Event Structure in Collider and Cosmic Ray Experiments
Hadronic interactions have been studied in cosmic ray experiments for a long time, and many of the important discoveries were made in those experiments. With the development of accelerators, systematic study of hadronic interactions have been carried out with beams of selected type of particles of well defined energies. Every new step towards higher energy has restricted the scope of cosmic ray experiments. The fact that cosmic rays are the source of highest available energy has been an important motivation for continuing the study of hadronic interactions at higher and higher energies with modified or new experiments. Figure 1 shows the energy regions covered by different cosmic ray techniques. Also indicated are the energy regions covered by ISR and the CERN SPS \(p\bar p\) collider. Cosmic ray experiments have two important limitations. Firstly, the energy and the type of cosmic ray particles cannot be controlled; and, secondly, the flux of primary cosmic rays falls off very rapidly with increasing energy. Figure 2 shows the integral flux of primary cosmic rays in the energy region 1012 eV – 1020 eV. In the face of these limitations, the efforts to cover higher energies lead to larger detectors or fewer events or going over to a new technique which provides more indirect information.
KeywordsHadronic Interaction Charged Multiplicity Hadronic Shower Emulsion Chamber Average Charged Multiplicity
Unable to display preview. Download preview PDF.
- 2.V. I. Yokovlev et al., 15th ICRC (1977) Vol. 7, page 115 and 16th ICRC (1979)Google Scholar
- V. I. Yokovlev et al., 15th ICRC (1977) Vol. 6, page 59.Google Scholar
- 4.J. D. Bjorken and L. D. McLerran, Phys. Rev. D20 (1979) 2353.Google Scholar
- D. G. Sutherland, Proc. Conf. on Cosmic Rays and Particle Physics, Bartol (1978) page 503.Google Scholar
- 5.Pamir Collaboration, Mt. Fuji Collaboration and Chacaltaya Collaboration, Nucl. Phys. B191 (1981) 1.Google Scholar
- 6.L. T. Baradzei et al., Preprint FLAN No. 103 and 104 (1974)Google Scholar
- L. T. Baradzei et al., Acta Univ. Lodz Ser. II No. 60 (1977) 51.Google Scholar
- 7.Brazil-Japan Emulsion Chamber Collaboration, 16th Int. Cosmic Ray Conference (1979) Vol. 6, page 350.Google Scholar
- 8.Brazil–Japan Emulsion Chamber Collaboration, 17th ICRC (1981) HE 3–2–28.Google Scholar
- 9.S. Hasegawa, private communication.Google Scholar