1 / 17

Jixie Zhang 02/27/2012

How well can we determine the cross session central value when reconstruct only to the target plane. Jixie Zhang 02/27/2012. I ntroduction. Reconstructed to the target plane for a 28mm target with target field will not provide event by event accuracy in scattering angle

may
Download Presentation

Jixie Zhang 02/27/2012

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. How well can we determine the cross session central value when reconstruct only to the target plane Jixie Zhang 02/27/2012

  2. Introduction • Reconstructed to the target plane for a 28mm target with target field will not provide event by event accuracy in scattering angle • But the central value of the scattered angle and cross section might not deviate too much from what they should be. This work is trying to find out how large the difference can be.

  3. Details of this work • 28mm target length, • E=2.254 GeV. • Tried only 5.0T target field, beam tilted angle at target center is 0. (Hit the local dump.) • Tried P0=2.251, 1.500 and all (0.5-2.251) • Inelas XS from qfs. Elas Carbon XS from K. C. Stansfield et al. PRC 3, 1448 (1971) • Throw position and angle in flat distribution. Weight event by event with XS during ploting the histogram. • HRS hits were reconstructed only to the target plane. Beam tilted angle has already been taken into account when calculating the scattering angle.

  4. Scattering Angle, P0=2.251 beam tilted angle was taken into account poor theta resolution event by event

  5. XS Central Value, P0=2.251

  6. Scattering Angle, P0=1.500 beam tilted angle was taken into account poor theta resolution event by event

  7. XS Central Value, P0=1.500

  8. Scattering Angle, 0.5<P0<2.251

  9. XS Central Value, 0.5<P0<2.251

  10. XS Systematic Error of Using QFS Model @ P0=2.251 P0=2.251 P0=2.251

  11. Angle Systematic Error @ P0=1.5 P0=1.5 P0=1.5

  12. XS Systematic Error of Using QFS Model @ P0=1.5 P0=1.5 P0=1.5

  13. Conclusion • Although there is no event by event resolution, the centeral value of the inelastic XS still can be determine up to about 1% level • HRS is simulated by snake models.In other workds, there is no bias or offsets issues in the reconstruction. • QFS is not a perfect XS model to use. But replace XS model with a better one will not change this conclusion. The systematic error of various XS model will be about 1%.

  14. Back up

  15. 28mm Target,E=2.254,P0=2.251

  16. 28mm Target,E=2.254,P0=1.500

  17. 28mm Target,E=2.254,0.5<P0<2.251

More Related