CP observables with spin–spin correlations in chargino production

Bartl, A.; Hohenwarter-Sodek, K.; Kernreiter, T.; Kittel, O.; Terwort, M.

doi:10.1016/j.nuclphysb.2008.04.031

Cited by 10 publications

(12 citation statements)

References 53 publications

(67 reference statements)

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“…In the MSSM such a phase stems from the µ parameter or the soft breaking terms and enters through tan β-enhanced loop factors. B → Dτ ν complements collider studies of these phases [34].…”

Section: Discussionmentioning

confidence: 70%

Charged-Higgs-boson effects in theB→Dτντdifferential decay distribution

2008

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We show that the decay mode B → Dτ ντ is competitive with and complementary to B → τ ντ in the search for charged-Higgs effects. Updating the relevant form factors, we find that the differential distribution in the decay chainB → Dντ τ − [→ π − ντ ] excellently discriminates between Standard-Model and charged-Higgs contributions. By measuring the D and π − energies and the angle between the D and π − three-momenta one can determine the effective charged-Higgs coupling including a possible CP-violating phase.

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Section: Discussionmentioning

confidence: 70%

Charged-Higgs-boson effects in theB→Dτντdifferential decay distribution

2008

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“…[11,21]. Typically their statistical significance is increased by ∼ 20% [11,18], compared to the asymmetries given in Eq. (20).…”

mentioning

confidence: 86%

“…Note that the neutralino and chargino decays will not yield additional CP-sensitive contributions, since these are twobody decays via scalar particles. The T-odd spin-spin correlation term f is analogous to the corresponding term in neutralino [11] or chargino [18] pair production at the ILC, since all these processes have the same kinematical structure.…”

Section: T-odd Observablesmentioning

confidence: 99%

“…In that respect, T-odd and CP-odd asymmetries based on triple or epsilon products have been proposed [8]. For the ILC [9], triple product asymmetries have been intensively studied in the production and decay of neutralinos [10][11][12][13][14][15][16] and charginos [16][17][18][19][20], also using transversely polarized beams [21,22]. At the LHC [23,24], triple product asymmetries have been studied for the decays of stops [5,[26][27][28][29], sbottoms [30], staus [31], and neutralinos which originate from squark decays [32,33].…”

Section: Introductionmentioning

confidence: 99%

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CP asymmetries in the supersymmetric trilepton signal at the LHC

Bornhauser

Drees²,

Dreiner³

et al. 2012

Eur. Phys. J. C

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In the CP-violating Minimal Supersymmetric Standard Model, we study the production of a neutralino-chargino pair at the LHC. For their decays into three leptons, we analyze CP asymmetries which are sensitive to the CP phases of the neutralino and chargino sector. We present analytical formulas for the entire production and decay process, and identify the CP-violating contributions in the spin correlation terms. This allows us to define the optimal CP asymmetries. We present a detailed numerical analysis of the cross sections, branching ratios, and the CP observables. For light neutralinos, charginos, and squarks, the asymmetries can reach several 10%. We estimate the discovery potential for the LHC to observe CP violation in the trilepton channel.

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“…Some previous studies of CP violation involving charginos may be found in Refs. [3,4,5,6,7,8,9,10,11].…”

mentioning

confidence: 99%

CPviolation in three-body chargino decays

et al. 2009

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CP violation in supersymmetry can give rise to rate asymmetries in the decays of supersymmetric particles. In this work we compute the rate asymmetries for the three-bodyEach of the decays contains contributions mediated by neutral Higgs bosons that can possibly go on shell. Such contributions receive a resonant enhancement; furthermore, the strong phases required for the CP asymmetries come from the widths of the exchanged Higgs bosons. Our results indicate that the rate asymmetries can be relatively large in some cases, while still respecting a number of important low-energy bounds such as those coming from B meson observables and electric dipole moments. For the parameters that we consider, rate asymmetries of order 10% are possible in some cases.

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CP observables with spin–spin correlations in chargino production

Cited by 10 publications

References 53 publications

Charged-Higgs-boson effects in theB→Dτντdifferential decay distribution

Charged-Higgs-boson effects in theB→Dτντdifferential decay distribution

CP asymmetries in the supersymmetric trilepton signal at the LHC

CPviolation in three-body chargino decays

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