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AbstractAbstract
[en] The renormalized perturbation expansion for the line width of the van der Pol oscillator is extended to fifth order. The results of the previously obtained fourth order are thereby improved for pump strength a approx. < 5. No indication of a breakdown of the expansion, even for strong pumping, is found. (orig.)
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Z. Phys., B; v. 36(2); p. 205-208
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[en] Far above threshold the production process e+e- → t t can be analyzed using effective field theories. In this paper we consider the invariant-mass distribution of top-jets and report about our computation of the two-loop heavy-quark jet-function. This is a key part of a next-to-next-to-leading order analysis, and already allows for a resummation of all large logs which effect the shape of the top-invariant-mass distribution at next-to-next-to-leading log order. A top-mass scheme is defined which is suitable for measurements involving jets, and whose anomalous dimension is determined by the cusp-anomalous dimension to all orders in perturbation theory.
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Nuovo Cimento della Societa Italiana di Fisica. B, General Physics, Relativity, Astronomy and Mathematical Physics and Methods; ISSN 1594-9982;
; v. 123(6-7); p. 857-859

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Gasser, J., E-mail: gasser@itp.unibe.ch2000
AbstractAbstract
[en] I present an outline of chiral perturbation theory and discuss some recent developments in the field
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QCD 99: International Euroconference in quantum chromodynamics; Montpellier (France); 7-13 Jul 1999; S0920563200005739; Copyright (c) 2000 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
No abstract available
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Available from http://dx.doi.org/10.1070/RM2002v057n03ABEH000524; Abstract only; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
No abstract available
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American Nuclear Society annual meeting; Las Vegas, NV, USA; 8 - 13 Jun 1980; CONF-800607--; Published in summary form only.
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Transactions of the American Nuclear Society; ISSN 0003-018X;
; v. 34 p. 823-824

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AbstractAbstract
[en] We discuss the validity of the perturbation treatments and we derive some expressions for the Moessbauer lineshape both without and with the noise approximation
Source
International conference on Moessbauer spectroscopy; Portoroz, Yugoslavia; 10 - 14 Sep 1979
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Journal de Physique. Colloque; ISSN 0449-1947;
; (no.C-1); p. 223-224

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AbstractAbstract
[en] A small-time approach to the description of the time-dependent perturbation theory is proposed. For this purpose we assume that within the interaction-region the particle is not necessarily a point-like one, thus also considering additionally, a large imaginary contribution (Im Vsub(ii)<<0) of the interaction potential which is confined inside the small-time region. It can be then proved that the validity of the so implied Schroedinger equation with the nonhermitian (hermitian) interaction can be assured only up to a certain upper (lower) bound of the time-parameter. Alternatively, such results are able to probe, in this way also, the existence of a nonzero intrinsic time-dispersion
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Annales de la Fondation Louis de Broglie; v. 5(1); p. 31-38
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Cichy, K.; Gonzalez Lopez, J.; Jansen, K.; Kujawa, A.; Shindler, A., E-mail: jenifer.gonzalez.lopez@desy.de
arXiv e-print [ PDF ]2008
arXiv e-print [ PDF ]2008
AbstractAbstract
[en] We study cutoff effects at tree-level of perturbation theory for maximally twisted mass Wilson, overlap and the recently proposed Creutz fermions. We demonstrate that all three kinds of lattice fermions exhibit the expected O(a2) scaling behaviour in the lattice spacing. In addition, the sizes of these cutoff effects are comparable for the three kinds of lattice fermions considered here. Furthermore, we analyze situations when twisted mass fermions are not exactly at maximal twist and when overlap fermions are studied in comparison to twisted mass fermions when the quark masses are not matched
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S0550-3213(08)00155-7; Available from http://dx.doi.org/10.1016/j.nuclphysb.2008.03.004; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] This is an investigation of conditions under which the property that a flow has a (unique) measure with maximal entropy is stable under local perturbations of the base
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Available from http://dx.doi.org/10.1070/SM2001v192n07ABEH000580; Country of input: International Atomic Energy Agency (IAEA)
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Sbornik. Mathematics; ISSN 1064-5616;
; v. 192(7); p. 1001-1024

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Xia Lili; Zhao Xianlin; Li Yuancheng, E-mail: xialilixialili@yahoo.com.cn2008
AbstractAbstract
[en] The perturbation of symmetries and Mei adiabatic invariants of nonholonomic systems with servoconstraints are studied. The exact invariants in the form of Mei conserved quantities introduced by the Mei symmetry of nonholonomic systems with servoconstraints without perturbations are given. Based on the definition of higher-order adiabatic invariants of mechanical systems, the perturbation of Mei symmetries for nonholonomic systems with servoconstraints under the action of small disturbance is investigated, and Mei adiabatic invatiants of the system are obtained. An example is given to illustrate the application of the results
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Available from http://dx.doi.org/10.1088/0253-6102/50/4/12; Country of input: International Atomic Energy Agency (IAEA)
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Communications in Theoretical Physics; ISSN 0253-6102;
; v. 50(4); p. 855-860

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