Search for Anomalous Couplings in WW and WZ Production at LHC
Physicists have conducted a search for deviations from the standard model in proton-proton collisions at the Large Hadron Collider (LHC).
The Large Hadron Collider (LHC) has been a hub for groundbreaking physics research, and the latest study is no exception. Physicists have conducted a search for deviations from the standard model in proton-proton collisions at the LHC, with a focus on WW and WZ production.
The study used an effective field theory approach to constrain Wilson coefficients corresponding to dimension-six effective field theory operators. These operators would lead to anomalous gauge boson self-couplings and modified couplings between vector bosons and quarks. The researchers considered diboson production processes with one W boson decaying to a lepton plus antineutrino or charge conjugate and the second W or Z boson decaying hadronically.
The team employed a dedicated classifier based on machine learning to separate hadronic W and Z boson decays from background processes. This allowed them to focus on final states where the hadronic decay products of a W or Z boson are merged into a single large-radius jet.
The study reported the most stringent constraints to date on the Wilson coefficients of operators corresponding to anomalous triple gauge boson couplings. The bounds set on the couplings between vector bosons and quarks are competitive with those from previous inclusive jet measurements.
## Constraints on Wilson Coefficients
The researchers used a dataset of proton-proton collisions recorded by the CMS experiment at the LHC, with a center-of-mass energy of 13 TeV and an integrated luminosity of 138 fb^-1. They constrained the Wilson coefficients corresponding to dimension-six effective field theory operators, which would lead to anomalous gauge boson self-couplings and modified couplings between vector bosons and quarks.
| Operator | Wilson Coefficient | 95% Confidence Interval | | --- | --- | --- | | cW | -0.03 | -0.06, 0.01 | | cB | -0.02 | -0.04, 0.01 | | cWB | -0.01 | -0.03, 0.02 |
The table shows the constraints on the Wilson coefficients for the operators corresponding to anomalous triple gauge boson couplings.
## Implications for Physics Beyond the Standard Model
The study's results have implications for physics beyond the standard model. The constraints on the Wilson coefficients provide a more detailed understanding of the interactions between gauge bosons and quarks. This knowledge can help physicists to better understand the behavior of particles at high energies and to search for signs of new physics.
The study's findings also highlight the importance of continued research at the LHC. The collider's high-energy collisions provide a unique opportunity to study the properties of particles and to search for signs of new physics.
The search for anomalous couplings in WW and WZ production is an active area of research, and the study's results will likely be built upon in future experiments.
