Problem 2481 - "strangeness violation" in kaonZero inelastic process
Summary: "strangeness violation" in kaonZero inelastic process
Status: RESOLVED WONTFIX
Alias: None
Product: Geant4
Classification: Unclassified
Component: processes/hadronic/processes (show other problems)
Version: 10.7
Hardware: All All
: P4 minor
Assignee: dennis.herbert.wright
URL:
Depends on:
Blocks:
 
Reported: 2022-04-06 18:24 CEST by huh9
Modified: 2022-09-16 19:16 CEST (History)
0 users

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An example of "strangeness violation" of kaonZero inelastic. The reference physics is FTFP_BERT (240.35 KB, image/jpeg)
2022-04-06 18:24 CEST, huh9 		Details
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Description huh9 2022-04-06 18:24:48 CEST 
Created attachment 759 [details]
An example of "strangeness violation" of kaonZero inelastic. The reference physics is FTFP_BERT

I am trying to simulate the K0 's propagation in high density material. The momentum of K0 is 326 MeV/c.  The density of the material is 148.9 g/cm^3. The mass fraction of the two main elements is H:He = 0.36:0.63. 

Geant4 version used is g4.10.07.p03. The reference physics lists are tested as following: FTFP_BERT, FTFP_INCLXX, FTF_BIC, QGSP_BERT, QGSP_INCLXX, QGSP_BIC, QBBC. The ratio of the violation is about 8%. 

An example of "strangeness violation" as attached picture.

Looking forward for your reply. Thanks very much!
Comment 1 dennis.herbert.wright 2022-09-16 19:16:00 CEST 
The weak phase is not propagated in Geant4.  As a result, neutral kaon interactions with nuclei must be treated approximately.  This means that strangeness is only conserved on average and that particular events may not conserve it.