33,277 research outputs found
Direct CP violation in charm at Belle
Using the full data sample collected with the Belle detector at the KEKB
asymmetric-energy collider, we have searched for CP violation of
charmed mesons in and
decays, where denotes and . We observe evidence for CP violation
in decay with 3.2 standard deviations away from
zero, , while the asymmetry is consistent with the
expected CP violation due to the neutral kaon in the final state. No evidence
for CP violation in is observed with
and
. The CP asymmetry difference between
and decays is also measured
with , which is 2.1 standard
deviations away from zero and supports recent LHCb and CDF measurements.Comment: Proceedings of the 36th International Conference on High Energy
Physics - ICHEP 2012; July 4-11 2012; Melbourne, Australi
First Axion Dark Matter Search with Toroidal Geometry
We report the first axion dark matter search with toroidal geometry.
Exclusion limits of the axion-photon coupling over the
axion mass range from 24.7 to 29.1 eV at the 95\% confidence level are set
through this pioneering search. Prospects for axion dark matter searches with
larger scale toroidal geometry are also given.Comment: Contributed to the 13th Patras Workshop on Axions, WIMPs and WISPs,
Thessaloniki, May 15 to 19, 201
A numerical study of diffusive shock acceleration of cosmic rays in supernova shocks
The evolution of the energy spectrum of cosmic rays accelerated by the first order Fermi mechanism, by a supernova remnant shock wave, including adiabatic deceleration effects behind the front, is carried out by means of a time-dependent numerical code. The calculations apply to the adiabatic stage (or Sedov stage) of the supernova explosion, and the energetic particle spectrum is calculated in the test particle limit (i.e., the back reaction of the cosmic rays on the flow is not included). The particles are injected mono-energetically at the shock. The radial distribution, The radial distribution, and the spectrum of the accelerated and decelerated particles is shown
- …