Selection of the elastic events has applied done on the following distributions
  • 175 < delta_phi < 185
  • tanTheta*tanTheta > 1
  • pion and proton identification via cuts on mass
  • ppi- missing mass2 > 1.35

Please note that in comparison to the beam momentum 690MeV/c

we see 60MeV upward shift for the mean value of ppi- invariant mass, as expected from

higher momentum of 800 MeV /c

PPIM_INV_MASS.gif

Total number of elastic events 2.8 MLN. Mean value of CM energy 1.54 GeV, resolution 1.2%


PIM_THETA_MOM.gif

PPIM_MOM.gif

P_THETA_MOM.gif

PPIM_MISS_MASS2_PT.gif

PPIM_miss_mass2_C_PE_800_1.gif

Non-elastic events




Total number of ppi-pi0 events , after background subtraction from the fit to the missing mass spectrum, 440 kEvents


PPIM_MISS_MASS2_nonEla_PT_1.gif

Overlay of ppi- missing mass^2 for non-elastic events from PE (blue line) target and C (red line) one.

Spectra are normalized to yield in the ragio far from the peak position.

PPIM_miss_mass2_notElastic_C_PE_800_1.gif


-- GosiaSudol - 06 Sep 2014
Topic attachments
I Attachment Action Size Date Who Comment
PIM_THETA_MOM.gifgif PIM_THETA_MOM.gif manage 20.4 K 06 Sep 2014 - 13:23 GosiaSudol pi- theta vs. p
PPIM_INV_MASS.gifgif PPIM_INV_MASS.gif manage 8.6 K 06 Sep 2014 - 12:18 GosiaSudol ppi- invariant mass with fit
PPIM_MISS_MASS2_PT.gifgif PPIM_MISS_MASS2_PT.gif manage 10.0 K 06 Sep 2014 - 13:23 GosiaSudol ppi- elastic events missing mass2 using PionTracker
PPIM_MISS_MASS2_nonEla_PT_1.gifgif PPIM_MISS_MASS2_nonEla_PT_1.gif manage 11.0 K 06 Sep 2014 - 21:16 GosiaSudol p pi- non-elastic events missing mass2 using PionTracker
PPIM_MOM.gifgif PPIM_MOM.gif manage 24.0 K 06 Sep 2014 - 13:24 GosiaSudol pi- mom vs. p mom
PPIM_miss_mass2_C_PE_800.gifgif PPIM_miss_mass2_C_PE_800.gif manage 6.4 K 09 Sep 2014 - 17:18 GosiaSudol p pi+ missing mass2, PE and C target at 800 MeV
PPIM_miss_mass2_C_PE_800_1.gifgif PPIM_miss_mass2_C_PE_800_1.gif manage 6.5 K 09 Sep 2014 - 19:34 GosiaSudol p pi- missing mass2, PE and C target at 800 MeV
PPIM_miss_mass2_notElastic_C_PE_800.gifgif PPIM_miss_mass2_notElastic_C_PE_800.gif manage 7.0 K 09 Sep 2014 - 17:19 GosiaSudol p pi- missing mass2 (non-elastic), PE & C, 800 MeV
PPIM_miss_mass2_notElastic_C_PE_800_1.gifgif PPIM_miss_mass2_notElastic_C_PE_800_1.gif manage 6.5 K 09 Sep 2014 - 19:33 GosiaSudol p pi- missing mass2 (non-elastic), PE & C, 800 MeV
P_THETA_MOM.gifgif P_THETA_MOM.gif manage 20.4 K 06 Sep 2014 - 13:24 GosiaSudol p theta vs. p
Topic revision: r5 - 09 Sep 2014, GosiaSudol
 
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