3,779 research outputs found
Experimental Studies of Diffractive Processes at the Tevatron
We review the diffractive measurements made by the CDF and D\O\
collaborations during Run I at the Tevatron and summarize the detector upgrades
relevant for the Run II diffractive physics program.Comment: 6 pages, 2 figures (in eps) talk given at XXXI International
Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China URL
http://ismd31.ccnu.edu.cn
P Values and Nuisance Parameters
We review the de nition and interpretation of p values, describe methods to incorporate systematic uncertainties in their calculation, and brie y discuss a non-regular but common problem caused by nuisance parameters that are unidenti ed under the null hypothesis
Reference priors for high energy physics
Bayesian inferences in high energy physics often use uniform prior
distributions for parameters about which little or no information is available
before data are collected. The resulting posterior distributions are therefore
sensitive to the choice of parametrization for the problem and may even be
improper if this choice is not carefully considered. Here we describe an
extensively tested methodology, known as reference analysis, which allows one
to construct parametrization-invariant priors that embody the notion of minimal
informativeness in a mathematically well-defined sense. We apply this
methodology to general cross section measurements and show that it yields
sensible results. A recent measurement of the single top quark cross section
illustrates the relevant techniques in a realistic situation
Trial factors for the look elsewhere effect in high energy physics
When searching for a new resonance somewhere in a possible mass range, the
significance of observing a local excess of events must take into account the
probability of observing such an excess anywhere in the range. This is the so
called "look elsewhere effect". The effect can be quantified in terms of a
trial factor, which is the ratio between the probability of observing the
excess at some fixed mass point, to the probability of observing it anywhere in
the range. We propose a simple and fast procedure for estimating the trial
factor, based on earlier results by Davies. We show that asymptotically, the
trial factor grows linearly with the (fixed mass) significance
Temps Moderns 2007, no. 137
Abstract not availabl
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