Update on final state study
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Update on final state study. Jaewon Park University of Rochester. MINERvA/Jupiter Group Meeting, June 27, 2007. Pi0 CAL. New code (batch mode) doesn’t have high side tail in (recoE-trueE)/trueE plot. Further event selection can be applied.

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Update on final state study

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Update on final state study

Update on final state study

Jaewon Park

University of Rochester

MINERvA/Jupiter Group Meeting, June 27, 2007


Pi0 cal

Pi0 CAL

  • 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-” event.

Old plot


Number of reconstructed tracks

Number of reconstructed tracks

  • If no proton track is found, it’s not easy to reconstruct primary vertex.

  • It’ll be useful to compare gamma direction from track and gamma direction from energy vector.

Number of proton tracks

Number of gamma tracks

Gamma2 nTrk

Gamma1 nTrk

Proton nTrk vs. KineticE


Reconstructed primary vertex

Reconstructed primary vertex

  • Reconstructed primary vertex is calculated from proton track’s start position.

  • Assuming proton makes ionization immediately, some of events are out of expected error.

  • If x or y coordinate is off, z coordinate is also off.

recoX-trueX

recoY-trueY

Good event

Strange event

recoZ-trueZ

(recoX-trueX) vs. (recoZ-trueZ)


What s going on

What’s going on?

  • Wrong startpos(nRecon) ntuple 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 |

+-------+--------+---------+--------+----------+

  • Green star(★) in aegis event display means reconstructed primary vertex

  • Red circle(☻) is true primary vertex

PAW > nt/scan 1 event=471 ! ! ! nrecon iTrk ipTrk startpos(3,1)

+-------+--------+------+-------+---------------+

| 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 |

+-------+--------+------+-------+---------------+

Same value


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