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Dalitz Decays of higher resonances. [message #12713] Wed, 12 October 2011 18:54 Go to previous message
Adrian Dybczak is currently offline  Adrian Dybczak
Messages: 8
Registered: January 2007
Location: Cracow Poland
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Dear Ingo

I tried to simulate Dalitz decay of higher resonances. I used macros prepared (mixed) by my self.
One can find it in attachment.
In this topic i propose to focus on one resonance N1520+ which is example.

After several tests i redeclared N1535 resonance in macro without using names from pluto. This was only way to get "proper" result.
Names in macro

Names in PLUTO

So there is no conflict.

What i wanted to check was:
1/. BR value for Dalitz Decay
2/. is dGamma/dM (Zetenyi/Wolf model) working.

Ad 1/. I drawed M_inv_pee from pp->pN1520->ppe+e- reaction


Then i drawed invariant mass of npi+ from pp->pN1520->pnpi+ reaction.


BR_NPi = 0.55 ; Clebsch_Gordan coeff. = 2/3.

so 4.048e-2/(0.55*0.66) = 0.11

now getting 5.36e-6/0.11 = 4.8e-5

What was assumed in macro as 5.0e-5

Ad 2/. dGamma/dM was only check via looking on display hile processing and various value of weight.

By the way below one can find distribution of weight.


It looks slightly different from D1232 weight distribution.

Ingo could you check this macro or provide new one which can be uses to simulate Dalitz Decay for N1520+ without any redelaration?

  • Attachment: reaction.C
    (Size: 5.82KB, Downloaded 426 times)
  • Attachment: m_inv_pee.png
    (Size: 10.16KB, Downloaded 766 times)
  • Attachment: m_inv_npip.png
    (Size: 11.65KB, Downloaded 846 times)
  • Attachment: weight.png
    (Size: 10.24KB, Downloaded 863 times)

[Updated on: Wed, 12 October 2011 20:16]

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