The differential and total cross sections for the scattering of muonic, pionic, kaonic and antipro-tonic hydrogen in excited states from atomic hydrogen have been calculated for the purpose of atomic cascade calculations. The scattering problem is treated in a fully quantum mechanical framework which takes the energy shifts and, in the case of the hadronic atoms, the widths of the ns states int...

We have previously analysed the chiral predictions for the decay KL → π γee and discussed how experimental measurements of this process can help our understanding of chiral theories and of CP tests. Motivated by the possibility that the analogous muonic process may soon be measurable, we extend this calculation to the decay KL → π γμμ. Branching ratios and differential branching ratios are calc...

The way a charm-quark fragments into a charmed hadron is a challenging problem both for the theoretical and the experimental particle physics. Moreover, in neutrino induced charmproduction, peculiar processes occur such as quasi-elastic and diffractive charm-production which make the results from other experiments not directly comparable. We present here a method to extract the charmed fraction...

The standard definition of the electromagnetic radius of a charged particle (in particular the proton) is ambiguous once electromagnetic corrections are considered. We argue that a natural definition can be given within an effective field theory framework in terms of a matching coefficient. The definition of the neutron radius is also discussed. We elaborate on the effective field theory releva...

The kinetic energy distribution of ground state muonic hydrogen atoms mup(1S) is determined from time-of-flight spectra measured at 4, 16, and 64 hPa H2 room-temperature gas. A 0.9 keV component is discovered and attributed to radiationless deexcitation of long-lived mu p(2S) atoms in collisions with H2 molecules. The analysis reveals a relative population of about 1%, and a pressure-dependent ...

The contribution of the α3 single electron-loop vacuum-polarization diagrams to the Lamb shift of the muonic hydrogen has been evaluated recently by two methods. One uses the exact parametric representation of the vacuum-polarization function while the other relies on the Padé approximation method. High numerical precision of these calculations enables us to examine the accuracy of the Monte-Ca...

Corrections of orders α5 and α6 are calculated in the hyperfine splittings of 1S and 2S energy levels in the ion of muonic helium. The electron vacuum polarization effects, the nuclear structure corrections and recoil corrections are taken into account. The obtained numerical values of the hyperfine splittings -1334.56 meV (1S state), -166.62 meV (2S state) can be considered as a reliable estim...

Some low-energy three-body muonand electron-transfer processes are considered within the Faddeev-Hahn formulation using two-, six-, and ten-state close-coupling approximation. We test our approach in bound-state problems for systems H2 and (μ dd) within sixand ten-state schemes, where d is a deuteron and μ a muon. We present results in the six-state model for muonium formation from hydrogen. We...

We have previously analysed the chiral predictions for the decay KL → π γee and discussed how experimental measurements of this process can help our undertanding of chiral theories and of CP tests. Motivated by the possibility that the analogous muonic process may soon be measureable, we extend this calculation to the decay KL → π γμμ. Branching ratios and differential branching ratios are calc...

Physics motivation and phenomenology of µ − e conversion (µ − + N(A, Z) → e − + N(A, Z)) in a muonic atom, which is one the most important muon process to search for lepton flavor violation of charged leptons, are presented. Prospects for future experiments at J-PARC (Japan Proton Accelerator Complex) in Japan, such as the COMET experiment for sensitivity of less than 10 −16 as the first stage ...