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Data on the properties of leptons, mesons, and baryons are listed, referenced, averaged, and summarized in tables and wallet cards. This is an updating of the Reviems of Moderrt Physics article of October 1965. This data survey is an updating of that of October j.965. ' An intermediate version was distributed at the XIII International Conference on High Energy Physics held at Berkeley in August 1966. This time a large number of early data and references have been deleted from the listings; these pioneer works can be found in any earlier edition. 'As always, ' we make two requests of our readers:(1) Please inform us of mistakes and omissions.We cannot do an adequate job without this help.(2) We wish to emphasize that it is not appropriate to refer to this compilation instead of the original published work; nor is it necessary, since we provide complete listings of references! Our procedures are as follows. We read journals and preprints and from information so obtained we punch data cards and reference cards for each relevant experiment. These cards are listed following the main text.Computer programs make weighted averages of these data, and the results are summarized in three tables.(1) Table S covers all stable particles (leptons, mesons, and baryons), i.e. , those states which are immune to'decay via the strong interaction; (2) Meson Resonances, and (3) Baryon Resonances. For convenience, these tables include basic information on stable mesons and baryons. Each table is of slightly different form; thus Table S includes magnetic moments and weak-decay asym-*Work performed under the auspices of the U.S. Atomic Energy Commission. , Rpv. Mod. Phys. 3V, 633 (1965). metry parameters, the meson table has two columns of names, one familiar, another more orderly, and the baryon table includes information on what momentum pion and E-meson beams will form certain resonances.These three tables, along with other useful information, appear at the end of this article on perforated sheets. These are the new "wallet cards": the paper is now thinner and more durable, and the reader can fold them according to his needs. Of course most of our work involves deciding how to handle data. Often it is best not to average a result, either because it is already incorporated in a later paper or because we have some reservations about the experiment. (We then punch any character in Col. 8 of our data cards, thereby instructing the averaging programs to ignore the result. ) When the data for an iedieiduu/ particle received special treatment, this is noted either in the listings or in a special note following them. NOTES ON THE TABLESQuoted errors represent standard deviations. Inequalities are also standard deviations or 1/e confidence levels.The quantum number C stands for the eigenvalue of the charge-conjugation operator applied to a neutral particle. The notation C"(rt for neutral) means the eigenvalue of C applied to the eeltral @&ember of a nonstrange triplet, like the pion. Thus for all members of the SU(3) 0 nonet, C"=+1.Well-esta...

We have developed an extensive model of atmospheric v interactions which provide the backgrounds to nucleon-decay experiments. We report results from a 417-live-day exposure of the Irvine-Michigan-Brookhaven detector. During this time 401 contained events were observed at a rate and with characteristics consistent with atmospheric v interactions. We have calculated the expected backgrounds to a variety of two-and three-body decay modes and have set lower limits on many nucleon partial lifetimes.