DOCSLIB.ORG

Well Behaved Hyperons

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Well Behaved Hyperons To hit a resonance spot-on, the Detection of a J/psi (decaying into an electron-positron pair) in the experiment at Well behaved antiproton beam can either be accel­ the CERN Intersecting Storage Rings (ISR) erated using the r.f. phase displace­ using a stored antiproton beam incident on hyperons ment method, or can be adjusted a hydrogen gas jet target. For this In her review talk on weak decays at experiment only one of the ISR rings is used. smoothly (but more slowly) using the the Brighton Conference, Cecilia momentum cooling system. With Jarlskog paid tribute to the excellent 3 m A of circulating antiprotons and a posed quark spins (like the eta-c) work of the Bristol/Geneva/Heidel­ design figure target density of which can decay into pairs of gamma berg / Orsay / Rutherford / Stras­ 6x1013 atoms/cm2, proton-anti- rays. bourg collaboration's experiment at proton collision luminosity was In the initial data samples, the pro­ CERN (WA2). This thorough high 1.5 x 1030 cm"2 s1. duction of chis appears to be a bit statistics study of the weak semi- After initial success with the J/psi, lower than expected, but it is too ear­ leptonic decays of heavy baryons attention turned to other particles. ly to draw firm conclusions. Addi­ (hyperons) has produced decisive re­ The J/psi and heavier counterparts tional data from runs next year will sults. consist of a charmed quark and anti- shed further light on these states. Each hyperon type corresponds to quark bound together with their The high 'tunability' of the machine a different mixture of quarks and spins parallel, but carrying no relative might enable other narrow states to within the accepted SU3 classifica­ angular momentum. Other particles be encountered. There has been talk tion of particles, their semi-leptonic (chis) have a similar quark spin confi­ recently of candidate Higgs particles decays can be described according guration, but carry one unit of orbital lying in the region. The systematic to an elegant model proposed by angular momentum. They are recog­ energy sweeps available from the Nicola Cabibbo in 1963 with only nized by their decays into electron- ISR should enable a thorough search three parameters: the Cabibbo angle positron pairs (from J/psis) plus a to be made, providing a fitting con­ 0C and two 'transition elements' F gamma ray. Also possible are the clusion to the physics career of this and D. At the time only three quark 'singlet' charmonium states with op- wonderful machine. flavours were known, but the ideas 418 CERN Courier, December 1983 Hyperon semi-leptonic decays in good shape. Apart from the case of free neutron decay (n p) all the data come from the WA2 experiment at CERN. According to the Cabibbo theory, the lines should intersect at one point. The centre of the small black ellipse is the best estimate of the common point of intersection of the lines, and the size of the ellipse indicates the experimental uncertainties. This is the best evidence so far for the correctness of the Cabibbo model, applied to so many different particle systems. The shaded bands represent experimental errors. pious non-leptonic hyperon decays. The WA2 experiment has looked at an extensive list of semi-leptonic decays of ksi, sigma and lambda hy­ perons. For several of the decays considered, precision reached the level at which radiative effects due to emission and absorption of photons had to be taken into account. For each semi-leptonic decay the rate and the decay distributions give independent relations between the three parameters F, D and sin 6C. Powerful additional constraints on the parameters of the model come from experiments on free neutron decay. The results from the WA2 experiment, whether considered alone or with the addition of the neutron decay constraints, are in complete accord with the Cabibbo model. Accelerator School successfully launched have been extended to cover the charged particles produced in the The first course of the newly created conventional six-quark picture of to­ forward direction by the interaction CERN Accelerator School under the day. of the 210 GeV SPS proton beam on leadership of Kjell Johnsen was held A major problem in previous tests a target. A 'DISC Cherenkov counter at CERN from 11-21 October. Its of the Cabibbo model had been the identified different kinds of hyperons subject, 'Antiprotons for Colliding necessity to combine data from (sigmas and ksis), about four per Beam Facilities', was selected ob­ many different experiments ana­ thousand charged beam particles. viously in the light of the recent spec­ lysed under a variety of assumptions Wire chambers on either side of the tacular achievements in this field. which were liable to produce incon­ DISC particle identifier accurately The School will be back-tracking in sistent results. The objective of the measured the directions of the parti­ its next planned course in September WA2 experiment was to make a co­ cles enabling their momenta to be 1984 with a basic course on acceler­ herent, comprehensive and precise measured to within one per cent. ator physics accessible to post-uni­ Study of the various hyperon semi- Downstream of the DISC was a versity science and engineering stu­ leptonic decays measured in a single 10-metre long helium-filled decay re­ dents. apparatus, and to see how the re­ gion, followed by a magnetic spec­ The School has several aims in the sults compared with the Cabibbo trometer which measured the general context of broadening the model. charged particles emitted in the hy­ base of accelerator physics knowl­ One of the unique features of the peron decays. An impressive arsenal edge in Europe. There is need to initial experimental programme at of detectors, including a lead-glass attract young people into this field, the CERN SPS super proton synchro­ array, a gas Cherenkov counter, particularly with the tremendous tron when it began operations in transition radiation detectors and a challenge of mastering new acceler­ 1976 was its high energy charged lead scintillator shower counter iden­ ation techniques so as to be able to hyperon beam. A magnetic channel, tified electrons. Together these de­ continue the advance of high energy short so as to minimize the hyperon tectors provided excellent discrimi­ physics into the next century. In addi­ decay losses, selected 100 GeV nation against the much more co­ tion, accelerator physics has increas- CERN Courier, December 1983 419 .
Load more

Recommended publications
  • 1991 HEPP Conference: LEP Precision Is Main Feature
    1991 HEPP Conference ments of heavy quarks and τ leptons [τb = (1.33 ± 0.05 ± 0.06).10 -12 s, ττ = (302.5 ± 5.9).10-12 s] from various experiments LEP Precision is Main Feature now agree. Furthermore, the new data have improved the knowledge of the Cabbibo- Kobayashi-Maskawa matrix elements. The The Divisional Conference of the High J. Carter summarized precision tests of way CP violation is achieved in nature still Energy and Particle Physics Division takes the standard model and the following set of remains an open question. Two experiments place every two years. As the IUPAP Lepton- measurements serves as an example of the at CERN and at Fermilab, employing neutral Photon Symposium was due to be held in high level of accuracy with which the funda­ kaon beams, do not yet allow a conclusive Europe, it was felt that one should accom­ mental parameters for electroweak inter­ answer to the size of the CP violating para­ modate the large overlap in physics topics actions have been determined : meter Re (ε'/ε), but new experiments with a with the EPS High Energy Physics Confe­ higher accuracy are planned (J.M Gerard). rence by organizing only one meeting in The four LEP experiments have also Geneva. The 1991 Conference was thus searched for new phenomena beyond the organized jointly by EPS, IUPAP and CERN, standard model and, In particular, have and took place in the Geneva Conference The electroweak Z parameters have been looked for the appearance of new particles. Centre with over 1000 participants from used to evaluate the number of light neu­ M.
    [Show full text]
  • The Charm of Theoretical Physics (1958– 1993)?
    Eur. Phys. J. H 42, 611{661 (2017) DOI: 10.1140/epjh/e2017-80040-9 THE EUROPEAN PHYSICAL JOURNAL H Oral history interview The Charm of Theoretical Physics (1958{ 1993)? Luciano Maiani1 and Luisa Bonolis2,a 1 Dipartimento di Fisica and INFN, Piazzale A. Moro 5, 00185 Rome, Italy 2 Max Planck Institute for the History of Science, Boltzmannstraße 22, 14195 Berlin, Germany Received 10 July 2017 / Received in final form 7 August 2017 Published online 4 December 2017 c The Author(s) 2017. This article is published with open access at Springerlink.com Abstract. Personal recollections on theoretical particle physics in the years when the Standard Theory was formed. In the background, the remarkable development of Italian theoretical physics in the second part of the last century, with great personalities like Bruno Touschek, Raoul Gatto, Nicola Cabibbo and their schools. 1 Apprenticeship L. B. How did your interest in physics arise? You enrolled in the late 1950s, when the period of post-war reconstruction of physics in Europe was coming to an end, and Italy was entering into a phase of great expansion. Those were very exciting years. It was the beginning of the space era. L. M. The beginning of the space era certainly had a strong influence on many people, absolutely. The landing on the moon in 1969 was for sure unforgettable, but at that time I was already working in Physics and about to get married. My interest in physics started well before. The real beginning was around 1955. Most important for me was astronomy. It is not surprising that astronomy marked for many people the beginning of their interest in science.
    [Show full text]
  • Doing Electroweak Physics with Roberto
    IL NUOVO CIMENTO 40 C (2017) 153 DOI 10.1393/ncc/i2017-17153-y Colloquia: PRZ Memorial Doing electroweak physics with Roberto ∗ Luciano Maiani(1)(2)(3)( ) (1) INFN, Sezione di Roma - Roma, Italy (2) Dipartimento di Fisica, Universit`adiRoma-Roma,Italy (3) CERN - Gen`eve, Switzerland received 27 November 2017 Summary. — Friendship and Collaboration with Roberto, while the Standard Theory was unfolding under our eyes. At the end of the sixties, dual models dominated the scene as the theory of strong interactions. However, the years 1971-1973 brought decisive discoveries [1]. • 1971, ’t Hooft and Veltman showed that the Weinberg-Salam theory is renormalisable; • 1972, Bouchiat, Iliopoulos and Meyer proved the cancellation of Adler anomalies in the electroweak theory with four quarks. In a letter from John, there must be charm, quarks have color and are fractionally charged; • 1973 the discovery of neutral currents by Gargamelle at CERN; • ... and in the same year came the discovery of asymptotic freedom of the Yang-Mills theory by Gross and Wilczeck and Politzer. Shortly after, the idea of color interaction of quarks was put forward by Fritzsch, Gell-Mann and Leutwyler. In three years, the paradigm of particle interactions shifted completely towards field theory, a shining example of what Thomas Kuhn in 1962 had called a scientific revolution. In 1974, the discovery of the J/Ψ opened another chapter: heavy fermions, initiated with charm and later continued with the heavy lepton, beauty and top. The Standard Theory was taking form, everybody became electroweak & free, at least asymptotically. ∗ ( ) E-mail: [email protected] Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0) 1 2 LUCIANO MAIANI 1.
    [Show full text]
  • Nicola Cabibbo E + E- Colliding Beam Experiments (1961)
    covered by P. Jenni, who quoted test beam measurements with a spatial resolution down to 20 µm : detectors with such a reso­ lution would be used for lifetime measure­ ments at colliders. Passive Experiments New results from non-accelerator experi­ ments gave rise to animated discussions. The observed flux of energetic solar neutri­ nos seems to be significantly lower than model calculations would predict. If this is verified, the observations could be the first hint of a new physics beyond the standard From the left, W. Schmidt-Parzefall, P. model. It therefore remains Important to Professor Y. Yamaguchi, IUPAP President- Schlein and B.H. Wiik in front of the EPS measure the neutrino flux from the sun with Designate, with Dr. B. Richter, Director of stand at the 1991 LP-HEP Conference. low threshold detectors (first generation SLAC, seated in the background. detectors using a chloride solution only some extent at LEP and in heavy ion colli­ measured 8Be and 7B fluxes in the solar a 51Cr source, the measured flux was low sions at CERN-SPS and later at RICH. He neutrino spectrum). Two experiments with (< 79 Solar Neutrino Units — SNU — at underlined the importance of supercompu­ Ga as the detector medium (GALLEX and 90% confidence limits) as compared to the ter calculations at APE in Rome and infor­ SAGE) are on the verge of obtaining data theoretically predicted rate of 132 SNU. mation on the spectroscopy of bound ha­ within the next few years. SAGE In the Finally, two new experiments are In prepara­ dronic states from LEAR and planed e + e- USSR involving 60 t of metal rather than a tion (BOREX and SNOW) for measuring the colliders.
    [Show full text]
  • The Scientific Legacy of Nicola Cabibbo
    The scientific legacy of Nicola Cabibbo Guido Martinelli Workshop of LHC Higgs Cross Section Working Group 4-5 November 2010 Fernando Ferroni, UK, September 6-10, 2010 Nicola Cabibbo • Let me thanks the organizers for the great honour - and responsability - of commemorating our dear colleague and friend Nicola Cabibbo at this workshop • I apologize in advance for possible mistakes and inaccuracies due to, me, being a poor experimentalist Father of Flavor Physics CKM 2006 Nagoya Nicola Cabibbo, Makoto Kobayashi and (but for one) young italian physicists personal interlude (1) when the Nobel Prize was awarded to KM, one of the young people sent the photo to Nicola by e-mail saying : ‘it won’t repay you from the frustration but perhaps you might smile at it’ Nicola replied ‘ I am not sad at all. I am happy at looking at how many good things you, that were students of mine, are doing around the world’ Nagoya CKM 2008 The story of the hyperons decay and of a friendship to last A close friendship with P. Franzini (see later !) Nicola, why don’t you do something fundamental! A beautiful mind The son of a sicilian lawyer, Nicola Cabibbo, born in Roma on April 10, 1935, lived his childhood during the second world war. During these difficult years, Nicola discovered astronomy and developed a strong interest in the construction of radio devices. This was the starting point of a life-long interest and an extraordinary skill in the realization of hardware, including the mirror of a telescope and a home made personal computer - the first of a series - at the beginning of the `80.
    [Show full text]
  • Varenna 2017
    From Quarks to Pentaquarks: a journey in Gatto’s and Cabibbo’s schools Luciano Maiani Roma Sapienza, INFN and CERN Varenna. Passion for Physics, 24/06/2017 L. Maiani. From Quarks to Pentaquarks 1. Introduction & Disclaimer • Italian physics, in the second part of 1900, has lived an exceptional period of development, achievements and international recognition; •this is true in particular for Theoretical Physics: several schools flourished in (from North to South): Torino, Milano, Padova, Genova, Bologna, Firenze, Roma+Frascati, Napoli, Bari, Lecce, Catania, led by interesting personalities •too many to be recorded now, with the risk of important omissions. • The Via Panisperna years and the years of reconstruction after the war have been amply described by Edoardo Amaldi, Emilio Segre’ and many others. •There (not yet?) a systematic historical reconstruction of the years from 1954 (INFN, Frascati and CERN establishment) to today: sixty crucial years, worth of an historical study of what happened in the Italian physics •In my talk I shall follow my recollections, centered on the Schools that Gatto and Cabibbo created in Firenze and Roma, whom I participated personally, • and following the evolution of quark theory, which eventually led to the Standard Theory we know today • Much of the material will appear in a long interview by Luisa Bonolis for EJP-History • DISCLAIMER: this is not a systematic hystorical recostruction •comments, unhappinesses and suggestions are welcome! Varenna. Passion for Physics, 24/06/2017 L. Maiani. From Quarks to Pentaquarks muon strange particles Δ++ ..... composite by “constituents” which are more elementary ? S-matrix, bootstrap, nuclear Fermi&Yang’s proposal: democracy? + particles are all on an equal footing: π = pn¯ poles in S-matrix, solutions of self- related by a large symmetry? consistency equations possibly including spin ? Varenna.
    [Show full text]
  • Via Panisperna Boys”: the Role of Ettore Majorana
    JCOM 1 (3), September 2002 Science Communication and the “via Panisperna boys”: the Role of Ettore Majorana Angelo Mastroianni Università degli Studi “La Sapienza” di Roma Enrico Fermi’s work gave birth to a real cultural revolution in the Italian scientific scenario. His scientific studies concerned almost every field in physics and had far-reaching effects of which virtually everybody, above all in Italy, is still taking advantage. Two important “by-products” of Fermi’s ideas and initiatives will be here taken into consideration: the new way of carrying out research and communicating science invented by Fermi and his group and his publications for the general public, which often stood for high examples of scientific popularisation. Then the focus will shift on Ettore Majorana’s role to try to understand why his work in the field of communication within the School of Physics of Rome was basically non-existent despite the excellent communicative skills he demonstrated both during his university lectures – also published in this magazine – and in his article “Il valore delle leggi statistiche nella fisica e nelle scienze sociali” [20], the only one which does not deal with pure physics issues and which will be also taken into account in this paper Fermi’s Cultural Revolution In the first thirty years of the 1900s, two important innovations were introduced in the field of modern physics: the theory of relativity and quantum mechanics. The promoters of both these changes were born or worked in Central Europe, except Gregorio Ricci Curbastro and Tullio Levi Civita (Italy), Satyendra Nath Bose (India), Arthur Holly Compton and Alfred Landè (USA, but the latter 1 was of German origin).
    [Show full text]
  • INTRODUCTION to BEACH 2012 Roland Winston
    INTRODUCTION TO BEACH 2012 Roland Winston Schools of Natural Science and Engineering, University of California Merced Director, California Advanced Solar Technologies Institute (UC Solar) [email protected] http://ucsolar.org I have been asked by the organizers to place Nicola Cabibbo’s contributions to hyperon physics in perspective. ------ Also to substitute for Leon Lederman. I have some hope to fulfill the first assignment, but little hope for the second. All I can do is recall my first encounter with Leon. I was a Chicago grad student attending a conference at Argonne Lab. Chicago and Columbia were famously rivals, each having their own cyclotron. Val Telegdi (my thesis sponsor ) was first speaker, Leon second, and Yoichiro Nambu third. When it was Leon’s turn he began: “I feel like a piece of ham - sandwiched as I am between two such well-bred speakers”. The audience roared with laughter--- for me the ice was broken. “I feel like a piece of ham sandwiched as I am between two such well-bred speakers”. In 1999 I made a visit to Nicola in Rome, arranged by a mutual friend Cesare Silvi, then President of ISES. (Nicola had been director of INEA) This began a friendship that lasted over a decade. Every trip to Rome would start with a cultural experience and a “lesson”. This one was a visit to his office in the Vatican. Nicola Cabibbo’s Vatican Office It has been two years since the we lost Nicola Cabibbo; A long time in the life of a physicist, but a short time to form a perspective on a scientists contributions It takes more like 50 years to assess contributions to science (S, Chadrasekhar, private communication) In what follows I will use Nicola’s words whenever possible, even though he was writing in the third person.
    [Show full text]
  • User:Guy Vandegrift/Timeline of Quantum Mechanics (Abridged)
    User:Guy vandegrift/Timeline of quantum mechanics (abridged) • 1895 – Wilhelm Conrad Röntgen discovers X-rays in experiments with electron beams in plasma.[1] • 1896 – Antoine Henri Becquerel accidentally dis- covers radioactivity while investigating the work of Wilhelm Conrad Röntgen; he finds that uranium salts emit radiation that resembled Röntgen’s X- rays in their penetrating power, and accidentally dis- covers that the phosphorescent substance potassium uranyl sulfate exposes photographic plates.[1][3] • 1896 – Pieter Zeeman observes the Zeeman split- ting effect by passing the light emitted by hydrogen through a magnetic field. Wikiversity: • 1896–1897 Marie Curie investigates uranium salt First Journal of Science samples using a very sensitive electrometer device that was invented 15 years before by her husband and his brother Jacques Curie to measure electrical Under review. Condensed from Wikipedia’s Timeline of charge. She discovers that the emitted rays make the quantum mechanics at 13:07, 2 September 2015 (oldid surrounding air electrically conductive. [4] 679101670) • 1897 – Ivan Borgman demonstrates that X-rays and This abridged “timeline of quantum mechancis” shows radioactive materials induce thermoluminescence. some of the key steps in the development of quantum me- chanics, quantum field theories and quantum chemistry • 1899 to 1903 – Ernest Rutherford, who later became that occurred before the end of World War II [1][2] known as the “father of nuclear physics",[5] inves- tigates radioactivity and coins the terms alpha and beta rays in 1899 to describe the two distinct types 1 19th century of radiation emitted by thorium and uranium salts. [6] • 1859 – Kirchhoff introduces the concept of a blackbody and proves that its emission spectrum de- pends only on its temperature.[1] 2 20th century • 1860–1900 – Ludwig Eduard Boltzmann produces a 2.1 1900–1909 primitive diagram of a model of an iodine molecule that resembles the orbital diagram.
    [Show full text]
  • Neutral Currents: a Perfect Experimental Discovery
    CERN Courier September 2013 Anniversary Neutral currents: A perfect experimental discovery Forty years after the observation of weak neutral currents at CERN, Luciano Maiani reflects on their impact. In a seminar at CERN on 19 July 1973, Paul Musset of the weak neutral currents. A month later, Gerald Myatt presented the Fig. 1. A hadronic neutral current event, where the interaction of results on a global stage at the 6th International Symposium on Elec- the neutrino from the left produces three secondary particles, all tron and Photon Interactions at High Energies in Bonn. By then, two Physics Let- in the liquid. There is no charged lepton. ters and were published together on 3 September. A few days later, Europhysics Conference on High-Energy Particle Physics, where Earlier in May, Luciano Maiani was with Nicola Cabibbo at their what the Gargamelle collaboration had found in photographs of neu- the signature of a hadronic weak neutral current. In addition they had The main problem facing the collaboration was to be certain that - ated in interactions in the material surrounding the bubble chamber (CERN Courier coming from the left knocks an electron forwards, creating a characteristic shower of electron–positron pairs. - - today’s Standard Model of particles and their interactions, he says. - charge between the particles concerned, are the manifestation of ticles compared with muons and neutrons. His solution, formulated - weak interaction together with the charged bosons, W. The dis- fundamental particles emerge but other elements of today’s Stand- 53 CERN Courier September 2013 Anniversary Caption caption caption caption caption. theory. Their idea was based on a simple analogy between the weak hadronic and leptonic currents.
    [Show full text]
  • Nicola Cabibbo, Physicist and Science Manager\*
    EPJ Web of Conferences 24, 00002 (2012) DOI: 10.1051/epjconf/ 20122400002 C Owned by the authors, published by EDP Sciences SIF, 2012- Nicola Cabibbo, Physicist and Science Manager∗ L. Maiani Dipartimento di Fisica, Universit`adi Roma La Sapienza - P.le A. Moro 1, 00185 Roma, Italy This commemoration of the outstanding scientist Nicola Cabibbo was first presented on 25 October 2010, soon after he passed away, at the Accademia dei Lincei in Rome as opening lecture of the Conference on Environmental Radioactivity – New Frontiers and Developments. It was then delivered as a talk at Pennsylvania University, Philadelphia, April 27, 2011, on the oc- casion of the B. Franklin Prize 2011, attributed to Nicola Cabibbo, “for his key contributions to understanding the symmetries underlying the decays of elementary particles by weak interactions”. In the present form it is also published in La Rivista del Nuovo Cimento. [Note of the Editors.] Abstract Universality of the weak interactions is reviewed, with special em- phasis on the origin of the Cabibbo theory of strange-particle β- decays and its role in the discovery of the unified Electroweak The- ory. Achievements and present challenges of the Standard Theory of particles interactions are briefly illustrated. As a homage to Nicola Cabibbo, his leading role in the Roma school of theoretical physics and in the Italian science in general is reviewed. ∗ Extracted from “Universality of the Weak Interactions, Cabibbo theory and where they led us”, La Rivista del Nuovo Cimento 34 (2011) 679-692, c Societ`a Italiana di Fisica, 2011. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
    [Show full text]
  • The Young Cabibbo Luciano Maiani Sapienza Università Di Roma and INFN
    The Young Cabibbo Luciano Maiani Sapienza Università di Roma and INFN NICOLA CABIBBO Memorial Symposium Laboratori Nazionali di Frascati dell’INFN 15 Dicember 2020 Cabibbo Memorial Symposium, 15/12/2020 Luciano Maiani 1 Particle Physics in transition Accelerators take over 1953. Cosmic Rays Conference in France The news, just arrived, of recent experiments at the Cosmotron did not create surprise or preoccupation… C. F. Powell (who had discovered the true Yukawa meson, the pion) commented, “Gentlemen, we have been invaded . the accelerators are here,” 1957. Padua-Venice Conference, Italy ... T. D. Lee gave a talk on weak interactions...the two- component ...neutrino theory and ... lepton conservation; Bruno Touschek, ...proposed that a suitable gauge transformation of the neutrino field, imposed to keep mν = 0, leads to two-component neutrinos…elaborated on the equivalence of two-component and Majorana neutrinos. Marshak & Sudarshan stated, contrary to the then- current experimental evidence, that all weak interactions are of type V-A with GV ≃ GA, lepton conservation is incorporated, two component neutrinos (R. Feynman: after 23 years, we come back to Fermi, except for the factor (1-γ5)!… and for the suppression of ΔS = 1 decays) The suggestion was made that weak interactions are mediated by charged vector bosons, W ±. Cabibbo Memorial Symposium, 15/12/2020 Luciano Maiani 2 1. The beginning • graduated in 1958, mentor Bruno Touschek • meets Raoul Gatto (5 years elder) in Roma who was coming back from Berkeley, at Physics Institute, Roma, 1959; •first thoretical physicist in Frascati, hired by G. Salvini, continues to work with Gatto, Director of the Frascati theory group; • exciting times in Frascati: e+ e- collider AdA, later Adone, new particles (the eta meson), SU(3), etc.
    [Show full text]