LHC Constraints on Scalar Diquarks

Bruna Pascual-Dias; Pratishruti Saha; David London

doi:10.1007/JHEP07(2020)144

paper

LHC Constraints on Scalar Diquarks

arXiv:2006.13385 · doi:10.1007/JHEP07(2020)144

Abstract

A number of years ago, low-energy constraints on scalar diquarks, particles that couple to two quarks, were examined. It was found that the two most weakly-constrained diquarks are $D^{u}$ and $D^{d}$ , colour antitriplets that couple to $u_{R}^{i} u_{R}^{j}$ and $d_{R}^{i} d_{R}^{j}$ , respectively. These diquarks have not been observed at the LHC. In this paper, we add the LHC measurements to the low-energy analysis, and find that the constraints are significantly improved. As an example, denoting $x^{u}$ as the $D^{u}$ coupling to the first and second generations, for $M_{D^{u}} = 600$ GeV, the low-energy constraint is $∣ x^{u} ∣ \leq 14.4$ , while the addition of the LHC dijet measurement leads to $∣ x^{u} ∣ \leq 0.13$ -- $0.15$ . Further improvements are obtained by adding the measurement of single top production with a $p_{T}$ cut. These new constraints must be taken into account in making predictions for other low-energy indirect effects of diquarks.

17 pages, 8 figures, new references added

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Indian Contributions to LHC Theory