Finite W-Boson Mass Effect and Background in Neutrino Counting Reaction : Particles and Fields

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概要

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• The neutrino counting reaction e^+e^-⇾νν^^-γ is analyzed by calculating the W-exchange diagrams exactly. Around the Z-boson peak the difference between the exact calculation and the calculation in the point interaction approximation (PIA) of the W-boson contribution is less than a few percent in the total cross section. By making use of the Fierz transformation it is shown that the QED correction to the W-contribution and the interference in PIA is the same form as that to the Z-contribution. The distributions of Z-boson and W-boson contributions in PIA with the QED correction are compared with those of the main background e^+e^-⇾ e^+e^-γ under various kinematical cuts. When the energy is fairly above the Z-boson peak and some reasonable cuts are made, the neutrino counting is really feasible by using any of energy, transverse momentum and angular distributions. At the energy slightly above the Z-boson peak the neutrino counting can be made possible only by the photon transverse momentum distribution.

• 理論物理学刊行会の論文
• 1989-12-25

著者

• TOBIMATSU Keijiro

  Faculty of General Education,Meiji-Gakuin University

• NAKAZAWA Nobuya

  Department of Physics,Kogakuin University

• Nakazawa N

  High Energy Accelerator Res. Organization (kek) Tsukuba Jpn

• Tobimatsu Keijiro

  Center For Information Science Kogakuin University

• Igarashi M

  Tokai Univ. Hiratsuka

• Igarashi Masataka

  Department Of Phvscis Tokai University

• Nakazawa Nobuya

  Department Of Physics University Of Tokyo

• NAKAZAWA Naohito

  Department of Physics, Shimane University

• TOBIMATSU Keijiro

  Faculty of General Education, Meiji-gakuin University

• TOBIMATSU Keijiro

  Department of Physics, Kogakuin University

• NAKAZAWA Nobuya

  The Physics Laboratories, Harvard University

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