[clas12_rgk] [EXTERNAL] Pass1 Data Processing Request for RG-K

Wed Jul 8 10:30:21 EDT 2020

Dear FX,

As I told you last week, RG-B has been approved for pass-1 with swapped
Micromegas cables (75% sure). If it is confirmed, they will have to re-run
reconstruction to correct for that if they want to publish DVCS on proton.
Since same review was performed for rg-A, there is no guarantee that we do
not have such issues. Moreover, at no moment, the RG-A review was
performed assuming DVCS would be published with this pass-1
reconstruction.

I asked to look at MVT residuals to check if there are any swapped cables
for rg-A analysis note (and I contacted rg-b for cross-check) but official
central tracking does not produce this residuals in the current version of
the tracking. (So I am still waiting for confirmation for RG-B)

I do not think corrections of possible swapped cables in micromegas are
unnecessary improvements to central tracking. I am not advocating for the
best central tracking. But having swapped cables is definitely not
acceptable. Recoil proton momentum is not only about kinematics but, as
you said, you need to perform some cuts on variables requiring proton
momentum to ensure exclusivity. And it is really on this last point I am
concerned. You know too well that pi0 contamination can be sizable in bins
where DVCS is weak. So we must be careful to not dilute the asymetry with
poor exclusivity cuts.

Having extensively studied CVT reconstruction, I can assure you that
proton momentum can already be significantly mis-reconstructed under
reasonable beam condition without swapped Micromegas cables. So if we can
make sure we do not have swapped cables, then let's do it. Last but not
least, if a tracking code is not able to tell you that cables has been
swapped, then it tells you that its current accuracy/resolution might not
be great. Would it be enough with no swapped cable, It is an open question
and I haven't seen a solid study demonstrating that. It is true that I
personnally decided to dedicate time to fix central tracking than try to
carefully check if it is good enough.

We may want to see this as an opportunity to perform careful checks of
silly mistakes prior cooking everything.

Kind regards,

Maxime

> Dear all
>
> To clarify the DVCS plans, we do not need any improvement to the central
> tracking for publication and I think this was laid out in our answer to
> the
> committee
>
> In fact for all exclusive reactions, also for exclusive pi0 or exclusive
> phi production, we can calculate the reaction kinematics using the forward
> going particles.
> I showed to the collaboration during the First Experiment meeting that we
> get even better resolutions with this strategy
> We only need the central detector to identify the recoil and perform
> exclusivity cuts, this was shown to the collaboration many times now and
> are not an issue at all
>
> The CCC should know this. The Deep Process Working Group chair is part of
> the CCC.
> At this point I can only wonder why we are getting mixed messages from the
> CCC.
>
> Best regards
> FX
>
>
> On Mon, Jul 6, 2020 at 4:08 PM Daniel Carman <carman at jlab.org> wrote:
>
>> Annalisa,
>>
>> I definitely can be available to discuss this issue with the CCC for
>> RG-K
>> cooking. I want
>> clarity on exactly when RG-K can begin cooking and to make clear to the
>> CCC our plans for
>> initial data analysis. However I do not think that our analysis plans
>> should be strongly coupled
>> to when cooking begins.
>>
>> Regards,
>> Daniel
>>
>>
>> *****************************************************************************
>> *
>> * Dr. Daniel Carman              e-mail: carman at jlab.org
>> <carman at jlab.org>
>> * Staff Scientist                 office: (757)-269-5586
>>
>> * Jefferson Laboratory       web: http://userweb.jlab.org/~carman
>> *
>>
>> *****************************************************************************
>>
>>
>> On Jul 6, 2020, at 9:56 AM, Annalisa D'Angelo <
>> annalisa.dangelo at roma2.infn.it> wrote:
>>
>> Dear All,
>> this is the "unexpected" reply from Kyungseon. I think it would be
>> useful
>> to have a meeting with the CCC on BJ, where at least Dan, FX, Volker and
>> myself should participate.
>> If you agree I will ask for a formal meeting.
>> All the best
>> Annalisa
>>
>>
>> -------- Messaggio Inoltrato --------
>> Oggetto: Re: [EXTERNAL] Pass1 Data Processing Request for RG-K
>> Data: Mon, 6 Jul 2020 13:47:18 +0000
>> Mittente: Joo, Kyungseon <kyungseon.joo at uconn.edu>
>> <kyungseon.joo at uconn.edu>
>> A: annalisa.dangelo at roma2.infn.it <annalisa.dangelo at roma2.infn.it>
>> <annalisa.dangelo at roma2.infn.it>, kjoo at jlab.org <kjoo at jlab.org>
>> <kjoo at jlab.org>
>>
>> Dear Annalisa,
>>
>> I hope that this email finds you well and healthy.  The situation in US
>> is
>> getting even more dire and the worst part is that it seems that people
>> don't care much including the president.
>>
>> Regarding data processing request for RG-K, CCC met last week to discuss
>> it and is concerned about your RG-K's plan for central tracking use.  If
>> central tracking will be used in your physics analysis even at the
>> minimum
>> level which is not clearly defined, we need to make sure that we
>> understand
>> your plan and the review for that part is in place. Please provide us
>> some
>> more details about it. If desirable, we could have a short BJ meeting.
>> Thanks.
>>
>> Best regards, Kyungseon
>>
>>
>>
>> Kyungseon JOO
>> Professor of Physics
>> University of Connecticut
>> Storrs, CT 06269
>> http://www.phys.uconn.edu/~kjoo
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.phys.uconn.edu_-7Ekjoo&d=DwMD-g&c=CJqEzB1piLOyyvZjb8YUQw&r=t2OnxVoP8YJyzuxpHKwj1tmrMj6s1mZ4pgV16sZJZb8&m=7xceQEIQ2uM90Q0ANQaxjLCSGGE8B3wKY1d1YPhUofQ&s=S7APDtRiYNMWdD9qh2N3sB2-5klNNRbwT6WmY18nFPo&e=>
>> ------------------------------
>> *From:* Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it>
>> <annalisa.dangelo at roma2.infn.it>
>> *Sent:* Saturday, July 4, 2020 2:57 AM
>> *To:* Joo, Kyungseon <kyungseon.joo at uconn.edu>
>> <kyungseon.joo at uconn.edu>;
>> kjoo at jlab.org <kjoo at jlab.org> <kjoo at jlab.org>
>> *Subject:* Re: [EXTERNAL] Pass1 Data Processing Request for RG-K
>>
>> *Message sent from a system outside of UConn.*
>>
>> Dear Kyungseon,
>> I was wondering if you had discussed RG-K pass1 scheduling within the
>> CCC.
>> Have a great 4th of July.
>> Annalisa
>>
>>
>> Il 25/06/20 17:31, Joo, Kyungseon ha scritto:
>>
>> Dear Annalisa and Run Group K,
>>
>> Thanks for the request. CCC will discuss this soon and will get back to
>> you.  Thanks.
>>
>> Best regards, Kyungseon
>>
>> Kyungseon JOO
>> Professor of Physics
>> University of Connecticut
>> Storrs, CT 06269
>> http://www.phys.uconn.edu/~kjoo
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__nam10.safelinks.protection.outlook.com_-3Furl-3Dhttp-3A-252F-252Fwww.phys.uconn.edu-252F-7Ekjoo-26data-3D02-257C01-257Ckyungseon.joo-2540uconn.edu-257C34f5c8e0f8e84f778fc208d81fe77cd9-257C17f1a87e2a254eaab9df9d439034b080-257C0-257C0-257C637294426543856759-26sdata-3DYOgUZxrMo7XXh0jAMEHVoRKn2uL-252FG2-252BUs9juEVlOkeA-253D-26reserved-3D0&d=DwMD-g&c=CJqEzB1piLOyyvZjb8YUQw&r=t2OnxVoP8YJyzuxpHKwj1tmrMj6s1mZ4pgV16sZJZb8&m=7xceQEIQ2uM90Q0ANQaxjLCSGGE8B3wKY1d1YPhUofQ&s=VOAnwqhDklztRESzb-6t8zx789C5hl4RpfD_pe3rxF8&e=>
>> ------------------------------
>> *From:* Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it>
>> <annalisa.dangelo at roma2.infn.it>
>> *Sent:* Wednesday, June 24, 2020 4:00 PM
>> *To:* kjoo at jlab.org <kjoo at jlab.org> <kjoo at jlab.org>; Raffaella De Vita
>> <Raffaella.Devita at ge.infn.it> <Raffaella.Devita at ge.infn.it>;
>> mcontalb at fe.infn.it <mcontalb at fe.infn.it> <mcontalb at fe.infn.it>;
>> Battaglieri Marco <Marco.Battaglieri at ge.infn.it>
>> <Marco.Battaglieri at ge.infn.it>;bryan.mckinnon at glasgow.ac.uk
>> <bryan.mckinnon at glasgow.ac.uk> <bryan.mckinnon at glasgow.ac.uk>;
>> elfassi at jlab.org <elfassi at jlab.org> <elfassi at jlab.org>
>> *Cc:* latifa at jlab.org <latifa at jlab.org> <latifa at jlab.org>;
>> burkert at jlab.org <burkert at jlab.org> <burkert at jlab.org>; Francois-Xavier
>> Girod-Gard <fxgirod at jlab.org> <fxgirod at jlab.org>; Viktor Mokeev
>> <mokeev at jlab.org> <mokeev at jlab.org>; maxime.defurne at cea.fr
>> <maxime.defurne at cea.fr> <maxime.defurne at cea.fr>; Ralf Gothe
>> <rwgothe at gmail.com> <rwgothe at gmail.com>; Dan Carman <carman at jlab.org>
>> <carman at jlab.org>; clas12_rgk at jlab.org <clas12_rgk at jlab.org>
>> <clas12_rgk at jlab.org>
>> *Subject:* [EXTERNAL] Pass1 Data Processing Request for RG-K
>>
>> *Message sent from a system outside of UConn.*
>>
>>
>> Dear CLAS Collaborator Chair,
>>
>> Dear Members of the CLAS Coordinating Committee,
>>
>> please find in attachment the formal request letter for pass1 data
>> processing of the RG-K data set in parallel with RG-B.
>>
>> We are available for any additional information you may need.
>>
>> Best regards
>>
>> Annalisa D'Angelo
>>
>> for the Run Group K
>>
>>
>> --
>>
>> ================================================
>> Prof. Annalisa D'Angelo
>> Dip. Fisica, Universita' di Roma "Tor Vergata"
>> Istituto Nazionale di Fisica Nucleare
>> Sezione di Roma Tor Vergata, Rome Italy
>> email:annalisa.dangelo at roma2.infn.it
>> Jefferson Laboratory, Newport News, VA USA
>> Email: annalisa at jlab.org
>> Tel: + 39 06 72594562
>>
>> --
>> ================================================
>> Prof. Annalisa D'Angelo
>> Dip. Fisica, Universita' di Roma "Tor Vergata"
>> Istituto Nazionale di Fisica Nucleare
>> Sezione di Roma Tor Vergata, Rome
>> Italyemail:annalisa.dangelo at roma2.infn.it
>> Jefferson Laboratory, Newport News, VA USA
>> Email: annalisa at jlab.org
>> Tel: + 39 06 72594562
>>
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