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Simulation for CMS HI

Simulation for CMS HI. Dipanwita Dutta Nuclear Physics Division Bhabha Atomic Research centre Mumbai, India. Outline. Part I. Cross-section of Z 0 (PYTHIA). Simulation and Reconstruction of Z 0 with CMKIN+OSCAR+ORCA. Muon Reconstruction with CMSSW. Part II.

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Simulation for CMS HI

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  1. Simulation for CMS HI Dipanwita Dutta Nuclear Physics Division Bhabha Atomic Research centre Mumbai, India 5-6 April,2007, India-CMS Meet, Chandigarh

  2. Outline Part I • Cross-section of Z0 (PYTHIA) • Simulation and Reconstruction of Z0 with CMKIN+OSCAR+ORCA • Muon Reconstruction with CMSSW Part II • Future Plan: Simulation for Small mass dimuon / Real Photon with CMS 5-6 April,2007, India-CMS Meet, Chandigarh

  3. Part I Simulation for Z0 5-6 April,2007, India-CMS Meet, Chandigarh

  4. Cross-Section of Z0 (PYTHIA) pp(Z0) (nb/GeV) Total For Pb-Pb minbias collision at 5.5 TeV (Z0+-) B A2pp(Z0) 68 b Z0 pT (GeV) 5-6 April,2007, India-CMS Meet, Chandigarh

  5. Cross-section and No. of Z0 for Pb+Pb collision s=5.5 TeV for Lint=0.5 nb-1 5-6 April,2007, India-CMS Meet, Chandigarh

  6. Differential and Integrated Rate of Z0 inPb+Pb collision , s=5.5 TeV for Lint=0.5 nb-1 │ Barrel+Endcap Barrel only 5-6 April,2007, India-CMS Meet, Chandigarh

  7. Muon Reconstruction • Tag from Muon chambers • Momentum resolution from Silicon Tracker • Local Muon Reconstruction (L1) • Stand-Alone Muon Reconstruction (L2) • Global Muon Reconstruction (L3) • (Combined with Tracker) 5-6 April,2007, India-CMS Meet, Chandigarh

  8. Simulation of Z0 +- channel Gen. vs. Rec. Muon from ORCA Gen Rec ORCA  pT (GeV) 5-6 April,2007, India-CMS Meet, Chandigarh

  9. Gen. – Rec. Muon pT,  5-6 April,2007, India-CMS Meet, Chandigarh

  10. Reconstruction without background Stand Alone Muon Reconstruction ORCA ORCA 5-6 April,2007, India-CMS Meet, Chandigarh

  11. Stand Alone Muon Reconstruction Reconstruction with HI Background ORCA 5-6 April,2007, India-CMS Meet, Chandigarh

  12. Summary :CMKIN-OSCAR-ORCA • Generation, Simulation and Reconstruction of Z0 performed with HI background using full CMS simulation package CMKIN, OSCAR, ORCA • Stand Alone Muon Reconstruction show poor mass resolution, Mass width~ 18 GeV at Z0 mass (m/m~0.2) • Mass Resolution remains unaltered with HI background using Stand Alone Muon Reconstruction • Global Muon Reconstruction with Tracker: Mass Resolution with HI background to be studied --- No further Support for ORCA 5-6 April,2007, India-CMS Meet, Chandigarh

  13. Reconstruction with CMSSW • CMSSW_1_2_2 downloaded and installed locally at BARC • Muon Reconstruction using CMSSW: Software available for pp, Reconstruction algorithms for HI under development • Involvement of BARC for HI Software transportation to CMSSW is required --Olga • Reconstruction using pp algorithm: Z0 Generation with PYTHIA using CMSSW Generator Interface -- Simulation+ Digitization--Local + Stand Alone Muon Reconstruction 5-6 April,2007, India-CMS Meet, Chandigarh

  14. Muon Reconstruction with CMSSW PT distribution of Generated and Reconstructed muons CMSSW 5-6 April,2007, India-CMS Meet, Chandigarh

  15. Reconstructed-Generated PT Difference CMSSW 5-6 April,2007, India-CMS Meet, Chandigarh

  16. Generated and Reconstructed Invariant Mass CMSSW m ~ 14 GeV 5-6 April,2007, India-CMS Meet, Chandigarh

  17. Part II Real Photon/ Small mass Dilepton 5-6 April,2007, India-CMS Meet, Chandigarh

  18. 5-6 April,2007, India-CMS Meet, Chandigarh

  19. 5-6 April,2007, India-CMS Meet, Chandigarh

  20. Direct Photons at Low pT – RHIC Result QM 2005: Data consistent with thermal+ NLO pQCD pQCD uncertain at low pT Gordon and Vogelsang Phys. Rev. D48, 3136 (1993) Thermal d’Enterria, Perresounko Eur.Phys.J.C46:451-464,2006 (a) New experimental method for the measurement of 5-6 April,2007, India-CMS Meet, Chandigarh

  21. Future Plan • Involvement in transportation as well as improvement of reconstruction HI softwares from OSCAR, ORCA to CMSSW • Global Muon Reconstruction with Tracker information included in CMSSW for Z0 +- • Simulation for low mass Dimuon/Photon channel-- Background muons – (DY and open charm and bottom) • Study the Thermal Dilepton signal (theoretical prediction) and possibility to see the effect of Chemical unsaturation 5-6 April,2007, India-CMS Meet, Chandigarh

  22. Thank You 5-6 April,2007, India-CMS Meet, Chandigarh

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