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diff --git a/Changes.md b/Changes.md
index 212bb7b..176f662 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,53 +1,54 @@
# Changelog
This is the log for changes to the HEJ program. Further changes to the HEJ API
are documented in `Changes-API.md`. If you are using HEJ as a library, please
also read the changes there.
## Version 2.X
### 2.X.0
* Resummation for W bosons with jets
- New subleading processes `extremal qqx` & `central qqx` for a quark and
anti-quark in the final state, e.g. `g g => u d_bar Wm g` (the other
subleading processes also work with W's)
- `HEJFOG` can generate mutliple jets together with a (off-shell) W bosons
decaying into lepton & neutrino
* Allow multiplication and division of multiple scale functions e.g.
`H_T/2*m_j1j2`
* Print cross sections at end of run
* Follow HepMC convention for particle Status codes: incoming = 11,
decaying = 2, outgoing = 1 (unchanged)
* Partons now have a Colour charge
- Colours are read from and written to LHE files
- For reweighted events the colours are created according to leading colour in
the FKL limit
* Allow changing the regulator lambda in input (`regulator parameter`, only for
advanced users)
* Use `git-lfs` for raw data in test (`make test` now requires `git-lfs`)
* Added support to read `hdf5` event files suggested in
[arXiv:1905.05120](https://arxiv.org/abs/1905.05120) (needs
[HighFive](https://github.com/BlueBrain/HighFive))
+* Support input with avarage weight equal to the cross section (`IDWTUP=1 or 4`)
## 2.0.5
* Fixed event classification for input not ordered in rapidity
### 2.0.4
* Fixed wrong path of `HEJ_INCLUDE_DIR` in `hej-config.cmake`
### 2.0.3
* Fixed parsing of (numerical factor) * (base scale) in configuration
* Don't change scale names, but sanitise Rivet output file names instead
### 2.0.2
* Changed scale names to `"_over_"` and `"_times_"` for proper file names (was
`"/"` and `"*"` before)
### 2.0.1
* Fixed name of fixed-order generator in error message.
diff --git a/src/bin/HEJ.cc b/src/bin/HEJ.cc
index b4f1a12..2472ff3 100644
--- a/src/bin/HEJ.cc
+++ b/src/bin/HEJ.cc
@@ -1,230 +1,250 @@
/**
* \authors The HEJ collaboration (see AUTHORS for details)
* \date 2019
* \copyright GPLv2 or later
*/
#include <array>
#include <chrono>
#include <iostream>
#include <limits>
#include <memory>
#include <numeric>
#include "yaml-cpp/yaml.h"
#include "fastjet/ClusterSequence.hh"
#include "HEJ/CombinedEventWriter.hh"
#include "HEJ/config.hh"
#include "HEJ/CrossSectionAccumulator.hh"
#include "HEJ/Event.hh"
#include "HEJ/EventReader.hh"
#include "HEJ/EventReweighter.hh"
#include "HEJ/get_analysis.hh"
#include "HEJ/make_RNG.hh"
+#include "HEJ/optional.hh"
#include "HEJ/ProgressBar.hh"
#include "HEJ/stream.hh"
#include "HEJ/Version.hh"
#include "HEJ/YAMLreader.hh"
-int event_number(std::string const & record){
+HEJ::optional<int> event_number(std::string const & record){
size_t start = record.rfind("Number of Events");
start = record.find_first_of("123456789", start);
if(start == std::string::npos) {
- throw std::invalid_argument("no event number record found");
+ return {};
}
const size_t end = record.find_first_not_of("0123456789", start);
return std::stoi(record.substr(start, end - start));
}
HEJ::Config load_config(char const * filename){
try{
return HEJ::load_config(filename);
}
catch(std::exception const & exc){
std::cerr << "Error: " << exc.what() << '\n';
std::exit(EXIT_FAILURE);
}
}
std::unique_ptr<HEJ::Analysis> get_analysis(
YAML::Node const & parameters
){
try{
return HEJ::get_analysis(parameters);
}
catch(std::exception const & exc){
std::cerr << "Failed to load analysis: " << exc.what() << '\n';
std::exit(EXIT_FAILURE);
}
}
// unique_ptr is a workaround:
// HEJ::optional is a better fit, but gives spurious errors with g++ 7.3.0
std::unique_ptr<HEJ::ProgressBar<double>> make_progress_bar(
std::vector<double> const & xs
) {
if(xs.empty()) return {};
const double Born_xs = std::accumulate(begin(xs), end(xs), 0.);
return std::make_unique<HEJ::ProgressBar<double>>(std::cout, Born_xs);
}
std::string time_to_string(const time_t time){
char s[30];
struct tm * p = localtime(&time);
strftime(s, 30, "%a %b %d %Y %H:%M:%S", p);
return s;
}
int main(int argn, char** argv) {
using clock = std::chrono::system_clock;
if (argn < 3) {
std::cerr << "\n# Usage:\n."<< argv[0] <<" config_file input_file\n\n";
return EXIT_FAILURE;
}
const auto start_time = clock::now();
{
std::cout << "Starting " << HEJ::Version::package_name_full()
<< ", revision " << HEJ::Version::revision() << " ("
<< time_to_string(clock::to_time_t(start_time)) << ")" << std::endl;
}
fastjet::ClusterSequence::print_banner();
// read configuration
const HEJ::Config config = load_config(argv[1]);
auto reader = HEJ::make_reader(argv[2]);
assert(reader);
std::unique_ptr<HEJ::Analysis> analysis = get_analysis(
config.analysis_parameters
);
assert(analysis != nullptr);
auto heprup{ reader->heprup() };
heprup.generators.emplace_back(LHEF::XMLTag{});
heprup.generators.back().name = HEJ::Version::package_name();
heprup.generators.back().version = HEJ::Version::String();
analysis->initialise(heprup);
HEJ::CombinedEventWriter writer{config.output, std::move(heprup)};
double global_reweight = 1.;
int max_events = std::numeric_limits<int>::max();
- if(argn > 3){
- max_events = std::stoi(argv[3]);
- const int input_events = event_number(reader->header());
- global_reweight = input_events/static_cast<double>(max_events);
- std::cout << "Processing " << max_events
- << " out of " << input_events << " events\n";
+ // if we need the event number:
+ if(std::abs(heprup.IDWTUP) == 4 || std::abs(heprup.IDWTUP) == 1 || argn > 3){
+ // try to read from LHE head
+ auto input_events{event_number(reader->header())};
+ if(!input_events) {
+ // else count manually
+ auto t_reader = HEJ::make_reader(argv[2]);
+ input_events = 0;
+ while(t_reader->read_event()) ++(*input_events);
+ }
+ if(std::abs(heprup.IDWTUP) == 4 || std::abs(heprup.IDWTUP) == 1){
+ // IDWTUP 4 or 1 assume average(weight)=xs, but we need sum(weights)=xs
+ std::cout << "Found IDWTUP " << heprup.IDWTUP << ": "
+ << "assuming \"cross section = average weight\".\n"
+ << "converting to \"cross section = sum of weights\" ";
+ global_reweight /= *input_events;
+ }
+ if(argn > 3){
+ // maximal number of events given
+ max_events = std::stoi(argv[3]);
+ global_reweight = *input_events/static_cast<double>(max_events);
+ std::cout << "Processing " << max_events
+ << " out of " << *input_events << " events\n";
+ }
}
+
HEJ::ScaleGenerator scale_gen{
config.scales.base,
config.scales.factors,
config.scales.max_ratio
};
auto ran = HEJ::make_RNG(config.rng.name, config.rng.seed);
assert(ran != nullptr);
HEJ::EventReweighter hej{
reader->heprup(),
std::move(scale_gen),
to_EventReweighterConfig(config),
*ran
};
// status infos & eye candy
int nevent = 0;
std::array<int, HEJ::event_type::last_type + 1>
nevent_type{0}, nfailed_type{0};
auto progress = make_progress_bar(reader->heprup().XSECUP);
HEJ::CrossSectionAccumulator xs;
std::map<HEJ::StatusCode, int> status_counter;
size_t total_trials = 0;
// Loop over the events in the input file
while(reader->read_event()){
// reweight events so that the total cross section is conserved
auto hepeup = reader->hepeup();
hepeup.setWeight(0, global_reweight * hepeup.weight());
if(nevent == max_events) break;
++nevent;
HEJ::Event::EventData event_data{hepeup};
event_data.reconstruct_intermediate();
// calculate HEJ weight
HEJ::Event FO_event{
std::move(event_data).cluster(
config.fixed_order_jets.def, config.fixed_order_jets.min_pt
)
};
if(FO_event.central().weight == 0) {
static const bool warned_once = [argv,nevent](){
std::cerr
<< "WARNING: event number " << nevent
<< " in " << argv[2] << " has zero weight. "
"Ignoring this and all further events with vanishing weight.\n";
return true;
}();
(void) warned_once; // shut up compiler warnings
continue;
}
auto resummed_events = hej.reweight(FO_event, config.trials);
for(auto const & s: hej.status())
++status_counter[s];
total_trials+=hej.status().size();
++nevent_type[FO_event.type()];
if(resummed_events.empty()) ++nfailed_type[FO_event.type()];
for(auto const & ev: resummed_events){
//TODO: move pass_cuts to after phase space point generation
if(analysis->pass_cuts(ev, FO_event)){
analysis->fill(ev, FO_event);
writer.write(ev);
xs.fill(ev);
}
}
if(progress) progress->increment(FO_event.central().weight);
} // main event loop
std::cout << '\n';
analysis->finalise();
using namespace HEJ::event_type;
std::cout<< "Events processed: " << nevent << '\n';
std::cout << '\t' << name(EventType::first_type) << ": "
<< nevent_type[EventType::first_type]
<< ", failed to reconstruct " << nfailed_type[EventType::first_type]
<< '\n';
for(auto i=EventType::first_type+1; i<=EventType::last_type; i*=2){
std::cout << '\t' << name(static_cast<EventType>(i)) << ": "
<< nevent_type[i]
<< ", failed to reconstruct " << nfailed_type[i]
<< '\n';
}
std::cout << '\n' << xs << '\n';
std::cout << "Generation statistic: "
<< status_counter[HEJ::StatusCode::good] << "/" << total_trials
<< " trials successful.\n";
for(auto && entry: status_counter){
const double fraction = static_cast<double>(entry.second)/total_trials;
const int percent = std::round(100*fraction);
std::cout << std::left << std::setw(17) << (to_string(entry.first) + ":")
<< " [";
for(int i = 0; i < percent/2; ++i) std::cout << '#';
for(int i = percent/2; i < 50; ++i) std::cout << ' ';
std::cout << "] " <<std::setw(2)<<std::right<< percent << "%\n";
}
std::chrono::duration<double> run_time = (clock::now() - start_time);
std::cout << "\nFinished " << HEJ::Version::package_name() << " at "
<< time_to_string(clock::to_time_t(clock::now()))
<< "\n=> Runtime: " << run_time.count() << " sec ("
<< nevent/run_time.count() << " Events/sec).\n";
}

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