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CERN Document Server 找到 2,021 笔记录  1 - 10下一个最後  跳到记录: 检索需时 3.51 秒. 
1.
(100)
CP and Lepton-Number Violation in GUT Neutrino Models with Abelian Flavour Symmetries / Ellis, John R. (CERN) ; Gomez, Mario E. (Huelva U.) ; Lola, Smaragda (Patras U.)
We study the possible magnitudes of CP and lepton-number-violating quantities in specific GUT models of massive neutrinos with different Abelian flavour groups, taking into account experimental constraints and requiring successful leptogenesis. We discuss SU(5) and flipped SU(5) models that are consistent with the present data on neutrino mixing and upper limits on the violations of charged-lepton flavours and explore their predictions for the CP-violating oscillation and Majorana phases. [...]
hep-ph/0612292; CERN-PH-TH-2006-181; CERN-PH-TH-2006-181.- Geneva : CERN, 2007 - 28 p. - Published in : JHEP 07 (2007) 052 Fulltext: 0612292 - PDF; arXiv:hep-ph_0612292 - PDF; SISSA/IOP Open Access article: PDF; External link: Preprint
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2.
(91)
Flat Directions in Flipped SU(5); 1, All-Order Analysis / Cleaver, G.B. (Texas A-M ; HARC, Woodlands) ; Ellis, John R. (CERN) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy)
We present a systematic classification of field directions for the string-derived flipped SU(5) model that are D- and F-flat to all orders. Properties of the flipped SU(5) model with field values in these directions are compared to those associated with other flat directions that have been shown to be F-flat to specific finite orders in the superpotential. [...]
hep-ph/0009338; ACT-13-00; CERN-TH-2000-266; CTP-TAMU-30-00; CERN-TH-2000-266; ACT-2000-13; CTP-TAMU-2000-30.- Geneva : CERN, 2001 - 22 p. - Published in : Nucl. Phys. B 600 (2001) 315-333 Access to fulltext document: PDF; Fulltext: PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(86)
Leptogenesis in the Light of Super-Kamiokande Data and a Realistic String Model / Ellis, Jonathan Richard (CERN) ; Lola, S ; Nanopoulos, Dimitri V
We discuss leptogenesis in the light of indications of neutrino masses and mixings from Super-Kamiokande and other data on atmospheric neutrinos, as well as the solar neutrino deficit. Neutrino masses and mixings consistent with these data may produce in a natural and generic way a lepton asymmetry that is suffient to provide the observed baryon asymmetry, after processing via non-perturbative electroweak effects. [...]
hep-ph/9902364; ACT-1999-1; CERN-TH-99-016; CTP-TAMU-99-4.- Houston, TX : Houston Univ. Adv. Res. Cent. The Woodlands, 1999 - 18 p. - Published in : Phys. Lett. B 452 (1999) 87 Access to fulltext document: PDF; External link: hep-ph/9902364 PDF - CERN library copies
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4.
(81)
Implications of Anomalous U(1) Symmetry in Unified Models : the Flipped SU(5) x U(1) Paradigm / Ellis, John R. (CERN) ; Leontaris, G.K. (Ioannina U.) ; Rizos, J. (Ioannina U.)
A generic feature of string-derived models is the appearance of an anomalous Abelian U(1)_A symmetry which, among other properties, constrains the Yukawa couplings and distinguishes the three families from each other. In this paper, we discuss in a model-independent way the general constraints imposed by such a U(1)_A symmetry on fermion masses, R-violating couplings and proton-decay operators in a generic flipped SU(5) x U(1)' model. [...]
hep-ph/0002263; CERN-TH-2000-064; IOA-02-2000; CERN-TH-2000-064; IOA-2000-2.- Geneva : CERN, 2000 - 28 p. - Published in : JHEP 05 (2000) 001 Access to fulltext document: PDF; Fulltext: PDF; SISSA/IOP Published version, local copy: PDF; External link: Preprint - Please contact the library if you need to access this document.
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5.
(72)
Neutrino masses in the flipped SU(5) x U(1) and the SU(4) x O(4) GUT models / Ranfone, S ; Papageorgiou, E
RAL-92-012. - 1992. - 15 p.
CERN library copies
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6.
(61)
The neutrino mass spectrum in the supersymmetric flipped SU(5) x U(1) GUT model / Ranfone, S
UAB-FT-324.- Barcelona : Barcelona Univ. Dept. Fís. Teór., 1994 - 11 p. - Published in : Phys. Lett. B 324 (1994) 370-375
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7.
(57)
Low energy lepton violation from supersymmetric flipped SU(5) / Brahm, D E ; Hall, L J
LBL-27165 ; UCB-PTH-89-9. - 1989. - 15 p.
CERN library copies
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8.
(55)
Phenomenology of the hierarchical lepton mass spectrum in the flipped SU(5) x U(1) string model / Leontaris, George K ; Nanopoulos, Dimitri V
CERN-TH-5075-88; MAD-TH-88-16; UGVA-DPT-578.- Geneva : CERN, 1988 - 15 p. - Published in : Phys. Lett. B 212 (1988) 327-333 Fulltext: PDF; - CERN library copies
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9.
(54)
Three-fermion model of quarks and leptons with SU(5)-GUT x SU(3)-family / Koide, Y
SH-84-03. - 1984. - 9 p.
CERN library copies
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10.
(54)
Neutrinos, neutralinos, and light neutral Higgs bosons in supersymmetric flipped SU(5) / Drees, Manuel ; Tata, Xerxes
KEK-87-105 ; KEK-TH-183 ; MAD-PH-391. - 1987. - 18 p.
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