Explaining the diphoton excess in alternative left-right symmetric model

Abstract

We propose a possible explanation of the recent diphoton excess reported by ATLAS and CMS collaborations, at around 750 GeV diphoton invariant mass, within the framework of E6 motivated Alternative Left-Right Symmetric Model (ALRSM), which is capable of addressing the B decay anomalies in the flavor sector, the eejj and e / p T jj excesses reported by CMS in run 1 of LHC and has the feature of high scale leptogenesis. We find that gluon-gluon fusion can give the observed production rate of the 750 GeV resonance,ñ, through a loop of scalar leptoquarks (h (c) ) with mass below a few TeV range, whileñ can subsequently decay into γγ final state via loops ofh (c) andẼ (c) . Interestingly, theẼ (c) loop can enhance the diphoton branching ratio significantly to successfully explain the observed cross section of the diphoton signal.

Remarks on the Standard Model predictions for R(D) and R(D*Kim1, López-Castro2, Tostado3 et al. 2017Phys. Rev. D220222View full textAdd to dashboardCite

“…These hints of a possible violation of lepton universality have prompted many theoretical proposals, which include the exchange of charged scalars [12][13][14][15][16][17][18][19], leptoquarks (or, equivalently, R-parity violating supersymmetry) [16,18,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], vector resonances [38] or a W boson [18,36,[39][40][41][42].…”

Trinification can explain the di-photon and di-boson LHC anomalies

“…1 Notice that trinification includes both left-right models (the group SU(2)L⊗ SU(2)R⊗U(1)B−L⊗ SU(3)c is obtained in the limit α, β 1 [54]) and 3-3-1 models [49][50][51][52][53] (the group SU(3)L ⊗ SU(3)c ⊗ U(1)X is obtained from trinification if SU(3)R is broken to its U(1) component that commutes with SU(2)R. This can be achieved adding an extra Higgs scalar in the adjoint). 3-3-1 models have the same minimal set of chiral fermions as trinification, but do not have the WR vector that can fit the di-boson anomaly.…”

“…Minimal versions of left-right models have extra uncolored scalars but do not have extra fermions. In order to reproduce the di-gamma anomaly via gluon fusion, one can add extra quarks [55] and leptons [56], or rely on supersymmetric partners [54], or on extra components of unified multiplets which might remain light as in Alternative Left-Right Models [57].…”

Non-minimal flavored $${S}_{3}\otimes {Z}_{2}$$ S 3 ⊗ Z 2 left–right symmetric model

“…Recently, the left-right scenarios have been revised [15][16][17][18][19][20][21][22][23][24][25] in order to make contact with the latest experimental data of LHC. Moreover, the dark matter problem [26][27][28] and the diphoton excess anomaly [29][30][31][32][33] have been explored in this kind of scenarios.…”