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Dalitz Decays of higher resonances. [message #12713]

Wed, 12 October 2011 18:54

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 623 times)
Attachment: m_inv_pee.png
(Size: 10.16KB, Downloaded 1399 times)
Attachment: m_inv_npip.png
(Size: 11.65KB, Downloaded 1543 times)
Attachment: weight.png
(Size: 10.24KB, Downloaded 1576 times)

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

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[Message index]

		Dalitz Decays of higher resonances. By: Adrian Dybczak on Wed, 12 October 2011 18:54
		Re: Dalitz Decays of higher resonances. By: Ingo Fröhlich on Thu, 13 October 2011 07:52
		Re: Dalitz Decays of higher resonances. By: Adrian Dybczak on Thu, 13 October 2011 16:26
		Re: Dalitz Decays of higher resonances. By: Ingo Fröhlich on Thu, 13 October 2011 17:36
		Re: Dalitz Decays of higher resonances. By: Adrian Dybczak on Thu, 13 October 2011 21:24
		Re: Dalitz Decays of higher resonances. By: Ingo Fröhlich on Thu, 13 October 2011 22:50

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