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

be greater than 5 degree.



For the pi+pi invariant mass plot below a cut on the missing mass of pi+pi-

to be within (0.8 - 1.03) is applied



One can see a clear improvement in missing mass resolution when incoming pion momentum is taken from the PionTracker reconstruction (blue line) (red line- only one fixed value of pi- momentum of 748 MeV is used).


From a fit to the missing mass spectrum total number of pi+pi- events,after background subtraction (pol3), amounts to 980 k

Mean of the missing mass peak corresponds to mass of neutron 957 Mev

Overlay of pi+pi- missing mass from PE (blue line) target and C (red line) one.

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


-- GosiaSudol - 05 Sep 2014

Topic attachments
I Attachment Action SizeSorted ascending Date Who Comment
PIPPIM_miss_mass2_C_PE_748.gifgif PIPPIM_miss_mass2_C_PE_748.gif manage 6.4 K 09 Sep 2014 - 14:03 GosiaSudol pi+pi- missing mass, C + PE at 748 MeV
PIPPIM_INV_MASS.gifgif PIPPIM_INV_MASS.gif manage 10.1 K 05 Sep 2014 - 20:45 GosiaSudol pi+pi- invaraint mass
PIPPIM_MISS_MASS2_PT.gifgif PIPPIM_MISS_MASS2_PT.gif manage 11.6 K 05 Sep 2014 - 20:49 GosiaSudol pi+pi- missing mass2 using PionTracker and not using
PIPPIM_MISS_MASS2_PT_INVM.gifgif PIPPIM_MISS_MASS2_PT_INVM.gif manage 23.2 K 05 Sep 2014 - 20:46 GosiaSudol pi+pi- missing mass2 vs. pi+pi- invariant mass using PionTracker
PIPPIM_MISS_MASS2_COSTH_PT.gifgif PIPPIM_MISS_MASS2_COSTH_PT.gif manage 31.4 K 05 Sep 2014 - 22:18 GosiaSudol new
PIPPIM_INVM_COSTH_PT.gifgif PIPPIM_INVM_COSTH_PT.gif manage 34.9 K 06 Sep 2014 - 08:31 GosiaSudol pi+pi- invaraint mass vs. cos Theta in CM after cut on miss cut
Topic revision: r6 - 09 Sep 2014, GosiaSudol
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