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• 1
Electronic Resource
Amsterdam : Elsevier
Physics Letters A 153 (1991), S. 377-380
ISSN: 0375-9601
Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
Topics: Physics
Type of Medium: Electronic Resource
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• 2
Electronic Resource
Springer
The European physical journal 37 (2004), S. 481-493
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract. The leading corrections to electroweak precision observables in the MSSM with non-minimal flavor violation (NMFV) are calculated and the effects on M W and $\sin^2\theta_{\text{eff}}$ are analyzed. The corrections are obtained by evaluating the full one-loop contributions from the third and second generation scalar quarks, including the mixing in the scalar top and charm, as well as in the scalar bottom and strange sector. Furthermore the leading corrections to the mass of the lightest MSSM Higgs-boson, m h , is obtained. The electroweak one-loop contribution to M W can amount up to 140 MeV and up to 70 x 10-5 for $\sin^2_{\text{eff}}$ , allowing one to set limits on the NMFV parameters. The corrections for m h are not significant for moderate generation mixing.
Type of Medium: Electronic Resource
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• 3
Electronic Resource
Springer
The European physical journal 17 (2000), S. 487-500
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract. We study the heavy Higgs sector of the MSSM composed of the $H^{\pm}, H^0$ and $A^0$ particles in the so-called decoupling limit where $m_{A^0}\gg m_Z$ . By integrating out these heavy Higgs particles to one-loop, we compute the effective action for the electroweak gauge bosons and find out that, in the decoupling limit, all the heavy Higgs effects can be absorbed into redefinitions of the Standard Model electroweak parameters. This demonstrates explicitely that the decoupling theorem works for the heavy MSSM Higgs particles. This is also compared with the paradigmatic and different case of the Standard Model heavy Higgs particle. Finally, this work together with our two previous works, complete the demonstration that all the non-standard particles in the MSSM, namely, squarks, sleptons, charginos, neutralinos and the heavy Higgs particles, decouple to one-loop from the low energy electroweak gauge boson physics.
Type of Medium: Electronic Resource
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• 4
Electronic Resource
Springer
The European physical journal 12 (2000), S. 673-700
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract. In the framework of the minimal supersymmetric standard model we compute the one-loop effective action for the electroweak bosons obtained after integrating out the different sleptons, squarks, neutralinos and charginos, and present the result in terms of the physical sparticle masses. In addition we study the asymptotic behavior of the two-, three- and four-point Green's functions with external electroweak bosons in the limit where the physical sparticle masses are very large in comparison with the electroweak scale. We find that in this limit all the effects produced by the supersymmetric particles can either be absorbed in the standard model parameters and gauge bosons wave functions, or else they are suppressed by inverse powers of the supersymmetric particle masses. This work, therefore, completes the proof of decoupling of the heavy supersymmetric particles from the standard ones in the electroweak bosons effective action and in the sense of the Appelquist–Carazzone theorem; we started this proof in a previous work. From the point of view of effective field theories this work can be seen as a (partial) proof that the SM can indeed be obtained from the MSSM as the quantum low-energy effective theory of the latter when the SUSY spectra are much heavier than the electroweak scale.
Type of Medium: Electronic Resource
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• 5
Electronic Resource
Springer
The European physical journal 23 (2002), S. 163-172
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract. A detailed analysis of the top-quark/squark quantum corrections to the lightest CP-even Higgs boson $(h^0)$ self-couplings is presented in the MSSM. By considering the leading one-loop Yukawa-coupling contributions of ${\cal O} (m_t^4)$ , we discuss the decoupling behavior of these corrections when the top squarks are heavy compared to the electroweak scale. As shown analytically and numerically, the large corrections can almost completely be absorbed into the $h^0$ -boson mass. Our conclusion is that the $h^0$ self-couplings remain similar to the coupling of the SM Higgs boson for the heavy top-squark sector.
Type of Medium: Electronic Resource
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• 6
Electronic Resource
Springer
The European physical journal 7 (1999), S. 313-339
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract. The possibility of a heavy supersymmetric spectrum at the Minimal Supersymmetric Standard Model is considered and the decoupling from the low energy electroweak scale is analyzed in detail. The formal proof of decoupling of supersymmetric particles from low energy physics is stated in terms of the effective action for the particles of the Standard Model that results by integrating out all the sparticles in the limit where their masses are larger than the electroweak scale. The computation of the effective action for the standard electroweak gauge bosons $W^\pm$ , Z and $\gamma$ is performed by integrating out all the squarks, sleptons, charginos and neutralinos to one-loop. The Higgs sector is not considered in this paper. The large sparticle masses limit is also analyzed in detail. Explicit analytical formulae for the two-point functions of the electroweak gauge bosons to be valid in that limit are presented. Finally, the decoupling of sparticles in the S, T and U parameters is studied analitically. A discussion on how the decoupling takes place in terms of both the physical sparticle masses and the non-physical mass parameters as the $\mu$ -parameter and the soft-breaking parameters is included.
Type of Medium: Electronic Resource
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