You are here: Foswiki>PionBeam Web>MomentumScan>PPIM_656 (2014-09-10, GosiaSudol)Edit Attach
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

PPIM_INV_MASS.gif

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


P_THETA_MOM.gif


PIM_THETA_MOM.gif


PPIM_MOM.gif


Non-elastic events



PPIM_MISS_MASS2_nonEla.gif

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.



PPIM_miss_mass2_C_PE_656.gif

-- GosiaSudol - 10 Sep 2014


Attachments 8
Edit  | Attach | Print version | History: r6 < r5 < r4 < r3 | Backlinks | View wiki text | Edit wiki text | More topic actions
Topic revision: r6 - 2014-09-10, GosiaSudol
Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki Send feedback | Imprint | Privacy Policy (in German)