[Clas_hadron] Fwd: Re: DNP13 Abstract

[burkert]

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 
<mailto: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
>     <mailto: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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>>
>


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