HIJING++, a Monte Carlo Jet Event Generator for the Future Collider Experiments
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1 HIJING++, a Monte Carlo Jet Event Generator for the Future Collider Experiments Speaker: Gergely Gábor Barnaföldi, Wigner RCP of the H.A.S. Group: GGB, G. Bíró, Sz.M. Harangozó, W.T. Deng, M. Gyulassy, G.Y. Ma, P. Lévai, G. Papp, X.N. Wang, B.W. Zhang Tihany Workshop 2017, Tihany, Hungary, 19-20th June 2017
2 Outline Motivation for HIJING++ Technical details of the HIJING++ The structure of the program Simulation framework New physics & tests Code validation in proton-proton collisions New improvement: Scale-dependent HIJING shadowing Outlook... 2
3 HIJING++ (C++ based HIJING version 3.1 with parallel opportunities) 9
4 The HIJING++ HIJING(Heavy-Ion Jet INteraction Generator) 易經 Bagua (eight simbols) fundamental principles of reality adjoint representation 8 of SU(3) 10
5 The HIJING++ HIJING(Heavy-Ion Jet INteraction Generator) 易經 Bagua (eight simbols) fundamental principles of reality adjoint representation 8 of SU(3) 11
6 What is the real HIJING??? It is a BIG mess. 12
7 We need BIG Wizards to manage it... and the need for a magic stick... 13
8 We need BIG Wizards to manage it... 14
9 HIJING++ (C++ based HIJING version 3.1 with parallel opportunities) 15
10 The HIJING++ HIJING(Heavy-Ion Jet INteraction Generator) HIJING versions FORTRAN v1.36, v2.553 C++ v3.0 Reasons to use C++ Object oriented language: Hierarchy, Modularity C++11/14 has thread support and compatibility with OpenCL 16
11 Program Flow in general Pair-by-pair nucleon-nucleon events Multiple soft gluon exchanges between valence- and di-quarks String hadronization according to Lund fragmentation scheme 17
12 Program Flow old one Generation of kinetic variables for each hard scattering with Pythia 5.3 Multiple soft gluon exchanges between valence- and di-quarks String hadronization according to Lund fragmentation scheme 18
13 Program Structure Pythia8 namespace containers Structure similarities Actual program flow is more complicated 19
14 Program Structure HIJING Pythia8 namespace containers Event allpart PYTHIA Structure similarities Actual program flow is more complicated Info Event process Event string NucleusLevel Cronin-effect Jet-quenching Shadowing 20
15 Program Structure Pythia8 namespace containers Structure similarities Actual program flow is more complicated New: HijManager 21
16 Program Structure Hijing class Processes ordered in class hierarchy Former common blocks class variables Processes called through object functions // Class for handling the hard collisions // Class for handling the soft interactions // Class for handling the Lund string fragmentation // Class for the nuclear effects 22
17 The 'main' example Usual form kept for regular users Form also similar to Pythia 8.x FORTRAN C++ 23
18 Program Features Calculation by improved models Pythia like prompt Histogram creation CPU level Parallel computing AliRoot compatibility (planned) 24
19 Dependencies & External packages Boost sudo apt-get install libboost-all-dev LHAPDF 6./configure prefix=$home/.../share/lhapdf make all insert downloaded PDF library to $HOME/.../share/LHAPDF optionally modify pdfsets.index, add set if needed export LD LIBRARY PATH=<library path> Pythia 8./configure --with-lhapdf6-lib=$home/ /lib \ --with-boost-lib=/usr/lib/x86_64-linux-gnu make j4 GSL (optional) HIJING make option 25
20 Data Analysis Pythia 8 Histogram class available Selection has to be made for every particle Hist::fill(double Input); Normalization standard output and file output both provided 26
21 FIRST TESTS, RESULTS, & PREDICTIONS with HIJING++ 27
22 Physics tests: pp collisions Code validation with old version and data in pp at RHIC energies Data: STAR Collaboration, Phys.Lett. B637 page (2006) 29
23 Physics tests: pp collisions Code validation with old version and data in pp at LHC energies Data: ALICE Collaboration, Eur. Phys. J. C (2013) 30
24 Physics tests: pp collisions Predictions for the highest energy pp collisions at LHC energies Data: ALICE preliminary 31
25 Physics tests: pa (ongoing) The pa features PYTHIA5.x vs PYTHIA8.x plenty of new physics: try to avoid double counting in HIJING++ GRV98 were include to LHAPDF6 for backward compatibility Nuclear shadowing: many kinds available, new Q-dependent version of the HIJING shadowing parametrization. Jet Quenching: several models Soft QCD radiation (incl. since v1.36), new calls for ARIADNE Data: ALICE 5.02 TeV p+pb 32
26 First caclulations: pp & ppb HIJING++ ppb comparison (y=0) Test: hadron spectra az 5.02 & 8 TeV HIJING++ to Theory (ktpqcd, AMPT) PYTHIA8 on pp AMPT ppb 33
27 First caclulations: pp & ppb HIJING++ ppb comparison (y=0) Test: hadron spectra az 5.02 & 8 TeV HIJING++ to Theory (ktpqcd, AMPT) PYTHIA8 on pp AMPT ppb ktpqcd_v21 with HIJING & EPS09 HIJING++ to LHC data: ALICE 5.02 TeV pp & ppb 34
28 First predictions: pp & ppb HIJING++ pp & ppb comparison by R. Vogt (soon on the arxiv) Prediction: hadron spectra 8 TeV HIJING++ to Theory at 8 TeV PYTHIA8 on pp EPS09NLO AMPT on ppb ktpqcd_v21 on pp & ppb Results: Differences at pp level Similar spectra in ppb 35
29 First predictions: pp & ppb HIJING++ pp & ppb comparison by R. Vogt (soon on the arxiv) Prediction: hadron spectra 8 TeV HIJING++ to Theory at 8 TeV PYTHIA8 on pp EPS09NLO AMPT on ppb ktpqcd_v21 on pp & ppb Results: Major differences for K & p 36
30 First predictions: ppb heavy hadrons 37
31 First predictions: pp & ppb HIJING++ pp & ppb comparison by R. Vogt (soon on the arxiv) Prediction: rapidity distribution 8 TeV HIJING++ to Theory at 8 TeV PYTHIA8 on pp rcbk bcgc Results: Major deviance for PYTHIA8 at midrapidity is coming from minijets 38
32 First predictions: ppb heavy hadrons 39
33 First predictions: pp & ppb HIJING++ pp & ppb comparison by R. Vogt (soon on the arxiv) Prediction: HIJING++ to Theory at 8 TeV ktpqcd_v21 with EPS09 & HIJING EPS09NLO Results: Better agreement with EPS09 No relevant difference between π, K, p 40
34 First predictions: ppb heavy hadrons HIJING++ ppb rapidity dependence Prediction at various rapidity: Results: To the y>0 similar trends On the y<0 yields increase with mass 41
35 What is the next??? 42
36 Physics tests: RpPb(pT) NEW HIJING shadowing (npdf) Test: Nuclear Modification Factor Theory (HIJING 2.553) Q2-dependent HIJING shadowing with multiple scattering EPS09s with NO multiple scattering Data: ALICE 5.02 TeV p+pb 43
37 Physics tests: shadowing with Q 2 Old HIJING shadowing (npdf) PDF are based on GRV98lo A & Isospin effects: averaging p/n PDFs Geometry (b-dependence) is given by a simple geometry factor NO Multiple scattering included! NO Q2-scale parametrization for the shadowing function, Sa/A(x) QCD scale were factorized in PDF ONLY NO flavor dependence included only q/g 44
38 Physics tests: shadowing with Q 2 NEW HIJING shadowing (npdf) PDF are based on GRV98lo A & Isospin effects: averaging p/n PDFs Geometry (b-dependence) is given by a simple geometry factor NO Multiple scattering included! Old Q2-scale parametrization is fixed for Q2=2 GeV2, DGLAP evolution is calculated by HOPPET code, Sa/A(x,Q2) DGLAP Q2 evolution were parametrized ONLY g/q difference in the corrections 45
39 Physics tests: shadowing with Q 2 NEW HIJING shadowing (npdf) PDF are based on GRV98lo A & Isospin effects: averaging p/n PDFs Geometry (b-dependence) is given by a simple geometry factor NO Multiple scattering included! Old Q2-scale parametrization is fixed for Q2=2 GeV2, DGLAP evolution is calculated by HOPPET code, Sa/A(x,Q2) DGLAP Q2 evolution were parametrized ONLY g/q difference in the corrections 46
40 Summary HIJING++ Coding from FORTRAN C++ has been done One more step HijCore & HijManager were introduced Performance (parallel) tests are ongoing and promising First PHYSICS Physics tests has been started Soon on the arxiv (preliminary results and comparisons by R. Vogt et al) Next PYSICS Step-by-step reconsidering of nuclear effect (shadowing with Q 2, jet quenching) stay tuned. 47
41 Proposed Events 12th High-pT Physics for the RHIC and LHC Era HpT4LHC Date: 2-5 October, 2017 Organizers: Bergen, at the University of Bergen (UiB), Western Norway University of Applied Sciences (HVL) Web: under construction Maybe WG3 meeting? New perspectives on Neutron Star Interiors Date: 9-13 October, 2017 ECT*, Trento, Italy Web: 48
42 BACKUP 49
43 First predictions: ppb heavy hadrons 50
44 First predictions: ppb heavy hadrons 51
45 First predictions: ppb heavy quarks 52
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