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On the Role of LHC and HL-LHC in Constraining Flavor Changing Neutral Currents
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abstract
The Standard Model (SM) has no flavor-changing neutral current (FCNC) processes at the tree level. Therefore, processes featuring FCNC in new physics are tightly constrained by data. Typically, the lower bounds on the scale of new physics obtained from $K-\bar{K}$ or $B-\bar{B}$ mixing lie well above 10 TeV, surpassing the reach of current and future colliders. In this paper, we demonstrate, using a specific Z' model, that such limits can be severely weakened by applying certain parametrizations of the quark mixing matrices with no prejudice while maintaining the CKM matrix in agreement with the data. We highlight the valuable role of the often-overlooked D0 mixing in deriving robust FCNC limits and show that the LHC and HL-LHC are promising probes for flavor-changing interactions mediated by a Z' boson.
Forward citations
Cited by 2 Pith papers
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Type-II Seesaw Mechanism for Dirac Neutrinos and its Implications on $N_{\text{eff}}$ and Lepton Flavor Violation in a 3-3-1 model
A scalar sextet generates eV-scale Dirac neutrino masses in a 3-3-1 model, and the associated right-handed neutrino population constrains the Z' boson mass to exceed 4.4 TeV.
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LHC and HL-LHC Bounds on Visible and Invisible Decays in the $B-L$ Model
Using public ATLAS dilepton data, the B-L Z' is excluded below 4-6 TeV for g_BL=0.1-0.5, with limits relaxing when invisible decays are allowed and extending to about 7.5 TeV at HL-LHC.
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