Event Scaling with Different Luminosity Values

[sarahwarad]

I analyzed an event with three different luminosity values: 36 fb⁻¹, 300 fb⁻¹, and 3000 fb⁻¹. I obtained the mass distribution with event counts for each case.

I expected the number of events at 300 fb⁻¹ to be equal to the number of events at 36 fb⁻¹, multiplied by √(300/36). Similarly, I expected the number of events at 3000 fb⁻¹ to be equal to the number of events at 36 fb⁻¹, multiplied by √(3000/36).

However, the values I obtained are different from this expectation:

For L = 36 fb⁻¹: (4.140209, 6.506042, 8.280417)
For L = 300 fb⁻¹: (3.751336, 4.140209, 7.097501)
For L = 3000 fb⁻¹: (3.54875, 5.618855, 9.611199)
I also ensured that I ran ./ma5 -R and selected the CMS detector.

Could you help me understand why the event scaling is not following the expected behavior? Any insights would be greatly appreciated!

best regards
Sarah

[jackaraz]

Hi @sarahwarad, the fluctuations might be due to the detector simulation. The detector simulation changes with respect to random initialisation every time you execute an analysis in ma5. However, this difference should get smaller as you increase the number of events in your simulation. From the information you provided, I suspect this is the reason you see such a difference.