By Antonino Zichichi (auth.), Antonino Zichichi (eds.)
In July 1975 a gaggle of 122 physicists from sixty eight laboratories of 27 nations met in Erice to wait the thirteenth process the foreign university of Subnuc1ear Physics. The nations represented on the college have been: Australia, Austria, Belgium, Brazil, Canada, Chile, Denmark, France, Germany, Greece, India, Iran, Israel, Italy, Japan, Mexico, The Netherlands, Norway, Poland, Portugal, Spain, Sweden, Switzerland, Turkey, the uk, the U.S. of the US and Yugoslavia. the college was once backed by way of the Italian Ministry of Public schooling (MPI), the Italian Ministry of medical and Technolog ical learn (MRST) , the North Atlantic Treaty association (NATO), the nearby Sicilian govt (ERS) and the Weizmann Institute of technological know-how. the college used to be probably the most fascinating, because of the striking variety of discoveries made not just within the box of the recent par ticles by way of the MIT-BNL (reported through S. C. C. Ting) and by means of the SLAC SPEAR (reported via M. Breidenbach) teams, but in addition within the box of excessive power neutrino interactions the place Carlo Rubbia observes ~ pairs, including bumps within the overall power of the hadronic process at Wh~4 GeV and a discontinuity within the at Ev~50 GeV plus a bump at Wmin~4 GeV; most of these phenomena being in all probability attached. To this extraordinary volume of latest and intriguing effects it needs to be further the nice discovery of DORIS (reported via B. Wiik) at the first instance of a brand new particle laptop: the spotlight of the Course.
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Extra resources for New Phenomena in Subnuclear Physics: Part A
MAIANI c (P'PP) Y I I --~ Fig. 2 - " Weight diagram of the 1/2+ baryon multiplet. 45 CHARM SPECTROSCOPY (p (p'p'n) , , I P p) --(p'p'p) -L *- / Fig. 3 - Weight diagram of the 3/2+ baryon multiplet. 46 L. MAlAN I Group theoretical methods The quark model lagrangian has definite transformation properties under SU (4): cI ;=Jo tal (17) 15 where J 0 is SU(4) invariant, and '/15(= JMB3s given in eq. (10) ) is a superposition of operators transforming as the diagonal operators of the ~15 representation: J.
As for charmonium states, 'lI (3104) is an obvious candidate for the 1 S state 9) and 'lI' (3765) for 23S (like the p' ). The charmonium scheme predicts P-wave charmonium states to be lighter than 'lI f (10,11). On the basis of the Zweig rule, we therefore anticipate narrow width also for these mesons, and cascade decays of 'lI f into 'lI through these states, via l' -emission. Such decays give rise to monochromatic l' -rays, which in fact have been detected at DORIS and SPEAR. We shall come back to this in Sec.
46 L. MAlAN I Group theoretical methods The quark model lagrangian has definite transformation properties under SU (4): cI ;=Jo tal (17) 15 where J 0 is SU(4) invariant, and '/15(= JMB3s given in eq. (10) ) is a superposition of operators transforming as the diagonal operators of the ~15 representation: J. , quark mass ratio). To first order in J 15' the same decomposition applies to the hadronic mass operator, M, and one can obtain in this way a simple generalization of broken SU(3) mass formulae to broken SU(4).