1,206 research outputs found
Non-universal gravitational couplings of neutrinos in matter
When neutrinos travel through a normal matter medium, the electron neutrinos
couple differently to gravity compared to the other neutrinos, due to the
presence of electrons in the medium and the absence of the other charged
leptons. The matter-induced gravitational couplings of the neutrinos under such
conditions are calculated and their contribution to the neutrino index of
refraction in the presence of a gravitational potential is determined.Comment: Latex, 10 page
Neutrino Energy Reconstruction and the Shape of the CCQE-like Total Cross Section
We show that because of the multinucleon mechanism effects, the algorithm
used to reconstruct the neutrino energy is not adequate when dealing with
quasielastic-like events, and a distortion of the total flux unfolded cross
section shape is produced. This amounts to a redistribution of strength from
high to low energies, which gives rise to a sizable excess (deficit) of low
(high) energy neutrinos. This distortion of the shape leads to a good
description of the MiniBooNE unfolded CCQE-like cross sections published in
Phys.Rev. D81 (2010) 092005. However, these changes in the shape are artifacts
of the unfolding process that ignores multinucleon mechanisms.Comment: 11 pages, 6 figures. Some references and comments adde
Una nueva especie afrotropical de Ormyrus Westwood, 1832 (Hymenoptera, Chalcidoidea, Ormyridae)
Anew species, Ormyrus fernandinus sp. n. (Hymenoptera, Chalcidoidea, Ormyridae), is described from the island of Bioko (Equatorial Guinea). Collected with Malaise trap, the biology of the new species is unknown. The differential morphological features of the new species with respect to known afrotropical Ormyrus species, and its phylogenetic relationships are discussed.Se describe una nueva especie, Ormyrus fernandinus sp. n. (Hymenoptera, Chalcidoidea, Ormyridae), de la isla de Bioko (Guinea Ecuatorial). La especie fue colectada con trampa Malaise por lo que se desconoce su biologÃa. Se discuten los caracteres distintivos fundamentales de la nueva especie en relación a las especies de Ormyrus conocidas en la region Afrotropical, y sus relaciones filogenéticas
Quark-mass dependence of baryon resonances
We study the quark-mass dependence of J^P = \frac12^- s-wave and J^P =
\frac32^- d-wave baryon resonances. Parameter-free results are obtained in
terms of the leading order chiral Lagrangian. In the 'heavy' SU(3) limit with
m_\pi =m_K \simeq 500 MeV the s-wave resonances turn into bound states forming
two octets plus a singlet representations of the SU(3) group. Similarly the
d-wave resonances turn into bound states forming an octet and a decuplet in
this limit. A contrasted result is obtained in the 'light' SU(3) limit with
m_\pi =m_K \simeq 140 MeV for which no resonances exist.Comment: 8 pages, three figures, talk presented at HYP200
Reply to Comment on ``Can gravity distinguish between Dirac and Majorana neutrinos?''
This is a reply to a comment (gr-qc/0610098) written by Nieves and Pal about
our paper (gr-qc/0605153) published in Phys. Rev. Lett. 97, 041101 (2006).Comment: 1 page, no figures, REVTe
Long-distance structure of the X(3872)
We investigate heavy quark symmetries for heavy meson hadronic molecules, and
explore the consequences of assuming the X(3872) and as an
isoscalar and an isovector hadronic molecules,
respectively. The symmetry allows to predict new hadronic molecules, in
particular we find an isoscalar bound state with a mass
about 10580 MeV and the isovector charmonium partners of the and
the states. Next, we study the
three body decay. This decay mode is more sensitive to the long-distance
structure of the X(3872) resonance than its and
decays, which are mainly controlled by the short distance part of the X(3872)
molecular wave function. We discuss the final state
interactions, which in some situations become quite important. Indeed in these
cases, a precise measurement of this partial decay width could provide precise
information on the interaction strength between the charm
mesons.Comment: Talk presented at the "XI International Conference on Hyperons, Charm
and Beauty Hadrons (BEACH 2014)", Birmingham (U.K.), July 201
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