Km3 v4r5 and the opa
Download
1 / 18

Km3 v4r5 and the OPA - PowerPoint PPT Presentation


  • 66 Views
  • Uploaded on

Km3 v4r5 and the OPA. C.W.James , AWG meeting 30 Nov 2012. 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)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Km3 v4r5 and the OPA' - ginny


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Km3 v4r5 and the opa

Km3 v4r5 and the OPA

C.W.James, AWG meeting 30 Nov 2012


Development version of km3 v4r5
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

  • C.W.James, AWG telecon, 30th Nov 2012


    Benthos nautilus glass
    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!

    C.W.James, AWG telecon, 30th Nov 2012


    Comparison of v4r5 to rbr v2
    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

    C.W.James, AWG telecon, 30th Nov 2012

    4


    Comparison of v4r5 to rbr v21
    Comparison of v4r5 to rbr v2

    • Ratio: relative decrease wrt run-by-run v2

      • (all three use august 2012 angular acceptance)

    5

    C.W.James, AWG telecon, 30th Nov 2012


    Good news
    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?)

    6

    C.W.James, AWG telecon, 30th Nov 2012


    Part 4 preliminary opa results work by m dentler
    Part 4: Preliminary OPA results(work by M. Dentler)

    C.W.James, AWG telecon, 30th Nov 2012


    One particle approximation opa
    One-particle approximation (OPA)

    q

    q

    • Principles:

    • Can not account for changes in shower shape.

    • Use gen to run pion showers and compare photon yields

    W-/W+/Z0

    l/νl

    νl

    M. Spurio, 2008

    C.W.James, AWG telecon, 30th Nov 2012


    Preliminary results from opa investigation
    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

    C.W.James, AWG telecon, 30th Nov 2012


    Km3 v4r5 and the opa
    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:

    C.W.James, AWG telecon, 30th Nov 2012


    Implementation in km3mc
    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

    C.W.James, AWG telecon, 30th Nov 2012


    Opa weights
    OPA Weights

    • Weight = 1 for e+-, gamma, pi0, some kaons

    • Weight = [complex formula] if pi+-

    • Weight = 0 otherwise

    C.W.James, AWG telecon, 30th Nov 2012


    Should we use the opa
    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?

  • C.W.James, AWG telecon, 30th Nov 2012


    Should we use the opa1
    Should we use the OPA?

    • 35 m

    C.W.James, AWG telecon, 30th Nov 2012


    Should we use the opa2
    Should we use the OPA?

    • 4m – shower shape effect

    C.W.James, AWG telecon, 30th Nov 2012


    Should we use the opa3
    Should we use the OPA?

    • 8m – it’s fine

    C.W.James, AWG telecon, 30th Nov 2012


    Rbr results
    Rbr results…

    • (sadly, still in the queue)

    • Plan to use dusj shower reco as a test of the OPA in rbr scripts

    C.W.James, AWG telecon, 30th Nov 2012


    Discussion on scattering absorption
    Discussion on scattering/absorption

    [insert discussion here]

    C.W.James, AWG telecon, 30th Nov 2012


    ad