Article

# Complete one-loop corrections to decays of charged and CP-even neutral Higgs bosons into sfermions

Institut für Hochenergiephysik der Österreichischen Akademie der Wissenschaften, A-1050 Vienna, Austria
(Impact Factor: 3.93). 02/2007; 776(1):138-169. DOI: 10.1016/j.nuclphysb.2007.03.048
Source: arXiv

ABSTRACT

We present the full one-loop corrections to charged and CP-even neutral Higgs boson decays into sfermions including also the crossed channels. The calculation was carried out in the minimal supersymmetric extension of the Standard Model and we use the on-shell renormalization scheme. For the down-type sfermions, we use running fermion masses and the trilinear coupling Af as input. Furthermore, we present the first numerical analysis for decays according to the Supersymmetric Parameter Analysis project. This requires the renormalization of the whole MSSM. The corrections are found to be numerically stable and not negligible.

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Available from: Walter Majerotto
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• "Also another similar calculation for stop production and direct decay was recently performed in [50]. Conversely, calculations of higher-order contributions to either production [12, 51–72] or decay [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] of squarks (and gluinos) are manifold and include electroweak NLO corrections as well as QCD corrections beyond NLO. The study of the signature 2j + l + l − (OS-SF) + E T (+X) presented here includes the contribution from squark–squark production , which constitutes the dominant production channel in the case of heavy squarks and gluinos, as already pointed out. "
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ABSTRACT: In this paper we present an analysis at NLO of the contribution from squark-squark production to the experimental signature 2j + 2l + missing E_T (+X) with opposite-sign same flavor leptons, taking into account decays and experimental cuts. We consider the case in which one squark decays directly into the lightest neutralino chi^0_1 and the other one into the second lightest neutralino and subsequently into l^+l^-chi^0_1 via an intermediate slepton. On one hand we study effects of the NLO corrections on invariant mass distributions which can be used for future parameter determination. On the other hand we analyze the impact on predictions for cut-and-count searches using this experimental signature.
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• "These corrections often compensate those from QCD on the level of integrated decay widths, however, they depend strongly on the model parameters. Corresponding NLO electroweak corrections for third generation squark decays have been studied in [60] [61] [62] [63]. "
##### Article: NLO corrections to squark-squark production and decay at the LHC
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ABSTRACT: We present an analysis of the signature 2j + T (+X) via squark-squark production and direct decay into the lightest neutralino, $$pp\to \widetilde{q}\widetilde{q}\to jj\widetilde{\chi}_1^0\widetilde{\chi}_1^0\left( {+X} \right)$$, in next-to-leading order QCD within the framework of the minimal supersymmetric standard model. In our approximation the produced squarks are treated on shell. Thus, the calculation of production and decay factorizes. In this way, we provide a consistent, fully differential calculation of NLO QCD factorizable corrections to the given processes. Clustering final states into partonic jets, we investigate the experimental inclusive signature 2j + T for several benchmark scenarios. We compare resulting differential distributions with leading-order approximations rescaled by a flat K-factor and examine a possible impact for cut-and-count searches for supersymmetry at the LHC.
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ABSTRACT: We present a consistent renormalization of the top and bottom quark/squark sector of the MSSM with complex parameters (cMSSM). Various renormalization schemes are defined, analyzed analytically and tested numerically in the decays Stop_2 -> Sbot_i H+/W+ (i = 1,2). No scheme is found that produces numerically acceptable results over all the cMSSM parameter space, where problems occur mostly already for real parameters. Two schemes are identified that show the most robust behavior. A numerical analysis of the four partial stop decay widths is performed in our "preferred" scheme, "m_b, A_b DRbar". The full one-loop corrections to the corresponding partial decay widths are evaluated including hard QED and QCD radiation. We find mostly modest corrections at the one-loop level. Comment: 47 pages, 12 figures
Preview · Article · Jul 2010 · Physical review D: Particles and fields