1 files changed, 57 insertions, 0 deletions

diff --git a/guix-science/packages/hep.scm b/guix-science/packages/hep.scm
index d6f9ca0..267a7e9 100644
--- a/guix-science/packages/hep.scm
+++ b/guix-science/packages/hep.scm
@@ -10,9 +10,11 @@
   #:use-module (gnu packages check)
   #:use-module (gnu packages cmake)
   #:use-module (gnu packages compression)
+  #:use-module (gnu packages cpp)
   #:use-module (gnu packages gcc)
   #:use-module (gnu packages graphviz)
   #:use-module (gnu packages maths)
+  #:use-module (gnu packages oneapi)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-build)
@@ -171,6 +173,61 @@ package.")
 
 (define-public clhep clhep-2.4.7.2)
 
+(define-public evtgen
+  (package
+    (name "evtgen")
+    (version "3.0.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://gitlab.cern.ch/evtgen/evtgen.git")
+             (commit "R03-00-01")))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "1093a46cqx8qzrqxpjw1icy6xkch0dk09h9nhhlhy9ff013340rb"))))
+    (build-system cmake-build-system)
+    (arguments
+     (list
+      #:configure-flags
+      #~(list "-DEVTGEN_HEPMC3:BOOL=ON"
+              "-DEVTGEN_PYTHIA:BOOL=ON"
+              "-DEVTGEN_PHOTOS:BOOL=ON"
+              "-DEVTGEN_TAUOLA:BOOL=ON"
+              "-DEVTGEN_SHERPA:BOOL=ON"
+              "-DEVTGEN_BUILD_TESTS:BOOL=ON")
+      #:phases
+      #~(modify-phases %standard-phases
+          ;; Requires install first.
+          (delete 'check)
+
+          (add-after 'install 'check
+            (lambda* (#:key tests? #:allow-other-keys)
+              (when tests?
+                (let ((here (string-append #$output "/share/EvtGen/test")))
+                  (with-directory-excursion here
+                    (invoke "./evtgenlhc_test1" "print" "100"
+                            "exampleFiles/GENERIC.DEC")))))))))
+    (inputs (list hepmc3
+                  photos
+                  pythia
+                  root
+                  sherpa
+                  tauola))
+    (native-inputs (list nlohmann-json onetbb))
+    (home-page "https://evtgen.hepforge.org/")
+    (synopsis
+     "Monte Carlo event generator for decays of heavy flavour particles")
+    (description
+     "EvtGen is a Monte Carlo event generator that simulates the decays of heavy
+flavour particles, primarily B and D mesons.  It contains a range of decay models
+for intermediate and final states containing scalar, vector and tensor mesons or
+resonances, as well as leptons, photons and baryons.  Decay amplitudes are used
+to generate each branch of a given full decay tree, taking into account angular
+and time-dependent correlations which allows for the simulation of CP-violating
+processes.")
+    (license license:gpl3+)))
+
 (define-public fastjet
   ;; Use this specific postfix commit for CMake. Should revert to regular
   ;; tagged releases from version 3.5.2 onwards.