***************************************************************************** Fpi Data Analysis D. J. Mack last updated August 8,1999 ***************************************************************************** ********* ANALYSIS ********* D-/D+: use simc to get cross sections for D- and D+ separately generate separated ratios D+/H+: highest priority: good target density information for H and D H+: resolve remaining problems in low epsilon cross sections at high -t. g_piNN: ongoing L-T separations at Q2=0.6, 0.75 ************** MISC. ANALYSIS *************** "hodoscope" tracking effi versus run number, etc. reduction in target density due to beam heating pion absorption MACK Summarize correction needed to account for 1H2 and 1H-2H contamination in our Deuterium target plot normalized SOS e- rate versus time as a ? luminosity check summarize harp scans on beam width generate SOS singles ntuples for normalization checks List of hardware changes during the experiment ******* Optics ******* redo heepcheck with known beam spot angle variations, SHIN and attach a decent fitting program revisit the SOS using the replay_3 elastic SHIN angle scan ********************** Detector Calibrations ********************** what WC tracking switches do we have enabled? IKSHIN,MACK done tune the S1.S2 fiducial region for best match VANSYOC with the WC active area and good statistics figure out how to handle the WC2 Y' plane ringing at the beginning of the experiment carefully study the interaction between the sos shower counter and gas cerenkov cuts. what are the efficiencies? inefficiencies? what are our optimal cuts? ******************* Analyzer Upgrades ****************** fix HMS coincidence tracking efficiency Make contour plots of pe# versus x,y for the gas cerenkov detectors *************************** REPLAY_4 UPGRADES: **************************** MISCELLANEOUS: epics data report? (at least for target quantities) READY (Volmer) lower "beam on" threshold from 5 microA to 1 microA READY (Volmer) DETECTOR CALIBRATIONS: new WC time to distance maps READY (Shin/Volmer) optimized WC tracking code parameters WC ringing problem workaround rerun with approved hodo slop parameters READY (Volmer) use larger value than 7.5 cm for cal slop READY (Volmer) OPTICS: updated heepcheck (eg, scattering angle takes into account beam spot position) Put Heep offsets into proper spectrometer, not optics. fudge hms and sos p0 rather than deltas extend sos saturation correction to lower momenta READY? (Volmer) remove ssxptar vs ssytar correlation remove hsxptar vs hsytar correlation remove hsdelta vs hsxptar correlation (hms saturation correction) remove hsdelta vs hsyptar correlation ****************** SYSTEMATIC SURVEYS ****************** (mostly related to better understanding of beam energy, angle offsets, etc.) Some earlier "completed" surveys must be repeated with replay_3 since the HMS and SOS optics as well as the electron dE/dx have changed. review Outfile.txt files for error messages Detector Studies: Sieve Studies: SOS sieve reproducibility survey SOS sieve run Xfp vs Yfp survey HMS sieve reproducibility survey HMS sieve run Xfp vs Yfp survey COMPLETED SURVEYS: survey of t-to-d maps SHIN (COMPLETE) WC efficiency systematics replay_3 VANSYOC (COMPLETE) WC efficiency systematics replay_2 SHIN (COMPLETE) ytgt survey for all runs SHIN (COMPLETE) MM in 1,2H(e,e'pi) for replay_2 SHIN (COMPLETE) MM in 1,2H(e,e'pi) for replay_3 VOLMER (COMPLETE) Yields for D(e,e'pi+-) for replay_3 VARDAN(COMPLETE) Yields for H(e,e'pi+) for replay_3 SHIN/VANSYOC(COMPLETE) HEEPCHECK studies with e+p elastics BLOK, VOLMER (COMPLETE) survey of cctime LIANG (COMPLETE) ************ SIMULATIONS ************ prove that thrown phase saturates the simc yields within our cuts put slop parameters into SimC? GEANT simulation of detector stack The simc to do list follows: 1. Install pion form factor in the hadron radiation part of simc. 2. Check our DIS data versus simc. (While the elastic cross section is well known, the perfect correlation between delta and scattering angle makes a test of the acceptance with elastics unconvincing.) 3. deraster sos momentum Data versus MC to be understood: 1. At high epsilon settings, the data MM shifts 1 MeV between Phi_L and Phi_R. Presumably the sos dispersion has changed in saturation. It could be due to fudging delta rather than p0. 2. At low epsilon settings, MM Data are wider than MC, especially Phi_R. 3. MC MM okay at low epsilon. High by 1 MeV at high epsilon. MC eloss problem? 4. MC vs data offsets: MM, ssytar, etc. ********************************************************************************* ARCHIVE: ARCHIVE: ARCHIVE: ARCHIVE: ARCHIVE:ARCHIVE: ARCHIVE: ARCHIVE: ********************************************************************************* ******************* REPLAY_3 UPGRADES: ******************* ANALYSIS CODE: fix the calculation of gas cerenkov efficiency READY fix the calculation of the calorimeter efficiency READY Vansyoc PID requirement on fiducial tracking. READY McKee output average "beam on" average current and charge. READY McKee output "beam on" seconds. READY Fix error in the calculation of excitation energy. READY Add MMx and EEx to c_physics and the ntuples. READY Fix unnormalized shower energy variables for singles ntuples. READY Volmer modification to electron dE/dX READY Include untracked beta and Etot in the ntuples. READY OPTICS: Volmer final HMS100 matrix elements and heepcheck offsets. READY Volmer SOS v2.0 with saturation corrections and heepcheck offsets. READY CALIBRATIONS: Anklin updated charge calibrations. READY Volmer WC timing window adjustments for best efficiency. READY Volmer change of Nmax hits to 25 in both arms. READY Vardan SOS shower counter calibration runs near 17150. READY Vansyoc SOS shower counter calibrations after Thanksgiving. READY Vansyoc: calorimeter slop parameters still 3cm (should be 7.5cm). READY Liang fine adjustment of cctime. READY note: In replay_3, cctime cuts should be centered on 0.0 ******************* REPLAY_2 UPGRADES ******************* Replay_2 gave us better beam energies, better HMS and SOS matrix elements, greatly improved HMS and SOS TOF, better dE/dx corrections, sta- bilized cctime, better time-to-distance maps, better slop adjustments, implemented 4/6 tracking, and got rid of randoms to make the ntuples smaller. GENERAL: Kinematics file with better beam energies. READY OPTICS: Ketevi final SOS matrix elements. READY Volmer improved HMS100 matrix elements. READY Volmer updated and certified FR correction parameters. "READY" (IE, HMS1) ANALYSIS CODE: Blok/Volmer changes to kinematics calculations and nested if statements. READY Vandermeer-Volmer fix to unnormalized shower energy variables. READY Vansyoc removal of calorimeter fiducial cut in the analyzer. READY Vansyoc-Volmer implementation of calorimeter fiducial cuts in cuts file. READY Volmer rejection of needless randoms. READY CALIBRATIONS: McKee improved TOF parameters. READY. McKee modified TOF code to handle transient pmt. READY Mueller photoelectron number calibrations for gas Cerenkovs. READY (SOS) Vansyoc certified dE/dx corrections. READY Vansyoc shower counter offset and slop adjustments READY Vardan's correction for the calorimeter attenuation. READY Volmer implementation of Meekins-Vanwestrum 4/6 tracking. READY Volmer stabilized HMS cctime. READY Volmer updated WC time-to-distance maps. READY Volmer/Mack new hodo slop parameters and delta histos. READY MISCELLANEOUS: Write out raw charge scalers for Anklin. COMPLETE ******************* REPLAY_1 UPGRADES ******************* all runs with a single set of parameters corrected most of the kinematics file errors found in the online