It is not possible to dismiss the atomistic paradigm because the proposed elementary particles are too many (and, hence, it is claimed, they do not provide a simple account of nature) or because it is not possible to observe quarks in an isolated manner. The developments in particle physics have brought about radical changes to our notions of simplicity and observability, and in this paper we elaborate on these changes. It is as a result of these changes that the present (...) situation in elementary particle physics justify us to claim that we have indeed reached a level of explanation where the constituent particles (quarks, leptons, gluons, and intermediate bosons) used for the explanation of the various phenomena considered to be delineating a particular level in the descriptive framework of the physical phenomena and a specific stratum in the organization of nature, can be regarded as elementary. (shrink)

Writing the history of elementary particle physics has all the problems common to writing the history of any other subject “in the making”. There is, however, an additional characteristic, unique to this branch of physics. The development of particle physics, unlike the situation in other branches of physics, reveals a continuously changing picture of what its object of investigation is, of what, in other words, the things we call particles are and how elementary they should be considered. The history of (...) elementary particle physics is, in a way, the history of the continuous reinterpretation of both the ontological and methodological status of the notion of elementarity. Hence, examining the history of elementary particle physics is also an attempt to explicate this changing collective consciousness of the scientific community about the elementarity of particles. In studying, therefore, (practically any aspect of) the history of elementary particle physics, one has to be sensitive about a number of philosophical, and primarily methodological issues which have acquired an added significance due to the relatively recent and mainly theoretical developments. (shrink)