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Search for sphalerons in proton-proton collisions

Ellis, John; Sakurai, Kazuki

Search for sphalerons in proton-proton collisions Thumbnail


John Ellis

Kazuki Sakurai


In a recent paper, Tye and Wong (TW) have argued that sphaleron-induced transitions in high-energy proton-proton collisions should be enhanced compared to previous calculations, based on a construction of a Bloch wave function in the periodic sphaleron potential and the corresponding pass band structure. Here we convolute the calculations of TW with parton distribution functions and simulations of final states to explore the signatures of sphaleron transitions at the LHC and possible future colliders. We calculate the increase of sphaleron transition rates in proton-proton collisions at centre-of-mass energies of 13/14/33/100TeV for different sphaleron barrier heights, while recognising that the rates have large overall uncertainties. We use a simulation to show that LHC searches for microscopic black holes should have good efficiency for detecting sphaleron-induced final states, and discuss their experimental signatures and observability in Run 2 of the LHC and beyond. We recast the early ATLAS Run-2 search for microscopic black holes to constrain the rate of sphaleron transitions at 13TeV, deriving a significant limit on the sphaleron transition rate for the nominal sphaleron barrier height of 9TeV.


Ellis, J., & Sakurai, K. (2016). Search for sphalerons in proton-proton collisions. Journal of High Energy Physics, 2016(4), Article 86.

Journal Article Type Article
Acceptance Date Mar 30, 2016
Online Publication Date Apr 14, 2016
Publication Date Apr 30, 2016
Deposit Date Apr 1, 2019
Publicly Available Date Apr 2, 2019
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2016
Issue 4
Article Number 86


Published Journal Article (892 Kb)

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Copyright Statement
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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