Oscar Zapata
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Oscar Zapata has a total of 5 co-authors. Here are the top co-authors by number of shared publications:
- Diego Restrepo
Universidad de Antioquía
4 shared publications - Carlos E. Yaguna
Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain
2 shared publications - Jose Wagner Furtado Valle
Institut de Física Corpuscular -CSIC AHEP Group Universitat de València Parc Científic de Paterna. C/ Catedrático José Beltrán 2 E-46980 Paterna (Valencia SPAIN
2 shared publications - Ki-Young Choi
Department of Physics Pusan National University 609-735 Busan Korea
2 shared publications - Marco Taoso
IFIC CSIC-Universidad de Valencia Ed. Institutos Apdo. Correos 22085 E-46071 Va- lencia Spain
2 shared publications
Latest Publications
- Open Access
Gravitino dark matter and neutrino masses with bilinear R-parity violation
Bilinear R-parity violation provides an attractive origin for neutrino masses and mixings. In such schemes the gravitino is a viable decaying dark matter particle whose R-parity violating decays lead to monochromatic photons with rates accessible to astrophysical observations. We determine the parameter region allowed by gamma-ray line searches, dark matter relic abundance and neutrino oscillation data, obtaining a limit on the gravitino mass $m_{\tilde G} \lsim$ 1-10 GeV corresponding to a relatively low reheat temperature $T_R \lsim$ few $\times 10^7-10^8$ GeV. Neutrino mass and mixing parameters may be reconstructed at accelerator experiments like the Large Hadron Collider.Open AccessGravitino dark matter and neutrino masses with bilinear R-parity violation
Bilinear R-parity violation provides an attractive origin for neutrino masses and mixings. In such schemes the gravitino is a viable decaying dark matter particle whose R-parity violating decays lead to monochromatic photons with rates accessible to astrophysical observations. We determine the parameter region allowed by gamma-ray line searches, dark matter relic abundance and neutrino oscillation data, obtaining a limit on the gravitino mass $m_{\tilde G} \lsim$ 1-10 GeV corresponding to a relatively low reheat temperature $T_R \lsim$ few $\times 10^7-10^8$ GeV. Neutrino mass and mixing parameters may be reconstructed at accelerator experiments like the Large Hadron Collider. - Open Access
- 23 January 2012
- Published by American Physical Society (APS) in Physical Review D
- Vol. 85 (2)
Gravitino dark matter and neutrino masses with bilinear-parity violationBilinear -parity violation provides an attractive origin for neutrino masses and mixings. In such schemes the gravitino is a viable decaying dark matter particle whose -parity violating decays lead to monochromatic photons with rates accessible to astrophysical observations. We determine the parameter region allowed by gamma-ray line searches, dark matter relic abundance, and neutrino oscillation data, obtaining a limit on the gravitino mass corresponding to a relatively low reheat temperature . Neutrino mass and mixing parameters may be reconstructed at accelerator experiments like the Large Hadron Collider. DOI: http://dx.doi.org/10.1103/PhysRevD.85.023523 © 2012 American Physical Society- 23 January 2012
- Published by American Physical Society (APS) in Physical Review D
- Vol. 85 (2)
Open AccessGravitino dark matter and neutrino masses with bilinear-parity violationBilinear -parity violation provides an attractive origin for neutrino masses and mixings. In such schemes the gravitino is a viable decaying dark matter particle whose -parity violating decays lead to monochromatic photons with rates accessible to astrophysical observations. We determine the parameter region allowed by gamma-ray line searches, dark matter relic abundance, and neutrino oscillation data, obtaining a limit on the gravitino mass corresponding to a relatively low reheat temperature . Neutrino mass and mixing parameters may be reconstructed at accelerator experiments like the Large Hadron Collider. DOI: http://dx.doi.org/10.1103/PhysRevD.85.023523 © 2012 American Physical Society - Open Access
Indirect detection of gravitino dark matter including its three-body decays
It was recently pointed out that in supersymmetric scenarios with gravitino dark matter and bilinear R-parity violation, gravitinos with masses below Mw typically decay with a sizable branching ratio into the 3-body final states W^*+lepton and Z^*+neutrino. In this paper we study the indirect detection signatures of gravitino dark matter including such final states. First, we obtain the gamma ray spectrum from gravitino decays, which features a monochromatic contribution from the decay into photon+neutrino and a continuum contribution from the three-body decays. After studying its dependence on supersymmetric parameters, we compute the expected gamma ray fluxes and derive new constraints, from recent FERMI data, on the R-parity breaking parameter and on the gravitino lifetime. Indirect detection via antimatter searches, a new possibility brought about by the three-body final states, is also analyzed. For models compatible with the gamma ray observations, the positron signal is found to be negligible whereas the antiproton one can be significant.
Open AccessIndirect detection of gravitino dark matter including its three-body decays
It was recently pointed out that in supersymmetric scenarios with gravitino dark matter and bilinear R-parity violation, gravitinos with masses below Mw typically decay with a sizable branching ratio into the 3-body final states W^*+lepton and Z^*+neutrino. In this paper we study the indirect detection signatures of gravitino dark matter including such final states. First, we obtain the gamma ray spectrum from gravitino decays, which features a monochromatic contribution from the decay into photon+neutrino and a continuum contribution from the three-body decays. After studying its dependence on supersymmetric parameters, we compute the expected gamma ray fluxes and derive new constraints, from recent FERMI data, on the R-parity breaking parameter and on the gravitino lifetime. Indirect detection via antimatter searches, a new possibility brought about by the three-body final states, is also analyzed. For models compatible with the gamma ray observations, the positron signal is found to be negligible whereas the antiproton one can be significant.
- 1 October 2010
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2010 (10) , 033
Indirect detection of gravitino dark matter including its three-body decays
- 1 October 2010
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2010 (10) , 033
Indirect detection of gravitino dark matter including its three-body decays