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The ALICE Cosmic Ray Physics Program

The ALICE Cosmic Ray Physics Program. Idea to create a task force to study this topic PPR volume 2 chapter 6 : Torino, Catania, Bologna, Bari, Mexico Starting from these works (2005) and continuing the job. Some run with cosmic ray trigger in february. Extensive Air Shower.

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The ALICE Cosmic Ray Physics Program

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  1. The ALICE Cosmic Ray Physics Program • Idea to create a task force to study this topic • PPR volume 2 chapter 6 : Torino, Catania, Bologna, Bari, Mexico • Starting from these works (2005) and continuing the job. • Some run with cosmic ray trigger in february

  2. Extensive Air Shower

  3. Atmospheric muons Rock composition over Alice Element H C O Na Mg Al Si K Ca Fe % 0.8 4.3 48.5 0.7 4.2 3.7 21.5 2.3 10.0 4.0 • Nm(Em >15 GeV) • Direction • Energy

  4. Main topics • Distribution of muon bundles (composition) • Measure on inclusive muons (single muon) • Study of muon interactions in the TPC • Cosmic ray events correlated with other LHC experiment • Study of the hadronic interaction models

  5. First works  AliRoot • Update and check the geometry of ACORDE in AliRoot • Test the Alice Environment : molasse, hall, shafts • Generate muons at the ground • Muons for allignment and calibration

  6. Alice environment

  7. Different Muon Generation • Flat muon distribution at fixed energy • Real inclusive muon generation • Muon coming from p, Fe primaries for the study of c.r. composition

  8. Tracking muons in the TPC and ITS

  9. Trigger condition • Running during standard Alice data taking imposes stringent conditions for cosmic trigger : • low trigger rate (few Hz) • live time constrictions (statistical problems) • We have to understand the trigger rate with the actual ACORDE geometry

  10. The Trigger Background • What is the influence of p-p events on cosmic trigger ? • What is the influence of p-gas interactions on cosmic trigger • Answered only the first question with old geometry : • simulation of 2000 p-p events MB @ 14 TeV (kPythia6 in Config.C) using AliRoot 4.02 • measure particles in a 5x5 m2 above the magnet • Only about 3% of events have charged particle background above the magnet

  11. Conclusions • Task force to start cosmic ray physics • Insert and check in AliRoot : ACORDE geometry, ALICE environment, Muon generations, Tracking in TPC and ITS • Alignment and Calibration (are in progress) • The Trigger conditions • Start physics topics and more refinated studies (inclusive muon, composition, point sources ….) People interested are welcome

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