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Changes between Initial Version and Version 1 of Ticket #18


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Timestamp:
Sep 2, 2008, 9:46:26 AM (16 years ago)
Author:
Frank Siegert
Comment:

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  • Ticket #18

    • Property Cc w.j.murray@rl.ac.uk frank.krauss@durham.ac.uk added
    • Property Status changed from new to assigned

  • Ticket #18 – Description

    initial v1  
    1 Found by Bill Murray, see email below:
     1Bill Murray looks at cross sections for a run where he tries to split background process pp -> Z[mumu]bb (with Higgs disabled) from signal process pp -> Z[mumu]H[bb]. Doing both in one run yields a factor 3 different cross section from adding the separately integrated cross sections, even though in this case one would expect the process to factorise fairly well (?).
    22
     3We suspect that it has to do with the Higgs width not being recalculated for the chosen Higgs mass (he was using m_H=400 GeV I think). If this can be confirmed, we would have to calculate the particle width using all vertices found in the model. This is closely related to ongoing work on inclusive hard decays, so FS and FK are going to work on it.
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    4 
    5 Potential source:  Need to update widths of Higgs for different masses.
    6 Solution: Calculate widths at the start of the run -> will have repercussions on inclusive decay treatment, major structural work necessary.  Frank & Frank will look into it.
     5Next step: Reproduce problem and verify that it has to do with the width.