Changes between Initial Version and Version 1 of AcceptanceTerm

Timestamp:

Mar 20, 2012, 4:16:29 PM (12 years ago)

Author:

trac

Comment:

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AcceptanceTerm

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+=== Definition ===
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+In general, the probability that an event is accepted depends on the characteristics of the measured event, and not on the process that produced it. The measured probability density %$\bar{P}(x,\alpha)$% can be related to the produced probability density %$P(x,\alpha)$%: %\[\bar{P}(x,\alpha)=Acc(x) P(x,\alpha)\]% where %$ Acc(x)$% is the detector acceptance, which depends only on %$ x $%
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+In the computation of the likelihood of the MatrixElement, this acceptance term induce the following term: %\[\int Acc(x) P(x,\alpha)dx\]%
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+This could be estimated easily, by MC, as the number of accepted events on the number of generated events. %\[\frac{N_{accepted}}{N_{generated}}\]%
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+=== How to compute Acceptance term with pythia/PGS. ===
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+WARNING: This module is in devellopment. This module is (not yet) on any official distribution.
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+   1. In order to have the computation of the acceptance term in MW you have to put in the MadWeight_card.dat the following option
+{{{
+Block MW_Run
+     4.         T            # normalizes weight  (1/sigma prefactor)
+     acceptance_run T       # computes the acceptance term}}}
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+-- Main.OlivierMattelaer - 22 May 2009
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