeV2 - prioritize towards the higher Q2 as not as sensitive to offsets

** Garth will put this together in a draft email

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h3. March 29, 2018

*Links to talks->* "Richard, ":https://redmine.jlab.org/documents/16 "Samip":https://redmine.jlab.org/documents/27

* Details of adding points to fall run plan - will be ready sooner, likely in week of 4/1 (Garth, Samip, Tanja)

* Luminosity scans (Ryan, Andres, Richard, Pete)

* Macros, SIDIS analysis (Hem, Anashe)

* Elastic data (TBD)

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h3. February 22, 2018

*Links to talks->* "Andres":https://redmine.jlab.org/documents/19

*  Discussion of Andres' slides on elastic W calculation in hcana - initial issue with negative W values seems to be due to outdated information in standard.kinematics file. Additional investigation ongoing.

* Brief description of Samip's work - working on coincidence timing decoding with JLab staff and re-optimization of kinematics

* Discussion of Richard's slides on run plan kinematics and preparations -

** everyone agrees that in general want to have as many L/T cross section separations as possible in a robust run plan balancing statistics vs. systematics

** before actual run may want to do a 3D optimization in all kinematic variables to get the best possible delta(epsilon) for the L/T separations

** for each setting will need 1-2 shifts for calibrations - need to negotiate with other experiments in run group

** kinematics plots W-Q2 show that still need to do some optimization

** run sheets: include raster size, update coincidence count labeling, and carbon target labeling

* Discussion of next meeting. Garth at JLab 8-16 March - might have meeting during that time.

* *Action Items:*

** Post slides/notes from this meeting and procedure to set up hcana in Redmine (Tanja)

** Update run sheet and kinematic optimization for W/Q2 (Garth)

** Circulate elastic calculations for kinematic settings (Samip)

** Continue investigation of elastic data and run plan kinematics (Andres/Richard)

** Test software installation instructions (Pete)

** Draft email to JLab management about need for small angle beam pipe - need to have HMS minimum angle of less than 13 degrees for kaon L/T separations (Tanja) 

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