[G12] CC time vs SC time question

[Michael C. Kunkel]

Greetings,

Michaela Schever, Masters student at Forschungszentrum Jülich working 
with g12, has asked me a question that puzzles me.

Please look at
https://clasweb.jlab.org/rungroups/g12/wiki/index.php/CC_Study#Tuesday_July_14.2C_2015

Notice the y axis is the cc_time and the x axis is the sc_time.
The question was why is the cc time greater than that of the sc time, 
considering the TOF is located after the CC and also why the negative 
slope?

I did look in the code and noticed that these quantities are grabbed 
from the TBID bank, which has both cc and sc time in ns.
I also looked into some of the calibrations and did not see anything 
striking that would answer this.

Please help us understand this.

BR
MK
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Michael C. Kunkel, PhD
Forschungszentrum Jülich
Nuclear Physics Institute and Juelich Center for Hadron Physics
Experimental Hadron Structure (IKP-1)
www.fz-juelich.de/ikp