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

be greater than 5 degree.


PIPPIM_MISS_MASS2_COSTH_PT.gif

PIPPIM_MISS_MASS2_PT_INVM.gif


PIPPIM_INV_MASS.gif

PIPPIM_INVM_COSTH_PT.gif

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).

PIPPIM_MISS_MASS2_PT.gif

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..)

PIPPIM_miss_mass2_C_PE_656.gif



-- GosiaSudol - 06 Sep 2014

  • pi+pi- missing mass, C + PE at 656 MeV:
Topic revision: r4 - 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)