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Comparison of the p + p - g signal selection with past results. C. Di Donato, M. Jacewicz. Signal/Background. X-section  [  b]: 2.04  10 -3 9.87  10 -3 0.30  10 -3 0. 46 0.14  10 -3. Reaction:             0  e  e        0

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signal background
Signal/Background

X-section  [b]:

2.04  10-3

9.87  10-3

0.30  10-3

0. 46

0.14  10-3

Reaction:

 

 0

 ee

0

ee0

  • Most frequent charged  decays:
  • BR() = (22.73±0.28)  10-2
  • BR(0) = (4.60±0.16)  10-2
  • BR(ee) = (6.8±0. 8)  10-3
new vs old
New VS Old

RAD Stream

2 pnc

1 charged vertex rxy<4cm & |z|<8cm

2 tracks balanced charge

Kinematic fit: quadrimomentum conservation with 2 clusters compatible with photon hypothesys

Cut on M(recoil) to reject +-0

RAD + RPI + KPM

At least 2pnc one of them with Eg>250MeV

Two tracks with balanced charge and closest to IP using info at pca

2 neutral cluster in time, with most energetic assumed to originate from 

Eg(recoil) calculated from 2 body kinematics 

Using eta decay kinematic we correct Eg(h)

Cut on Eg(h) to reject background

analysis versus evcl
Analysis versus EVCL
  • Stream correlation for MC charged RAD investigated: run RAD, RPI & RAD, KPM & RAD & RPI

ALL

RAD

RPI

KPM

using new approach
Using new approach

MC 2005: All Phys, runs 34410-34499 (12.7pb-1) Only RAD stream

track selection vs vertex selection
Track Selection VS Vertex Selection
  • Best Results from track selection using PCA at IP parameters

Vertex

Track

event signature in rad
Event Signature in RAD

Mh

Mppg (MeV)

Preselection and Event Signature

OLD: 2 PNC + VTX

e=46%

Lint(2001) =95.7pb-1

NEW: 2 PNC + 2 TRK

e=49%

Lint(MC2005) =12.7pb-1

signal background3
Signal/background

Opening angle between calculated  and selected neutral

cluster from pnc, rejects background

two photons invariant mass
Two photons invariant mass

Measured

ALL

0

0



ALL

0

0



Corrected

Before cuts

ALL

0

0



ALL

0

0



Measured

Corrected

After cuts

two photons invariant mass corrected variables
Two photons invariant mass corrected variables

ALL

0

0



100 MeV < M< 170 MeV

()=39%

Bg=1%

control sample 01
Control Sample 0

ALL

0

0

BG



outlooks
Outlooks
  • Analysis in RAD stream:
    • Ilaria’s cuts to reject BG
    • Evaluate efficiency
    • Control sample
  • Analysis in KPM+RPI stream:
    • Evaluate efficiency