Subdominant Left-Right Scalar Dark Matter as Origin of the 750 GeV Di-photon Excess at LHC

Abstract

We study the possibility of explaining the recently reported 750 GeV di-photon excess at LHC within the framework of a left-right symmetric model. The 750 GeV neutral scalar in the model is dominantly an admixture of neutral components of scalar bidoublets with a tiny fraction of neutral scalar triplet. Incorporating $SU(2)$ septuplet scalar pairs into the model, we enhance the partial decay width of the 750 GeV neutral scalar into di-photons through charged septuplet components in loop while keeping the neutral septuplet components as subdominant dark matter candidates. The model also predicts the decay width of the 750 GeV scalar to be around 36 GeV to be either confirmed or ruled out by future LHC data. The requirement of producing the correct di-photon signal automatically keeps the septuplet dark matter abundance subdominant in agreement with bounds from direct and indirect detection experiments. We then briefly discuss different possibilities to account for the remaining dark matter component of the Universe in terms of other particle candidates whose stability arise either due to remnant discrete symmetry after spontaneous breaking of $U(1{)}_{B-L}$ or due to high $SU(2)$-dimension forbidding their decay into lighter particles.

32 pages, 12 figures, to appear in IJMPA

References in corpus (24)

• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Di-photon resonance around 750 GeV: shedding light on the theory underneath
• The Minimal Scalar-Stealth Top Interpretation of the Diphoton Excess
• A Boost Test of Anomalous Diphoton Resonance at the LHC
• Interpreting $750$ GeV Diphoton Excess with R-parity Violating Supersymmetry
• Radion Candidate for the LHC Diphoton Resonance
• LHC diphotons from electroweakly pair-produced composite pseudoscalars
• LHC diphoton 750 GeV resonance as an indication of $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ gauge symmetry
• The LHC 750 GeV diphoton excess in supersymmetry with gauged baryon and lepton numbers
• LHC diphoton excess from colorful resonances
• Strong CP Problem, Neutrino Masses and the 750 GeV Diphoton Resonance
• Landau pole in the Standard Model with weakly interacting scalar fields
• The Diphoton Excess from an Exceptional Supersymmetric Standard Model
• Broad Diphotons from Narrow States
• Dark Matter Theories in the Light of Diphoton Excess
• Diphoton excess at 750 GeV in an extended scalar sector
• Probing degenerate heavy Higgs bosons in NMSSM with vector-like particles
• Diphoton Excess in Consistent Supersymmetric SU(5) Models with Vector-like Particles
• The $750\text{GeV}$ diphoton resonance in the light of a 2HDM with $S_3$ flavour symmetry
• Diphoton Revelation of the Utilitarian Supersymmetric Standard Model
• Pseudoscalar Gluinonia to 750 GeV LHC Diphotons
• Two Higgs Bi-doublet Left-Right Model With Spontaneous P and CP Violation
• On the possible new heavy scalar and pseudoscalar resonances at the LHC
• Extension of $\nu$MSM model and possible explanations of recent astronomical and collider observations

Cited by in corpus (25)

• 750 GeV Diphoton Resonance from Singlets in an Exceptional Supersymmetric Standard Model
• Theoretical constraints on masses of heavy particles in Left-Right Symmetric Models
• Digamma, what next?
• Interpreting the 750 GeV digamma excess: a review
• Light Sterile Neutrino and Dark Matter in Left-Right Symmetric Models Without Higgs Bidoublet
• Confronting a New Three-loop Seesaw Model with the 750 GeV Diphoton Excess
• Diphoton Excess and Running Couplings
• Diphoton excess at 750 GeV and LHC constraints in models with vector-like particles
• Models of LHC Diphoton Excesses Valid up to the Planck scale
• A four-loop Radiative Seesaw Model
• Systematic Study of Diphoton Resonance at 750 GeV from Sgoldstino
• Scalar dark matter explanation of the DAMPE data in the minimal Left-Right symmetric model
• Diphotons from an Electroweak Triplet-Singlet
• A Flippon Related Singlet at the LHC II
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Topological Structure of the Vacuum, Cosmological Constant and Dark Energy
• Learning from the New Higgs-like Scalar before It Vanishes
• Diphoton decay for a 750 GeV scalar boson in a $SU(6)\otimes U(1{)}_X$ model
• Minimal Dilaton Model and the Diphoton Excess
• Neutrinoless double beta decay in minimal left-right symmetric model with universal seesaw
• Plateau Inflation in $R$-parity Violating MSSM
• Connecting the LHC diphoton excess to the Galatic center gamma-ray excess
• Phenomenology of an $SU(2{)}_1\times SU(2{)}_2\times U(1{)}_Y$ model at the LHC
• The 750 GeV Diphoton excess, Dark Matter and Constraints from the IceCube experiment
• Neutrino Mass and Neutrinoless double beta decay in SO(10) GUT with Pati-Salam symmetry