Structure Functions are not Parton Probabilities

We explain why contrary to common belief, the deep inelastic scattering structure functions are not related to parton probabilities in the target.Comment: 4 pages. Invited talk presented during the `International Light-Cone Workshop', Trento, ECT, September 3-11, 2001. Updated Report-Number

Filling in the Gaps: Extrasystemic Mechanisms for Addressing Imbalances between the International Legal Operating System and the Normative System

What happens when there is an imbalance between the operating and normative systems of international law? One obvious outcome is nothing; the imbalance remains, and the norms of the system are not given full effect. For example, human rights provisions abound, but they can be widely ignored in the absence of enforcement mechanisms. In this article, we identify several other possibilities. Our contention is that adaptations occur that compensate for, or at least mitigate, the effects of the operating-normative systems imbalance. Specifically, we explore four kinds of extrasystemic (at least from the perspective of the international legal system) adaptations: (1) actions by nongovernmental organizations and transnational networks, (2) internalization of international law, (3) domestic legal and political processes, and (4) soft law mechanisms. Our contention is that the international legal system is partly kept functioning by these actors and mechanisms, even though they technically fall outside the framework of the international legal system

Irrational War and Constitutional Design: A Reply to Professors Nzelibe and Yoo

This Reply proceeds as follows. Part I outlines the argument of the Nzelibe and Yoo paper. Part II considers their principal-agent analysis in the context of the American political system. Part III elaborates on the democratic peace literature, demonstrating that it does not support the conclusions that they draw. Part IV addresses the argument that we are in a new strategic situation, such that old rules ought not apply. Part V concludes

Irrational War and Constitutional Design: A Reply to Professors Nzelibe and Yoo

This Reply proceeds as follows. Part I outlines the argument of the Nzelibe and Yoo paper. Part II considers their principal-agent analysis in the context of the American political system. Part III elaborates on the democratic peace literature, demonstrating that it does not support the conclusions that they draw. Part IV addresses the argument that we are in a new strategic situation, such that old rules ought not apply. Part V concludes

Worth A Pound Of Cure? An Empirical Assessment Of The Bush Doctrine And Preventive Military Action

The Bush Doctrine, or the proposal that allows the use of military force preventively to address prospective attack from terrorists or involving weapons of mass destruction, has been debated from various normative and legal vantage points. In this article, we introduce the new evaluative criterion that such military action must also produce the desired outcomes of defeating opponents and preventing future attacks. We test the efficacy of preventive military actions over the last two centuries. We conclude that using military force in a preventive fashion provides very limited, if any value, to states that employ this strategy. At best, there is less than an even chance of victory in such circumstances and this requires a full-scale war. The utility of preventive strikes diminishes tremendously in attacks short of war, and indeed the minimal success rate (around 10%) is no better than using coercive diplomacy by merely threatening force rather than actually using it. Preventive actions also did not significantly delay the appearance of new security threats and indeed such actions produce the conditions that enhance the maintenance of international rivalries, rather than contributing to their resolution. Finally, available evidence suggests that preventive strikes are not well-suited to terrorist threats, and states might be reluctant to employ them in any case. Studies of retaliation to terrorist attacks find little value to the former, with no long term deterrent effects

Anomalous gauge-boson couplings and the Higgs-boson mass

We study anomalous gauge-boson couplings induced by a locally SU(2) x U(1) invariant effective Lagrangian containing ten operators of dimension six built from the boson fields of the Standard Model (SM) before spontaneous symmetry breaking (SSB). After SSB some operators lead to new three- and four-gauge-boson interactions, some contribute to the diagonal and off-diagonal kinetic terms of the gauge bosons and to the mass terms of the W and Z bosons. This requires a renormalisation of the gauge-boson fields, which, in turn, modifies the charged- and neutral-current interactions, although none of the additional operators contain fermion fields. Bounds on the anomalous couplings from electroweak precision measurements at LEP and SLD are correlated with the Higgs-boson mass m_H. Rather moderate values of anomalous couplings allow m_H up to 500 GeV. At a future linear collider the triple-gauge-boson couplings gammaWW and ZWW can be measured in the reaction e+e- --> WW. We compare three approaches to anomalous gauge-boson couplings: the form-factor approach, the addition of anomalous coupling terms to the SM Lagrangian after and, as outlined above, before SSB. The translation of the bounds on the couplings from one approach to another is not straightforward. We show that it can be done for the process e+e- --> WW by defining new effective ZWW couplings.Comment: 50 pages, 4 figures; version to appear in EPJ

Logarithmic corrections in the two-dimensional Ising model in a random surface field

In the two-dimensional Ising model weak random surface field is predicted to be a marginally irrelevant perturbation at the critical point. We study this question by extensive Monte Carlo simulations for various strength of disorder. The calculated effective (temperature or size dependent) critical exponents fit with the field-theoretical results and can be interpreted in terms of the predicted logarithmic corrections to the pure system's critical behaviour.Comment: 10 pages, 4 figures, extended version with one new sectio

Compton telescope with coded aperture mask: Imaging with the INTEGRAL/IBIS Compton mode

Compton telescopes provide a good sensitivity over a wide field of view in the difficult energy range running from a few hundred keV to several MeV. Their angular resolution is, however, poor and strongly energy dependent. We present a novel experimental design associating a coded mask and a Compton detection unit to overcome these pitfalls. It maintains the Compton performance while improving the angular resolution by at least an order of magnitude in the field of view subtended by the mask. This improvement is obtained only at the expense of the efficiency that is reduced by a factor of two. In addition, the background corrections benefit from the coded mask technique, i.e. a simultaneous measurement of the source and background. This design is implemented and tested using the IBIS telescope on board the INTEGRAL satellite to construct images with a 12' resolution over a 29 degrees x 29 degrees field of view in the energy range from 200 keV to a few MeV. The details of the analysis method and the resulting telescope performance, particularly in terms of sensitivity, are presented

Boundary critical behaviour at mm-axial Lifshitz points: the special transition for the case of a surface plane parallel to the modulation axes

The critical behaviour of $d$-dimensional semi-infinite systems with $n$-component order parameter $\bm{\phi}$ is studied at an $m$-axial bulk Lifshitz point whose wave-vector instability is isotropic in an $m$-dimensional subspace of $\mathbb{R}^d$. Field-theoretic renormalization group methods are utilised to examine the special surface transition in the case where the $m$ potential modulation axes, with $0\leq m\leq d-1$, are parallel to the surface. The resulting scaling laws for the surface critical indices are given. The surface critical exponent $\eta_\|^{\rm sp}$, the surface crossover exponent $\Phi$ and related ones are determined to first order in \epsilon=4+\case{m}{2}-d. Unlike the bulk critical exponents and the surface critical exponents of the ordinary transition, $\Phi$ is $m$-dependent already at first order in $\epsilon$. The \Or(\epsilon) term of $\eta_\|^{\rm sp}$ is found to vanish, which implies that the difference of $\beta_1^{\rm sp}$ and the bulk exponent $\beta$ is of order $\epsilon^2$.Comment: 21 pages, one figure included as eps file, uses IOP style file