The muon (g − 2) experiment at BNL has completed four data runs for the positive muon, beginning in 1997 and has just finished its first run for the negative muon. Recently the analysis of a 1.3 ppm result based on the 1999 run was completed and published (aμ+ = 11 659 202(14)(6) × 10). The result shows a tantalizing discrepancy with the Standard Model prediction of 2.6 times the combined exper...

I consider the process μ+μ− → eν̄W+ in the case when the effective mass of the (eν̄) system than the muon mass. In this case the momentum transferred from the initial muon to the eν̄ system (the virtual neutrino momentum) can be both time–like and space–like. Since the path of integration over k2 goes through a pole at k2 = 0, it gives a divergent cross section. In the ideal case of large enough b...

With a good-resolution mountain profile, we simulated the underground muon flux at the Daya Bay site. We modified the standard Gaisser’s formula to describe the muon flux at the sea-level. At large zenith angle or small muon energies, which may be important in the Daya Bay case, the modified formula describe the experimental data much better than the standard one. MUSIC code was used to transpo...

As one of the figures of merit, muon polarization and its correlation to the particle arrival time was studied for the high intensity muon beam source of a Neutrino Factory. Muon polarization, 100% polarized in the parent pion rest system, was tracked down the pion capture, phase rotation, and ionization cooling channels, using the BMT equation. A study was done of the dependence of the muon po...

An overview (but not comprehensive) list of intense slow muon physics programs at a future neutrino factory, ranging from particle physics, nuclear physics to applications, is given in Table 1, where programs are categorized into three groups, (1) precision measurements, (2) search for rare processes, and (3) application. Among the particle physics programs with muons [1], very important are (a...

Utilizing only the vertical muon intensity of the Gaisser parameterization of the muon flux at the surface and propagating this energy spectrum underground according to statistical ionization and radiative energy losses, it is possible to calculate the underground muon intensity Crouch curve. In addition, the primary spectral index of the Gaisser parameterization can be adjusted from E to E sim...

The eventual prospect of muon colliders reaching several TeV encourages us to consider the experimental opportunities presented by very copious stores of muons, approaching 10 per year. I summarize and comment upon some highlights of the Fermilab Workshop on Physics at the First Muon Collider and at the Front End of a Muon Collider. Topics include various varieties of μμ colliders, μp colliders...

Conceptual design studies are underway for muon colliders and other high-current muon storage rings that have the potential to become the first true “neutrino factories”. Muon decays in long straight sections of the storage rings would produce precisely characterized beams of electron and muon type neutrinos of unprecedented intensity. This article reviews prospects the for these facilities to ...

The prospects for a muon collider operated as a Higgs factory are reviewed. The large muon mass means that the s-channel Higgs production mechanism is available, and simultaneously suppresses bremsstrahlung so that the beam energy spread can be kept to the MeV level required to exploit this. Thus this is the only machine which can make a direct scan over the Higgs resonance, and make an extraor...

Searches for new physics using muons are reviewed. Particular attention is paid to muon number non-conserving processes, like the decay μ → eγ and muon–electron conversion in muonic atoms. Also, experimental determinations and theoretical predictions for the muon anomalous magnetic moment are reviewed. Muons were first observed in cosmic ray detectors in 1936 [1, 2]. However, for several follow...