Summary of the raw yields for pi-PE runs :

table and plots include statistics from the following days:

0.69 GeV /c

195 - 198 : JULY 2014 beam

232 - 245 : AUG 2014

Total : 774 MLN

246 - 249 : Momentum Scan (170 MLN)

Day	Nb. evt	Time	Mee (sig)	Mee(sig above pi0)	Mee(sig above pi0, miss cut)*
SUM	944 M	182 h	448410	926	598

* with cut on the e+e- missing mass (0.9 - 1.03) GeV /c2 and depending on the spectrum

e+e- invariant mass spectra (black N+-, red CB)

e+e- signal (N+- - CB)

e+e- missing mass for Mee > 0.12

e+e- invariant mass after cut on e+e- missing mass 0.9 < MMee < 1.03 and for Mee > 0.12

Plots shown below shows overlay of e+e- spectra taken with PE target and ONE momentum of 0.69 GeV /c (770 MLN) with Carbon data collected at 0.612,0.69,0.748,0.8 GeV /c -246 MLN (0.656 GeV /c not included because data were not yet processed). Carbon data were scaled to SAME number of events (by factor 3).

• e+e- missing spectrum with CB subtracted: (0.42 is ratio of C background under neutron peak visible in PE data)
  

• e+e-missing mas spectrum without CB subtracted: Note that shape of spectra for M> 1 GeV/c is different for both targets which indicates different contributions of physics channels or/and conversion background
  

CARBON TARGET

Summary of the raw yields for pi-C runs :

table and plots include statistics from the following days:

Day	Nb. evt	Time	Mee (sig)	Mee(sig above pi0)	Mee(sig above pi0, miss cut)*
SUM	222 M	51 h	81224	184	84

* with cut on the e+e- missing mass (0.9 - 1.03) GeV /c2 and depending on the spectrum

e+e- invariant mass spectra (black N+-, red CB)

e+e- signal (N+- - CB)

e+e- missing mass for Mee > 0.12

e+e- invariant mass after cut on e+e- missing mass 0.9 < MMee < 1.03 and for Mee > 0.12

-- GosiaSudol - 06 Sep 2014