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Km3 v4r5 and the OPA
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Transcript of Km3 v4r5 and the OPA
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Km3 v4r5 and the OPA
C.W.James, AWG meeting 30 Nov 2012
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Development version of km3: v4r5
• Changes from v4r4 (see Bologna presentation)
- Use of Nautilus glass- Couple of minor ‘bug’ fixes (no real effect expected)- Aug25 angular acceptance now standard (not
included in official v4r4 release)- Improved version of OPA should be working properly.
• Topics for today:- Show Nautilus glass- Show current v4r5 response to numu_CC events- Discuss OPA- Discuss scattering/absorption
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Benthos Nautilus glass
• It turns out that km3 has been using Benthos glass – which was the right thing to do, back in 1998…
- Glass absorbs photons- important in modelling the optical modules.- Measurements from: ANTARES-OM-98-1
- Mistake found using comparisons with Heide’s simulations for angular efficiency
Original numbers lost to time!
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Comparison of v4r5 to rbr v2
• 40 runs, all numu_CC and anumu_CC events – cumulative distribution. Decrease due to
- angular acceptance changes- gen being placed in seawater
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Comparison of v4r5 to rbr v2
• Ratio: relative decrease wrt run-by-run v2- (all three use august 2012 angular acceptance)
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Good news!
• The simulations are no longer getting any worse! (or at least, not by very much)
• Planned release version of v4r5 (this afternoon?) predicts the same number of muons of neutrino origin as v4r4
- (perhaps very slight decrease due to Nautilus glass?)
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Part 4: Preliminary OPA results(work by M. Dentler)
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One-particle approximation (OPA)
• Principles:
• Can not account for changes in shower shape.• Use gen to run pion showers and compare photon
yields
W-/W+/Z0
q
νl
q
l/νlM. Spurio, 2008
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Preliminary results from OPA investigation• Work finished; 95% of analysis finished; 50% of
‘pretty pictures’ finished.• Shower shape ‘important’ out to ~10m distance, • Pion weights: should be O~100% above 10 GeV
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Fit
• A rather complex function…- Fit log10[number of photons at shell 15] as a function
of pion energy
- Normalise to the number of photons from an electron at energy Ee (proportional to Ee)
- Invert:
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Implementation in km3mc
• In km3: use:- INOPA 1- Converts pion energy:
• Do not call GEASIM - ever
Calls OPA only if the particle is NOT a muon
Adds momentum to calculate the mean shower axis
Gets OPA weights
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OPA Weights
• Weight = 1 for e+-, gamma, pi0, some kaons
• Weight = [complex formula] if pi+-
• Weight = 0 otherwise
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Should we use the OPA?
• Comparison by Mona:- Run full pion shower- Run electron cascade of original OPA energy (constant
weight 0.2)- Run electron cascade of new OPA energy (variable
weight)- Run pion shower, but only include direct photons
• Compare number of photons incident at each shell. What do we get?
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Should we use the OPA?
• 35 m
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Should we use the OPA?
• 4m – shower shape effect
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Should we use the OPA?
• 8m – it’s fine
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Rbr results…• (sadly, still in the queue)
• Plan to use dusj shower reco as a test of the OPA in rbr scripts
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Discussion on scattering/absorption
[insert discussion here]
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