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Author Aristizabal Sierra, D.; De Romeri, V.; Flores, L.J.; Papoulias, D.K.
Title Light vector mediators facing XENON1T data Type Journal Article
Year 2020 Publication (down) Physics Letters B Abbreviated Journal Phys. Lett. B
Volume 809 Issue Pages 135681 - 5pp
Keywords
Abstract Recently the XENON1T collaboration has released new results on searches for new physics in low-energy electronic recoils. The data shows an excess over background in the low-energy tail, particularly pronounced at about 2-3 keV. With an exposure of 0.65 tonne-year, large detection efficiency and energy resolution, the detector is sensitive as well to solar neutrino backgrounds, with the most prominent contribution given by pp neutrinos. We investigate whether such signal can be explained in terms of new neutrino interactions with leptons mediated by a light vector particle. We find that the excess is consistent with this interpretation for vector masses below less than or similar to 0.1 MeV. The region of parameter space probed by the XENON1T data is competitive with constraints from laboratory experiments, in particular GEMMA, Borexino and TEXONO. However we point out a severe tension with astrophysical bounds and cosmological observations.
Address [Sierra, D. Aristizabal] Univ Tecn Federico Santa Maria, Dept Fis, Casilla 110-5,Avda Espana 1680, Valparaiso, Chile, Email: daristizabal@ulg.ac.be;
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0370-2693 ISBN Medium
Area Expedition Conference
Notes WOS:000581871500003 Approved no
Is ISI yes International Collaboration yes
Call Number IFIC @ pastor @ Serial 4602
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Author De Romeri, V.; Hirsch, M.; Malinsky, M.
Title Soft masses in supersymmetric SO(10) GUTs with low intermediate scales Type Journal Article
Year 2011 Publication (down) Physical Review D Abbreviated Journal Phys. Rev. D
Volume 84 Issue 5 Pages 053012 - 15pp
Keywords
Abstract The specific shape of the squark, slepton and gaugino mass spectra, if measured with sufficient accuracy, can provide invaluable information not only about the dynamics underpinning their origin at some very high scale such as the unification scale M(G), but also about the intermediate scale physics encountered throughout their renormalization group equations evolution down to the energy scale accessible for the LHC. In this work, we study general features of the TeV scale soft supersymmetry breaking parameters stemming from a generic mSugra configuration within certain classes of supersymmetry SO(10) GUTs with different intermediate symmetries below M(G). We show that particular combinations of soft masses show characteristic deviations from the mSugra limit in different models and thus, potentially, allow to distinguish between these, even if the new intermediate scales are outside the energy range probed at accelerators. We also compare our results to those obtained for the three minimal seesaw models with mSugra boundary conditions and discuss the main differences between those and our SO(10) based models.
Address [De Romeri, V; Hirsch, M; Malinsky, M] Univ Valencia, AHEP Grp, Inst Fis Corpuscular CSIC, E-46071 Valencia, Spain, Email: deromeri@ific.uv.es
Corporate Author Thesis
Publisher Amer Physical Soc Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1550-7998 ISBN Medium
Area Expedition Conference
Notes WOS:000295267700001 Approved no
Is ISI yes International Collaboration no
Call Number IFIC @ elepoucu @ Serial 777
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Author Calore, F.; De Romeri, V.; Donato, F.
Title Conservative upper limits on WIMP annihilation cross section from Fermi-LAT gamma rays Type Journal Article
Year 2012 Publication (down) Physical Review D Abbreviated Journal Phys. Rev. D
Volume 85 Issue 2 Pages 023004 - 9pp
Keywords
Abstract The spectrum of an isotropic extragalactic gamma-ray background (EGB) has been measured by the Fermi-LAT telescope at high latitudes. Two new models for the EGB are derived from the subtraction of unresolved point sources and extragalactic diffuse processes, which could explain from 30% to 70% of the Fermi-LAT EGB. Within the hypothesis that the two residual EGBs are entirely due to the annihilation of dark matter (DM) particles in the Galactic halo, we obtain stringent upper limits on their annihilation cross section. Severe bounds on a possible Sommerfeld enhancement of the annihilation cross section are set as well. Finally, we consider models for DM annihilation depending on the inverse of the velocity and associate the EGBs to photons arising from the annihilation of DM in primordial halos. Given our choices for the EGB and the minimal DM modeling, the derived upper bounds are claimed to be conservative.
Address [Calore, Francesca] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany, Email: francesca.calore@desy.de
Corporate Author Thesis
Publisher Amer Physical Soc Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1550-7998 ISBN Medium
Area Expedition Conference
Notes WOS:000299930200002 Approved no
Is ISI yes International Collaboration yes
Call Number IFIC @ pastor @ Serial 900
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Author De Romeri, V.; Patel, K.M.; Valle, J.W.F.
Title Inverse seesaw mechanism with compact supersymmetry: Enhanced naturalness and light superpartners Type Journal Article
Year 2018 Publication (down) Physical Review D Abbreviated Journal Phys. Rev. D
Volume 98 Issue 7 Pages 075014 - 15pp
Keywords
Abstract We consider the supersymmetric inverse seesaw mechanism for neutrino mass generation within the context of a low-energy effective theory where supersymmetry is broken geometrically in an extra dimensional theory. It is shown that the effective scale characterizing the resulting compact supersymmetric spectrum can be as low as 500-600 GeV for moderate values of tan beta. The potentially large neutrino Yukawa couplings, naturally present in inverse seesaw schemes, enhance the Higgs mass and allow the superpartners to be lighter than in compact supersymmetry without neutrino masses. The inverse seesaw structure also implies a novel spectrum profile and couplings, in which the lightest supersymmetric particle can be an admixture of isodoublet and isosinglet sneutrinos. Dedicated collider as well as dark matter studies should take into account such specific features.
Address [De Romeri, Valentina; Valle, Jose W. F.] Univ Valencia, CSIC, Inst Fis Corpuscular, AHEP Grp, Calle Catedratico Jose Beltran 2, E-46980 Paterna, Spain, Email: deromeri@ific.uv.es;
Corporate Author Thesis
Publisher Amer Physical Soc Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2470-0010 ISBN Medium
Area Expedition Conference
Notes WOS:000447485900006 Approved no
Is ISI yes International Collaboration yes
Call Number IFIC @ pastor @ Serial 3764
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Author Aristizabal Sierra, D.; De Romeri, V.; Rojas, N.
Title COHERENT analysis of neutrino generalized interactions Type Journal Article
Year 2018 Publication (down) Physical Review D Abbreviated Journal Phys. Rev. D
Volume 98 Issue 7 Pages 075018 - 14pp
Keywords
Abstract Effective neutrino-quark generalized interactions are entirely determined by Lorentz invariance, so they include all possible four-fermion nonderivative Lorentz structures. They contain neutrino-quark nonstandard interactions as a subset, but span over a larger set that involves effective scalar, pseudoscalar, axial and tensor operators. Using recent COHERENT data, we derive constraints on the corresponding couplings by considering scalar, vector and tensor quark currents and assuming no lepton flavor dependence. We allow for mixed neutrino-quark Lorentz couplings and consider two types of scenarios in which: (i) one interaction at the nuclear level is present at a time, (ii) two interactions are simultaneously present. For scenarios (i) our findings show that scalar interactions are the most severely constrained, in particular for pseudoscalar-scalar neutrino-quark couplings. In contrast, tensor and nonstandard vector interactions still enable for sizable effective parameters. We find as well that an extra vector interaction improves the data fit when compared with the result derived assuming only the standard model contribution. In scenarios (ii) the presence of two interactions relaxes the bounds and opens regions in parameter space that are otherwise closed, with the effect being more pronounced in the scalar-vector and scalar-tensor cases. We point out that barring the vector case, our results represent the most stringent bounds on effective neutrino-quark generalized interactions for mediator masses of order similar to 1 GeV. They hold as well for larger mediator masses, case in which they should be compared with limits from neutrino deep-inelastic scattering data.
Address [Aristizabal Sierra, D.; Rojas, N.] Univ Tecn Federico Santa Maria, Dept Fis, Casilla 110-5,Ave Espana 1680, Valparaiso, Chile, Email: daristizabal@ulg.ac.be;
Corporate Author Thesis
Publisher Amer Physical Soc Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2470-0010 ISBN Medium
Area Expedition Conference
Notes WOS:000447933700006 Approved no
Is ISI yes International Collaboration yes
Call Number IFIC @ pastor @ Serial 3770
Permanent link to this record