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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
occasional visitor
From: *if.uj.edu.pl
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
AddAlias("N1520+","N_star(1520)+");

Names in PLUTO
AddAlias("ND13+","N*(1520)+");

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

index.php?t=getfile&id=6672&private=0

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

index.php?t=getfile&id=6673&private=0

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.

index.php?t=getfile&id=6674&private=0

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 169 times)
  • Attachment: m_inv_pee.png
    (Size: 10.16KB, Downloaded 374 times)
  • Attachment: m_inv_npip.png
    (Size: 11.65KB, Downloaded 395 times)
  • Attachment: weight.png
    (Size: 10.24KB, Downloaded 423 times)

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

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