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• Physics 15, s105
The ATLAS Collaboration has detected triple W-boson manufacturing—a uncommon occasion that would finally provide indicators of latest physics.
CERN
The World Broad Net was invented at CERN in 1989 as a approach to share information from particle-physics experiments. Now a kind of experiments, ATLAS, is sharing information that carries the label “WWW” for a unique purpose. Sifting via 20 billion proton-proton collisions from Run 2 at CERN’s Giant Hadron Collider (LHC), the ATLAS crew has recognized round 270 occasions producing three W bosons [1]. By measuring these uncommon occasions, the researchers have supplied one other high-precision check of the usual mannequin of particle physics—particularly, relating to boson-boson interactions.
In the usual mannequin, bosons carry the elemental forces: for instance, W and Z bosons carry the weak drive, whereas photons carry the electromagnetic drive. The brand new measurements are usually not the primary by which three weak-force bosons have been noticed in particle collisions (see Synopsis: Hat Trick Commentary for Bosons). Nevertheless, that is the primary time that observers have pinpointed that the bosons are W’s, fairly than a combination of W’s and Z’s. By extracting W-only occasions, the ATLAS crew was capable of goal particular interactions, together with ones the place a single W decays into three lower-energy W’s. These interactions might probably be delicate to hypothetical particles that aren’t predicted in the usual mannequin.
At collision energies of 13 TeV, the ATLAS crew measured the WWW cross part (a measure of the likelihood of this occasion) to be 820 femtobarns, which is barely increased than the usual mannequin prediction. To inform whether or not this overproduction is actual or only a statistical fluke, researchers will want extra information, which is prone to come from the lately began LHC Run 3 (see Analysis Information: Good Omens for Run 3).
–Michael Schirber
Michael Schirber is a Corresponding Editor for Physics Journal primarily based in Lyon, France.
References
- G. Aad et al. (ATLAS Collaboration), “Commentary of WWW manufacturing in pp collisions at with the ATLAS detector,” Phys. Rev. Lett. 129, 061803 (2022).
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