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Ref Arxiv: 0801.0045
DOI: 10.1016/j.cpc.2008.08.004
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263 citations
Résumé:

The Supersymmetry Les Houches Accord (SLHA) provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalisations: the minimal supersymmetric standard model with violation of CP, R-parity, and flavour, as well as the simplest next-to-minimal model.

Commentaires: 35 pages

Ref HAL: hal-00264735_v1
Ref Arxiv: 0803.0813
DOI: 10.1103/PhysRevD.77.093007
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8 citations
Résumé:

We analyze the quark-gluon induced process $u g\to \tilde d\tchi_i^+$, including the one loop electroweak (EW) effects in the minimal supersymmetric model (MSSM). This process is determined by four helicity amplitudes, three of which are violating helicity conservation, and another one which respects it and is logarithmically enhanced at high energy. Combining this $u g\to \tilde d\tchi_i^+$ analysis with a corresponding one for $u g \to d W^+$, we obtain simple approximate relations between the two processes, testing the MSSM structure at the amplitude and the cross section levels. These relations become exact at asymptotic energies and, provided the SUSY scale is not too heavy, they may be approximately correct at LHC energies also. In addition to these, we study the 1loop EW corrections to the inclusive $\tilde d\tchi_i^+$ production at LHC, presenting as examples, the $p_T$ and angular distributions. Comparing these to the corresponding predictions for $W$+jet production derived earlier, provides an accurate test of the supersymmetric assignments.

Ref HAL: hal-00280728_v1
Ref Arxiv: 0802.1994
DOI: 10.1103/PhysRevD.77.113018
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23 citations
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We have computed the complete one-loop electroweak effects in the MSSM for single top (and single antitop) production in the t-channel at hadron colliders, generalizing a previous analysis performed for the dominant dt final state and fylly including QED effects. The results are quite similar for all processes. The overall Standard Model one-loop effect is small, of the few percent size. This is due to a compenstion of weak and QED contributions that are of opposite sign. The genuine SUSY contribution is generally quite modest in the mSUGRA scenario. The experimental observables would therefore only practically depend, in this framework, on the CKM Wtb coupling.

Commentaires: 10 pages

Ref HAL: in2p3-00204175_v1
Ref Arxiv: 0801.1800
DOI: 10.1140/epjc/s10052-008-0713-4
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57 citations
Résumé:

This review presents flavour related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss flavour aspects of several extensions of the Standard Model, such as supersymmetry, little Higgs model or models with extra dimensions. This includes discovery aspects as well as measurement of several properties of these heavy states. We also present public available computational tools related to this topic.

Commentaires: Report of Working Group 1 of the CERN Workshop ``Flavour in the era of the LHC'', Geneva, Switzerland, November 2005 -- March 2007

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Commentaires: Also in Nucl. Phys. B, Proc. Suppl. 174 (2007)

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Ref Arxiv: 0707.4511
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Résumé:

We reanalyse the gamma-gamma scattering data and conclude that in the massregion below 1 GeV the cross section for gamma-gamma to pi^0-pi^0 can belargely explained by the one pion exchange process with pi-pi rescattering. Theradiative width of the sigma is estimated and a model dependent separation intocontributions from direct gamma-gamma decay and decay through rescattering isobtained. We confront these findings with QCD spectral sum rule (QSSR)predictions and conclude that the sigma can have a large gluonium component inits wave function.