APFEL package and interface

Transcription

1 APFEL package and interface arxiv: Stefano Carrazza University & INFN Milan PDF4LHC - CERN December 13, in collaboration with Valerio Bertone and Juan Rojo Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

2 Introduction to APFEL APFEL is a public PDF evolution library with QED corrections Simple tool for PDF manipulation APFEL is composed by three modules: DGLAP, DIS, GUI APFEL structure APFEL output PDF Evolution Evolved PDFs PDF LHgrids APFEL LHAPDF DIS observables DIS NC/CC Observables Interactive Console ROOT APFEL Graphical User Interface PDF Plots DIS Plots Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, 013 / 14

3 APFEL evolution features APFEL evolution features: up to NNLO in QCD and LO in QED, FFNS and VFNS solution in x-space, Pole and MS heavy quark masses Technical features: interface to LHAPDF 5 & 6 (input/output) interfaces in Fortran, C/C++ and Python Benchmark against HOPPET, partonevolution, MSTW04QED [arxiv: ] 4 APFEL vs HOPPET evolution pole mass at Q = GeV 4 APFEL (QavDP) vs MRST evolution at Q = GeV QCD NNLO NLO QCD + LO QED ) xf(x,q δf (%) xb(x,q ) APFEL xc(x,q ) APFEL xs(x,q ) APFEL xu(x,q ) APFEL xd(x,q ) APFEL xg(x,q ) APFEL xd(x,q ) APFEL xu(x,q ) APFEL xs(x,q ) APFEL xc(x,q ) APFEL xb(x,q ) APFEL 4 3 xb(x,q ) HOPPET xc(x,q ) HOPPET xs(x,q ) HOPPET xu(x,q ) HOPPET xd(x,q ) HOPPET xg(x,q ) HOPPET xd(x,q ) HOPPET xu(x,q ) HOPPET xs(x,q ) HOPPET xc(x,q ) HOPPET xb(x,q ) HOPPET x 1 1 (a) HOPPET vs APFEL (QCD) ) xf(x,q δf (%) xu(x,q ) APFEL xd(x,q ) APFEL xs(x,q ) APFEL xg(x,q ) APFEL 4 3 xu(x,q ) MRST xd(x,q ) MRST xs(x,q ) MRST xg(x,q ) MRST x 1 1 (b) MSTW04 vs APFEL (QCD+QED) Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

4 APFEL DIS module The DIS module: Computation of DIS observables: all the NC and CC observables: F,F I, F 3 and reduced cross sections Up to order αs (when possible) Schemes: FONLL, FFNS and ZM-VFNS, Interface to APFEL evolution and/or LHAPDF c F (Q), NNPDF3_nnlo_as_0118.LHgrid FONLL, NNLO FFNS, NNLO ZMVN, NNLO x = 0.1 Target: Proton Projec: Electron Q (GeV) Generated by APFEL.0.0: V.Bertone, S.Carrazza, J.Rojo (arxiv: ) Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

5 APFEL DIS module The DIS module: Computation of DIS observables: all the NC and CC observables: F,F I, F 3 and reduced cross sections Up to order αs (when possible) Schemes: FONLL, FFNS and ZM-VFNS, Interface to APFEL evolution and/or LHAPDF Benchmark of NC F against FONLLdis [arxiv:01.31] 1 F c (x,q) at Q = GeV with FONLL-C APFEL.0.0 FONLLdis F l (x,q) at Q = GeV with FONLL-C APFEL.0.0 FONLLdis F c (x,q) 0.01 F l (x,q) e e x x Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

6 APFEL Graphical User Interface Why a Graphical User Interface (GUI)? APFEL GUI PDF plots: all LHAPDF grids PDF error treatment Evolution performed by APFEL and/or LHAPDF Computation of Luminosities Computation of DIS observables APFEL GUI.0.0: System requirements: ROOT, LHAPDF, Qt4 Plots cross-checked against PDF benchmarking 01 [arxiv: ] Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

7 APFEL Interactive Console APFEL provides the shell command apfel interactive access to all the APFEL functionalities Example: evolving the gluon PDF at x = 5 between and 0 GeV. Other examples: instantaneous PDF values, LHgrid generation luminosity computation, DIS observables computation, etc. Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

8 APFEL GUI.0.0 Possibility to select and tune the evolution of every single PDF set. takes as input PDFs from LHAPDF and the internal APFEL toy. simple and intuitive replacement/setup of evolution. Example Main window and PDF setup: Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

9 APFEL GUI.0.0 Functionalities: Member plot: PDF Flavor: physical basis. Uncertainties: Monte Carlo, Eigenstates, etc. Plot customization: axis range, colors, titles, etc. Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

10 APFEL GUI.0.0 Functionalities: All-in-on plot: PDG like plot with custom options. Possibility to save plots in: ps, eps, pdf, root, png. Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

11 APFEL GUI.0.0 Functionalities: PDF comparison: compares multiple PDF sets Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, 013 / 14

12 APFEL GUI.0.0 Functionalities: PDF comparison ratio: compares multiple PDF sets by performing the ratio Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

13 APFEL GUI.0.0 Functionalities: PDF luminosity: compares PDF luminosities: gg, q q, qg, c c, b b, cg, bg, qq, γγ, γg. Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

14 APFEL GUI.0.0 Functionalities: DIS observables compares DIS observables with different schemes. possibility to perform plots in function of x and Q Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14

15 Outlook Summary APFEL features PDF evolution library with QCD+QED combination DIS observables code based on FONLL GUI: a complete PDF analysis tool Coming soon: Interface to APPLgrid: DIS observables and evolution. Future web-application based on APFEL GUI.0.0. Code/manual and instructions: Stefano Carrazza (Unimi & INFN Milan) APFEL package and interface December 13, / 14