Now showing items 1-10 of 77
Leptonic CP violation search and the ambiguity of delta m(31)(2)
(American Physical Society, 2006-03)
We consider a search for the CP-violating angle delta(CP) in long baseline neutrino oscillation experiments. We show that the subleading delta(CP)-dependent terms in the nu(mu)->nu(e) oscillation probability can be easily ...
Thermal production of axions in the Earth
(American Physical Society, 2009-05)
We estimate the production rate of axion-type particles in the core of the Earth, at a temperature T approximate to 5000 K. We constrain thermal geo-axion emission by demanding a core-cooling rate less than O(100) K/Gyr, ...
Transient pulses from exploding primordial black holes as a signature of an extra dimension
(Iop Publishing Ltd, 2008-11-01)
Multiwavelength campaign on Mrk 509 I. Variability and spectral energy distribution
(EDP Sciences, 2011-10)
Context. Active galactic nuclei (AGN) show a wealth of interesting physical processes, some of which are poorly understood. In a broader context, they play an important role in processes that are far beyond their immediate ...
Simultaneous XMM-Newton and HST-COS observation of 1H0419-577 The absorbing and emitting ionized gas
(EDP Sciences, 2013-08)
In this paper we analyze the X-ray, UV, and optical data of the Seyfert 1.5 galaxy 1H0419-577 with the aim of detecting and studying an ionized-gas outflow. The source was observed simultaneously in the X-rays with XMM-Newton ...
Constraints on R-parity violating couplings from CERN LEP and SLAG SLD hadronic observables
(American Physical Society, 2000-07-01)
We analyze the one loop corrections to hadronic Z decays in an R-parity violating extension to the minimal supersymmetric standard model. Performing a global fit to all the hadronic observables at the Z peak, we obtain ...
Search for massive neutrinos in the decay pi -> e nu
(American Physical Society, 2011-09-06)
Evidence of massive neutrinos in the pi(+) -> e(+)nu decay spectrum was sought with the background pi(+) -> mu(+) -> e(+) decay chain highly suppressed. Upper limits (90% C. L.) on the neutrino mixing matrix element vertical ...
XMM-Newton unveils the complex iron K alpha region of Mrk 279
(EDP Sciences, 2010-03-04)
We present the results of a similar to 160 ks-long XMM-Newton observation of the Seyfert 1 galaxy Mrk 279. The spectrum shows evidence of both broad and narrow emission features. The FeK alpha line may be equally well ...
Quark-lepton unification and lepton flavor nonconservation from a TeV-scale seesaw neutrino mass texture
(American Physical Society, 2003-10-01)
In a recent paper we pointed out that the mixing of the light neutrinos with heavy gauge singlet states could reconcile the Z-pole data from e(+)e(-) colliders and the nu(mu) ((nu) over bar (mu)) scattering data from the ...
Charge assignments in multiple-U(1) gauge theories
(American Physical Society, 1999-12-01)
We discuss the choice of gauge field basis in multiple-U(1) gauge theories. We find that there is a preferred basis, specified by the charge orthogonality condition, in which the U(1) gauge fields do not mix under one-loop ...