Changes between Version 1 and Version 2 of FAQ-General-10


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Timestamp:
04/06/12 16:33:02 (7 years ago)
Author:
trac
Comment:

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  • FAQ-General-10

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    3 ==== I generated an s-channel process p p > W+ > e+ ve, and in some events the W doesn't show up in the event record. Why is this? ====
     3==== I generated an s-channel process p p > W+ > e+ ve, and in some events the W doesn't show up in the event record. Why is this? ====
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    55This is perfectly normal. Since you haven't used the decay chain syntax for the W,
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    7 p p > (W+ > e+ ve) (in MG4) or
     7p p > (W+ > e+ ve) (in MG4) or
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    9 p p > W+, W+ > e+ ve (in MG5)
     9p p > W+, W+ > e+ ve (in MG5)
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    1111the W is not forced to be onshell - so when the invariant mass of e+ ve goes beyond the specified 15 widths (given by bwcutoff in the run_card) it is not included in the event file.
     
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    1515-- Main.JohanAlwall - 2011-01-29
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