Results on the cross section measurement of Z boson pair–production at LEP 1,2 are presented. The more general case of neutral–current four–fermion production and the particular case of ZZ events enriched in b quarks are also discussed. All the results agree with the Standard Model predictions.

The study of top quark pair production at the Tevatron is now entering the realm of precision physics. With 2.8 fb−1 of CDF data there are over 1200 reconstructed tt̄ events in the lepton + jets channel. As the integrated luminosity increases, it is possible to improve not only measurements of the properties of the top quark but also maybe to search for new physics by comparing the tt̄ cross sect...

We study the effects of threshold resummation on the rapidity dependence of singleparticle-inclusive cross sections, using the prompt photon cross section as an example. We make use of the full resummation formula at next-to-leading logarithmic accuracy and develop a new technique for treating rapidity in resummation. We compare our phenomenological results with those of previous studies and di...

The 23gPrr(n,2n) and the 235u(r,,.2n) ~roSSsection are estimated by aPPIYing unit arit y in several approaches: a subtraction method and also by using a ratio approach that relates the above cross sections to the 23sU(n,2n) cross 239pu(n,@ cross section tO the section and the 235U(n)2n) cross section, respectively. Also, a self-consistent, simultaneous analysis of the cross section data of four...

The presence of 2γ-exchange in electron proton elastic scattering is discussed. From C-invariance and crossing symmetry, 2γ contribution induces a specific dependence of the reduced cross section on the variable ǫ. No evidence of such dependence exists in the available experimental data.

The jackknife or “leave one out” procedure is a cross-validation technique first developed by Quenouille to estimate the bias of an estimator. John Tukey then expanded the use of the jackknife to include variance estimation and tailored the name of jackknife because like a jackknife—a pocket knife akin to a Swiss army knife and typically used by boy scouts—this technique can be used as a “quick...

In geostatistics, one of the crucial problems is the choice of the covariance function. In this paper we show how to improve the cross-validation criterion, traditionally used for evaluating the /t of a covariance function, in the case of unequally spaced data. c © 2001 Elsevier Science B.V. All rights reserved

In the simulation of multi-component systems, we often encounter a problem with a lack of ground-truth data. This situation makes the validation of our simulation methods and models a difficult task. In this work we present a guideline to design validation methodologies that can be applied to the validation of multi-component simulations that lack of ground-truth data. Additionally we present a...

In this paper, combination of zone based symmetric density feature and moment invariant feature is proposed for recognition of isolated handwritten Marathi vowels. Recognition of handwritten Marathi vowels is a challenging task due to their interclass structural similarities. Since a standard database does not exist for handwritten Marathi vowels, as a part of this work database of 2294 handwri...

This paper uses off-training set (OTS) error to investigate the assumption-free relationship between learning algorithms. It is shown, loosely speaking, that for any two algorithms A and B, there are as many targets (or priors over targets) for which A has lower expected OTS error than B as vice-versa, for loss functions like zero-one loss. In particular, this is true if A is cross-validation a...