Differences Between Sim09 Versions

Below is a list of all Sim09 versions, quickly describing new features and known issues. Fixes to problems of previous versions are not explicitly listed

Sim09m

Please see Gauss!104

  • First Gauss version used: v49r25

  • Update of EvtPhiDalitz for phi->pipipi0 to describe helicity angle distributions and bug fix in EvtVector3R model

  • Change of SIMCOND tags for 2017 pNe, see details at LHCBGAUSS-918

Sim09l

Please see Gauss!41

  • First Gauss version used: v49r22

  • Update of Bc_VHAD model to include new decays

  • New signal allowed with EPOS

  • Improvement in polarisation exchange between starlight and EvtGen

  • Bug fix for a generator level cut. See LHCBGAUSS-2468 and Gauss!792

Sim09k

Please see Gauss!18

  • First Gauss version used: v49r20

  • cut for diBoson events Gauss!672

  • new decay model for hyperons Gauss!676

  • bug fix in a decay model for Bs -> mu mu K K, triggering the new Sim09 version Gauss!693

  • new 4-body phase-space decay model in restricted mass window

Sim09j

Please see Gauss!11

  • First Gauss version used: v49r18

  • New decay models in EvtGen, MR Gauss!626 (merged) and port of Gauss!568 from master/HepForge. Does not effect physics

  • Update and new models in AmpGen, MR Gauss!640 (merged), triggering letter change

  • Allow axions to be generated with StarLight, Gauss!643 (merged)

  • Fix issues with gluons from Pythia8 without end vertex, Gauss!645 (merged), should not effect physics, but triggers letter change

Sim09i

  • First Gauss version used: v49r17

  • new default PDF for SuperChic2 (Gauss!9)

Sim09h

  • First Gauss version used: v49r14

  • Fixed Sim09g problem in EvtGen itself

  • Many updates to AmpGen, see Gauss!438

  • New model for Lc2pKpi

Known Issues

  • Broken signal particle gun

Sim09g

  • First Gauss version used: v49r13

  • Only bug-fixes

  • Change of SIMCOND tags for 2017 and 2018, see details at LHCBGAUSS-918

Known issues

  • Pythia8 can generate a10 that EvtGen cannot decay, resulting in infinite loop (does not affect physics)

  • Broken signal particle gun

Sim09f

  • First Gauss version used: v49r12

  • First release for 2018

  • Fix for angular model for $Lbz rightarrow Lzlepplepm$

  • Fix for BeautyTomuCharmTo3h to select oscillated particles

Known issues

  • Underlying event multiplicity due to handling of wide resonances, see slides

  • 2017+2018: Incorrect ECAL threshold used (same as 2016 data)

Sim09e

  • First Gauss version used: v49r11

  • First release for 2017

  • Changes to quarkonia from Pythia8, see LHCBGAUSS-1167

Known issues

  • Underlying event multiplicity due to handling of wide resonances, see slides

  • 2017: Incorrect ECAL threshold used (same as 2016 data)

Sim09d

  • First Gauss version used: v49r10

  • Updated particle properties (when Pythia called by EvtGen), for decays to partons

  • Resonance from Pythia with non-zero width

  • Modified model for $B_c^-rightarrowDstzmumantinumu$

Known issues

  • Underlying event multiplicity due to handling of wide resonances, see slides

Sim09c

  • First Gauss version used: v49r8

  • Set correctly incorrect ECAL threshold for 2016

  • New major DecFiles version and corresponding ParticleTable for light baryons

  • Fixes to EvtDDalitz (for Dp)

  • Fixed incorrect handling of $Bsrightarrow bar{K}^{*}mupmum$, see LHCBGAUSS-1097

  • Change of DDDB tag for all years and SIMCOND tags for 2015 and 2016, see details at LHCBGAUSS-918

Known issues

  • None

Sim09b

  • First Gauss version used: v49r5

  • First release for 2016

  • Fixed 2nd metal layer handling

  • Updated $tau$ handling with Tauola

  • Change in SIMCOND tag for 2016, see LHCBGAUSS-918

Known issues

  • 2016: L0 ECAL calibration correct (but incorrect in data)

Sim09a

  • Generators:

    • 2015: lower tracking $epsilon$ due to 2nd metal layer problem

    • EvtGen updated to PDG2014 particle properties

  • Geant4 9.6, no significant differences observed

  • VELO: error parameterisation and 2nd metal layer parameterisation

Known issues

  • 2015: lower tracking efficiency due to 2nd metal layer problem