Minimal left-right symmetric intersecting D-brane model

Anchordoqui, Luis A.; Antoniadis, Ignatios; Goldberg, Haim; Huang, Xing; Lüst, Dieter; Taylor, Tomasz R. (2017). Minimal left-right symmetric intersecting D-brane model. Physical review. D - particles, fields, gravitation, and cosmology, 95(2), 026011. American Physical Society 10.1103/PhysRevD.95.026011

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We investigate left-right symmetric extensions of the standard model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. The left-handed and right-handed fermions transform as doublets under Sp(1)L and Sp(1)R, and so their masses must be generated by the introduction of Higgs fields in a bifundamental (2,2) representation under the two Sp(1) gauge groups. For such D-brane configurations the left-right symmetry must be broken by Higgs fields in the doublet representation of Sp(1)R and therefore Majorana mass terms are suppressed by some higher physics scale. The left-handed and righthanded neutrinos pair up to form Dirac fermions which control the decay widths of the right-handed W' boson to yield comparable branching fractions into dilepton and dijet channels. Using the most recent searches at LHC13 Run II with 2016 data we constrain the (gR;mW') parameter space. Our analysis indicates that independent of the coupling strength gR, gauge bosons with masses mW' ≳ 3.5 TeV are not ruled out. As the LHC is just beginning to probe the TeV scale, significant room for W' discovery remains.

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