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Blast Analysis Meeting Summary: Improvements, Kinematic Variables, Calibration Discrepancies

This document provides a summary of the Blast Analysis Meeting discussing improvements in figures of merit, kinematic variables, detector asymmetry, Q2 calibration issues, and spin angle measurements. It covers the need for corrections, data analysis techniques, and future considerations.

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Blast Analysis Meeting Summary: Improvements, Kinematic Variables, Calibration Discrepancies

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  1. Status of theH(e,ep) Analysis Chris Crawford Blast Analysis Mtg Dec 15, 2004

  2. Dataset • 20 kC Dec 2003 pz=0.48 • 57 kC Apr 2004 pz=0.42 • 305 kC Dec 2004 pz=0.75 factor of 2.9 improvement in figure of merit Blast Analysis Meeting

  3. Kinematic Variable • over-determined Blast Analysis Meeting

  4. Kinematic Variable • over-determined Blast Analysis Meeting

  5. Kinematic Variable • over-determined Blast Analysis Meeting

  6. Detector Asymmetry • need to correct for Q2L¹ Q2R • AL,R have strong Q2 dependence • systematic error of Q2 calibration discrepancy between L/R most important Blast Analysis Meeting

  7. Q2 Calibration • kinematic fit elastic events c2 from WC (18 wires) + TOF timing incoporates mp as additional constraint • correct track parametersby comparison with kinematic fit • fit relative orientation of WC’susing parallax with cosmics • fit shift and rotation of WCby minimizing c2 above • BLAST field? Blast Analysis Meeting

  8. Spin Angle dR/db¼ 0.0073/mp¢± • spin-angle measurement • global fit: b = 43.3±§ 2.5± • insensitive (both AL, AR same sign) • T20 fit: b = 46.5± - 2.5± + 3.5± • need more data at same angle • holding field map b¼ 45± • map field in complete volume (w/gradients) fit to either TOSCA or Harmonics • superposition of separate fields Blast Analysis Meeting

  9. False Asymmetries • Beam • Target Blast Analysis Meeting

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