Lamond, Frederic(k Archibald)

Parry, Tim

doi:10.1093/gmo/9781561592630.article.15909

Cited by 3 publications

(5 citation statements)

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“…However, these previous numerical estimates of the Higgs contributions to LFV τ and µ decays were done in the context of a generic MSSM (see also [18]), where the Higgs boson mass, or equivalently m 0 A , is an input parameter and can take small values of the order of 100 GeV which produces larger rates. A more recent study on the LFV Higgs decays has been done in [19] in the SUSY-GUT SU(5) context. We instead work here in the mSUGRA context where all the MSSM particle masses are quantities derived from the mSUGRA parameters.…”

Section: Introductionmentioning

confidence: 99%

Testing supersymmetry with lepton flavor violatingτandμdecays

2006

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In this work the following lepton flavor violating τ and µ decays are studied: τ − → µ − µ − µ + , τ − → e − e − e + , µ − → e − e − e + , τ − → µ − γ, τ − → e − γ and µ − → e − γ. We work in a supersymmetric scenario consisting of the minimal supersymmetric standard model particle content, extended by the addition of three heavy right handed Majorana neutrinos and their supersymmetric partners, and where the generation of neutrino masses is done via the seesaw mechanism. Within this context, a significant lepton flavor mixing is generated in the slepton sector due to the Yukawa neutrino couplings, which is transmited from the high to the low energies via the renormalization group equations. This slepton mixing then generates via loops of supersymmetric particles significant contributions to the rates of l j → 3l i and the correlated l j → l i γ decays. We analize here in full detail these rates in terms of the relevant input parameters, which are the usual minimal supergravity parameters and the seesaw parameters. For the l j → 3l i decays, a full one-loop analytical computation of all the contributing supersymmetric loops is presented. This completes and corrects previous computations in the literature. In the numerical analysis compatibility with the most recent experimental upper bounds on all these τ and µ decays, with the neutrino data, and with the present lower bounds on the supersymmetric particle masses are required. Two typical scenarios with degenerate and hierarchical heavy neutrinos are considered. We will show here that the minimal supergravity and seesaw parameters do get important restrictions from these τ and µ decays in the hierarchical neutrino case.

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Section: Introductionmentioning

confidence: 99%

Testing supersymmetry with lepton flavor violatingτandμdecays

2006

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“…Now we have a clear picture of the constraints to be imposed on the r q − σ q plane as listed in eq. (14)(15)(16)(17)(18)(19). In the following sections these constraints shall be used in a generic SUSY analysis of the mass insertion parameter space, followed by a study of the correlation of B q mixing and LFV rates in the minimal SUSY GUT.…”

Section: Constraints On the Susy Contribution To Bq Mixingmentioning

confidence: 99%

“…D∅) (1) ∆M s = 17.77 ± 0.10 ± 0.07 ps −1 (CDF) (2) The constraints from eq. (2) strongly restrict the allowed parameter space for the NP contribution to B s −B s mixing [8,9,10,11,12,13,14,15,16]. The first measurement of the CP phase associated with B s −B s mixing, φ s , was reported by the D∅ collaboration [3].…”

Section: Introductionmentioning

confidence: 99%

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mixing and lepton flavour violation in SUSY GUTs: Impact of the first measurements of

Parry

Zhang

2008

Nuclear Physics B

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In this work we re-examine the correlation between B 0 d,s −B 0 d,s mixing and Lepton Flavour Violation in the light of recent experimental measurements in the Bs system. We perform a generic SUSY analysis of the allowed down squark mass insertion parameter space. In the SUSY GUT scenario this parameter space is then used to make predictions for LFV branching ratios. We find that the recent measurement for the CP phase φs excludes the lowest rates for τ → µγ and provides a lower bound of ∼ 3 × 10 −9 for tan β = 10. Future experimental improvements in the bound on τ → µγ and the measurement of φs will constitute a strong test of the SUSY GUT scenario.

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“…[3,4,5,6,7], the authors carried out model-independent analysis of the constraints on extensions of the SM. There are also model-dependent calculations in some new physics models beyond the SM [8,9,10,11,12,13,14]. In this paper, we further investigate the effects of the minimal supersymmetric standard model with R-parity violation (MSSM-RPV) [15] on the neutral meson mixing.…”

Section: Introductionmentioning

confidence: 99%

New constraints onR-parity violating couplings through the measurements of theBs(d)0−
Xiangdong
¹
,
Li
²
,
Yang
³

2007
Phys. Rev. D
3
0
0
0
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We calculate contributions to B s −B s mixing through tree-level sneutrino exchange in the framework of the minimal supersymmetric standard model with R-parity violation, including the next-to-leading-order QCD corrections. We compare our results with the updated bounds on the B s −B s mass difference reported by CDF collaborations, and present new constraints on the relevant combinations of parameters of the minimal supersymmetric standard model with R-parity violation. Our results show that upper bound on the relevant combination of couplings of B s −B s mixing is of the order 10 −9 . We also calculate the B 0 d −B 0 d and K 0 −K 0 mass differences, and show that the upper bounds on the relevant combinations of couplings are two and four orders of magnitude stronger than ones reported in the literatures, respectively. We also discuss the case of complex couplings and show that how the relevant combinations of couplings are constrained by the updated experiment data of B s −B s , B d −B d mixing and time-dependent CP asymmetry S J/ψKs , and future possible observations of S J/ψφ at LHCb, respectively.

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Lamond, Frederic(k Archibald)

Cited by 3 publications

References 0 publications

Testing supersymmetry with lepton flavor violatingτandμdecays

Testing supersymmetry with lepton flavor violatingτandμdecays

mixing and lepton flavour violation in SUSY GUTs: Impact of the first measurements of

New constraints onR-parity violating couplings through the measurements of theBs(d)0−
Xiangdong
¹
,
Li
²
,
Yang
³

2007
Phys. Rev. D
3
0
0
0
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Lamond, Frederic(k Archibald)

Cited by 3 publications

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Testing supersymmetry with lepton flavor violatingτandμdecays

Testing supersymmetry with lepton flavor violatingτandμdecays

mixing and lepton flavour violation in SUSY GUTs: Impact of the first measurements of

New constraints onR-parity violating couplings through the measurements of theBs(d)0−Xiangdong1, Li2, Yang3 2007Phys. Rev. D3000View full textAdd to dashboardCite

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New constraints onR-parity violating couplings through the measurements of theBs(d)0−
Xiangdong
¹
,
Li
²
,
Yang
³

2007
Phys. Rev. D
3
0
0
0
View full text Add to dashboard Cite