1. Newt Ganugapati and Teresa Montaruli
Down going Muon Analysis/ Atmospheric Air Shower Simulation Involving Charm Production and some results from PYTHIA/FRITIOF
Newt Ganugapati and
Teresa Montaruli

2. Methodology
Cosmic Ray muons are simulated using Corsika 6.03 and QGSJET01 hadronic
interaction model and detector response obtained using trigger conditions and
events are reconstructed.
Physics measurement of the true muon Intensity from experimental data will have to account for triggering & reconstruction efficiencies.
Assumed that the ratio of events for which the detector triggers (reconstructed events) to the true events generated remains the same in the data and the simulation to get the Physical measurement of the flux from experimental data by the method of
diaogonal unfolding
Finite angular resolution so what we reconstruct is not the true angle meaning that inter bin correlations in zenith angle are not negligible .

3. Methodology (Continued)
Adjust the bin size in zenith angle in such a way as to minimize the interbin correlations in zenith angle (leakage from one to other). Larger bin sizes when angular resolution is bad!
Basic quality cuts to improve reconstruction
Track Length, Chi Square, Difference of Odd and Even hits from a time ordered hit sample.

4. ZENITH ANGLE ACCEPTANCE PLOT

5. SIMULATION DISCREPANCIES AND INTERACTION MODEL
Energy(GeV)
L3+C data
Source: Ralph Engel

6. Angular Resolution Before quality After quality Zenith Space Angle
RecoSpace-TrueSpace(degrees)
RecoSpace-TrueSpace(degrees)
Before quality
Note the skewed nature of these distributions!
After quality

7. Zenith and Space Angle Resolution
The point is marked at the mean while the error bar quantifies RMS value

8. Time Residuals and Convoluted Pandel
Data
BG MC
Excess Earlyhits
in MC
Time delay(ns)(16 PPandel)
Time delay(ns)(64 CPandel)

9. Air Shower Dmesons also produced
(D0,D,Ds and other Kinds) that decay to Prompt muons
During the production Of these D mesons are there any π ± / K± also that are produced
(subsequently decay to muons) ?If so statistically what fraction of Momentum/energy do these
π ± / K± take?

10. PYTHIA SIMULATION
Make PP with PYTHIA then consider the momentum taken by the charm production with appropriate energy processes
Subtract it to the Pbeam and use the Pbeam to make an event P-N with FRITIOF and this should account for the nucleons and production of accompanying π ±, K±
a) Compare output of FLUKA with existing code
b) Plots of D0,D,DS and , π ± , K±
c) Compare average charm to average π ± , K± energy as a function of beam energy
d) Some conclusion about the muons

11. COMPARISION OF FLUKA/PYTHIA For 100TeV INCIDENT PROTON
E/Eproton

12. Number Of Particle and Energy (Mean)
The RMS value is shown as an error bar!

13. Particle Flux From PYTHIA/FRITIOF For Charm Particle Production
E/Eproton

14. Lateral Distribution
All particles allowed to decay and the lateral separation between the muons at AMANDA depth (for 65 degrees horizontal muons) is obtained from geometry

15. Energy Of Prompts at Surface