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Update History

For the record, in Tables [*] and [*] we list the official main versions of JETSET and PYTHIA, respectively, with some brief comments.


Table: The main versions of JETSET, with their date of appearance, published manuals, and main changes from previous versions.
No. Date Publ. Main new or improved features
1 Nov 78 [Sjö78] single-quark jets
2 May 79 [Sjö79] heavy-flavour jets
3.1 Aug 79 -- 2-jets in $\mathrm{e}^+\mathrm{e}^-$, preliminary 3-jets
3.2 Apr 80 [Sjö80] 3-jets in $\mathrm{e}^+\mathrm{e}^-$ with full matrix elements,
      toponium $\to \mathrm{g}\mathrm{g}\mathrm{g}$ decays
3.3 Aug 80 -- softer fragmentation spectrum
4.1 Apr 81 -- baryon production and diquark fragmentation,
      fourth-generation quarks, larger jet systems
4.2 Nov 81 -- low-$p_{\perp}$ physics
4.3 Mar 82 [Sjö82] 4-jets and QFD structure in $\mathrm{e}^+\mathrm{e}^-$,
  Jul 82 [Sjö83] event-analysis routines
5.1 Apr 83 -- improved string fragmentation scheme, symmetric
      fragmentation, full 2 $^{\mathrm{nd}}$ order QCD for $\mathrm{e}^+\mathrm{e}^-$
5.2 Nov 83 -- momentum-conservation schemes for IF,
      initial-state photon radiation in $\mathrm{e}^+\mathrm{e}^-$
5.3 May 84 -- `popcorn' model for baryon production
6.1 Jan 85 -- common blocks restructured, parton showers
6.2 Oct 85 [Sjö86] error detection
6.3 Oct 86 [Sjö87] new parton-shower scheme
7.1 Feb 89 -- new particle codes and common-block structure,
      more mesons, improved decays, vertex information,
      Abelian gluon model, Bose-Einstein effects
7.2 Nov 89 -- interface to new standard common block,
      photon emission in showers
7.3 May 90 [Sjö92d] expanded support for non-standard particles
7.4 Dec 93 [Sjö94] updated particle data and defaults


Table: The main versions of PYTHIA, with their date of appearance, published manuals, and main changes from previous versions.
No. Date Publ. Main new or improved features
1 Dec 82 [Ben84] synthesis of predecessors COMPTON, HIGHPT and
      KASSANDRA
2 --    
3.1 --    
3.2 --    
3.3 Feb 84 [Ben84a] scale-breaking parton distributions
3.4 Sep 84 [Ben85] more efficient kinematics selection
4.1 Dec 84   initial- and final-state parton showers, $\mathrm{W}$ and $\mathrm{Z}$
4.2 Jun 85   multiple interactions
4.3 Aug 85   $\mathrm{W}\mathrm{W}$, $\mathrm{W}\mathrm{Z}$, $\mathrm{Z}\mathrm{Z}$ and $\mathrm{R}$ processes
4.4 Nov 85   $\gamma \mathrm{W}$, $\gamma \mathrm{Z}$, $\gamma\gamma$ processes
4.5 Jan 86   $\H ^0$ production, diffractive and elastic events
4.6 May 86   angular correlation in resonance pair decays
4.7 May 86   $\mathrm{Z}'^0$ and $\H ^+$ processes
4.8 Jan 87 [Ben87] variable impact parameter in multiple interactions
4.9 May 87   $\mathrm{g}\H ^+$ process
5.1 May 87   massive matrix elements for heavy quarks
5.2 Jun 87   intermediate boson scattering
5.3 Oct 89   new particle and subprocess codes, new common-block
      structure, new kinematics selection, some
      lepton-hadron interactions, new subprocesses
5.4 Jun 90   $s$-dependent widths, resonances not on the mass shell,
      new processes, new parton distributions
5.5 Jan 91   improved $\mathrm{e}^+\mathrm{e}^-$ and $\mathrm{e}\mathrm{p}$, several new processes
5.6 Sep 91 [Sjö92d] reorganized parton distributions, new processes,
      user-defined external processes
5.7 Dec 93 [Sjö94] new total cross sections, photoproduction, top decay
6.1 Mar 97 [Sjö01] merger with JETSET, double precision, supersymmetry,
      technicolor, extra dimensions, etc. new processes,
      improved showers, virtual-photon processes
6.2 Aug 01 [Sjö01a] Les Houches Accord user processes, $R$-parity violation
6.3 Aug 03 [Sjö03a] improved multiple interactions, $p_{\perp}$-ordered showers,
      SUSY Les Houches Accord interface
6.4 Mar 06 this none so far



Subsections
next up previous contents
Next: Versions before 6.1: Up: Program Overview Previous: Program Overview   Contents
Stephen Mrenna 2007-10-30