Revisiting light stringy states in view of the 750 GeV diphoton excess

Abstract

We investigate light massive string states that appear at brane intersections. They replicate the massless spectrum in a richer fashion and may be parametrically lighter than standard Regge excitations. We identify the first few physical states and determine their BRST invariant vertex operators. In the supersymmetric case we reconstruct the super-multiplet structure. We then compute some simple interactions, such as the decay rate of a massive scalar or vector into two massless fermions. Finally we suggest an alternative interpretation of the 750 GeV diphoton excess at LHC in terms of a light massive string state, a replica of the Standard Model Higgs.

29 pages, 5 eps figures. v2

References in corpus (28)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Progress in D-brane model building
• Orientifolds, hypercharge embeddings and the Standard Model
• Computation of D-brane instanton induced superpotential couplings - Majorana masses from string theory
• The LHC String Hunter's Companion
• 750 GeV Diphotons from a D3-brane
• Minimal Anomalous U(1)' Extension of the MSSM
• Millions of Standard Models on Z6-prime?
• Multiple dark matter scenarios from ubiquitous stringy throats
• Direct Production of Lightest Regge Resonances
• A Realistic World from Intersecting D6-Branes
• String predictions for near future colliders from one-loop scattering amplitudes around D-brane worlds
• 750 GeV diphotons from closed string states
• Jet signals for low mass strings at the LHC
• Direct photons as probes of low mass strings at the LHC
• Stringy origin of Tevatron Wjj anomaly
• On the soft limit of closed string amplitudes with massive states
• The 750 GeV diphoton LHC excess and Extra Z's in Heterotic-String Derived Models
• The Importance of Being Rigid: D6-Brane Model Building on T6/Z2xZ6' with Discrete Torsion
• The Weinberg Operator and a Lower String Scale in Orientifold Compactifications
• 750 GeV Diphoton excess from $E_6$ in F-theory GUTs
• Neutron Majorana mass from exotic instantons
• Proton decay via dimension-six operators in intersecting D6-brane models
• Vector-Like Exotics in F-Theory and 750 GeV Diphotons
• New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5)
• Constructing the supersymmetric Standard Model from intersecting D6-branes on the Z_6' orientifold
• String Resonances at Hadron Colliders
• The generating function of amplitudes with N twisted and M untwisted states

Cited by in corpus (8)

• Models of LHC Diphoton Excesses Valid up to the Planck scale
• Systematic Study of Diphoton Resonance at 750 GeV from Sgoldstino
• Update on 750 GeV diphotons from closed string states
• Non-supersymmetric branes
• Diphoton Resonance in F-theory inspired Flipped SO(10)
• Light stringy states and the $g-2$ of the muon
• The 750 GeV LHC diphoton excess from a baryon number conserving string model
• Lifetimes of light stringy states