Target A hadronic int .. (R. Engle)

224 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
224
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Target A hadronic int .. (R. Engle)

  1. 1. TARGET A hadronic interaction model for studying inclusive muon and neutrino fluxes Ralph Engel (Forschungszentrum Karlsruhe, Germany) Giles Barr, Thomas K. Gaisser, Simon Robbins and Todor Stanev
  2. 2. Motivation and outline <ul><li>TARGET 3D (old version: 2.1, current version: 2.4) </li></ul><ul><li>very flexible and tunable hadronic interaction model </li></ul><ul><li>simple and fast Monte Carlo code </li></ul><ul><li>optimization for inclusive muon/neutrino fluxes </li></ul><ul><li>event generation structure and recent improvements </li></ul><ul><li>comparison to data </li></ul><ul><li>application: L3+C muon flux </li></ul>Ralph Engel, ICRC 2003
  3. 3. Event generation in TARGET <ul><li>simulation of one proton-air interaction </li></ul><ul><li>event type </li></ul><ul><li>leading particle (projectile) </li></ul><ul><li>nucleons from target nucleus </li></ul><ul><li>fast pions and kaons (correlated with leading particle) </li></ul><ul><li>slow pions and kaons (correlated with target nucleons) </li></ul><ul><li>baryon-antibaryon pair production </li></ul><ul><li>central pion and kaon production </li></ul><ul><li>multiplicity determined by energy conservation </li></ul><ul><li>cross sections: PDG data and Glauber approach </li></ul>Ralph Engel, ICRC 2003
  4. 4. Event generation in TARGET <ul><li>simulation of one proton-air interaction </li></ul><ul><li>event type </li></ul><ul><li>leading particle (projectile) </li></ul><ul><li>nucleons from target nucleus </li></ul><ul><li>fast pions and kaons (correlated with leading particle) </li></ul><ul><li>slow pions and kaons (correlated with target nucleons) </li></ul><ul><li>baryon-antibaryon pair production </li></ul><ul><li>central pion and kaon production </li></ul><ul><li>multiplicity determined by energy conservation </li></ul><ul><li>cross sections: PDG data and Glauber approach </li></ul>Ralph Engel, ICRC 2003
  5. 5. Nucleons: projectile/target fragmentation <ul><li>old version: </li></ul><ul><li>no target fragmentation nucleons </li></ul><ul><li>tuned to Eichten et al. data </li></ul><ul><li>data converted from double-differential cross sections </li></ul>Ralph Engel, ICRC 2003
  6. 6. Nucleons: projectile/target fragmentation <ul><li>new version: </li></ul><ul><li>target fragmentation nucleons </li></ul><ul><li>target and projectile nucleons symmetric </li></ul>Ralph Engel, ICRC 2003
  7. 7. Nucleons: comparison to other models <ul><li>large differences between models </li></ul><ul><li>inconsistent data </li></ul><ul><li>not very important for flux calculations </li></ul>Ralph Engel, ICRC 2003 (Gaisser & Honda, Ann. Rev. Nucl. Part. Sci. 52 (2002) 153)
  8. 8. Low-energy pion production (1) Ralph Engel, ICRC 2003 <ul><li>full phase space measurement </li></ul><ul><li>recoil nucleons change energy available for particle production </li></ul>
  9. 9. Low-energy pion production (2) Ralph Engel, ICRC 2003 <ul><li>full phase space measurement </li></ul><ul><li>slow pions from fragmentation of target nucleons </li></ul>
  10. 10. Low-energy pion production (3) Ralph Engel, ICRC 2003 <ul><li>full phase space measurement </li></ul><ul><li>pion multiplicity at small x too high? </li></ul>
  11. 11. Baryon-antibaryon pair production Ralph Engel, ICRC 2003 <ul><li>no data for nuclear targets </li></ul><ul><li>scaled p-p cross sections and distributions used </li></ul><ul><li>production of anti- protons, neutrons and lambdas </li></ul>
  12. 12. Comparison with p-Be at 24 GeV (1) Ralph Engel, ICRC 2003 <ul><li>almost no change of distributions at higher energy </li></ul>
  13. 13. Comparison with p-Be at 24 GeV (2) Ralph Engel, ICRC 2003 <ul><li>almost no change of distributions at higher energy </li></ul>
  14. 14. Comparison to L3+C muon measurement Ralph Engel, ICRC 2003 <ul><li>TARGET predictions: good description of L3+C data </li></ul><ul><li>SIBYLL gives similarly good description </li></ul><ul><li>QGSjet: too few fast pions </li></ul>(see talks by M. Unger, HE 2.1.10 and T. Stanev, HE 2.4.9)
  15. 15. Comparison of high-energy models <ul><li>inclusive charged pion spectra </li></ul><ul><li>p-air collisions, E lab = 500 GeV </li></ul><ul><li>fast pions very important </li></ul>Ralph Engel, ICRC 2003
  16. 16. Summary and outlook Ralph Engel, ICRC 2003 <ul><li>TARGET: simple and very flexible event generator </li></ul><ul><li>version 2.4: </li></ul><ul><li>implementation of processes needed for comparison to forthcoming HARP/NA49 data </li></ul><ul><li>improved description of low-energy data </li></ul><ul><li>minor changes at high energy </li></ul><ul><li>plans: additional fine-tuning and release of new version </li></ul>
  17. 17. Pions: comparison to other models <ul><li>large differences between models at low and high x </li></ul><ul><li>some data sets inconsistent </li></ul><ul><li>very important for flux calculations </li></ul>Ralph Engel, ICRC 2003 (Gaisser & Honda, Ann. Rev. Nucl. Part. Sci. 52 (2002) 153)
  18. 18. Muon flux charge ratio <ul><li>charge ratio very sensitive to leading particle production </li></ul><ul><li>slightly too many fast neg. pions in new version of TARGET </li></ul><ul><li>fine-tuning in progress </li></ul>Ralph Engel, ICRC 2003

×