CP violation in sbottom decays

Deppisch, Frank F.; Kittel, O.

doi:10.1007/jhep06(2010)067

Cited by 14 publications

(12 citation statements)

References 75 publications

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“…Projects that are currently in progress deal with the radiative production of neutralinos at the ILC [33], the measurement of SUSY CP phases at the LHC [34], the determination of chargino and neutralino properties at the ILC [35] as well as a complete cartography of the edge structures and spin measurements within the decay chains at the LHC [36]. Further projects deal with the implementation of extended GUT-or string-inspired supersymmetric models within WHIZARD to study their phenomenology [38].…”

Section: Supersymmetrymentioning

confidence: 99%

WHIZARD—simulating multi-particle processes at LHC and ILC

2011

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Abstract. We describe the universal Monte-Carlo (parton-level) event generator WHIZARD d , version 2. The program automatically computes complete tree-level matrix elements, integrates them over phase space, evaluates distributions of observables, and generates unweighted partonic event samples. These are showered and hadronized by calling external codes, either automatically from within the program or via standard interfaces. There is no conceptual limit on the process complexity; using current hardware, the program has successfully been applied to hard scattering processes with up to eight particles in the final state. Matrix elements are computed as helicity amplitudes, so spin and color correlations are retained. For event generation, processes can be concatenated with full spin correlation, so factorized approximations to cascade decays are possible when complete matrix elements are not desired. The Standard Model, the MSSM, and many alternative models such as Little Higgs, anomalous couplings, or effects of extra dimensions or noncommutative SM extensions have been implemented. Using standard interfaces to parton shower and hadronization programs, WHIZARD covers physics at hadron, lepton, and photon colliders.

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Section: Supersymmetrymentioning

confidence: 99%

WHIZARD—simulating multi-particle processes at LHC and ILC

2011

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“…refs. [49,85,[102][103][104]. Note that, unfortunately, complex phases are often neglected in publically available tools for calculating MSSM spectra, meaning that these areas of SUSY parameter space are not sufficiently explored.…”

Section: Jhep05(2013)053mentioning

confidence: 99%

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions

Bharucha

Fowler

Moortgat‐Pick

et al. 2013

J. High Energ. Phys.

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Abstract:We extend the formalism developed in ref. [53] for the renormalisation of the chargino-neutralino sector to the most general case of the MSSM with complex parameters. We show that products of imaginary parts arising from MSSM parameters and from absorptive parts of loop integrals can already contribute to predictions for physical observables at the one-loop level, and demonstrate that the consistent treatment of such contributions gives rise to non-trivial structure, either in the field renormalisation constants or the corrections associated with the external legs of the considered diagrams. We furthermore point out that the phases of the parameters in the chargino-neutralino sector do not need to be renormalised at the one-loop level, and demonstrate that the appropriate choice for the mass parameters used as input for the on-shell conditions depends both on the process and the region of MSSM parameter space under consideration. As an application, we compute the complete one-loop results in the MSSM with complex parameters for the process h a →χ + iχ − j (Higgs-propagator corrections have been incorporated up to the two-loop level), which may be of interest for SUSY Higgs searches at the LHC, and for chargino pair-production at an e + e − Linear Collider, e + e − →χ + iχ − j . We investigate the dependence of the theoretical predictions on the phases of the MSSM parameters, analysing in particular the numerical relevance of the absorptive parts of loop integrals.

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“…As shown in [15], the minimal luminosity L to observe a non-vanishing CP asymmetry A may be estimated by…”

Section: Application To Stop Cp Violation At the Lhcmentioning

confidence: 99%

CP violation in correlated production and decay of unstable particles

Kittel

Pilaftsis

2012

Nuclear Physics B

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We study resonant CP-violating Einstein-Podolsky-Rosen correlations that may take place in the production and decay of unstable scalar particles at high-energy colliders. We show that as a consequence of unitarity and CPT invariance of the S-matrix, in 2 → 2 scatterings mediated by mixed scalar particles, at least three linearly independent decay matrices associated with the unstable scalar states are needed to obtain non-zero CP-odd observables that are also odd under C-conjugation. Instead, for the correlated production and decay of two unstable particle systems in 2 → 4 processes, we find that only two independent decay matrices are sufficient to induce a net non-vanishing CP-violating phenomenon. As an application of this theorem, we present numerical estimates of CP asymmetries for the correlated production and decay of supersymmetric scalar top-antitop pairs at the LHC, and demonstrate that these could reach values of order one. As a byproduct of our analysis, we develop a novel spinorial trace technique, which enables us to efficiently evaluate lengthy expressions of squared amplitudes describing the resonant scalar transitions.

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CP violation in sbottom decays

Cited by 14 publications

References 75 publications

WHIZARD—simulating multi-particle processes at LHC and ILC

WHIZARD—simulating multi-particle processes at LHC and ILC

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions

CP violation in correlated production and decay of unstable particles

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