hi dominique and sebastian,

you have seen the report on the dqa list from our shifter (andreas) on the calo muon z0 distribution. as a matter of fact there is nothing wrong with the calo tagger, but a bug in the monitoring.

line 587f reads
if ( fabs( cbperigee-&gt;parameters()[trk::d0]) &gt; m_maxidz0 ) continue;
if ( fabs( cbperigee-&gt;parameters()[trk::z0]) &gt; m_maxidd0 ) continue;

see effect of tight d0 cut applied to z0 distribution in
https://atlasdqm.cern.ch/webdisplay/tier0/1/express_express/run_179710/run/muoncombined/dqshift/mucalotag/mucbtrk_rec_z0_calotag

cheers,
     wolfgang