# 2021-04-23 scattering¶

Scattering analysis update.

Friday 23rd April 14:00 to 17:00. We will use the regular mice zoom details:

**[[computing-software:MICE_zoom_info|MICE Zoom Connection]]** (login required)

Agenda:

- Update on the analysis (John N)
- Latest version of the paper (Paul)

## Notes¶

Present:

John Nugent

Mariyan Bogomilov

John Cobb

Chris Rogers

Paul Soler

John Nugent chasing all of the actions. Made as much progress as possible in context of non-MICE work.

Actions concerning details of the note wording have been done but will not discuss.

Forwards convolution systematic: Model scattering using a Gaussian with RMS sigma (98 ) and a Gaussian having RMS 2 sigma (2 %). Cut tails off empty distribution at 40 mrad. Error of about 1 in the tail bins of the forwards convolution. We are not sensitive to this systematic.

RMS width of beam/etc: John has added a table showing the RMS size of the beam. Noted a typo in 172/DS x’ vs y’. **Action** add a sentence to the paper saying beam width was about 30 mm RMS in x and y and 9 mrad in x’ and y’. (no need to include the full table).

Offset upstream to downstream: Yes the distribution is offset both upstream and downstream with approx same mean. The analysis is self-consistent!

Add empty channel data and MC: The plots have been added to the note.

Add impact parameter plot vs z: Analysis in progress. **Action** Stands.

Plot MC truth momentum distribution: John showed full vs empty true MC distributions.

Discussion of deconvolution/asymmetry: John reminded us of the toy MC deconvolution. Toy deconvolution responds in a symmetric way to a symmetric input distribution. Slight underfilling of tails in the toy MC. Overall looks pretty good.

Residual width: John added to one of the tables a column showing recon-truth momentum residual sigma (it already had RMS recon momentum). **ACTION** John C asked could you please add in the RMS truth distribution.

Momentum correction for different beams: John showed the calculated reconstruction fit curve compared to the momentum lost curve. There was some discussion of how the reconstruction works. **ACTION** Rogers to check the red points using the toy MC.

Deconvolution systematic: John showed a table of errors bin - by - bin.

Table of raw data compared to raw MC with only stats errors: new tables have been put into the note. **ACTION** Chi2 calculation stands

Consider looking at 3D space angle: this has not been maintained. It is not working any more. Chris asks that we drop the action. John Cobb agrees except would be nice to see the raw data. **ACTION** just do the raw data

Correlated chi2: John described his procedure. Still debugging.

Paper Status: Paul mentioned that he will work on the paper once the analysis is finalised.

**Date of Next Meeting: May 28th 14:00 BST**

Updated by Rogers, Chris over 2 years ago · 8 revisions