[Clas_hadron] Fwd: Re: DNP13 Abstract

[Viktor Mokeev]

 Hi All,

 Despite  NN-Bar--->2gamma is rare, it should have distinctive signature, which is two correlated photons in opposite directions.

 Best Regards,
                    Victor 

----- Original Message -----
From: "burkert" <burkert at jlab.org>
To: "Will Phelps" <wphelps at jlab.org>
Cc: "CLAS Hadron Spectroscopy" <clas_hadron at jlab.org>
Sent: Monday, July 1, 2013 5:21:10 PM
Subject: [Clas_hadron] Fwd: Re:  DNP13 Abstract


Valeri is, of course, correct (see comment below). The 2-gamma annihilation is a rare process. The annihilation to mesons is dominant. Still, one should see clustered e.m. energy as there should be a number (many?) of pi0's generated, and if the entire energy (e.m. + hadr.) is contained in the EC the response should still be about 1.9 GeV, but more distributed in space. 
Volker 





-------- Original Message -------- 
Subject: 	Re: [Clas_hadron] DNP13 Abstract 
Date: 	Mon, 1 Jul 2013 17:02:08 -0400 
From: 	Valery Kubarovsky <vpk at jlab.org> 
To: 	burkert <burkert at jlab.org> 





Hi Volker, 

The neutron-antineutron annihilation at rest results in the production of mesons, primarily pions. It is not electromagnetic process like in electron-positron annihilation. The annihilation to photons is very rare process. 

Regards, 
Valery 




On Mon, Jul 1, 2013 at 4:34 PM, burkert < burkert at jlab.org > wrote: 




Will, 
Beautiful! 
I wonder if anyone had a look at the energy information for antineutrons hitting the EC. They will have to lose the anti-matter energy by annihilating at rest with a neutron into a pair of 940 MeV photons and leaving in the calorimeter an e.m. energy cluster of 1.88 GeV. It would be a direct measurement of the neutron-antineutron annihilation. 
Volker 







On 7/1/13 4:15 PM, Will Phelps wrote: 




Hello Volker, 
It is a peak in the missing mass spectrum. Here is a histogram with ~60% of g12's data. 
-Will 



On Jul 1, 2013, at 4:05 PM, burkert < burkert at jlab.org > wrote: 




Hi Will, 
An interesting abstract. I am curious regarding your anti-neutron. Is it just a single event at the right mass or do you see a peak in the missing-mass spectrum? 
Volker 

On 7/1/13 3:07 PM, Will Phelps wrote: 


Hello everyone,
My apologies for this being so late, I just really wanted to try to get this in before the deadline tonight. 
Thanks,
-Will Phelps 

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