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--- comphep:faq [01/01/2017 12:14] – [Q: What kind of OS do you support?] admin
+++ comphep:faq [31/10/2026 12:16] (current) – Update for CompHEP 4.6.2 dudko
@@ Line 3: / Line 3: @@
 ===== General questions =====
-==== Q: I would like to download CompHEP. How can I register? ====
+==== Q: I would like to download CompHEP. Do I need to register? ====
-It is a very simple procedure. You need a working email address only.
+No. Registration is not needed. Take the code from the [[:comphep:download:main|Downloads]] page.
-Fill the [[http://comphep.sinp.msu.ru/doku.php?id=downloads&do=register|form]] and enjoy the program.
 ==== Q: How to get an advice? ====
   * Read the FAQ page,
-  * Go to [[http://theory.sinp.msu.ru/mailman/listinfo/comphep-common|comphep-common]] mailing list.
+  * Check the [[https://gitverse.ru/comphep/comphep/content/master/doc/KNOWN-ISSUES.md|known issues]] and the [[https://gitverse.ru/comphep/comphep/content/master/CHANGELOG.md|changelog]].
   * Write a mail to CompHEP collaboration [[comphep@theory.sinp.msu.ru]]. Unfortunately the number of questions sometimes exceeds our abilities to reply promptly.
-==== Q: Why should I register on the CompHEP site? ====
-  - We would like to know how many people are using CompHEP and who are they. This information is important for further developments of the package for theoretical and phenomenological applications.
-  - The registration confirms that the user agrees with CompHEP Licence.
-The information about CompHEP users will not be transferred to a third party or exploited for any purposes without their permission.
 ==== Q: What kind of OS do you support? ====
-We cannot support all types of UNIX. Recently we prepared and tested CompHEP for several RedHat clones of Linux. Namely, they are Fedora Core 6/7 and Scientific Linux 3/4 (CERN). Old versions of CompHEP (e.g. 33.23, see the 'Downloads' page) could be installed on HP, SUN and DEC platforms.
+CompHEP 4.6 is built and tested on Linux. The [[:comphep:install|installation guide]] gives the commands for Debian/Ubuntu and Fedora/RHEL. CompHEP also builds on macOS and other UNIX-like systems, see the [[:comphep:new-mac|macOS notes]]. Old versions of CompHEP (e.g. 33.23, see the 'Downloads' page) could be installed on HP, SUN and DEC platforms.
-CompHEP (v 4.5 and later) has also been tested on Mac OS 10.4.X. More information is available on the page of [[:comphep:mac:welcome|MacOS community]].
+==== Q: Where can I find old versions? ====
-We do not support M$ Windows, but a very old version of CompHEP, compatible with M$ Windows, is still available (see below).
+The last release of each old branch is on the [[:comphep:download:main|Downloads]] page. Other old files are on the [[:comphep:archive|archive page]].
 ==== Q: Do you support M$ Windows? ====
-No. However, you can try to use old (not supported now) version CompHEP 3.3 from {{download:b76i.zip|here}}.
+No. However, you can try to use old (not supported now) version CompHEP 3.3 from {{:comphep:download:b76i.zip|here}}.
@@ Line 38: / Line 30: @@
 ===== Installation =====
-==== Problem with libg2c library on 64-bit Linux ====
+==== Q: How do I install CompHEP? ====
-The installation of some versions earlier than 4.4 on 64bit lxplus.cern.ch machines, where 32bit libisajet and libmath from cernlib are found by ./configure in the directory /cern/pro/lib may require the following steps:
+See the [[:comphep:install|installation guide]]. Notes for versions before 4.6 are at the end of this page.
-(0) make clean
+==== Q: CompHEP behaves strangely after I updated the sources ====
-(1) correction of CFLAGS: -Wall -DNUM_LONG -DCOMPHEP -m32 instead of -Wall -DNUM_LONG -DCOMPHEP
-(2) correction of CLIBS: -L/usr/X11R6/lib instead of -L/usr/X11R6/lib64
-then compile by 'make'. In versions 4.5 and later see the configure script options using ./configure --help. Configurations with gcc compiler version 4 (use gcc -dumpversion to see the version number) which does not support -lg2c, should use ./configure --with-gcc4
-==== Q: I am using 64-bit SUSE Linux. How to install CompHEP? ====
-Use CompHEP version for gcc-4 [[http://comphep.sinp.msu.ru/_media/download/comphep-4.4p3-gcc411.tgz]]. You must correct the file F77 with respect to the name of Fortran compiler in your system. For 64-bit SUSE Linux the correct name is gfortran-4.1.
- --- //Alexander Kryukov 08/06/2007 16:48//
-==== Q: FC5 installation problem: can not find g2c library ====
-To fix the problem add third line (see below) at the end of //configure// file by the following way:
-  echo $CC     > CC
-  echo $CFLAGS > CFLAGS
-  echo $CLIBS -L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/ > CLIBS
-==== Q: How to compile CompHEP in the D0 collaboration environment? ====
-For some unknown reasons one needs to unsetup D0 RunII environment before compiling CompHEP.
+Rebuild from a clean tree: ''make clean && make''.
 ===== CompHEP features =====
@@ Line 92: / Line 61: @@
-===== Known CompHEP probems =====
+===== Known CompHEP problems =====
+The current list is in the [[https://gitverse.ru/comphep/comphep/content/master/doc/KNOWN-ISSUES.md|known issues]] file.
@@ Line 102: / Line 73: @@
 ==== Q: Is it possible to calculate a process with 8 out-particles (and more)? ====
-By default, the parameter MAXINOUT is restricted to 10 (2in+8out particles). You can change this parameter (see the file src/include/model.h) and recompile CompHEP by 'make' command. However, we do not guarantee correct work of the program in this case. The diagrams generator does not support 2->8 images.
+By default, the parameter MAXINOUT is restricted to 10 (2in+8out particles). You can change this parameter (see the file src/service2/include/chep_limits.h) and recompile CompHEP by 'make' command. However, we do not guarantee correct work of the program in this case. The diagrams generator does not support 2->8 images.
 For decay processes the total number of particles should be strictly less then MAXINOUT value.
@@ Line 119: / Line 90: @@
 In your case some object with low effective mass is produced by protons s_hat=x_1 x_2 s, so the kinematic range for x is of the order of 10^{-7}. Pdf libraries are using some extrapolation based on available data at 10^{-3} to the region 10^{-7} and issue a warning on the reliability of the result. For detailed information you can address the
 authors of pdf.
-===== Problems with cpyth and formats of CompHEP event files =====
+===== Passing events to other generators =====
-==== Q: I have my favourite CompHEP model with new particles and I prepared an event sample with particles in the final state. How can I pass events to PYTHIA? ====
+==== Q: How can I pass CompHEP events to PYTHIA or HERWIG? ====
+CompHEP writes events in the Les Houches Event File format (LHEF), which shower generators read directly. Use a PYTHIA or HERWIG version that reads LHEF. The former interfaces and their notes are on the [[:comphep:archive|archive page]].
+===== Notes for old versions =====
+These notes apply to versions before 4.6.
+=== Problem with libg2c library on 64-bit Linux ===
+The installation of some versions earlier than 4.4 on 64bit lxplus.cern.ch machines, where 32bit libisajet and libmath from cernlib are found by ./configure in the directory /cern/pro/lib may require the following steps:
+(0) make clean
+(1) correction of CFLAGS: -Wall -DNUM_LONG -DCOMPHEP -m32 instead of -Wall -DNUM_LONG -DCOMPHEP
+(2) correction of CLIBS: -L/usr/X11R6/lib instead of -L/usr/X11R6/lib64
+then compile by 'make'. In versions 4.5 and later see the configure script options using ./configure --help. Configurations with gcc compiler version 4 (use gcc -dumpversion to see the version number) which does not support -lg2c, should use ./configure --with-gcc4
+=== Q: I am using 64-bit SUSE Linux. How to install CompHEP? ===
+Use CompHEP version for gcc-4 {{:comphep:download:comphep-4.4p3-gcc411.tgz}}. You must correct the file F77 with respect to the name of Fortran compiler in your system. For 64-bit SUSE Linux the correct name is gfortran-4.1.
+ --- //Alexander Kryukov 08/06/2007 16:48//
+=== Q: FC5 installation problem: can not find g2c library ===
+To fix the problem add third line (see below) at the end of //configure// file by the following way:
+  echo $CC     > CC
+  echo $CFLAGS > CFLAGS
+  echo $CLIBS -L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/ > CLIBS
+=== Q: How to compile CompHEP in the D0 collaboration environment? ===
+For some unknown reasons one needs to unsetup D0 RunII environment before compiling CompHEP.
-cpyth will stop if you try to pass the events through the default interface.
-PYTHIA should know the particle code of a new particle. So if a particle has the standard code, correct the routine kfpart in cpyth-*.*.*/src/comphep/kfcodes.c If a particle does not have the code, you can add an artificial number. But this will not work in all cases, if PYTHIA does not know the particle.