A Novel String Derived Z' With Stable Proton, Light-Neutrinos and R-parity violation

Abstract

The Standard Model indicates the realization of grand unified structures in nature, and can only be viewed as an effective theory below a higher energy cutoff. While the renormalizable Standard Model forbids proton decay mediating operators due to accidental global symmetries, many extensions of the Standard Model introduce such dimension four, five and six operators. Furthermore, quantum gravity effects are expected to induce proton instability, indicating that the higher energy cutoff scale must be above 10^{16}GeV. Quasi-realistic heterotic string models provide the arena to explore how perturbative quantum gravity affects the particle physics phenomenology. An appealing explanation for the proton longevity is provided by the existence of an Abelian gauge symmetry that suppresses the proton decay mediating operators. Additionally, such a low-scale U(1) symmetry should: allow the suppression of the left-handed neutrino masses by a seesaw mechanism; allow fermion Yukawa couplings to the electroweak Higgs doublets; be anomaly free; be family universal. These requirements render the existence of such U(1) symmetries in quasi-realistic heterotic string models highly non-trivial. We demonstrate the existence of a U(1) symmetry that satisfies all of the above requirements in a class of left-right symmetric heterotic string models in the free fermionic formulation. The existence of the extra Z' in the energy range accessible to future experiments is motivated by the requirement of adequate suppression of proton decay mediation. We further show that while the extra U(1) forbids dimension four baryon number violating operators it allows dimension four lepton number violating operators and R-parity violation.

arXiv comment16 pages. Standard LaTex. minor changes

References in corpus (28)

• Searching for realistic 4d string models with a Pati-Salam symmetry -- Orbifold grand unified theories from heterotic string compactification on a Z6 orbifold
• Supersymmetric Standard Model from the Heterotic String
• Construction of Realistic Standard--like Models in the Free Fermionic Superstring Formulation
• String derived MSSM and M-theory Unification
• The Search for a realistic flipped SU(5) string model
• Aspects of Nonrenormalizable Terms in a Superstring Derived Standard--like Model
• N=1 supersymmetric SU(4)xSU(2)LxSU(2)R effective theory from the weakly coupled heterotic superstring
• Heterotic Brane World
• Classification of the chiral Z2XZ2 fermionic models in the heterotic superstring
• Left-Right Symmetric Heterotic-String Derived Models
• Proton stability in superstring derived models
• On the anomalous U(1) in free fermionic superstring models
• A Minimal Superstring Standard Model II: A Phenomenological Study
• Flat Directions in Left-Right Symmetric String Derived Models
• NAHE-based string models with SU(4) X SU(2) X U(1) SO(10) Subgroup
• Doublet-Triplet Splitting in Realistic Heterotic String Derived models
• Spectra in Standard-like Z_3 Orbifold Models
• A Minimal Superstring Standard Model I: Flat Directions
• Calculating Fermion masses in Superstring Derived Standard-like Models
• Toward the classification of the realistic free fermionic models
• Phenomenology of Non-Abelian Flat Directions in a Minimal Superstring Standard Model
• The Essential Role of String-Derived Symmetries in Ensuring Proton-Stability and Light Neutrino Masses
• Proton Decay, Black Holes, and Large Extra Dimensions
• Top Quark Mass Prediction in Superstring Derived Standard--like Models
• String Inspired Neutrino Mass Textures in Light of KamLAND and WMAP
• Proton Stability and Superstring Z'
• Local discrete symmetries from superstring derived models
• String Inspired Z' Model With Stable Proton and Light Neutrino Masses

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• The Physics of Heavy Z' Gauge Bosons
• The Heterotic Road to the MSSM with R parity
• Minimal Anomalous U(1)' Extension of the MSSM
• Constraints on Primordial Black Holes From Big Bang Nucleosynthesis Revisited
• Right-handed Neutrinos in F-theory Compactifications
• Searching for MeV-Scale Gauge Bosons with IceCube
• Z' Mediated Dark Matter Models for the Galactic Center Gamma-Ray Excess
• $Z^{\prime }$ Mediated WIMPs: Dead, Dying, or Soon to be Detected?
• Searching for Extra Z' from Strings and Other Models at the LHC with Leptoproduction
• String Derived Exophobic SU(6)xSU(2) GUTs
• Neutron Majorana mass from exotic instantons
• Trilinear Anomalous Gauge Interactions from Intersecting Branes and the Neutral Currents Sector
• T-branes and Yukawa Couplings
• A Light Z' Heterotic-String Derived Model
• Extra $Z^{\prime }$s and $W^{\prime }$s in Heterotic--String Derived Models
• A Theoretical Framework for R-parity Violation
• Discrete gauge symmetries and proton stability in the U(1)'-extended MSSM
• Light Z' in Heterotic String Standard-like Models
• Proton Stability and Light $Z^{\prime }$ Inspired by String Derived Models
• Z' signals in polarised top-antitop final states
• TeV Scale Seesaw and a flavorful Z' at the LHC
• Proton Stability, Gauge Coupling Unification and a Light $Z^{\prime }$ in Heterotic-string Models
• Flavorful $Z^{\prime }$ signatures at LHC and ILC
• The LHC di-photon excess and Gauge Coupling Unification in Extra $Z^{\prime }$ Heterotic-String Derived Models
• Gauged Baryon and Lepton Number in MSSM_4 Brane Worlds
• Leptophobic Z' in Heterotic-String Derived Models
• U(1)' coupling constant at low energies from heterotic orbifolds
• Precision studies for string derived $Z^{\prime }$ dynamics at the LHC
• Low Scale Non-universal, Non-anomalous U(1)'_F in a Minimal Supersymmetric Standard Model
• $Z^{\prime }$s and sterile neutrinos from heterotic string models: exploring $Z^{\prime }$ mass exclusion limits