# Large effects from small QCD instantons: making soft bombs at hadron colliders

@article{Khoze2020LargeEF, title={Large effects from small QCD instantons: making soft bombs at hadron colliders}, author={Valentin V. Khoze and F. Krauss and Matthias Schott}, journal={Journal of High Energy Physics}, year={2020}, volume={2020}, pages={1-29} }

It is a common belief that the last missing piece of the Standard Model of particles physics was found with the discovery of the Higgs boson at the Large Hadron Collider. However, there remains a major prediction of quantum tunnelling processes mediated by instanton solutions in the Yang-Mills theory, that is still untested in the Standard Model. The direct experimental observation of instanton-induced processes, which are a consequence of the non-trivial vacuum structure of the Standard Model… Expand

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#### References

SHOWING 1-10 OF 96 REFERENCES

Stefan

- Hoeche, F. Krauss, M. Schonherr, S. Schumann, F. Siegert, and J. Winter. Event generation with SHERPA 1.1. JHEP, 02:007
- 2009

Alexander M

- Polyakov, A. S. Schwartz, and Yu. S. Tyupkin. Pseudoparticle Solutions of the Yang-Mills Equations. Phys. Lett., B59:85–87
- 1975

Nonperturbative contribution to total cross-sections in non-Abelian gauge theories

- Phys. Lett., B259:106–112
- 1991

Computation of the quantum effects due to a four-dimensional pseudoparticle

- Physics
- 1976

A detailed quantitative calculation is carried out of the tunneling process described by the Belavin-Polyakov-Schwarz-Tyupkin field configuration. A certain chiral symmetry is violated as a… Expand

Leading power corrections to the semiclassical approximation for gauge meson collisions in the one-instanton sector☆

- Physics
- 1991

Abstract The leading quantum corrections for the 2 → n process involving vector particles in QCD and in the electroweak theory are calculated in the one-instanton sector. That is, all corrections of… Expand

Total cross section for anomalous fermion-number violation via dispersion relation

- Physics
- 1991

Abstract We investigate the behaviour of the total cross section for electroweak baryon and lepton number violation (in association with multi-W and multi-Higgs production) at low energies (√ s

Event Generation with Sherpa 2.2

- Physics, Computer Science
- 2019

Sherpa is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments. We summarize essential features and improvements of the Sherpa… Expand

On the phenomenology of sphaleron-induced processes at the LHC and beyond

- Physics
- 2019

We investigate the phenomenological aspects of non-perturbative baryon- and lepton-number-violating processes at hadron colliders. Such processes, induced by instanton/sphaleron configurations of the… Expand

Instanton liquid properties from lattice QCD

- Physics
- 2018

A bstractWe examined the instanton contribution to the QCD configurations generated from lattice QCD for NF = 0, NF = 2 + 1 and NF = 2 + 1 + 1 dynamical quark flavors from two different and… Expand

Limits on electroweak instanton-induced processes with multiple boson production

- Physics
- 2018

A bstractRecently, the CMS collaboration has reported their search for electroweak instanton-like processes with anomalous B + L violation assuming multi-fermion but zero-boson final states. On the… Expand