10.1007/JHEP06(2015)041">
 

Document Type

Article

Publication Date

6-5-2015

Abstract

In supersymmetric (SUSY) theories with extra dimensions the visible energy in sparticle decays can be significantly reduced and its energy distribution broadened, thus significantly weakening the present collider limits on SUSY. The mechanism applies when the lightest supersymmetric particle (LSP) is a bulk state — e.g. a bulk modulino, axino, or gravitino — the size of the extra dimensions ≳ 10−14 cm, and for a broad variety of visible sparticle spectra. In such cases the lightest ordinary supersymmetric particle (LOSP), necessarily a brane-localised state, decays to the Kaluza-Klein (KK) discretuum of the LSP. This dynamically realises the compression mechanism for hiding SUSY as decays into the more numerous heavier KK LSP states are favored. We find LHC limits on right-handed slepton LOSPs evaporate, while LHC limits on stop LOSPs weaken to ∼ 350 ÷ 410 GeV compared to ∼ 700 GeV for a stop decaying to a massless LSP. Similarly, for the searches we consider, present limits on direct production of degenerate first and second generation squarks drop to ∼ 450 GeV compared to ∼ 800 GeV for a squark decaying to a massless LSP. Auto-concealment typically works for a fundamental gravitational scale of M * ∼ 10 ÷ 100 TeV, a scale sufficiently high that traditional searches for signatures of extra dimensions are mostly avoided. If superpartners are discovered, their prompt, displaced, or stopped decays can also provide new search opportunities for extra dimensions with the potential to reach M * ∼ 109 GeV. This mechanism applies more generally than just SUSY theories, pertaining to any theory where there is a discrete quantum number shared by both brane and bulk sectors.

Comments

Article open access funded by SCOAP3.

© 2015 The Authors. 

This article is published by Springer, licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 

 Sourced from the published version of record cited below.

The work appeared on the arXiv repository at  1412.0805

Co-author K. Howe was co-affiliated with the SLAC National Accelerator Laboratory at the time of this article.

Co-authors J. March-Russell and J. Scoville were co-affiliated with the Rudolf Peierls Centre for Theoretical Physics, University of Oxford

Source Publication

Journal of High Energy Physics (ISSN 1126-6708 | eISSN 1029-8479)

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