D.B. Lichtenberg's Meson and Baryon Spectroscopy PDF

By D.B. Lichtenberg

This paintings originated in a sequence of lectures on meson and baryon ex­ stated states which I gave on the Stanford Linear Accelerator middle within the fall of 1962. The notes of those lectures have been issued as a Stanford Uni­ versity file (SLAC-13) in March, 1963. within the fall of 1963, I gave a revised set of lectures on meson and baryon spectroscopy at Indiana collage. In either situations, the talks got basically for experi­ psychological physicists. In getting ready the notes of those talks for booklet, i've got extra a few introductory fabric on pions, nucleons, kaons, and hyperons. My major emphasis is at the experimental proof about the spectros­ replica of the mesons and baryons and at the use of conservation legislation of their interpretation. i've got both pointed out in brief or passed over totally reasons which rely on dynamical types. even if i've got given a couple of evidence concerning the electromagnetic and susceptible decays of a few mesons and baryons, i have never mentioned the idea of those decays. this isn't a complete evaluate of the topic of the strongly interacting debris, and the checklist of references isn't entire. additionally, i have never continually dedicated time to an issue in share to its impor­ tance, yet have spent extra time on subject matters that have relatively me. however, i am hoping that i've got supplied an invaluable precis of an important evidence in regards to the spectroscopy of the mesons and baryons.

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Extra info for Meson and Baryon Spectroscopy

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The value of the asymmetry parameter is poorly known. 54 . The large value of the asymmetry parameter in a- decay favors spin J = l/z for the a, but the errors are too large to rule out J = 3/Z' Too few events have been collected for the Adair analysis to give the spin. , from the study of the reaction K- + P -+ + K+ . However, thus far the parity of the a has not been measured. It is usually assumed * that thea,like the N,A, and~,has quantum numbersJP= l/ z+. a- * The spin is now established to be 1/.

The observed rate of ~ decay is about 1/20 as large as the value calculated on the assumption that the coupling constant is the same as in the ~ decay of the neutron. Many of the weak decay rates of the other strange particles are comparably reduced. It is interesting to consider the relation between the quantum numbers of the A and those of its decay products, excluding the quantum numbers of the leptons. 1): 1. Hypercharge is not conserved but changes by LI Y = + 1. 2. In the leptonic decay the charge number (of the strongly interacting particles) is not conserved, but changes by LI Q = + 1.

10. The kaon A. 6 MeV. 0079. From the formula of GELL-MANN and NISHI]IMA, it is seen that the kaon has hypercharge Y = 1. This being so, an antikaon has Y = -1, and is distinct from a kaon. Therefore, there are two antikaons: KO and K- = j(+. The interactions of the K and j( with nucleons are very different, as the KN system has Y = 2, while the KN system has Y = o. 52 In particular, there exist hyperons with Y = 0 but no known hyperons with Y = 2. Thus, the KN interaction often leads to hyperon production whereas (at least at low energies) the KN interaction does not.

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