[Clas12_first_exp] Fwd:Consideration for the torus polarity flip for the remaining of the run

[Eugene Pasyuk]

This actually relevant for anyone interested in detecting Lambda decays, add Very Strange to the list.

-Eugene


From: Clas12_first_exp <clas12_first_exp-bounces at jlab.org> on behalf of Anselm Vossen <avossen at jlab.org>
Date: Tuesday, April 9, 2019 at 12:35
To: Marco Mirazita <Marco.Mirazita at lnf.infn.it>, Stepan Stepanyan <stepanya at jlab.org>
Cc: clas12 exp <clas12_first_exp at jlab.org>
Subject: Re: [Clas12_first_exp] Fwd:Consideration for the torus polarity flip for the remaining of the run


I second Marco's points about lambda's and di-hadrons.



I am also interested in polarized lambda studies (pending analysis proposal) which also relies on substantial outbending set.



Best,



Anselm

________________________________
From: Clas12_first_exp <clas12_first_exp-bounces at jlab.org> on behalf of Marco Mirazita <Marco.Mirazita at lnf.infn.it>
Sent: Monday, April 8, 2019 12:41:46 PM
To: Stepan Stepanyan
Cc: clas12 first exp
Subject: Re: [Clas12_first_exp] Fwd:Consideration for the torus polarity flip for the remaining of the run

Dear all,
for the E12-06-112A/E12-09-008A experiment (Lambda in SIDIS) the
critical point is the acceptance for low energy pi-, which is low with
inbending field.
I attached a plot of the MM(e Lambda X) simulations for inbending (red)
and outbending (black). The difference will be less striking at high Q2
but it is still there.
For E12-06-112B/E12-09-008B (dihadron production in SIDIS) we will have
two pions with opposite charge in the final state, therefore having both
inbending and outbending data will help in understanding the
systematics.
I understood that the agreement was to have 75% of the data with
inbending and 25% with outbending, is it still so?
Best regards,
Marco




Il 2019-04-07 22:03 Stepan Stepanyan ha scritto:
> Dear all,
>
> For J/psi and also for the high mass (Q’2>5 GeV) TCS, the acceptance
> for the 3-particle final states (-++) in FD for outbending case is ~x2
> smaller compared to the inbending setting (see below). So, I propose
> to continue with intending for remaining 6 days (18 shifts).
>
> Will be good to see similar motivations for inbending vs. outbending
> configurations for other approved RG-A experiments.
>
> We need to see also accumulated charge for these two settings to date
> for RG-A production runs (>10 GeV).
>
> Also, assuming we will need to do low luminosity, random trigger, and
> empty target runs with the new setting, real production run time with
> outbending polarity will be bit more than 5 days. Is there a real
> benefit to have one more setting (energy/polarity) with small amount
> of data?
>
> Regards, Stepan
>
>> Begin forwarded message:
>>
>>> Hi Stepan,
>>>
>>> Here is the photon energy dependence of the acceptance with 5
>> million
>>> generated events.
>>>
>>> -Joseph
>
>
> _______________________________________________
> Clas12_first_exp mailing list
> Clas12_first_exp at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas12_first_exp
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/clas12_first_exp/attachments/20190409/094acfc3/attachment-0001.html>