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Thoughts on Luminosity vs Energy Collider plots

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Lumi vs. Energy Plot from ITF Paper

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This plot appears as Figure 2 in the ITF paper

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It was made by Lian-Tao Wang from U. Chicago.

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Lumi vs. Energy Plot from ITF Paper

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This plot helps me (a non-HEP person) understand physics targets for future machines. . .

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. . . but it badly misrepresents how colliders are designed.

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Lumi vs. Energy Plot from ITF Paper

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A better version of this plot would show a “single” collider designed for fixed total power (site or beam) with its luminosity spectrum overlaid as well.

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Lumi vs. Energy Plot from ITF Paper

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Do we factor VBF into the lumi spectrum?

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How do we compare gamma-gamma vs. lepton-lepton?

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Lumi spectrum from BDS paper

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These are luminosity spectra for round and flat beam collisions at 15 TeV for e+e- collider from BDS Snowmass White Paper

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Superimpose spectrum on lumi v. energy plot

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Plot should show production of SM processes integrated over lumi spectrum

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But it should also display trade offs between different concepts