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

[Marco Mirazita]

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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