experiment & modeling

O & M Conference (upcoming) and a bit more on triggering from a participant…..

copy-cropped-ampersand-logo-blog1I notice that one of the contributed speakers, Koray Karaca*, at the upcoming Ontology and Methodology Conference at Virginia Tech (May 4-5) focuses his paper on triggering!  I entirely agree with the emphasis on the need to distinguish different questions at multiple stages of an inquiry or research endeavor from the design, collection and modeling of data to a series of hypotheses, questions, problems, and threats of error.  I do note a couple of queries below that I hope will be discussed at some point. Here’s part of his abstract…which may be found on the just created O & M Conference Blog (link is also at the O&M page on this blog). Recent posts on the Higgs data analysis are herehere, and here  Kent Staley had a recent post on the Higgs as well. (For earlier Higgs discussions search this blog.)

Koray Karaca
The method of robustness analysis and the problem of data-selection at the ATLAS experiment

In the first part, I characterize and distinguish between two problems of “methodological justification” that arise in the context of scientific experimentation. What I shall call the “problem of validation” concerns the accuracy and reliability of experimental procedures through which a particular set of experimental data is first acquired and later transformed into an experimental result. Therefore, the problem of validation can be phrased as follows: how to justify that a particular set of data as well as the procedures that transform it into an experimental result are accurate and reliable, so that the experimental result obtained at the end of the experiment can be taken as valid.  On the other hand, what I shall call the “problem of exploration” is concerned with the methodological question of whether an experiment is able, either or both, (1) to provide a genuine test of the conclusions of a scientific theory or hypothesis if the theory in question has not been previously (experimentally) tested, or to provide a novel test if the theory or hypothesis in question has already been tested, and (2) to discover completely novel phenomena; i.e., phenomena which have not been predicted by present theories and detected in previous theories. Even though the problem of validation and the ways it is dealt with in scientific practice has been thoroughly discussed in the literature of scientific experimentation, the significance of the problem of exploration has not yet been fully appreciated. In this work, I shall address this problem and examine the way it is handled in the present-day high collision-rate particle physics experiments. To this end, I shall consider the ATLAS experiment, which is one of the Large Hadron Collider (LHC) experiments currently running at CERN. …What are called “interesting events” are those collision events that are taken to serve to test the as-yet-untested predictions of the Standard Model of particle physics (SM) and its possible extensions, as well as to discover completely novel phenomena not predicted before by any theories or theoretical models.

To read the rest of the abstract, go to our just-made-public O & M conference blog.

First let me say that I’m delighted this case will be discussed at the O&M conference, and look forward to doing so. Here are a couple of reflections from the abstract, partly on terminology. First, I find it interesting that he places “tiggering” (what I alluded to in my last post as a behavioristic, pre-data, task) under “exploratory”. He may be focussed more on what occurs (in relation to this one episode anyhow) when data are later used to check for indications of anomalies for the Standard Model Higgs–having been “parked” for later analysis.  I thought the exploratory stage is usually a stage of informal or semi-formal data analysis to find interesting patterns and potential ingredients (variables, functions) for models, model building, and possible theory development.  When Strassler heard there would be “parked data” for probing anomalies, I take it his theories kicked in to program those exotic indicators. Second, it seems to me that philosophers of science and “confirmation theorists” of various sorts, have focussed on when “data,” all neat and tidied up, count as supporting, confirming, falsifying hypotheses and theories.  I wouldn’t have thought the problem of data collection, modeling or justifying data was “thoroughly discussed”–It absolutely should be– just that it seems all-too-rare. I may be wrong (I’d be glad to see references).

*Koray is a postdoctoral research fellow at the University of Wuppertal, and he knows I’m mentioning him here.

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