All plots are done using pi+, pi- PID cut and opening angle between pi+pi- to

be greater than 5 degree.





One can see a clear improvement in missing mass resolution when incoming pion momentum is taken from the reconstruction (blue line)(red line- only one fixed value of pi- momentum of 656 MeV is used).


From a fit to the missing mass spectrum Total number of pi+pi- events (after background -pol3-subtraction) amounts to 460 k

Mean value of the missing peak is 0.907, corresponding to the neutron mass of 952 MeV (16 MeV to high..)


-- GosiaSudol - 06 Sep 2014

  • pi+pi- missing mass, C + PE at 656 MeV:
I Attachment Action Size Date Who Comment
PIPPIM_INVM_COSTH_PT.gifgif PIPPIM_INVM_COSTH_PT.gif manage 35 K 2014-09-06 - 16:06 GosiaSudol pi+pi- invaraint mass vs. cos Theta in CM after cut on miss cut
PIPPIM_INV_MASS.gifgif PIPPIM_INV_MASS.gif manage 10 K 2014-09-06 - 16:07 GosiaSudol pi+pi- invaraint mass
PIPPIM_MISS_MASS2_COSTH_PT.gifgif PIPPIM_MISS_MASS2_COSTH_PT.gif manage 33 K 2014-09-06 - 16:07 GosiaSudol pi+pi- missing mass2 vs. pi+pi- cosTheta cm using PionTracker
PIPPIM_MISS_MASS2_PT.gifgif PIPPIM_MISS_MASS2_PT.gif manage 11 K 2014-09-06 - 16:07 GosiaSudol pi+pi- missing mass2 using PionTracker and not using
PIPPIM_MISS_MASS2_PT_INVM.gifgif PIPPIM_MISS_MASS2_PT_INVM.gif manage 22 K 2014-09-06 - 16:07 GosiaSudol pi+pi- missing mass2 vs. pi+pi- invariant mass using PionTracker
PIPPIM_miss_mass2_C_PE_656.gifgif PIPPIM_miss_mass2_C_PE_656.gif manage 6 K 2014-09-10 - 14:24 GosiaSudol pi+pi- missing mass, C + PE at 656 MeV
Topic revision: r4 - 2014-09-10, GosiaSudol
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