Muon $g-2$ discrepancy within D-brane string compactifications

Abstract

Very recently, the Muon $g-2$ experiment at Fermilab has confirmed the E821 Brookhaven result, which hinted at a deviation of the muon anomalous magnetic moment from the Standard Model (SM) expectation. The combined results from Brookhaven and Fermilab show a difference with the SM prediction $\delta a_{\mu }=(251\pm 59)\times 10^{-11}$ at a significance of $4.2\sigma$, strongly indicating the presence of new physics. Motivated by this new result we reexamine the contributions to the muon anomalous magnetic moment from both: (i)~the ubiquitous $U(1)$ gauge bosons of D-brane string theory constructions and (ii)~the Regge excitations of the string. We show that, for a string scale $\mathcal{O}(\mathrm{PeV})$, the contribution from anomalous $U(1)$ gauge bosons which couple to hadrons could help to reduce (though not fully eliminate) the discrepancy reported by the Muon $g-2$ Collaboration. Consistency with null results from LHC searches of new heavy vector bosons imparts the dominant constraint. We demonstrate that the contribution from Regge excitations is strongly suppressed as it was previously conjectured. We also comment on contributions from Kaluza-Klein (KK) modes, which could help resolve the $\delta a_{\mu }$ discrepancy. In particular, we argue that for 4-stack intersecting D-brane models, the KK excitations of the $U(1)$ boson living on the lepton brane would not couple to hadrons and therefore can evade the LHC bounds while fully bridging the $\delta a_{\mu }$ gap observed at Brookhaven and Fermilab.

arXiv commentMatching version to be published in Fortsch. Phys

References in corpus (51)

• New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• The anomalous magnetic moment of the muon in the Standard Model
• The Muon g-2
• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Multi-Parton Amplitudes in Gauge Theories
• Reevaluation of the Hadronic Contributions to the Muon g-2 and to alpha(MZ)
• Toward Realistic Intersecting D-Brane Models
• Chiral Four-Dimensional N=1 Supersymmetric Type IIA Orientifolds from Intersecting D6-Branes
• Three-Family Supersymmetric Standard-like Models from Intersecting Brane Worlds
• Intersecting Brane Worlds
• D=4 Chiral String Compactifications from Intersecting Branes
• Type-I strings on magnetised orbifolds and brane transmutation
• Noncommutative Compactifications of Type I Strings on Tori with Magnetic Background Flux
• Limits on extra dimensions in orbifold compactifications of superstrings
• A D-brane alternative to unification
• The Standard Model from Stable Intersecting Brane World Orbifolds
• Type I Strings with F- and B-Flux
• Orientifolds, hypercharge embeddings and the Standard Model
• Search for high mass dijet resonances with a new background prediction method in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• D-branes and the Standard Model
• Z' physics with early LHC data
• Z'_{B-L} discovery potential at the LHC for \sqrt{s}=7 TeV
• Dijet signals for low mass strings at the LHC
• The LHC String Hunter's Companion
• Splitting Supersymmetry in String Theory
• LHC Phenomenology for String Hunters
• The anomalous magnetic moment of the muon in the D-brane realization of the Standard Model
• 750 GeV diphotons from closed string states
• Right-Handed Neutrinos as the Dark Radiation: Status and Forecasts for the LHC
• 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
• The Minimal Quiver Standard Model
• Decay widths of lowest massive Regge excitations of open strings
• Neutrino Cosmology after WMAP and LHC7
• String Phenomenology at the LHC
• Stringy explanation of $b\to s{\ell }^{+}{\ell }^{-}$ anomalies
• Z'-gauge Bosons as Harbingers of Low Mass Strings
• A Course in Amplitudes
• Stringy origin of diboson and dijet excesses at the LHC
• Vacuum Stability of Standard Model^{++}
• CLASSICAL PHOTOABSORPTION SUM RULES
• LHC Phenomenology and Cosmology of String-Inspired Intersecting D-Brane Models
• String Resonances at Hadron Colliders
• Anomalous $U(1)$ Gauge Bosons as Light Dark Matter in String Theory
• Searching for string resonances in e^+e^- and γγcollisions
• Update on 750 GeV diphotons from closed string states
• Gravitons and the Drell-Hearn-Gerasimov Sum Rule
• Neutralino dark matter annihilation to monoenergetic gamma rays as a signal of low mass superstrings
• Minimal left-right symmetric intersecting D-brane model

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• Leptophilic U(1) Massive Vector Bosons from Large Extra Dimensions
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• Light stringy states and the $g-2$ of the muon
• Fractionary Charged Particles Confronting Lepton Flavor Violation and the Muon's Anomalous Magnetic Moment