Abstract
The axino and the gravitino are well-motivated candidates for the lightest supersymmetric particle (LSP) and also for cold dark matter in the Universe. Assuming that a charged slepton is the next-to-lightest supersymmetric particle (NLSP), we show how the NLSP decays can be used to probe the axino LSP scenario in hadronic axion models as well as the gravitino LSP scenario at the Large Hadron Collider and the International Linear Collider. We show how one can identify experimentally the scenario realized in nature. In the case of the axino LSP, the NLSP decays will allow one to estimate the value of the axino mass and the Peccei–Quinn scale.
Highlights
In supersymmetric extensions of the Standard Model with unbroken R-parity [1], the lightest supersymmetric particle (LSP) is stable and plays an important role in both collider phenomenology and cosmology
II we investigate the next-to-lightest supersymmetric particle (NLSP) decays in the axino LSP scenario
We show that the NLSP decays can be used to estimate the axino mass and to probe the Peccei–Quinn sector
Summary
In supersymmetric extensions of the Standard Model with unbroken R-parity [1], the lightest supersymmetric particle (LSP) is stable and plays an important role in both collider phenomenology and cosmology. SUSY breaking schemes [17], the gravitino mass is typically less than 100 MeV, while in gravity-mediated schemes [1] it is expected to be in the GeV to TeV range Both the axino and the gravitino are singlets with respect to the gauge groups of the Standard Model. In both the axino LSP and the gravitino LSP cases, the next-to-lightest supersymmetric particle (NLSP) typically has a long lifetime. We will concentrate on the cases (i) and (ii) and call the LOSP the NLSP
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