Analytic Amplitudes for Hadronic Forward Scattering : COMPETE Update

We consider several classes of analytic parametrizations of hadronic scattering amplitudes, and compare their predictions to all available forward data in hadron-hadron, gamma-p and gamma-gamma reactions. Although these parametrizations are very close for SQRTs larger than 9 GeV, it turns out that they differ markedly at low energy, where a universal Pomeron term like ln**2 s enables one to extend the fit down to SQRTs equal to 4 GeV. We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (RHO parameter) for present and future pp and antipp colliders, and on total cross sections for gamma-p into hadrons at cosmic-ray energies and for gamma-gamma into hadrons up to SQRTs equal to 1 TeV.Comment: 3 pages, 3 tables. To be published in the Proceedings of the 31st International Conference on High Energy Physics (ICHEP 2002), Amsterdam, The Netherlands, 24-31 July 200

Оценка и численное представление результатов многомерных измерений – некоторые проблемы

A brief review of some problems arising in the correct numerical expression and evaluation of results of indirect multi-parameter measurements is given. There is included a theoretical basis for determining the estimates of values, uncertainties and correlation coefficients of the indirectly obtained multi-measurand, which are processed from data of the simultaneously measured set of variables. The algebra of random vectors is used. A numerical example illustrates the linear transformation of two variables and the types of improperly evaluated results - that may occur with over-rounding. There are given thresholds of the safe uniform rounding of mean vector and its scatter ellipsoid. There is proposed an upgrading of the GUM Example H.2 and of the uncertainty equation for nonlinear functions. It is also evidenced that correlation matrix of 2010 data of fundamental physical constants recommended by CODATA has non-negligible negative eigenvalues. In the end of this work it is argued for the urgent needs of standardization of e-publication of the experimental data in two parts: e-printed traditional narrative part, and an attached computer readable file with all numerical input data and results, to allow “fast” numerical peer review of the proposed publication reporting new measurement results. This work is a result of an inter-disciplinary cooperation of a metrologist and a nuclear physicist.Надано короткий огляд деяких проблем, що виникають у правильному числовому виразі і оцінці результатів непрямих багатопараметричних вимірювань. Наведено теоретичні основи визначення оцінок величин, невизначеності і коефіцієнтів кореляції непрямо отриманих декількох вимірюваних величин, які обробляються за даними одночасно виміряної множини змінних. Використовується алгебра випадкових векторів. Числовий приклад ілюструє лінійне перетворення двох змінних і типи неправильно оцінених результатів, які можуть бути отримані при округленні. Запропоновано модернізація прикладу GUM Н.2 і рівняння невизначеності для нелінійних функцій. Це доводить, що кореляційна матриця даних фундаментальних фізичних констант 2010 року, рекомендованих CODATA, має не мізерно малі негативні власні значення. Ця робота є результатом міждисциплінарного співробітництва метролога і фізика-ядерника.Дан краткий обзор некоторых проблем, возникающих в правильном числовом выражении и оценке результатов косвенных многопараметрических измерений. Приведены теоретические основы определения оценок величин, неопределенностей и коэффициентов корреляции полученных косвенно нескольких измеряемых величин, которые обрабатываются по данным одновременно измеренного множества переменных. Используется алгебра случайных векторов. Числовой пример иллюстрирует линейное преобразование двух переменных и типы неправильно оцененных результатов, которые могут быть получены при округлении. Предложена модернизация примера GUM Н.2 и уравнения неопределенности для нелинейных функций. Это доказывает, что корреляционная матрица данных фундаментальных физических констант 2010 года, рекомендованных CODATA, имеет не ничтожно малые отрицательные собственные значения. Эта работа является результатом междисциплинарного сотрудничества метролога и физика-ядерщика

Review of particle physics

This biennial Review summarizes much of particle physics. Using data from previous editions, plus 2778 new measurements from 645 papers, we list, evaluate, and average measured properties of gauge bosons, leptons, quarks, mesons, and baryons. We also summarize searches for hypothetical particles such as Higgs bosons, heavy neutrinos, and supersymmetric particles. All the particle properties and search limits are listed in Summary Tables. We also give numerous tables, figures, formulae, and reviews of topics such as the Standard Model, particle detectors, probability, and statistics. Among the 108 reviews are many that are new or heavily revised including those on CKM quark-mixing matrix, Vud & Vus, Vcb & Vub, top quark, muon anomalous magnetic moment, extra dimensions, particle detectors, cosmic background radiation, dark matter, cosmological parameters, and big bang cosmology

Review of particle physics

The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,143 new measurements from 709 papers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle properties and search limits are listed in Summary Tables. We give numerous tables, figures, formulae, and reviews of topics such as Higgs Boson Physics, Supersymmetry, Grand Unified Theories, Neutrino Mixing, Dark Energy, Dark Matter, Cosmology, Particle Detectors, Colliders, Probability and Statistics. Among the 120 reviews are many that are new or heavily revised, including a new review on Machine Learning, and one on Spectroscopy of Light Meson Resonances. The Review is divided into two volumes. Volume 1 includes the Summary Tables and 97 review articles. Volume 2 consists of the Particle Listings and contains also 23 reviews that address specific aspects of the data presented in the Listings. The complete Review (both volumes) is published online on the website of the Particle Data Group (pdg.lbl.gov) and in a journal. Volume 1 is available in print as the PDG Book. A Particle Physics Booklet with the Summary Tables and essential tables, figures, and equations from selected review articles is available in print, as a web version optimized for use on phones, and as an Android app