Narrow muon bundles in underground detectors permit to study muoproduction reactions that take place in the surrounding rock. We analyze the relevance of a QED+QCD reaction, muoproduction of “open charm”. The contribution to double muon events is estimated to be 4−8% of the one due to QED “trident” process, for an ideal detector located under a rock depth of 3 km water equivalent, and an observ...

In the context of the 2013 APS-DPF Snowmass summer study conducted by the U.S. HEP community, this white paper outlines a roadmap for further development of Micro-pattern Gas Detectors for tracking and muon detection in HEP experiments. We briefly discuss technical requirements and summarize current capabilities of these detectors with a focus of operation in experiments at the energy frontier ...

At low temperatures, spin dynamics in ideal spin ice is due mainly to dilute, thermally excited magnetic monopole excitations. I consider how these will affect the dynamics of a nuclear spin (the same theory applies to muon spin resonance if implanted muons do not diffuse). Up to the time scale for nearby monopoles to be rearranged, a stretched-exponential form of the relaxation functions is ex...

Comparison of the new data for the negative muon capture in Si with the recent shell model calculations using a full 1s-0d model space and the USD empirical effective interaction and the one-nucleon weak current provides the induced pseudoscalar gP substantially smaller than the value predicted by PCAC and pion-pole dominance. We find that adding the effect from the one-pion exchange axial char...

The prospects are presented for measuring, in ATLAS, the spin density element, ρ00, of the Z and W bosons in WZ production. The analysis considers events where both W and Z decay leptonically via electron or muon channels. This is done by reconstructing the decay angle of the leptons in the Z and W rest frames. The fraction of longitudinally polarized Z’s and W ’s are extracted from the angular...

The combination of new cosmic microwave background data with cosmo-logical priors has determined the physical cold dark matter (cdm) density to be Ω cdm h 2 = 0.13 ± 0.01. We find the corresponding regions of parameters in the minimal supergravity model for which the lightest neutralino is the cdm particle. We then compare with the muon anomalous magnetic moment (a µ) measurement, the mass of t...

We investigate here a possibility for test Optical Stochastic Cooling (OSC) method at CESR. Feasible application of OSC and its variants for muon cooling makes this method valuable for further implementation in muon collider.

Recent data on e+/e− and p̄ cosmic rays suggest that dark matter annihilate into the standard model (SM) particles through new leptophilic interaction. In this paper, we consider a standard model extension with the gauged U(1)Lμ−Lτ group, with a new Dirac fermion charged under this U(1) as a dark matter. We study the muon (g − 2)μ, thermal relic density of the cold dark matter, and the collider ...

I give a brief overview of the physics potential of short baseline experiments at neutrino factories, i.e. facilities providing high energy and high intensity neutrino beams, like the one planned to be built in connection with the proposed high energy muon storage ring. These facilities would offer a unique opportunity to perform new precision studies of QCD and electroweak interactions. New ty...