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Cross section calculation

by Manojg
Tags: calculation, cross
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Apr21-11, 11:00 AM
P: 45
Hi everybody,

I have a experimental question. In cross-section 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 cross-section. How these effect is taken into account?

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Apr21-11, 02:32 PM
P: 685
Generally, what is actually calculated is a differential cross-section. This is then integrated numerically in the allowed phase space region- the cuts come in as boundaries of allowed phase space.
Apr22-11, 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 cross-section, 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 cross-section depends on the cut you are taking to select D particle?

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