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Abstract s in heterotic string derived models and study$$Z'$$ resonant production at the TeV scale at the Large Hadron Collider (LHC). We use various kinematic differential distributions for the Drell–Yan process at NNLO in QCD to explore the parameter space of such models and investigate$$Z'$$ couplings. In particular, we study the impact of$$Z'$$ Z - kinetic-mixing interactions on forward-backward asymmetry ($$Z'$$ ) and other distributions at the LHC.$$A_{FB}$$ -
Abstract We investigate the impact of sterile neutrinos on the decay rate of extra
s with mass in the TeV range in heterotic string derived models. We explore the impact of sterile neutrinos on the current$$Z'$$ mass exclusion limits at the LHC, and how these bounds change when the parameter space of this specific class of models is modified.$$Z'$$ -
Abstract We study QCD corrections for the associated production of a single top quark and a photon (
production) at hadron colliders. We calculate the NLO cross section at LHC and future collider energies for a variety of kinematical cuts, and we estimate uncertainties from scale dependence and from parton distributions. We also calculate differential distributions in top-quark transverse-momentum and rapidity as well as photon energy. Finally, we study higher-order corrections from soft-gluon emission for this process, and we provide approximate NNLO (aNNLO) results for the cross section and top-quark differential distributions. We also compare our calculations with recent measurements from CMS and ATLAS at the LHC and find that the aNNLO corrections improve the comparison between the data and the Standard Model predictions.$$tq\gamma $$ -
Free, publicly-accessible full text available August 1, 2024
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Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe standard model (SM) processes and search for physics beyond the standard model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physics signals that can be uniquely probed in the forward region. FPF experiments will be sensitive to a broad range of BSM physics through searches for new particle scattering or decay signatures and deviations from SM expectations in high statistics analyses with TeV neutrinos in this low-background environment. High statistics neutrino detection will also provide valuable data for fundamental topics in perturbative and non-perturbative QCD and in weak interactions. Experiments at the FPF will enable synergies between forward particle production at the LHC and astroparticle physics to be exploited. We report here on these physics topics, on infrastructure, detector, and simulation studies, and on future directions to realize the FPF’s physics potential.more » « less