42 research outputs found
Enhanced Sensitivity to Dark Matter Self-annihilations in the Sun using Neutrino Spectral Information
Self-annihilating dark matter gravitationally captured by the Sun could yield
observable neutrino signals at current and next generation neutrino detectors.
By exploiting such signals, neutrino detectors can probe the spin-dependent
scattering of weakly interacting massive particles (WIMPs) with nucleons in the
Sun. We describe a method how to convert constraints on neutrino fluxes to a
limit on the WIMP-nucleon scattering cross section. In this method all neutrino
flavors can be treated in a very similar way. We study the sensitivity of
neutrino telescopes for Solar WIMP signals using vertex contained events and
find that this detection channel is of particular importance in the search for
low mass WIMPs. We obtain highly competitive sensitivities with all neutrino
flavor channels for a Megaton sized detector through the application of basic
spectral selection criteria. Best results are obtained with the electron
neutrino channel. We discuss associated uncertainties and provide a procedure
how to treat them for analyses in a consistent way.Comment: 21 pages, 6 figure
Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation
The current status of electric dipole moments of diamagnetic atoms which
involves the synergy between atomic experiments and three different theoretical
areas -- particle, nuclear and atomic is reviewed. Various models of particle
physics that predict CP violation, which is necessary for the existence of such
electric dipole moments, are presented. These include the standard model of
particle physics and various extensions of it. Effective hadron level combined
charge conjugation (C) and parity (P) symmetry violating interactions are
derived taking into consideration different ways in which a nucleon interacts
with other nucleons as well as with electrons. Nuclear structure calculations
of the CP-odd nuclear Schiff moment are discussed using the shell model and
other theoretical approaches. Results of the calculations of atomic electric
dipole moments due to the interaction of the nuclear Schiff moment with the
electrons and the P and time-reversal (T) symmetry violating
tensor-pseudotensor electron-nucleus are elucidated using different
relativistic many-body theories. The principles of the measurement of the
electric dipole moments of diamagnetic atoms are outlined. Upper limits for the
nuclear Schiff moment and tensor-pseudotensor coupling constant are obtained
combining the results of atomic experiments and relativistic many-body
theories. The coefficients for the different sources of CP violation have been
estimated at the elementary particle level for all the diamagnetic atoms of
current experimental interest and their implications for physics beyond the
standard model is discussed. Possible improvements of the current results of
the measurements as well as quantum chromodynamics, nuclear and atomic
calculations are suggested.Comment: 46 pages, 19 tables and 16 figures. A review article accepted for
EPJ