Abstract
Many extensions of the standard model (SM) involve new massive particles charged under the electroweak gauge symmetry. The electroweakly interacting new particles affect various SM processes through radiative corrections. We discuss the possibility of detecting such new particles based on the precise measurement of the SM processes at high energy hadron colliders. It then turns out that Drell-Yan processes receive radiative corrections from the electroweakly interacting particles at the level of mathcal{O}left(0.1-10right)% . It is hence possible to indirectly search for the Higgsino up to the mass of 400 GeV and the quintet (5-plet) Majorana fermion up to the mass of 1200 GeV at the high-luminosity running of the Large Hadron Collider, if the systematic uncertainty associated with the estimation of the SM background becomes lower than the statistical one.
Highlights
JHEP06(2018)049 number of 2±1/2, which is often predicted to be the lightest SUSY particle in the so-called natural SUSY scenario [32]
We focus on the Drell-Yan process pp → + −+X in this paper with p and ± being a proton and a lepton, and discuss how EWIMP modifies the lepton invariant mass distribution m at high energy hadron colliders
We show in figure 2 that how the EWIMP contribution modifies the lepton invariant mass distribution at the 13 TeV Large Hadron Collider (LHC), where the difference between the differential cross sections of the Drell-Yan process with and without the EWIMP contribution is shown as a function of the lepton invariant mass m = s1/2 for three EWIMP cases; Wino (Majorana fermion with the quantum number of 30), Higgsino (Dirac fermion with the quantum number of 2±1/2) and bosonic minimal dark matter with their masses fixed to be 300 GeV
Summary
We focus on the Drell-Yan process pp → + −+X in this paper with p and ± being a proton and a lepton, and discuss how EWIMP modifies the lepton invariant mass distribution m at high energy hadron colliders. We show in figure 2 that how the EWIMP contribution modifies the lepton invariant mass distribution at the 13 TeV LHC, where the difference between the differential cross sections of the Drell-Yan process with and without the EWIMP contribution (normalized by the SM prediction at LO) is shown as a function of the lepton invariant mass m = s1/2 for three EWIMP cases; Wino (Majorana fermion with the quantum number of 30), Higgsino (Dirac fermion with the quantum number of 2±1/2) and bosonic minimal dark matter (real scalar with the quantum number of 70) with their masses fixed to be 300 GeV. A constraint is put by the measurement of the W boson mass, which is obtained from the EWIMP oblique correction to various SM processes [64,65,66,67] This correction is approximately given as follows: δmW m. The constraint from the cross sections and the forward-backward asymmetries of various fermion pair production processes e+e− → f fat the LEP II experiment [72] is shown in the figure
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