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

Abstract

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 electroweak gauge fields, are believed to play a crucial role in the generation of baryon asymmetry in the early Universe at finite temperature. On the other hand, at colliders (that represent the zero-temperature high-energy regime) the rate and observability of such processes are still under debate. Motivated by current theoretical considerations, we construct a modern event generator within the general-purpose Herwig Monte Carlo framework, that aims to capture the most relevant features of the dominant processes. We perform a detailed phenomenological analysis focussing on the Large Hadron Collider, at 13 TeV proton-proton centre-of-mass energy, a potential high-energy upgrade at 27 TeV and the proposed Future Circular Collider (FCC-hh) at 100 TeV. We derive constraints on the expected rates for various parametrisations of our model. We find that all three colliders are capable of providing meaningful information on the nature of instanton/sphaleron-induced processes at various energy scales.

23 pages, 12 figures

References in corpus (7)

• Herwig++ Physics and Manual
• BlackMax: A black-hole event generator with rotation, recoil, split branes and brane tension
• CT10 parton distributions and other developments in the global QCD analysis
• Doubling Up on Supersymmetry in the Higgs Sector
• Baryon Number Violating Scatterings in Laboratories
• On the phenomenology of sphaleron-induced processes at the LHC and beyond
• Does a band structure affect sphaleron processes?

Cited by in corpus (10)

• High Energy Sphalerons for Baryogenesis at Low Temperatures
• On the phenomenology of sphaleron-induced processes at the LHC and beyond
• Large Effects from Small QCD Instantons: Making Soft Bombs at Hadron Colliders
• Walls, bubbles and doom -- the cosmology of HEFT
• Searching for QCD Instantons at Hadron Colliders
• Double and multiple bangs at tau neutrino telescopes: A novel probe of sphalerons with cosmogenic neutrinos
• Creating kinks with quantum mediation
• Machine Learning Classification of Sphalerons and Black Holes at the LHC
• On the Modelling of Energetic Multi-jet QCD Events
• Search for the baryon number and lepton number violating decays ${\tau }^{-}\to \Lambda {\pi }^{-}$ and ${\tau }^{-}\to \bar{\Lambda }{\pi }^{-}$ at Belle II