Transcript MINERvA-ppi0ana(2007Jun27)

Update on p   final state study
0
Jaewon Park
University of Rochester
MINERvA/Jupiter Group Meeting, June 27, 2007
2
Pi0 CAL
Old plot
 New code (batch mode) doesn’t have high side tail in (recoE-trueE)/trueE plot.
 Further event selection can be applied.
 Old analysis didn’t use n_hadron=2 condition. It’ll try to process “p pi0 pi-” even
t.
3
Number of reconstructed tracks
 If no proton track is foun
d, it’s not easy to reconst
ruct primary vertex.
Number of gamma tracks
Gamma2 nTrk
Number of proton tracks
E( 1 )  E( 2 )
Gamma1 nTrk
Proton nTrk vs. KineticE
 It’ll be useful to compar
e gamma direction from
track and gamma directi
on from energy vector.
4
Reconstructed primary vertex
 Reconstructed primary vertex
is calculated from proton track
’s start position.
 Assuming proton makes ioniza
tion immediately, some of eve
nts are out of expected error.
 If x or y coordinate is off, z co
ordinate is also off.
recoX-trueX
recoY-trueY
Good event
Strange event
recoZ-trueZ
(recoX-trueX) vs. (recoZ-trueZ)
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What’s going on?
 Wrong startpos(nRecon) ntupl
e variable is found.
PAW > nt/scan 1 event=471 ! ! ! ntruth nptrue ntmoth vztrue
+-------+--------+---------+--------+----------+
| Event | ntruth | nptrue | ntmoth |
vztrue |
+-------+--------+---------+--------+----------+
|
471 | 8
|
|
|
|
| *
1 |
| 14
| 0
| -75.6783 |
| *
2 |
| 2212
| 0
| -75.6783 |
| *
3 |
| 111
| 0
| -75.6783 |
| *
4 |
| 22
| 3
| -75.6783 |
| *
5 |
| 22
| 3
| -75.6783 |
| *
6 |
| 2212
| 2
| -12.0367 |
| *
7 |
| 2212
| 2
| -12.0367 |
| *
8 |
| 2212
| 6
| 31.9961 |
+-------+--------+---------+--------+----------+
PAW > nt/scan 1 event=471 ! ! ! nrecon iTrk ipTrk
+-------+--------+------+-------+---------------+
| Event | nrecon | itrk | iptrk | startpos(3,i) |
+-------+--------+------+-------+---------------+
|
471 | 4
|
|
|
|
| *
1 |
| 2
| 2212 | -13.5231
|
| *
2 |
| 5
| 22
| 32.15
|
| *
3 |
| 6
| 2212 | -13.5231
|
| *
4 |
| 8
| 2212 | 32.15
|
+-------+--------+------+-------+---------------+
 Green star(★) in aegis e
vent display means reco
startpos(3,1)
nstructed primary vertex
 Red circle(☻) is true pri
mary vertex
Same value