You are here: Foswiki>PionBeam Web>MomentumScan>PIPPIM_800 (2014-09-09, GosiaSudol)Edit Attach

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

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



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 PionTracker reconstruction (blue line) (red line- only one fixed value of pi- momentum of 800 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 620 k

Mean value of the missing peak is 0.914, corresponding to the neutron mass of 957 MeV (18 MeV to high..)

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.


PIPPIM_miss_mass2_C_PE_800.gif
-- GosiaSudol - 06 Sep 2014
I Attachment Action Size Date Who Comment
PIPPIM_INVM_COSTH_PT.gifgif PIPPIM_INVM_COSTH_PT.gif manage 38 K 2014-09-06 - 15:37 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 - 15:37 GosiaSudol pi+pi- invaraint mass
PIPPIM_MISS_MASS2_COSTH_PT.gifgif PIPPIM_MISS_MASS2_COSTH_PT.gif manage 35 K 2014-09-06 - 15:37 GosiaSudol pi+pi- missing mass2 vs. pi+pi- cosTheta cm using PionTracker
PIPPIM_MISS_MASS2_PT.gifgif PIPPIM_MISS_MASS2_PT.gif manage 12 K 2014-09-06 - 15:38 GosiaSudol pi+pi- missing mass2 using PionTracker and not using
PIPPIM_MISS_MASS2_PT_INVM.gifgif PIPPIM_MISS_MASS2_PT_INVM.gif manage 26 K 2014-09-06 - 15:38 GosiaSudol pi+pi- missing mass2 vs. pi+pi- invariant mass using PionTracker
PIPPIM_miss_mass2_C_PE_800.gifgif PIPPIM_miss_mass2_C_PE_800.gif manage 6 K 2014-09-09 - 19:17 GosiaSudol pi+pi- missing mass, C + PE at 800 MeV
Edit  | Attach | Print version | History: r3 < r2 < r1 | Backlinks | View wiki text | Edit wiki text | More topic actions
Topic revision: r3 - 2014-09-09, 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)