The boundaries are some of the narrowest yet for the existence of third generation leptocarcinoma.
At the most basic level, matter is made up of two types of particles: leptons, such as electrons, and quarks, which combine to form protons, neutrons, and other composite particles. Under the Standard Model of particle physics, both leptons and quarks fall into three bands of increasing mass. Otherwise, the two types of particles are distinct. But some theories that extend the Standard Model predict the existence of new particles called leptoquarks that would unite quarks and leptons by interacting with both.
In a new paper, the CMS collaboration reports the results of its latest leptoquark search that will interact with third-generation quarks and leptons (upper and lower quarks, tau lepton and tau neutrino). Such third-generation leptocars are a possible explanation for a range of stresses with the Standard Model (or “anomaly”), which have been seen in certain particle transformations called meson B but have not yet been confirmed. There is therefore an additional reason to look for these hypothetical particles.
The CMS team requested the third-generation leptoquark in a proton-proton collision data sample produced by the Large Hadron Collider (LHC) with an energy of 13 TeV and recorded by the CMS experiment between 2016 and 2018. Specifically , the team looked for pairs of leptoquarks that turn into a top or bottom quark and a lepton or tau neutrino tau, as well as for single leptoquarks that are produced together with a neutrino tau and turn into a top quark and a lepton tau.
CMS researchers found no indication that such leptoquark were produced in the collision. However, they were able to set lower limits on their mass: they found that such leptocurrencies should be at least 0.98–1.73 TeV in mass, depending on their internal rotation and the strength of their interaction with a quark and a lepton. These boundaries are some of the tightest still in third-generation leptocurrencies and they allow to exclude a portion of the leptoquark mass range that may explain B-meson anomalies.
The search for leptoquarks continues.