CalcHEP

more decimal point on the cross section

Asked by Hwidong Yoo

Dear experts,

I am using CalcHep to generate BSM events with LHE output (using the calchep_batch). In the output of LHE file, there is cross section information like

<crossSection unit="pb">0.000001</crossSection>

An issue is the precision of the cross section is not as high as I need and it would be great if I have more decimal point like 0.000001xxx for example. I wonder where I can handle in the program. Thanks in advance.

Regards,
Hwidong

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Alexander Pukhov (pukhov) said : 		#2

Sorry! I was sure we have replied.

It is rather easy. Please open file c_source/mix_events/event2lhe.c and at line 82 replace %f format on %E one.

<crossSection unit=\"pb\">%f</crossSection>\n",Finfo->cs); => <crossSection unit=\"pb\">%E</crossSection>\n",Finfo->cs);

The same about
event_mixer.c line 122
and
event_mixer.c line 231

Thank you for your note. I'll implement corresponding corrections in next oficial version.

Alexander Pukhov

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Alexander Belyaev (alexander.belyaev) said : 		#3

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