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### Validation of Bertini and CHIPS

Outline

- Models tested
- Compared to dataset
- Outlook

Sunanda Banerjee

November 30, 2009

Models Tested

- Seven versions of Bertini cascade code are tried
- As in 9.3.beta01
- Two tags from Dennis (V09-02-05 and V09-02-08)
- As in 9.2.ref09 with additional changes (formation time)
- As in 9.2.ref10 with trailing effect incorporated for Bertini code
- Tag V09-02-10 which is supposed to be in the release
- As in 9.3.cand02
- Two versions of CHIPS code
- As in 9.2.ref10 + extra tag from Mikhail (V09-02-21)
- As in 9.3.cand02

Data Used

Look at several kinematic distributions from 5.0 GeV/c π+, π--induced interactions and 7.5/14.6 GeV/c p-induced interactions on a variety of nuclear targets

For calculation of invariant cross sections in ITEP data, constant bin width of ±4° is used and in BNL data constant bin width of (Δy = ±0.1) is used.

Also used CMS test beam data from 2006 H2 beam line data for mean response, resolution, MIP fraction

In addition look at the energy evolution of mean multiplicity and total KE fraction of different particles for the physics lists QGSP_BERT and CHIPS

Mean Multiplicity

- Energy dependence is smoother in CHIPS for all particles

Mean Total KE Fraction

- Energy dependence of total KE fraction is also smoother for CHIPS

Mean Response (ECAL+HCAL)

Mean energy response best for _EMV(EML) and better in the new version.

Observations

- There is no significant changes in the prediction of Bertini cascade model for inclusive p/n cross sections in π±-induced interactions in V09-02-10 or Cand02 from the reference tags V09-02-05 or V09-02-08.
- Predictions forCHIPSis not as good for inclusive n/p cross sections in the intermediate energies.
- Predictions of Bertini cascade model with changes due to formation time has some interesting and significant changes.
- Energy dependence is smoother for CHIPS than QGSP_BERT physics list.
- Agreement for mean energy response and for MIP fraction in π‾for CMS test beam data is better in the two recent versions of Bertini.

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