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Advanced Topics in Quantum Field Theory by M. Shifman

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23 Instantons at high energies

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In our search for baryon number violations that could be tested in laboratories it is natural to pose the following question. Can high energies play the same role as a heat bath in facilitating Δ ≠ 0 jumps? In other words, can baryon-number-violating transitions occur in collisions of energetic particles at energies EMsph with an unsuppressed (or, at least, a less suppressed) rate?

To answer this question we need to find out how to calculate, or at least estimate, instanton-induced cross sections at high energies. ...

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