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High Energy, Nuclear, Particle Physics
Particle Creation function of beam energy
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[QUOTE="mfb, post: 6367638, member: 405866"] In electron-positron colliders there can be an ideal energy. [list][*]For the Z that's simply the Z mass. [*]For ZH the ideal energy is about 270 GeV. Lower and the phase space is very small (both particles need to be nearly at rest relative to each other), higher and other processes are more likely. [url=https://cds.cern.ch/record/1605366/files/Chapter_Theory_figs_higgs_xsec_P-08_02_1TeV.png]Here is a plot[/url]. [*]For B mesons the ideal energy is the ##\Upsilon(4s)## resonance, which usually decays to pairs of B mesons. You might get more again at very high energy, but at least it's a strong local maximum.[/list] For hadron colliders more is better - outside the low-energy region all the reactions get more likely with more energy. [/QUOTE]
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High Energy, Nuclear, Particle Physics
Particle Creation function of beam energy
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