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Recently, deviations in flavor observables of B -> D(*) tau nu have beenshown between the predictions in the Standard Model and the experimentalresults reported by BaBar, Belle, and LHCb collaborations. One of the solutionsto this anomaly is obtained in a class of leptoquark model with a scalarleptoquark boson S_1, which is a SU(3)_c triplet and SU(2)_L singlet particlewith -1/3 hypercharge interacting with a quark-lepton pair. With well-adjustedcouplings, this model can explain the anomaly and be compatible with all flavorconstraints. In such a case, the S_1 boson can be pair-produced at CERN's LargeHadron Collider (LHC) and subsequently decay as S_1 -> t tau, b nu, c tau. Thispaper explores the current 8 and 13 TeV constraints, as well as the detailedprospects at 14 TeV, of this flavor-motivated S_1 model. From the currentavailable 8 and 13 TeV LHC searches, we obtain constraints on the S_1 bosonmass for M_{S_1} < 400 GeV - 640 GeV depending on values of the leptoquarkcouplings to fermions. Then we study future prospects for this scenario at the14 TeV LHC using detailed cut analyses and evaluate exclusion/discoverypotentials for the flavor-motivated S_1 leptoquark model from searches for the(b nu) (b nu) and (c tau) (c tau) final states. In the latter case, we considerseveral scenarios for the identification of charm jets. As a result, we findthat the S_1 leptoquark origin of the B -> D(*) tau nu anomaly can be probedwith mass less than around 600/800 GeV at the 14 TeV LHC with 300/3000 fb^-1 ofaccumulated data.

LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar B \to D^{(*)} \tau \bar\nu$ anomaly