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Index: trunk/NEWS
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This file contains the history of SISCone releases. For each one,
we give a short summary of the important changes from the previous
version. If you want to see a more detailed list of changes, please
read the ChangeLog file.
SISCone version 3.0.5 (April 22 2020)
=====================
-* Minor release, fixed sign/unsigend warning in bitshift operation
+* Minor release, fixed signed/unsigned warning in bitshift operation
(version to be included in FastJet>=3.3.4)
SISCone version 3.0.4 (October 1 2018)
=====================
* Minor release, improved shared library handling by fixing
inter-dependences. (version to be included in FastJet>=3.3.2)
SISCone version 3.0.3 (August 3 2016)
=====================
* Minor release, installing config.h to include flags decided at
configure time. (version to be included in FastJet>=3.2.1)
SISCone version 3.0.2 (March 16 2016)
=====================
* Minor release, fixing a bug due to an array being used uninitialised
(no impact on results). Also replaced auto_ptr by unique_ptr when
supported by compiler (version to be included in FastJet>=3.2.0)
SISCone version 3.0.1 (February 29 2016)
=====================
* Minor release, fixing a bug due to a rounding issue that occurs the
theta range in (rare) specific configurations where theta=pi in the
split-merge procedure for spherical SISCone
SISCone version 3.0.0 (September 9 2014)
=====================
* Added the option of running SISCone with progressive removal,
corresponding to the following algorithm:
1. search for stable cones
2. declare the hardest stable cone a jet and remove its particles
from the list of remaining particles
3. if there are some remaining particles, go back to 1.
Use Csiscone::compute_jets_progressive_removal(...) for this version
of SISCone
The scale used to determine which is the hardest stable cone can be
chosen amongst the same options as the scale used for the
split--merge step [SM_pttilde by default for the pp version of
SISCone, SM_Etilde for the spherical version]. Alternatively, a
user-defined scale choice can be provided using set_user_scale(...).
Version to be included in FastJet>=3.1.0
SISCone version 2.0.6 (April 9 2013)
=====================
* Minor release fixing an issue concerning the installation of
configuration headers and bringing small updates in the autotools
build system (version to be included in FastJet>=3.0.4)
SISCone version 2.0.5 (January 17 2012)
=====================
* Minor release bringing minor improvements to the build system
(version to be included in FastJet>=3.0.2)
SISCone version 2.0.4 (November 25 2011)
=====================
* Minor release to remove a few gcc warnings when compiled with
high warning level (-ansi -pedantic -Wextra -Wshadow)
(version to be included in FastJet>=3.0.1)
SISCone version 2.0.3 (October 5 2011)
=====================
* Minor release to fix a badly documented Etilde variable in the
spherical version of SISCone and to remove a few gcc warnings
(version to be included in FastJet 3.x)
SISCone version 2.0.2 (May 2011)
=====================
* minor modifications to the build system
(version to be included in FastJet 3.x)
SISCone version 2.0.1 (May 2009)
=====================
* enabled shared libraries by default
[that was the source of a bug in fastJet]
* replaced _R with _radius to fix build problems on old OSX systems
* fixed some syntax inconsistencies in Makefile.am's
SISCone version 2.0.0 (Apr 2009)
=====================
* Added a spherical version of SISCone for use in e+e- collisions
This typically works in the same way as the pp version of SISCone
with the following remarks:
- the classes fot the spherical versions of SISCone are prefixed by
'CSph' instead of 'C' (e.g. CSphMomentum CSphSISCone)
- the cone radius is defined as its half opening angle (particle
distances are also defined through the angle they define, or,
equivalently, as distances on the surface of a unit sphere)
- For ordering the protojets during the split--merge, we use
E_tilde defined as
/ |p_i X p_J|^2 \
\sum_{i\in J} E_i | 1 + --------------- |
\ |p_i|^2 E_J^2 /
Note that the computation of the overlap uses the "plain" energy
* Added a flag (Csiscone::use_pt_weighted_splitting) to modify the
split part of the split-merge procedure in such a way that a shared
particle i is assigned the one of the overlapping jets j=1,2 that
has the smaller value of DeltaR_{ij}/p_{tj}. This produces more
circular jets.
* fixed a bug in the computation of the rapidity range in the
split-merge step
* the protocones list now contains the full 4-momentum information
(rather than just eta and phi)
* fixed bugs in example/test.cpp
SISCone version 1.3.3 (Aug 2008)
=====================
* added bugfix for g++-4.3 (missing headers for "exit")
SISCone version 1.3.2 (Mar 2008)
=====================
* VERSION and PROGRAM (or PACKAGE_NAME) are no longer accessible
directly because of potential conflicts with other packages.
You should use siscone_version() and siscone_package_name()
instead. (Thanks to Rolf Seuster)
* allow the users to set their own default compilation flags.
SISCone version 1.3.1 (Mar 2008)
=====================
* fixed some compilation issues under windows
SISCone version 1.3.0 (Nov 2007)
=====================
* The main update in this new release is the switch to
'autotools'. This means that instead of using the (static) Makefile
build process, you can now use the "standard ./configure; make; make
install" approach. See the INSTALL file for details.
* added a 'siscone_area' example of how jet areas work within SISCone.
SISCone version 1.2.0 (Jun 2007)
=====================
* 10-15% speed increase by introducing a tiling in the eta-phi plane
allowing for better overlap checking in the split--merge. This can
turn into a bigger effect for area computations.
* implementing a 'jet area' class to compute active and/or passive
areas.
* in examples:
- fix bug in the cmdline parsing (there was a segfault with
unrecognised long options),
- add "passes information" to the verbose output of the main siscone
program,
- solve problems with the 'time' example.
SISCone version 1.1.1 (Mar 2007)
=====================
* The major upgrade is the use of pttilde (p-scheme pt) instead
of mt in the split--merge process. Indeed, we have noticed
that mt can lead to IR usafety in the case of two back-to-back
narrow-decay-width unstable particles (e.g. a pair of Higgs bosons).
See http://projects.hepforge.org/siscone/sm_issue.html for details.
Note that SISCone 1.1.1 allows the user to specify its choice for
the split-merge variable (we highly recommand the default choice)
* The number of passes is now set to infinity (0) by default
* Small minor changes in the 'siscone' command-line options
SISCone version 1.1.0 (Mar 2007)
=====================
* dealt with colinearity issues
* dealt with cocircularity situations (and related rounding errors)
* use mt instead of pt in the split-merge
pt lead to some IR unsafety for events with momentum conservation
* move all references to HEPForge
* Important note: some typos have been fixed. As a consequence, some
end-user members have been affected:
- The contents of the jets is accessed through 'Cjet::contents'
instead of 'Cjet::content'
- The function called to save the jet contents to disk is
'Csplit_merge::save_contents' instead of 'Csplit_merge::save_content'
Note that 'Csiscone::save_contents' is also valid.
SISCone version 1.0.0 (Jan 2007)
=====================
This is the first stable release of siscone.

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