[Deeppwg] [EXTERNAL] Exclusive pi0 off neutron abstract for upcoming IoP conference

[Valery Kubarovsky]

Dear Daria,
Of course it is very important measurement. I just wanted to stress that the way to the GPD extraction is very long, and I am not sure that in this short presentation you will show how to get GPDs both for u and d quarks from the measurement of asymmetry.
I have nothing agains what you wrote at the end of your mail.
Best regards,
Valery




________________________________
From: Daria Sokhan <daria at jlab.org>
Sent: Thursday, January 28, 2021 04:57
To: Valery Kubarovsky <vpk at jlab.org>
Cc: Marco Contalbrigo <mcontalb at fe.infn.it>; deeppwg at jlab.org <deeppwg at jlab.org>
Subject: Re: [Deeppwg] [EXTERNAL] Exclusive pi0 off neutron abstract for upcoming IoP conference

Dear Valery,

Are you objecting to the statement that this measurement is a contribution towards extracting GPDs, or their flavour separation? Of course it won't achieve it alone, but Paul is not claiming that. It's a step towards it, and will form part of global analyses with other observables and other channels.

Mentioning transversity GPDs, which are the main interest, seemed too much detail for an abstract to what is a general Nuclear and Particle Physics conference (this is the UK equivalent of the DNP in the US, except we only have two groups in the country who work on medium-energy hadron physics).

What about a more general:

"In this talk we present a preliminary extraction of the Beam-Spin Asymmetry of Hard Exclusive π0-Production off neutrons using a deuterium target with CLAS12 - a first-time measurement and exciting step in the study of nucleon structure."

Thanks,
Daria


On Wed, 27 Jan 2021 at 15:30, Valery Kubarovsky <vpk at jlab.org<mailto:vpk at jlab.org>> wrote:
Dear Paul and Daria,
In your abstract your wrote:


  In  this talk we present a preliminary extraction of the Beam-Spin Asymmetry of Hard Exclusive π0-

Production off neutrons using a deuterium target with CLAS12 - a first-time measurement and

exciting step towards the flavour-separation of GPDs.

Could you please write in more details what are these excited steps towards the flavor separation of GPDs?
You are going to publish beam-spin asymmetry. How are you going to extract GPDs from asymmetry?

Pi0 out of neutron cross section was published by Hall-A.

Best regards,
Valery

________________________________
From: Deeppwg <deeppwg-bounces at jlab.org<mailto:deeppwg-bounces at jlab.org>> on behalf of Marco Contalbrigo <mcontalb at fe.infn.it<mailto:mcontalb at fe.infn.it>>
Sent: Wednesday, January 27, 2021 10:14
To: deeppwg at jlab.org<mailto:deeppwg at jlab.org> <deeppwg at jlab.org<mailto:deeppwg at jlab.org>>
Subject: [Deeppwg] [EXTERNAL] Exclusive pi0 off neutron abstract for upcoming IoP conference

Dear all,
attached is an abstract about exclusive pi0 production off neutron
(deuteron) Paul and Daria intend to submit to the IoP conference.

Preliminary results will be proposed for approval by DPWG in the
next coming weeks.

Comments and suggestions are welcome till Friday at noon EST.
I apologize for the late notice.

Best regards, Marco

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