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Heavy Quark Mesons

  • Claude Amsler
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 949)

Abstract

The Jψ resonance was discovered at Brookhaven National Laboratory (BNL) and at SLAC in November 1974. The 30 GeV protons from BNL’s alternating-gradient synchrotron impinged on a beryllium target and new particles decaying into e+e pairs were searched with two magnetic spectrometers. Electrons and positrons were selected by Čerenkov hydrogen gas counters. A narrow peak—dubbed J—was observed around the e+e mass of 3100 MeV in the reaction pBe → JX, J → e+e (Fig. 8.1, left).

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Claude Amsler
    • 1
    • 2
  1. 1.Stefan Meyer InstituteAustrian Academy of SciencesViennaAustria
  2. 2.Physics InstituteUniversity of ZurichZurichSwitzerland

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