Commit 4b3d5838 authored by Jürgen Reuter's avatar Jürgen Reuter
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Metadata 2.8.3/3.0.0alpha

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......@@ -506,7 +506,9 @@ model with the help of external programs like <span style="font-family:monospace
<span style="font-family:monospace">FeynRules</span> program or the Universal Feynrules Output, UFO, and
include it into the <span style="font-family:monospace">WHIZARD</span> event generator.</p><p>In the appendices, we e.g. give an exhaustive reference list of
<span style="font-family:monospace">SINDARIN</span> commands and built-in variables.</p><p>Please report any inconsistencies, bugs, problems or simply pose open
questions to our contact <a href="whizard@desy.de"><span style="font-family:monospace">whizard@desy.de</span></a>.</p>
questions to our contact <a href="whizard@desy.de"><span style="font-family:monospace">whizard@desy.de</span></a>.</p><p>There is now also a support page on <span style="font-family:monospace">Launchpad</span>, which offers
support that is easily visible for the whole user community:
<a href="https://launchpad.net/whizard"><span style="font-family:monospace">https://launchpad.net/whizard</span></a>.</p>
<!--TOC section id="sec5" 1.3  Historical remarks-->
<h2 id="sec5" class="section">1.3  Historical remarks</h2><!--SEC END --><p>This section gives a historical overview over the development of
<span style="font-family:monospace">WHIZARD</span> and can be easily skipped in a (first) reading of the
......@@ -552,7 +554,8 @@ program internals but keeping (almost everywhere) the same user
interface. New features are inclusive processes, reweighting, and more
interfaces for QCD environments (BLHA/HOPPET).</p><p>The following tables shows some of the major steps (physics
implementation and/or technical improvements) in the development
of <span style="font-family:monospace">WHIZARD</span>:</p><div class="center">
of <span style="font-family:monospace">WHIZARD</span>(we break the table into logical and temporal blocks of
<span style="font-family:monospace">WHIZARD</span> development):</p><div class="center">
<table border=1 style="border-spacing:0;" class="cellpadding1"><tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 0.99</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/1999</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Beta version </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.00</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >12/2000</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >First public version </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.10</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >03/2001</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Libraries; <span style="font-family:monospace">PYTHIA6</span> interface </td></tr>
......@@ -574,7 +577,9 @@ functions </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.95</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >MLM matching; development stop in version 1
</td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.97</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >05/2011</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Manual for version 1 completed. </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >2.0.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >04/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Major refactoring: automake setup; dynamic
</table>
</div><div class="center">
<table border=1 style="border-spacing:0;" class="cellpadding1"><tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.0.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >04/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Major refactoring: automake setup; dynamic
libraries </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >improved speed; cascades; OpenMP; <span style="font-family:monospace">SINDARIN</span> steering language </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.0.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >QCD ISR+FSR shower; polarized beams </td></tr>
......@@ -590,16 +595,19 @@ processes </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.2</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2014</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >LHAPDF6 support; correlated LC beams; GuineaPig
interface </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >11/2014</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >O’Mega virtual machine; lepton collider top
pair threshold; Higgs singlet extension </td></tr>
pair threshold; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Higgs singlet extension </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.4</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >LCIO support; progress on NLO; many technical
bug fixes </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.7</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >progress on POWHEG; fixed-order NLO events;
revalidation of ILC event chain </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.8</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >11/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >support for quadruple precision; StdHEP included;
SM dim 6 operators supported
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.7</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >progress on POWHEG; fixed-order NLO events; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >revalidation of ILC event chain </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.8</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >11/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >support for quadruple precision; StdHEP included; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >SM dim 6 operators supported
</td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.3.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2016</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >NLO: resonance mappings for FKS subtraction; more
advanced cascade syntax; </td></tr>
</table>
</div><div class="center">
<table border=1 style="border-spacing:0;" class="cellpadding1"><tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.3.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2016</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >NLO: resonance mappings for FKS subtraction; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >more advanced cascade syntax; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >GUI (α version); UFO support
(α version); ILC v1.9x-v2.x final validation </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.3.1</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2016</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Complex mass scheme
......@@ -616,8 +624,8 @@ resonance histories </td></tr>
shower resonances; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >more efficient (alternative) phase space generation </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.2</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >12/2017</td><td style="text-align:left;border:solid 1px;white-space:nowrap" ><span style="font-style:italic">Hee</span> coupling, improved resonance matching </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2018</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Partial NLO refactoring for quantum numbers,
unified RECOLA 1/2 interface. </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2018</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Partial NLO refactoring for quantum numbers, </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >unified RECOLA 1/2 interface. </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.4</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2018</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Gridpack functionality; Bug fixes: color flows,
HSExt model, MPI setup
</td></tr>
......@@ -630,7 +638,9 @@ structures, n-point vertices </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.8.1</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >09/2019</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >HepMC3, NLO QCD pp (almost)
complete, b/c jet selection, photon isolation </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.8.2</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >10/2019</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Support for OCaml ≥ 4.06.0, UFO Spin-2 support,
LCIO alternative weights
LCIO alternative weights </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.8.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2020</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >UFO Majorana feature complete, many <span style="font-style:italic">e</span><sup>+</sup><span style="font-style:italic">e</span><sup>−</sup> related
improvements
</td></tr>
</table>
</div><p><br>
......@@ -4220,18 +4230,40 @@ visible if the cuts permit the photon to be almost on-shell.</p><p>An alternativ
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:fudged_width"</span></code><span style="font-size:small">
</span>
</span>,
</blockquote><p>
which puts zero width in the matrix element, so that gauge cancellations
hold, and reinstates the <span style="font-style:italic">s</span>-channel width in the appropriate places by an
overall factor that multiplies the whole matrix element.</p><p>Another possibility is
overall factor that multiplies the whole matrix element.
Note that the fudged width option only applies to charged unstable particles, such as the <span style="font-style:italic">W</span> boson or top quark.
Another possibility is
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:constant_width"</span></code><span style="font-size:small">
</span>
</span>,
</blockquote><p>
which puts the width both in the <span style="font-style:italic">s</span>- and in the <span style="font-style:italic">t</span>-channel like diagrams.
A third option is provided by the running width scheme
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:running_width"</span></code><span style="font-size:small">
</span>,
</blockquote><p>
which puts the width both in the <span style="font-style:italic">s</span> and in the <span style="font-style:italic">t</span> channel everywhere.</p><p>Note that both options apply only to charged unstable particles, such as the
<span style="font-style:italic">W</span> boson.</p>
which applies the width only for <span style="font-style:italic">s</span>-channel like diagrams and multiplies it by a factor of <span style="font-style:italic">p</span><sup>2</sup> / <span style="font-style:italic">M</span><sup>2</sup>.
The additional <span style="font-style:italic">p</span><sup>2</sup>-dependent factor mimicks the momentum dependence of the imaginary part of a vacuum polarization for a particle decaying into massles decay products.
It is noted that none of the above options preserves gauge invariance.</p><p>For a gauge preserving approach (at least at tree level), <span style="font-family:monospace">O’Mega</span> provides the complex-mass scheme
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:cms_width</span></code><span style="font-size:small">
</span>.
</blockquote><p>
However, in this case, one also has to modify the model in usage.
For example, the parameter setting for the Standard Model can be changed by,
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">model = SM (Complex_Mass_Scheme)</span></code><span style="font-size:small">
</span>.
</blockquote>
<!--TOC subsubsection id="sec141" Multithreaded calculation of helicity sums via OpenMP-->
<h4 id="sec141" class="subsubsection">Multithreaded calculation of helicity sums via OpenMP</h4><!--SEC END --><p>
<a id="sec:openmp"></a></p><p>On multicore and / or multiprocessor systems, it is possible to speed
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  • 2-up
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......@@ -115,7 +115,9 @@ model with the help of external programs like <span style="font-family:monospace
<span style="font-family:monospace">FeynRules</span> program or the Universal Feynrules Output, UFO, and
include it into the <span style="font-family:monospace">WHIZARD</span> event generator.</p><p>In the appendices, we e.g. give an exhaustive reference list of
<span style="font-family:monospace">SINDARIN</span> commands and built-in variables.</p><p>Please report any inconsistencies, bugs, problems or simply pose open
questions to our contact <a href="whizard@desy.de"><span style="font-family:monospace">whizard@desy.de</span></a>.</p>
questions to our contact <a href="whizard@desy.de"><span style="font-family:monospace">whizard@desy.de</span></a>.</p><p>There is now also a support page on <span style="font-family:monospace">Launchpad</span>, which offers
support that is easily visible for the whole user community:
<a href="https://launchpad.net/whizard"><span style="font-family:monospace">https://launchpad.net/whizard</span></a>.</p>
<h2 id="sec5" class="section">1.3  Historical remarks</h2>
<p>This section gives a historical overview over the development of
<span style="font-family:monospace">WHIZARD</span> and can be easily skipped in a (first) reading of the
......@@ -161,7 +163,8 @@ program internals but keeping (almost everywhere) the same user
interface. New features are inclusive processes, reweighting, and more
interfaces for QCD environments (BLHA/HOPPET).</p><p>The following tables shows some of the major steps (physics
implementation and/or technical improvements) in the development
of <span style="font-family:monospace">WHIZARD</span>:</p><div class="center">
of <span style="font-family:monospace">WHIZARD</span>(we break the table into logical and temporal blocks of
<span style="font-family:monospace">WHIZARD</span> development):</p><div class="center">
<table border=1 style="border-spacing:0;" class="cellpadding1"><tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 0.99</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/1999</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Beta version </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.00</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >12/2000</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >First public version </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.10</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >03/2001</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Libraries; <span style="font-family:monospace">PYTHIA6</span> interface </td></tr>
......@@ -183,7 +186,9 @@ functions </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.95</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >MLM matching; development stop in version 1
</td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 1.97</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >05/2011</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Manual for version 1 completed. </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >2.0.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >04/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Major refactoring: automake setup; dynamic
</table>
</div><div class="center">
<table border=1 style="border-spacing:0;" class="cellpadding1"><tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.0.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >04/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Major refactoring: automake setup; dynamic
libraries </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >improved speed; cascades; OpenMP; <span style="font-family:monospace">SINDARIN</span> steering language </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.0.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2010</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >QCD ISR+FSR shower; polarized beams </td></tr>
......@@ -199,16 +204,19 @@ processes </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.2</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2014</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >LHAPDF6 support; correlated LC beams; GuineaPig
interface </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >11/2014</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >O’Mega virtual machine; lepton collider top
pair threshold; Higgs singlet extension </td></tr>
pair threshold; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Higgs singlet extension </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.4</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >LCIO support; progress on NLO; many technical
bug fixes </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.7</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >progress on POWHEG; fixed-order NLO events;
revalidation of ILC event chain </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.8</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >11/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >support for quadruple precision; StdHEP included;
SM dim 6 operators supported
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.7</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >progress on POWHEG; fixed-order NLO events; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >revalidation of ILC event chain </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.2.8</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >11/2015</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >support for quadruple precision; StdHEP included; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >SM dim 6 operators supported
</td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.3.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2016</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >NLO: resonance mappings for FKS subtraction; more
advanced cascade syntax; </td></tr>
</table>
</div><div class="center">
<table border=1 style="border-spacing:0;" class="cellpadding1"><tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.3.0</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2016</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >NLO: resonance mappings for FKS subtraction; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >more advanced cascade syntax; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >GUI (α version); UFO support
(α version); ILC v1.9x-v2.x final validation </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.3.1</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2016</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Complex mass scheme
......@@ -225,8 +233,8 @@ resonance histories </td></tr>
shower resonances; </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >more efficient (alternative) phase space generation </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.2</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >12/2017</td><td style="text-align:left;border:solid 1px;white-space:nowrap" ><span style="font-style:italic">Hee</span> coupling, improved resonance matching </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2018</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Partial NLO refactoring for quantum numbers,
unified RECOLA 1/2 interface. </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >02/2018</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Partial NLO refactoring for quantum numbers, </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >&nbsp;</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >unified RECOLA 1/2 interface. </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.6.4</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >08/2018</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Gridpack functionality; Bug fixes: color flows,
HSExt model, MPI setup
</td></tr>
......@@ -239,7 +247,9 @@ structures, n-point vertices </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.8.1</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >09/2019</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >HepMC3, NLO QCD pp (almost)
complete, b/c jet selection, photon isolation </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.8.2</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >10/2019</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >Support for OCaml ≥ 4.06.0, UFO Spin-2 support,
LCIO alternative weights
LCIO alternative weights </td></tr>
<tr><td style="text-align:left;border:solid 1px;white-space:nowrap" > 2.8.3</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >07/2020</td><td style="text-align:left;border:solid 1px;white-space:nowrap" >UFO Majorana feature complete, many <span style="font-style:italic">e</span><sup>+</sup><span style="font-style:italic">e</span><sup></sup> related
improvements
</td></tr>
</table>
</div><p><br>
......
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......@@ -1135,18 +1135,40 @@ visible if the cuts permit the photon to be almost on-shell.</p><p>An alternativ
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:fudged_width"</span></code><span style="font-size:small">
</span>
</span>,
</blockquote><p>
which puts zero width in the matrix element, so that gauge cancellations
hold, and reinstates the <span style="font-style:italic">s</span>-channel width in the appropriate places by an
overall factor that multiplies the whole matrix element.</p><p>Another possibility is
overall factor that multiplies the whole matrix element.
Note that the fudged width option only applies to charged unstable particles, such as the <span style="font-style:italic">W</span> boson or top quark.
Another possibility is
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:constant_width"</span></code><span style="font-size:small">
</span>
</span>,
</blockquote><p>
which puts the width both in the <span style="font-style:italic">s</span>- and in the <span style="font-style:italic">t</span>-channel like diagrams.
A third option is provided by the running width scheme
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:running_width"</span></code><span style="font-size:small">
</span>,
</blockquote><p>
which puts the width both in the <span style="font-style:italic">s</span> and in the <span style="font-style:italic">t</span> channel everywhere.</p><p>Note that both options apply only to charged unstable particles, such as the
<span style="font-style:italic">W</span> boson.</p>
which applies the width only for <span style="font-style:italic">s</span>-channel like diagrams and multiplies it by a factor of <span style="font-style:italic">p</span><sup>2</sup> / <span style="font-style:italic">M</span><sup>2</sup>.
The additional <span style="font-style:italic">p</span><sup>2</sup>-dependent factor mimicks the momentum dependence of the imaginary part of a vacuum polarization for a particle decaying into massles decay products.
It is noted that none of the above options preserves gauge invariance.</p><p>For a gauge preserving approach (at least at tree level), <span style="font-family:monospace">O’Mega</span> provides the complex-mass scheme
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">$omega_flags = "-model:cms_width</span></code><span style="font-size:small">
</span>.
</blockquote><p>
However, in this case, one also has to modify the model in usage.
For example, the parameter setting for the Standard Model can be changed by,
</p><blockquote class="quote">
<span style="font-size:small">
</span><code><span style="font-size:small">model = SM (Complex_Mass_Scheme)</span></code><span style="font-size:small">
</span>.
</blockquote>
<h4 id="sec141" class="subsubsection">Multithreaded calculation of helicity sums via OpenMP</h4>
<p>
<a id="sec:openmp"></a></p><p>On multicore and / or multiprocessor systems, it is possible to speed
......
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