Four-jet final state in same-sign lepton colliders and neutrinoless double beta decay mechanisms

C. H. Kom and W. Rodejohann

Phys. Rev. D 85, 015013 – Published 20 January 2012

Abstract

If neutrinoless double beta decay is observed, it will be important to understand the mechanism(s) behind this process. Using a minimal supersymmetric extension to the standard model in association with a lepton number violating coupling as an example, we show that if neutrinoless double beta decay is mediated by new TeV scale particles, looking for four-jet final states in future linear colliders operating in the same-sign electron mode could provide important information on the underlying mechanisms. We study the prospects for observing this process at the proposed ILC and CLIC energies, and discuss the complementarity between such a four-jet signal and other collider signatures at the LHC.

Received 20 October 2011

DOI:https://doi.org/10.1103/PhysRevD.85.015013

Authors & Affiliations

C. H. Kom^1,2 and W. Rodejohann³

¹Cavendish Laboratory, University of Cambridge, CB3 0HE, United Kingdom
²Department of Applied Mathematics and Theoretical Physics, University of Cambridge, CB3 0WA, United Kingdom
³Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029, Heidelberg, Germany

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Vol. 85, Iss. 1 — 1 January 2012

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Images

Figure 1
Example $0 ν β β$ Feynman diagrams for $λ^{'} MSSM$ . The initial (final) states are on the left (right) side of the diagrams. The arrows denote the flow of left chirality, and the dots represent mass insertions in the fermion propagators required by the chiral structure. The LNV vertices are labeled with $λ_{111}^{'}$ .Reuse & Permissions
Figure 2
Example 4j signal Feynman diagrams for $λ^{'} MSSM$ that correspond to the $0 ν β β$ diagrams displayed in Fig. 1. The initial (final) states are on the left (right) side of the diagrams. The arrows denote the flow of left chirality, and the dots represent mass insertions required by the chiral structure. The LNV vertices are labeled with $λ_{111}^{'}$ .Reuse & Permissions
Figure 3
Four-jet cross sections (fb) as functions of $(m_{{\tilde{χ}}^{0}}, m_{{\tilde{e}}_{L}})$ at 500 GeV (left) and 3 TeV (right) center-of-mass energy, assuming $0 ν β β$ is dominated by the $λ^{'} MSSM$ mechanism, and $T_{1 / 2} ({}^{76}{Ge}) = 1.9 \cdot 10^{25} yrs$ . Here the squark masses are set to 1000 TeV so that their contributions to both $0 ν β β$ and the 4j cross section are negligible. In both panels, selectrons can be pair-produced on-shell below the dot-dashed line labeled E(beam). The solid lines are branching fractions $B R ({\tilde{e}}_{L} \to j j)$ (from right to left) from 1 to 0.2 in steps of 0.2. In the region to the right of the dotted lines, approximately five or more events might be expected assuming an integrated luminosity of $500 {fb}^{- 1}$ .Reuse & Permissions
Figure 4
Four-jet cross sections (fb) as functions of $(m_{{\tilde{χ}}^{0}}, m_{{\tilde{e}}_{L}})$ at 500 GeV (left) and 3 TeV (right) center-of-mass energy, assuming $0 ν β β$ is dominated by the $λ^{'} MSSM$ mechanism, and $T_{1 / 2} ({}^{76}{Ge}) = 1 \cdot 10^{27} yrs$ . Here the squark masses are set to 1000 TeV so that their contributions to both $0 ν β β$ and the 4j cross section are negligible. In both panels, selectrons can be pair-produced on-shell below the dot-dashed line labeled E(beam). The solid lines are branching fractions $B R ({\tilde{e}}_{L} \to j j)$ (from right to left) from 1 to 0.2 in steps of 0.2. In the region to the right of the dotted lines, approximately five or more events might be expected assuming an integrated luminosity of $500 {fb}^{- 1}$ .Reuse & Permissions
Figure 5
Four-jet cross sections (fb) as functions of $(m_{\tilde{g}}, m_{\tilde{q}})$ at 500 GeV (left) and 3 TeV (right) center-of-mass energy, assuming $0 ν β β$ is dominated by the $λ^{'} MSSM$ mechanism, and $T_{1 / 2} ({}^{76}{Ge}) = 1.9 \cdot 10^{25} yrs$ . Here all squark masses are set to a common value $m_{\tilde{q}}$ . The slepton and neutralino masses are set to 1000 TeV so that their contributions to both $0 ν β β$ and the 4j cross section are negligible. The squark mass corresponding to $\sqrt{s} / 2$ and the boundary $m_{\tilde{g}} = m_{\tilde{q}}$ are displayed in dot-dashed and solid lines, respectively.Reuse & Permissions

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