A novel approach to confront electroweak data and theory

Hagiwara, Kaoru; Haidt, D.; Kim, C. S.; Matsumoto, Sh.

doi:10.1007/bf01566682

Cited by 63 publications

(88 citation statements)

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“…The F Gf R formula are obtained from the corresponding F Gf L expressions by replacing a Xi ↔ b Xi and v L ↔ v R . C f X 0 and C f X αβ are the Passarino and Veltman [27] C functions in the convention of [28]. The arguments of the C function are C f X 0(αβ) = C 0(αβ) (p 2 j , p 2 i , s, m 2 f , m 2…”

Section: Appendix B: Quark and Squark Loop Functionsmentioning

confidence: 99%

Radiative corrections to a supersymmetric relation: A new approach

et al. 1998

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Recently it has been realized that the production and decay processes of charginos, neutralinos, and sleptons receive corrections which grow like log mq for large mq. In this paper we calculate the chargino pair production cross section at e + e − colliders with quark/squark loop corrections. We introduce a novel formulation, where the one-loop amplitude is reorganized into two parts. One part is expressed in terms of the "effective" chargino couplinḡ g eν W and mixing matrices U P , V P , and includes all O(log mq) corrections, while the other decouples for large mq. The form of the one-loop cross section then becomes physically transparent. Our formulation can be easily extended to other loops and processes. Numerically, we find significant corrections due to the effective t-channel couplingḡ eν W , for gaugino-like charginos. In the mixed region, where the chargino has large gaugino and Higgsino components, the corrections due to (U P , V P ) are also significant. Our numerical results disagree with a previous calculation. We revisit previous studies of the determination ofḡ eν W through the measurement of the chargino production cross section. We point out that a previous study, which claimed that the measurement suffers large systematic errors, was performed at a "pessimistic" point in MSSM parameter space. We provide reasons why the systematic errors are not a limiting factor for generic parameter choices.

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Section: Appendix B: Quark and Squark Loop Functionsmentioning

confidence: 99%

Radiative corrections to a supersymmetric relation: A new approach

et al. 1998

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“…In the formalism of ref. [6], the L.E.N.C. observables are expressed in terms of two form factors,ḡ 2 Z (0) ands 2 (0).…”

Section: Frameworkmentioning

confidence: 99%

“…where two coefficients C 1p and C 1n are given in terms of C 1u and C 1d as [6] C 1p ≈ 2C 1u + C 1d + 0.0134, (3.24a)…”

Section: Atomic Parity Violationmentioning

confidence: 99%

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Constraints on four-Fermi contact interactions from low-energy electroweak experiments

Cho

Hagiwara

Matsumoto³

1998

Eur. Phys. J. C

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We investigate the constraints on four-Fermi contact interactions from low-energy lepton-quark and lepton-lepton scattering experiments -polarization asymmetries in electron (muon)-nucleon scattering experiments, cesium and thallium atom parity violation measurements, neutrino-nuclei and neutrino-electron scattering experiments. These constraints are then combined by assuming the lepton and quark universalities and SU(2) L × U(1) Y gauge invariance of the contact interaction, which leave independent six lepton-quark and three pure-leptonic interactions. Impacts of these constraints on models with an additional Z-boson are briefly discussed. We also present updates of the low-energy constraints on the S and T parameters.

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“…In the SM, however, its magnitude can be accurately calculated as a function of m t and m H through the following formula [7,10],…”

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confidence: 99%

String unification scale and the hyper-charge Kac-Moody level in the non-supersymmetric standard model

Cho¹,

Hagiwara²

1998

Physics Letters B

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The string theory predicts the unification of the gauge couplings and gravity. The minimal supersymmetric Standard Model, however, gives the unification scale ∼ 2 × 10 16 GeV which is significantly smaller than the string scale ∼ 5 × 10 17 GeV of the weak coupling heterotic string theory. We study the unification scale of the non-supersymmetric minimal Standard Model quantitatively at the two-loop level. We find that the unification scale should be at most ∼ 4 × 10 16 GeV and the desired Kac-Moody level of the hyper-charge coupling should be 1.33

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A novel approach to confront electroweak data and theory

Cited by 63 publications

References 0 publications

Radiative corrections to a supersymmetric relation: A new approach

Radiative corrections to a supersymmetric relation: A new approach

Constraints on four-Fermi contact interactions from low-energy electroweak experiments

String unification scale and the hyper-charge Kac-Moody level in the non-supersymmetric standard model

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