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)

EPEM_INV_MASS_ALLCB_1.gif

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

EPEM_INV_MASS_SIG_1.gif

e+e- missing mass for Mee > 0.12

EPEM_MISS_MASS_SIG_1.gif
e+e- invariant mass after cut on e+e- missing mass 0.9 < MMee < 1.03 and for Mee > 0.12

EPEM_INV_MASS_MISSMASSCUT_SIG_PI0ABOVE_1.gif

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)
    PE_vs_C_scaled.gif

  • 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
    PE_vs_C_scaled_all.gif

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)

EPEM_INV_MASS_ALLCB.gif

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

EPEM_INV_MASS_SIG.gif

e+e- missing mass for Mee > 0.12

EPEM_MISS_MASS_SIG.gif

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

EPEM_INV_MASS_MISSMASSCUT_SIG_PI0ABOVE.gif

-- GosiaSudol - 06 Sep 2014
Topic attachments
I Attachment Action Size Date Who Comment
EPEM_INV_MASS_ALLCB.gifgif EPEM_INV_MASS_ALLCB.gif manage 10.6 K 10 Sep 2014 - 19:52 GosiaSudol e+e- invaraint mass with cb
EPEM_INV_MASS_ALLCB_1.gifgif EPEM_INV_MASS_ALLCB_1.gif manage 10.5 K 06 Sep 2014 - 22:33 GosiaSudol e+e- invariant mass all
EPEM_INV_MASS_MISSMASSCUT_SIG_PI0ABOVE.gifgif EPEM_INV_MASS_MISSMASSCUT_SIG_PI0ABOVE.gif manage 9.8 K 10 Sep 2014 - 19:54 GosiaSudol e+e- signal , after missing mass cut
EPEM_INV_MASS_MISSMASSCUT_SIG_PI0ABOVE_1.gifgif EPEM_INV_MASS_MISSMASSCUT_SIG_PI0ABOVE_1.gif manage 10.8 K 06 Sep 2014 - 22:36 GosiaSudol e+e- invariant mass above pi0 with cut on missing e+e- mass
EPEM_INV_MASS_SIG.gifgif EPEM_INV_MASS_SIG.gif manage 9.7 K 10 Sep 2014 - 19:53 GosiaSudol e+e- signal
EPEM_INV_MASS_SIG_1.gifgif EPEM_INV_MASS_SIG_1.gif manage 10.5 K 06 Sep 2014 - 22:35 GosiaSudol e+e- invariant mass
EPEM_MISS_MASS_SIG.gifgif EPEM_MISS_MASS_SIG.gif manage 11.5 K 10 Sep 2014 - 19:54 GosiaSudol e+e- missing mass
EPEM_MISS_MASS_SIG_1.gifgif EPEM_MISS_MASS_SIG_1.gif manage 10.0 K 06 Sep 2014 - 22:34 GosiaSudol e+e- missing mass
PE_vs_C_scaled.gifgif PE_vs_C_scaled.gif manage 6.9 K 21 Sep 2014 - 13:34 PiotrSalabura e+e- missing spectrum with CB subtracted
PE_vs_C_scaled_all.gifgif PE_vs_C_scaled_all.gif manage 7.0 K 21 Sep 2014 - 13:37 PiotrSalabura e+e-missing mas spectrum without CB subtracted
Topic revision: r13 - 21 Sep 2014, PiotrSalabura
 
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