[G14_run] From Dao Ho: question about electron beam polarization with negative sign

[A.M. Sandorfi]

Hmm...not sure about that.
Franz, can you comment.
Andy


On 12/13/13 12:42 PM, "daoh at andrew.cmu.edu" <daoh at andrew.cmu.edu> wrote:

> Dear all,
> 
> In the
> https://clasweb.jlab.org/rungroups/g14/wiki/index.php/Beam_Polarization_%28Cir
> c.%29
> page, the Beam polarization measurements table (this is an updated one)
> shows negative beam polarization as well as positive one (the ones in
> bold). I discovered that silver 3,4 and gold2 both have negative sign
> (-76.2% and -83.4% respectively), while silver 5a and 5b both have
> positive sign (+88.8%). My question is whether we have taken into account
> of this difference in sign when computing the beam helicity (i.e, during
> cooking or analysis). For my case, I always used positive 88% for the beam
> polarization regardless of whatever run periods.
> 
> Another observation shows that silver 1 and 2 have opposite sign comparing
> to silver 3, but I don't remember me comparing the E asymmetry between the
> two periods with either silver3 or gold2 (Tsuneo might have done that).
> 
> Anyway, I hope this is the sign problem in silver 5 period that we have
> been chasing after.
> Let me know what you think.
> Sincerely,
> Dao Ho
> 
> 
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