Scientific Commons: A. Ibarra

Swift observations of the X-ray and UV evolution of V2491 Cyg (Nova Cyg 2008 No. 2) (2009)

Page, K. L., Osborne, J. P., Evans, P. A., Wynn, G. A., Beardmore, A. P., Starling, R. L. C., ...

We present extensive, high-density Swift observations of V2491 Cyg (Nova Cyg 2008 No. 2). Observing the X-ray emission from only one day after the nova discovery, the source is followed through the...

Simultaneous Multiwavelength Observations of Markarian 421 During Outburst (2009)

Collaboration, The VERITAS, Ibarra, A., Rodriguez, P., Collaboration, The MAGIC

We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the...

Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing (2009)

Ibarra, A., Ringwald, A., Tran, D., Weniger, C.

If interpreted in terms of decaying dark matter, the steep rise in the positron fraction of cosmic rays above 10 GeV, as observed by the PAMELA experiment, suggests an underlying production mechanism...

Pre-nova X-ray observations of V2491 Cyg (Nova Cyg 2008b) (2009)

Ibarra, A., Kuulkers, E., Osborne, J. P., Page, K., Ness, J. U., Saxton, R. D., ...

Classical novae are phenomena caused by explosive hydrogen burning on an accreting white dwarf. So far, only one classical nova has been identified in X-rays before the actual optical outburst...

Hidden gauginos of an unbroken U(1): Cosmological constraints and phenomenological prospects. (2009)

A. Ibarra, DESY Forschung Hochenergiephysik, A. Ringwald, C. Weniger

Journal article

Hidden Gauginos of an Unbroken U(1): Cosmological Constraints and Phenomenological Prospects. (2009)

A. Ibarra, DESY Forschung Hochenergiephysik, A. Ringwald, C. Weniger

Journal article

Unstable Gravitino Dark Matter and Neutrino Flux. (2009)

L. Covi, DESY Forschung Hochenergiephysik, M. Grefe, A. Ibarra, D. Tran

Journal article

Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing. (2009)

A. Ibarra, DESY Forschung Hochenergiephysik, A. Ringwald, D. Tran, C. Weniger

Internal report | Preprint

Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing. (2009)

A. Ibarra, DESY Forschung Hochenergiephysik, A. Ringwald, D. Tran, C. Weniger

Journal article

Hidden gauginos of an unbroken U(1): Cosmological constraints and phenomenological prospects (2008)

Ibarra, A., Ringwald, A., Weniger, C.

We study supersymmetric scenarios where the dark matter is the gaugino of an unbroken hidden U(1) which interacts with the visible world only via a small kinetic mixing with the hypercharge. Strong...

Flavor physics of leptons and dipole moments (2008)

Raidal, M, Bigi, I, Mangano, ML, Semertzidis, Y, Abel, S, ...

This chapter of the report of the ``Flavor in the era of the LHC'' Workshop discusses the theoretical, phenomenological and experimental issues related to flavor phenomena in the charged lepton...

Flavor physics of leptons and dipole moments (2008)

Raidal, M, Bigi, I, Mangano, ML, Semertzidis, Y, Abel, S, ...

This chapter of the report of the “Flavor in the era of the LHC” Workshop discusses the theoretical, phenomenological and experimental issues related to flavor phenomena in the charged lepton...

Unusual magnetic behavior in ferrite hollow nanospheres (2008)

Lima Jr, E., Vargas, J. M., Zysler, R. D., Rechenberg, H. R., Arbiol, J., Goya, G. F., ...

We report unusual magnetic behavior in iron oxide hollow nanospheres of 9.3 $nm$ in diameter. The large fraction of atoms existing at the inner and outer surfaces gives rise to a high magnetic...

Collider aspects of flavour physics at high Q (2008)

Lari, T., Pape, L., Porod, W., Aguilar-Saavedra, J. A., Del Aguila, F., Allanach, B. C., ...

This review presents flavour related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss...

Flavour physics of leptons and dipole moments (2008)

Raidal, M., Bigi, I., Mangano, M. L., Semertzidis, Y., Abel, S., ...

This chapter of the report of the ``Flavour in the era of the LHC'' Workshop discusses the theoretical, phenomenological and experimental issues related to flavour phenomena in the charged lepton...

Hidden Gauginos of an Unbroken U(1): Cosmological Constraints and Phenomenological Prospects. (2008)

A. Ibarra, DESY Forschung Hochenergiephysik, A. Ringwald, C. Weniger

Internal report | Preprint

Vacuum ultraviolet excitation of the 4.4 eV emission band in neutron irradiated KU1 and KS-4V quartz glasses (2008)

M. Leon, P. Martin, R. Vila, J. Molla, R. Roman, ...

Journal article

Unstable Gravitino Dark Matter and Neutrino Flux. (2008)

L. Covi, DESY Forschung Hochenergiephysik, M. Grefe, A. Ibarra, D. Tran

Internal report | Preprint

Unstable Gravitino Dark Matter and Neutrino Flux. (2008)

L. Covi, DESY Forschung Hochenergiephysik, M. Grefe, A. Ibarra, D. Tran

Internal report | Preprint

Theoretical Constraints on the Rare tau Decays in the MSSM. (2008)

A. Ibarra, DESY Forschung Hochenergiephysik, T. Shindou, C. Simonetto

Journal article

Gamma-Ray Spectrum from Gravitino Dark Matter Decay. (2008)

A. Ibarra, DESY Forschung Hochenergiephysik, D. Tran

Journal article

Antimatter Signatures of Gravitino Dark Matter Decay. (2008)

A. Ibarra, DESY Forschung Hochenergiephysik, D. Tran

Journal article

Collider aspects of flavour physics at high Q (2008)

Lari, T., Pape, L., Porod, W., Aguilar-Saavedra, J. A., Del Aguila, F., Allanach, B. C., ...

This review presents flavour related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss...

Recent EU activities for IFMIF EVEDA in the framework of the broader approach. (2007)

Ibarra, A., Möslang, A., Lässer, R., Ferdinand, R., Andreani, R., Surrey, E., ...

Fusion Engineering and Design, 82(2007) S.2422-29

Hints on the high-energy seesaw mechanism from the low-energy neutrino spectrum (2006)

Casas, J. A., Ibarra, A., Jimenez-Alburquerque, F.

It is an experimental fact that the mass ratio for the two heavier neutrinos, h = m_3/m_2 < 6, is much smaller than the typical quark and lepton hierarchies, which are O(20-300). We have explored...

Flavour Matters in Leptogenesis (2006)

Abada, A, Davidson, Sacha, Ibarra, A, Josse-Michaux, F X, Losada, M, Riotto, Antonio

We give analytic approximations to the baryon asymmetry produced by thermal leptogenesis with hierarchical right-handed neutrinos. Our calculation includes flavour-dependent washout processes and CP...

Flavour Matters in Leptogenesis (2006)

Abada, A., Davidson, S., Ibarra, A., Losada, M., Riotto, A.

We give analytic approximations to the baryon asymmetry produced by thermal leptogenesis with hierarchical right-handed neutrinos. Our calculation includes flavour-dependent washout processes and CP...

Recent EU activities for IFMIF EVEDA in the framework of the broader approach. (2006)

Ibarra, A., Möslang, A., Lässer, R., Ferdinand, R., Andreani, R., Surrey, E., ...

24th Symp.on Fusion Technology (SOFT 2006), Warszawa, PL, September 11-15, 2006

Next phase activity of the international fusion materials irradiation facility under a new framework. (2006)

Matsui, H., Sugimoto, M., Takatsu, H., Nakamura, H., Muroga, T., Shimizu, A., ...

21st IAEA Fusion Energy Conf., Chengdu, China, October 16-21, 2006

Probing lepton flavour violation in slepton NLSP scenarios (2004)

Hamaguchi, K, Ibarra, A

In supersymmetric models where the gravitino is the lightest superparticle, the next-to-lightest superparticle (NLSP) is long-lived, and hence could be collected and studied in detail. We study the...

Systematic Approach to Gauge-Invariant Relations between Lepton Flavor Violating Processes (2004)

Ibarra, A, Massó, E, Redondo, J

We analyze four-lepton contact interactions that lead to lepton flavor violating processes, with violation of individual family lepton number but total lepton number conserved. In an effective...

Flavour Symmetries and Kahler Operators (2004)

Espinosa, J R, Ibarra, A

Any supersymmetric mechanism to solve the flavour puzzle would generate mixing both in the superpotential Yukawa couplings and in the Kahler potential. In this paper we study, in a model independent...

Neutrino phenomenology: the case of two right-handed neutrinos (2003)

Ibarra, A, Ross, Graham G

We make a general analysis of neutrino phenomenology for the case neutrino masses are generated by the see-saw mechanism with just two right handed neutrinos. We find general constraints on...

Neutrino properties from Yukawa structure (2003)

Ibarra, A, Ross, Graham G

We discuss the implications for lepton mixing and CP violation of structure in the lepton mass matrices, for the case that neutrino masses are generated by the see-saw mechanism with an hierarchical...

Oscillating neutrinos and mu --> e, gamma (2001)

Casas, J. A., Ibarra, A.

If neutrino masses and mixings are suitable to explain the atmospheric and solar neutrino fluxes, this amounts to contributions to FCNC processes, in particular mu --> e, gamma. If the theory is...

R. M. Sambruna, F. A. Aharonian, H. Krawczynski, A. G. Akhperjanian, J. A. Barrio, K. Bernlo Hr, ...

We present exactly simultaneous X-ray and TeV monitoring with RXT E and HEGRA of the TeV blazar Mrk 501 during 15 days in 1998 June. After an initial period of very low ux at both wavelengths, the...

Impact of radiative corrections on sterile neutrino scenarios (1999)

Ibarra, A., Navarro, I.

In sterile neutrino scenarios, radiative corrections induce mass splittings proportional to the top Yukawa coupling, in contrast to the three active neutrino case where the induced splittings are...

Radiation effects on dielectric losses of Au-doped silicon. (1999)

Molla, J., Vila, R., Heidinger, R., Ibarra, A.

Proc.of the 8th Internat.Conf.on Fusion Reactor Materials, Sendai, J, October 26-31, 1997 Part B

Pre- and post-irradiation studies on mm-wave losses in reference window materials for electron cyclotron wave systems. (1998)

Heidinger, R., Ibarra, A., Molla, J.

Proc.of the 8th Internat.Conf.on Fusion Reactor Materials, Sendai, J, October 26-31, 1997 Part B S.1822-26

Electron-irradiated silicon: an optimized material for gyrotron windows. (1995)

Molla, J., Ibarra, A., Heidinger, R., Hodgson, E.R.

Journal of Nuclear Materials, 218(1995) S.108-12

Alumina ceramics for heating systems. (1994)

Molla, J., Heidinger, R., Ibarra, A.

6th Internat.Conf.on Fusion Reactor Materials, Stresa, I, September 27 - October 1, 1993