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Cross section calculation 
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#1
Apr2111, 11:00 AM

P: 45

Hi everybody,
I have a experimental question. In crosssection calculation of production of particles (say D), one counts the number of produced D. To selection the D one has to apply some kinematic cuts. If cuts are tight, number of D will be less and if cuts are loose, number of D will be large. So, cuts is going to effect the calculated crosssection. How these effect is taken into account? Thanks. 


#2
Apr2111, 02:32 PM

P: 685

Generally, what is actually calculated is a differential crosssection. This is then integrated numerically in the allowed phase space region the cuts come in as boundaries of allowed phase space.



#3
Apr2211, 01:21 PM

P: 45

Ok, thanks for reply.
My question is when you are analyzing the real data. You see a peak of a particle D, you select that particle by taking cuts around its peak, and count the number of events giving that particle. To calculate the crosssection, you divide the number of D particle by flux. Now, the number of D particle depend on the cut around the peak. How do take care of effect due to different cuts? Does not the crosssection depends on the cut you are taking to select D particle? 


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