Collective flow in (anti)proton-proton collision at Tevatron and LHC
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1 Collective flow in (anti)proton-proton collision at Tevatron and LHC Tanguy Pierog, K. Werner, Y. Karpenko, S. Porteboeuf Institut für Kernphysik, Karlsruhe, Germany XLVth Rencontres de Moriond, QCD, La Thuile March the 16th 2010 T. Pierog, KIT - 1/11
2 Outline Pseudorapidity and multiplicity Pt and <pt> Initial Conditions (energy density) Hydro on heavy ions Results T. Pierog, KIT - 2/11
3 The EPOS Model EPOS* is a parton model, with many binary parton-parton interactions, each one creating a parton ladder. Energy-sharing : for cross section calculation AND particle production Parton Multiple scattering Outshell remnants Screening and shadowing via unitarization and splitting Collective effects for dense systems EPOS can be used for minimum bias hadronic interaction generation (h-p to A-B) from 100 GeV (lab) to 1000 TeV (cms) : used for air shower! EPOS designed to be used for particle physics experiment analysis (SPS, RHIC, LHC) *T.Pierog, S. Porteboeuf and K. Werner T. Pierog, KIT - 3/11
4 New LHC data 900 GeV Inelastic multiplicity a bit high NSD OK 2360 GeV Inelastic OK NSD too low EPOS Inelastic EPOS NSD 2 T. Pierog, KIT - 4/11
5 New LHC data : pt (CMS) EPOS 900 GeV EPOS 2.36 GeV T. Pierog, KIT - 5/11
6 <pt> vs multiplicity : PYTHIA Evolution of mean pt with multiplicity originally not predicted by mini-jet type models (even with MPI) Lot of efforts to reproduce the data (new phenomenon needed : color reconnection, string interaction,...) Peter Skands T. Pierog, KIT - 6/11
7 <pt> vs multiplicity : EPOS 1.61 (2007) Since 2007 collective effects in EPOS for any system : Minimum energy density needed to start formation of core clusters Microcanonical decay with additional flow K. Werner Phys.Rev.Lett.98:152301,2007. Flow parametrized from SPS HI, RHIC HI and Tevatron ap-p p-p 14 TeV (prediction) ap-p 1.8 TeV (fit) HI at LHC : Last Call for Predictions Armesto et al. More development on collective effects in pp from other groups : D'Enterria et al. (arxiv: ), Solana et al. (arxiv: ), Chaudhuri (arxiv: ),... T. Pierog, KIT - 7/11
8 <pt> vs multiplicity : EPOS 1.99 (2009) Predictions of current EPOS version : Not real hydro : effective treatment (prev. slide) Already collective effect visible at 900 GeV Good agreement with preliminary LHC data p-p 900 GeV (prediction) EPOS with coll. eff. EPOS without coll. eff. T. Pierog, KIT - 8/11
9 Hydro in pp : Initial Conditions Initial conditions from multiple interactions : Energy density comparable to AuAu@RHIC Size comparable to size of fluctuations in AuAu@RHIC We propose (and we do) for pp : Hydrodynamical expansion + statistical decay based on EPOS flux tube initial conditions (event-by-event) T. Pierog, KIT - 9/11
10 Hydro for Heavy Ion Features Flux-tube initial condition Event-by-event treatment 3D core-corona procedure Tree flavor cross-over EoS (X3F) 3 + 1D hydro Complete hadron set (latest PDG) Hadronic cascade (HC), here UrQMD Checks : Centrality dependence of Yields and pt spectra of identified particles v2 and pt dependence of v2 of identified particles Particle correlations (eta-phi, HBT (in progress),...) T. Pierog, KIT - 10/11
11 Check with Heavy Ions : AuAu@RHIC Early freeze-out (166MeV) + hadr. cascade Full casc. Elastic casc. Important role of core-corona effect (K. Werner et al. J.Phys.G36:064030,2009) Full casc. Elastic casc. T. Pierog, KIT - 11/11
12 First Real Hydro in TeV : Tau Apply same parameters as for AuAu@RHIC (except flux tube radius = free parameter) 2 τ= τ= τ= τ=1.7 3 τ= τ= T. Pierog, KIT - 12/11
13 First Real Hydro in TeV : Radial Velocity Apply same parameters as for AuAu@RHIC (except flux tube radius = free parameter) 2 τ= τ= τ= τ= τ= τ= T. Pierog, KIT - 13/11
14 <pt> vs multiplicity TeV : EPOS 2 Using small flux tube size Very good description of CDF data No additional parameter Hadron mass dependence hydro+hadronic cascade No collective effects λ Ks Charged T. Pierog, KIT - 14/11
15 Summary EPOS 1.99 available in ALICE and ATLAS simulation software : Good description of min bias events up to 1.8 TeV (<10% error) pt (and correlation with Nch) in agreement with new measurements, but multiplicity a bit low (as other models) Collective effects done in an effective way already at 900 GeV Stronger effect at higher energy Change pt spectra of heavy particles up to few GeV Can be done using real hydro calculation On-going developments : EPOS 2 Real hydrodynamical evolution Selection of hard processes Both at the same time : underlaying events Sarah Porteboeuf's talk T. Pierog, KIT - 15/11
16 Initial Conditions T. Pierog, KIT - 16/11
17 Initial Conditions T. Pierog, KIT - 17/11
18 EoS T. Pierog, KIT - 18/11
19 AuAu : Kaon T. Pierog, KIT - 19/11
20 AuAu : Lambda T. Pierog, KIT - 20/11
21 AuAu : Di-hadron correlation T. Pierog, KIT - 21/11
22 p-p : Other Possible Observable T. Pierog, KIT - 22/11
23 Pt distribution CDF TeV with Hydro T. Pierog, KIT - 23/11
24 Pt distribution CDF TeV without Hydro T. Pierog, KIT - 24/11
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