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:
Topic attachments
I Attachment Action Size Date Who Comment
PIPPIM_INVM_COSTH_PT.gifgif PIPPIM_INVM_COSTH_PT.gif manage 35.6 K 06 Sep 2014 - 14:06 GosiaSudol pi+pi- invaraint mass vs. cos Theta in CM after cut on miss cut
PIPPIM_INV_MASS.gifgif PIPPIM_INV_MASS.gif manage 10.2 K 06 Sep 2014 - 14:07 GosiaSudol pi+pi- invaraint mass
PIPPIM_MISS_MASS2_COSTH_PT.gifgif PIPPIM_MISS_MASS2_COSTH_PT.gif manage 33.3 K 06 Sep 2014 - 14:07 GosiaSudol pi+pi- missing mass2 vs. pi+pi- cosTheta cm using PionTracker
PIPPIM_MISS_MASS2_PT.gifgif PIPPIM_MISS_MASS2_PT.gif manage 11.9 K 06 Sep 2014 - 14:07 GosiaSudol pi+pi- missing mass2 using PionTracker and not using
PIPPIM_MISS_MASS2_PT_INVM.gifgif PIPPIM_MISS_MASS2_PT_INVM.gif manage 22.3 K 06 Sep 2014 - 14:07 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 6.5 K 10 Sep 2014 - 12:24 GosiaSudol pi+pi- missing mass, C + PE at 656 MeV
Topic revision: r4 - 10 Sep 2014, GosiaSudol
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