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[CLOSED] Delta from Krivoruchenko [message #12703] Fri, 07 October 2011 10:47 Go to previous message
Ingo Froehlich is currently offline  Ingo Froehlich
Messages: 167
Registered: March 2004
Location: IKF - Frankfurt
first-grade participant
From: *
Dear all,

please update to v5.38.2. In the previous version, the Krivoruchenko model was not enabled by using the following command:

makeDistributionManager()->Exec("dalitz_mod: krivoruchenko");

It is very important to check the output of the reaction, it should print:

[D+_krivoruchenko] dgdm from Krivoruchenko {/}

some more word to the calculation of branching ratios. By default, Pluto does not calculate the branching ratio, but takes as a weight 1/N_ev * BR, where BR is the static branching ratio. This leads of course to incorrect results at the pole, if the branching ratio shows a large mass-dependency.

The only way to let Pluto calculate the branching ratio, is the "Monte-Carlo-Integration method". In this case one has to use a flat dilepton mass generator:

makeDistributionManager()->Exec("dalitz_mod: static_br_thresh=0.100 ; flat_generator");

By using this, the another model is added:

[D+_generator_p_dilepton] Dilepton generator {/generator}

I attached below a macro which uses this method.

Toggle Spoiler

The result is shown below:


and this is the branching ratio which I obtain:


  • Attachment: kriv.png
    (Size: 10.79KB, Downloaded 923 times)
  • Attachment: c1.png
    (Size: 6.24KB, Downloaded 969 times)

Ingo Froehlich
IKF - University of Frankfurt
069-798-47027, FAX: -47024

[Updated on: Wed, 22 May 2013 12:37]

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