Direct searches for new particles have so far not provided any answers either. If a new, more general theory existed, the Standard Model would be the effective lower-energy version of it. This would result in practice in small deviations, notably in the production cross sections, via virtual loops involving new massive particles. This is why the precise study of processes predicted by the Standard Model would make it possible to update the new physics. At LAPP, ATLAS researchers study several processes:
- The simultaneous production of two heavy W+Z bosons. This process makes it possible to study the vertices with three heavy bosons, and makes it possible to study the polarization of the W and Z bosons. Given the high precision that is now achieved in the measurements, it also makes it possible to constrain the MC simulations.
- Two-boson scattering, producing a four-heavy boson vertex, and characterized by the production of two heavy bosons and two hadronic jets in the final state. The two final states studied are Z+photon+2 jets and W+Z+2 jets. This process has a very small cross section and would be very sensitive to the presence of new physics, making it an ideal candidate for indirect research.
Contacts: Emmanuel Sauvan, Iro Koletsou, Lucia di Ciaccio, Narei Lorenzo Martinez
Recent publications:
- ATLAS Collaboration, "Evidence for electroweak production of two jets in association with a Zgamma pair in pp collisions at √s =13 TeV with the ATLAS detector"
- ATLAS Collaboration, "Observation of electroweak W±Z boson pair production in association with two jets in pp collisions at √s =13 TeV with the ATLAS detector".
- ATLAS Collaboration, "Measurement of WZ production cross sections and gauge boson polarisation in pp collisions at √s =13 TeV with the ATLAS detector".
- ATLAS Collaboration, "Studies of Zγ production in association with a high-mass dijet system in pp collisions at √s =8 TeV with the ATLAS detector".