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

[Francois-Xavier Girod]

Could we please get a written statement as to where the ratio 75% Inbend /
25% Outbend currently is?

I heard word during the RC meeting yesterday but I think others did not
receive this information

Thanks

Best regards
FX

On Tue, Apr 9, 2019 at 6:35 PM Anselm Vossen <avossen at jlab.org> wrote:

> 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
> >
> >
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