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 23 MeV downward shift for the mean value of ppi- invariant mass, as expected from

lower momentum of 656 MeV


Total number of events 2 MLN. Energy in CMS 1.45 GeV




Non-elastic events


Overlay of ppi- missing mass^2 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_C_PE_notElastic_656.gif

Total number of ppi-pi0 events from fit to the missing mass spectrum (after background subtraction) 137 kEvents

Pi0 peak at 0.0255 GeV /c^2 (expected at 0.0193)

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.


-- GosiaSudol - 10 Sep 2014

Topic attachments
I Attachment Action Size Date Who Comment
PIM_THETA_MOM.gifgif PIM_THETA_MOM.gif manage 22.0 K 06 Sep 2014 - 14:01 GosiaSudol pi- theta vs. p
PPIM_INV_MASS.gifgif PPIM_INV_MASS.gif manage 9.3 K 06 Sep 2014 - 14:03 GosiaSudol ppi- invariant mass with fit
PPIM_MISS_MASS2_nonEla.gifgif PPIM_MISS_MASS2_nonEla.gif manage 10.7 K 06 Sep 2014 - 16:53 PiotrSalabura missing mass2 ppi-
PPIM_MISS_MASS2_nonEla_PT.gifgif PPIM_MISS_MASS2_nonEla_PT.gif manage 10.9 K 06 Sep 2014 - 16:50 PiotrSalabura same missing mass spectrum but with momentum from pion tracker reconstruction
PPIM_MOM.gifgif PPIM_MOM.gif manage 25.0 K 06 Sep 2014 - 14:01 GosiaSudol pi- mom vs. p mom
PPIM_miss_mass2_C_PE_656.gifgif PPIM_miss_mass2_C_PE_656.gif manage 6.8 K 10 Sep 2014 - 12:21 GosiaSudol p pi- missing mass2, PE and C target at 656 MeV
PPIM_miss_mass2_C_PE_notElastic_656.gifgif PPIM_miss_mass2_C_PE_notElastic_656.gif manage 7.1 K 10 Sep 2014 - 12:22 GosiaSudol p pi- missing mass2 (non-elastic), PE & C, 656 MeV
P_THETA_MOM.gifgif P_THETA_MOM.gif manage 21.2 K 06 Sep 2014 - 14:00 GosiaSudol p theta vs. p
Topic revision: r6 - 10 Sep 2014, GosiaSudol
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