Kaon_LT Experiment

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h1. *Notes from Meetings*

h2. February 22, 2018

*  Discussion of "Andres's":https://redmine.jlab.org/documents/19 slides on elastic W calculation in hcana - initial issue with negative W values seems to be due to outdated information in standard.kinematics file.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) 

h2. March 29, 2018

* 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":https://redmine.jlab.org/documents/16, Pete)

* Macros, SIDIS analysis (Hem, Anashe)

* Elastic data (TBD)

h2. April 26, 2018

* Discussion luminosity scan analysis (earlier scan) - "Richard":https://redmine.jlab.org/documents/18

** 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, LH2, 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

h2. May 10, 2018

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