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Creators/Authors contains: "Guzzi, Marco"

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  1. Free, publicly-accessible full text available March 1, 2025
  2. Abstract

    We consider$$Z'$$Zs in heterotic string derived models and study$$Z'$$Zresonant 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$$Z'$$Zcouplings. In particular, we study the impact ofZ-$$Z'$$Zkinetic-mixing interactions on forward-backward asymmetry ($$A_{FB}$$AFB) and other distributions at the LHC.

     
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  3. The future of collider physics is under investigation. With the High Luminosity LHC program lasting until the late 2030s, the next machine in the energy frontier is envisioned to appear in 30-40 years, which may be too far into the future to sustain the field. In this paper we explore the physics potential of an Upgraded Superconducting Super Collider (USSC). The Original Superconducting Super Collider (OSSC) was planned to operate at 20 TeV beam energy, and with improved magnet technology and/or longer tunnel, one may envision that it can be extended to 25-30 TeV beam energy. Given that the decision on the OSSC construction took place in Autumn 1988 and it was planned to start operation in the 1996-1999 period, an USSC can be constructed 10-15 years from construction and fill the gap between the end of HL-LHC and the future envisioned machines. While the main mission of the USSC will be to test the Standard Model and its electroweak and strongly interacting sectors, as a specific example we illustrate the invariant mass distribution at NNLO in QCD for a 5 TeV Z′ in the string derived Z′ model. 
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  4. Abstract

    We investigate the impact of sterile neutrinos on the decay rate of extra$$Z'$$Zs with mass in the TeV range in heterotic string derived models. We explore the impact of sterile neutrinos on the current$$Z'$$Zmass exclusion limits at the LHC, and how these bounds change when the parameter space of this specific class of models is modified.

     
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  5. We discuss the impact of heavy-flavor production measurements in semi-inclusive deep inelastic scattering at HERA on the CTEQ-TEA PDFs.In particular, we study the impact of the latest charm and bottom production measurements from the H1 and ZEUS collaborations on the gluon, and the interplay of these measurements with the data ensemble of the recent CT18 global QCD analysis. 
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  6. Sissa (Ed.)
    We discuss recent CTEQ-TEA group activities after the publication of the CT18 global analysis of parton distribution functions (PDFs) in the proton. In particular, we discuss a new calculation for the photon content in the proton, termed as CT18lux and CT18qed PDFs, and the impact of novel charm- and bottom-quark production cross section measurements at HERA on the CT18 global analysis. 
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  7. Bruno, G.E. ; Chiodini, G. ; Colangelo, P. ; Corianò, C. ; Creanza, D.M. ; De Fazio, F. ; Nappi, E. (Ed.)
    We discuss heavy-flavor production at hadron colliders in recent global QCD analyses to determine parton distribution functions (PDFs) in the proton. We discuss heavy-flavor treatments in precision theory predictions at the LHC. In particular, we discuss factorization schemes in presence of heavy flavors in proton-proton collisions, as well as the impact of heavy-flavor production at the LHC on PDFs. We show results of recent updates beyond CT18, the latest global QCD analysis from the CTEQ-TEA group. 
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  8. We review progress in the global QCD analysis by the CTEQ-TEA group since the publication of CT18 parton distribution functions (PDFs) in the proton. Specifically, we discuss comparisons of CT18 NNLO predictions with the LHC 13 TeV measurements as well as with the FNAL SeaQuest and BNL STAR data on lepton pair production. The specialized CT18X PDFs approximating saturation effects are compared with the CT18sx PDFs obtained using NLL/NLO small-$x$ resummation. Short summaries are presented for the special CT18 parton distributions with fitted charm and with lattice QCD inputs. A recent comparative analysis of the impact of deuteron nuclear effects on the parton distributions by the CTEQ-JLab and CTEQ-TEA groups is summarized. 
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