Re: [fluka-discuss]: eta(550) decays

From: Giuseppe Battistoni <>
Date: Wed, 02 Oct 2013 11:25:29 +0200

Hi Joe:
Eta(550) is treated, but its number is not accessible to the user.
At the same way of resonances having a very very short lifetime, eta is treated in production, hadronization etc.
but not in transport: FLUKA makes it decay soon after creation.
In USDRAW you can find only the transported particles (from -6 to 62) listed in the manual at chapter 5.

In practice: the division is somewhat related to what you find in PDG: for common particles (pions, etc.) you find there
"Mean life tau". For fast decaying resonances (Eta 550 included) you find there instead "Full width Gamma"


On 10/2/13 5:48 AM, Joseph Comfort wrote:
> In 2007 I inquired whether Fluka could handle eta (550) particles. The response I got was very favorable, and I thought all was
> well. Now I am not so sure.
> I need the ability to know the location (& region) where am eta is produced along with the decay mode -- at least the 2gamma mode.
> I thought I could get the information from the USDRAW section of mgdraw.f, testing for Icode 102. This procedure works for the very
> similar test for pi0 --> 2gamma decay. I can find lots of pi0's (and some muons and pions, and some other things), but nothing that
> would be an eta.
> The ID code for an eta is a bit obscure. From the bdpart.f routine, it looks like the code should be 29 or 31. (Why 2 essentially
> identical codes? Even pi0 has a duplication: 23 and 26.)
> How can I get this information? Are eta decay modes implemented? Which ones and where? The information is needed to study
> possible backgrounds to a very difficult experiment.
> Thank you.
> Joe Comfort

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Received on Wed Oct 02 2013 - 12:10:38 CEST

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