Lower the values of qop stddevs

[beomki-yeo]

The current stddev of qop is high which can change the sign of qop. This PR lowers the values of qop stddevs.

[krasznaa]

Sure, no objections here. Let me know once it goes out of draft status.

[beomki-yeo]

Yup, but it seems there is a fundamental problem deeper inside - investigating..

[beomki-yeo]

When the qop of initial track parameter gets very small (~0.001) by the high stddev, the sign of qop can change in the kalman updater.

While the exact reason is unknown, I guess that the high deviation from truth value causes kalman fitter to make large numerical uncertainties.

[beomki-yeo]

Actually the stddev of q/p need to be given as something like 10% of truth q/p instead of a hard coded value. (Current examples will still break for >1000 GeV/c particles) But let's do that in the later PR

[beomki-yeo]

@krasznaa review?

[krasznaa]

I trust your judgement on this.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud