Abstract
The study of electroweak boson pair production provides a powerful test of the spontaneously broken gauge symmetry of the Standard Model (SM) and can be used to search for new phenomena beyond the SM. Extra neutral vector bosons $Z'$ decaying to charged gauge vector boson pairs $W^+W^-$ are predicted in many scenarios of new physics, including models with an extended gauge sector. The diboson production allows to place stringent constraints on the $Z$-$Z'$ mixing factor $\xi$ and $Z'$ mass, $M_{Z'}$. We present the $Z'$ exclusion region in the $\xi-M_{Z'}$ plane for the first time by using data comprised of $pp$ collisions at $\sqrt{s}=13$ TeV and recorded by the ATLAS and CMS detectors at the CERN LHC, with integrated luminosities of 13.2 and 35.9 fb$^{-1}$, respectively. The exclusion region has been significantly extended compared to that obtained from the previous analysis performed with Tevatron data as well as with LHC data collected at 7 and 8 TeV. Also, we found that these constraints on the $Z$-$Z'$ mixing factor are more severe than those derived from the global analysis of electroweak data. Further improvement on the constraining of this mixing can be achieved from the analysis of data to be collected at higher luminosity.
Highlights
Cold (1 mK–1 K) and ultracold (
The probabilities of vibronic transitions were determined from the potential-energy functions (PEFs) of RbYb [9] and CsYb [10] ground and lower excited electronic states that were calculated earlier using CASSCF/XMCQDPT2 multi-reference perturbation theory
Dipole moments of electronic transitions between ground X 2Σ1+/ 2 and excited states arising from electronic configurations of atoms at dissociative limits III and IV and V were different from zero only at small (3.5–8 Å) internuclear distances R (Fig. 2 and [9]) because the corresponding transitions at the dissociative limits were forbidden by selection rules for the atoms
Summary
Cold (1 mK–1 K) and ultracold (
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