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Search for Sphalerons: IceCube vs. LHC

Ellis, John; Sakurai, Kazuki; Spannowsky, Michael

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John Ellis

Kazuki Sakurai


We discuss the observability of neutrino-induced sphaleron transitions in the IceCube detector, encouraged by a recent paper by Tye and Wong (TW), which argued on the basis of a Bloch wave function in the periodic sphaleron potential that such transitions should be enhanced compared to most previous calculations. We calculate the dependence on neutrino energy of the sphaleron transition rate, comparing it to that for conventional neutrino interactions, and we discuss the observability of tau and multi-muon production in sphaleron-induced transitions. We use IceCube 4-year data to constrain the sphaleron rate, finding that it is comparable to the upper limit inferred previously from a recast of an ATLAS search for microscopic black holes at the LHC with ∼ 3/fb of collisions at 13 TeV. The IceCube constraint is stronger for a sphaleron barrier height ESph ≳ 9 TeV, and would be comparable with the prospective LHC sensitivity with 300/fb of data at 14 TeV if ESph ∼ 11 TeV.


Ellis, J., Sakurai, K., & Spannowsky, M. (2016). Search for Sphalerons: IceCube vs. LHC. Journal of High Energy Physics, 2016(05), Article 085.

Journal Article Type Article
Acceptance Date Apr 29, 2016
Online Publication Date May 13, 2016
Publication Date May 13, 2016
Deposit Date Nov 10, 2016
Publicly Available Date Mar 8, 2017
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 05
Article Number 085


Published Journal Article (875 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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