Andreas von Manteuffel

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In this work, we complete the calculation of the soft part of the two-loop integrated jet thrust distribution in e+e− annihilation. This jet mass observable is based on the thrust cone jet algorithm, which involves a veto scale for out–of–jet radiation. The previously uncomputed part of our result depends in a complicated way on the jet cone size, r, and at(More)
J. Ablinger1, A. Behring2, J. Blümlein†2, A. De Freitas2, A. Hasselhuhn3, A. von Manteuffel4, C.G. Raab1,5, M. Round1,2, C. Schneider1, and F. Wißbrock1,2,6 1 Research Institute for Symbolic Computation (RISC), Johannes Kepler University, Altenbergerstraße 69, A–4040, Linz, Austria 2 Deutsches Elektronen-Synchrotron, DESY, Platanenallee 6, D-15738 Zeuthen,(More)
We study skyrmions in the littlest Higgs model and discuss their possible role as dark matter candidates. Stable massive skyrmions can exist in the littlest Higgs model also in absence of an exact parity symmetry, since they carry a conserved topological charge due to the non-trivial third homotopy group of the SU(5)/SO(5) coset. We find a spherically(More)
We discuss two aspects of the color dipole picture of high energy photon-proton scattering. First we present bounds on various ratios of deep inelastic structure functions resulting from the dipole picture that, together with the measured data, can be used to restrict the kinematical range of its applicability. The second issue that we address is the choice(More)
High-precision analyses are presented for the production of scalar sleptons, selectrons and smuons in supersymmetric theories, at future e+e− and e−e− linear colliders. Threshold production can be exploited for measurements of the selectron and smuon masses, an essential ingredient for the reconstruction of the fundamental supersymmetric theory at high(More)
Determining the global minimum of Higgs potentials with several Higgs fields like the next-tominimal supersymmetric extension of the Standard Model (NMSSM) is a non-trivial task already at the tree level. The global minimum of a Higgs potential can be found from the set of all its stationary points defined by a multivariate polynomial system of equations.(More)
Integration by parts reduction is a standard component of most modern multi-loop calculations in quantum field theory. We present a novel strategy constructed to overcome the limitations of currently available reduction programs based on Laporta’s algorithm. The key idea is to construct algebraic identities from numerical samples obtained from reductions(More)
Complementing the preceding study of charged scalar leptons, the sector of the neutral scalar leptons, sneutrinos, is investigated in a high-precision analysis for future e + e − linear colliders. The theoretical predictions for the cross-sections are calculated at the thresholds for non-zero widths and in the continuum including higher-order corrections at(More)
We study the dipole picture of high-energy virtual-photon-proton scattering. It is shown that different choices for the energy variable in the dipole cross section used in the literature are not related to each other by simple arguments equating the typical dipole size and the inverse photon virtuality, contrary to what is often stated. We argue that the(More)
We present a study of Ioffe times in deep inelastic electron-proton scattering. We deduce ‘experimental’ Ioffe-time distributions from the smallx HERA data as described by a particular colourdipole-model fit. We show distributions for three representative �* p c.m. energies W and various values of the photon virtuality Q 2. These distributions are rather(More)