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<div style="direction: ltr; color: rgb(0, 0, 0);"><span style="font-family: Tahoma; font-size: 13.3333px;">Dear Rivet authors,</span>
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<div style="font-family: Tahoma; font-size: 13.3333px;">I am starting to use Rivet to analyze some hepmc files I generated using jewel, a heavy ion collision generator. Since protons and neutrons are both present in a heavy nuclei, I have beams of protons and
neutrons present in the hepmc event file. However, rivet detects the beam mismatch and gives the following error message and exits:</div>
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<div><span style="font-variant-ligatures: no-common-ligatures; background-color: rgb(255, 255, 255);"><font size="2">Event beams mismatch: [PROTON, NEUTRON] @ 5020 GeV vs. first beams [PROTON @ (2510; 0, 0, 2510) GeV, PROTON @ (2510; 0, 0, -2510) GeV] @ 5020
GeV</font></span></div>
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<div><font size="2"><span style="font-variant-ligatures: no-common-ligatures; background-color: rgb(255, 255, 255);">I couldn't find a way to successfully ask rivet to skip this beam check. Could you help me resolve this issue? I attached an analysis I will
extend to include jet substructure studies.</span></font></div>
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<div><font size="2"><span style="font-variant-ligatures: no-common-ligatures; background-color: rgb(255, 255, 255);">Thank a lot,</span></font></div>
<div><font size="2"><span style="font-variant-ligatures: no-common-ligatures; background-color: rgb(255, 255, 255);">Yang-Ting</span></font></div>
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<div style="font-family:Tahoma; font-size:13px">LHC Theory Initiative Fellow<br>
MIT Center for Theoretical Physics<br>
617-253-7194<br>
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