#CMSPaper 1299 measures the momentum of Higgs bosons. As kinematic properties of particles are affected by higher-order quantum effects, this is a very good way to measure the standard model and check if the behavior agrees. But even in the tau-tau final state we still don't have so many Higgs bosons, so still very large uncertainties https://arxiv.org/abs/2403.20201
Time to do my daily German vocab practice with some tasty Swiss pastry- and then to another shift to take data with @CMSexperiment (the last one of this block)
Are there undiscovered heavy particles decaying to #Higgsbosons? #CMSPaper 1297 is an overview paper with all searches for Higgs boson resonances (as the Higgs boson can decay in many ways, there are also many signatures to examine). Such resonances would exist in scenarios with extra dimensions, more Higgs bosons, more W or Z bosons, and even if gravitons would exist and made at the LHC! We did not see any, so give constraints on what is still consistent with the data https://arxiv.org/abs/2403.16926
The frequency of simultaneous production of two Higgs bosons would allow us to directly measure the (Brout-Englert-)Higgs field at the LHC. We don't see it yet, and this specific #CMSPaper 1293 looks for it in the very common bbWW signature: https://arxiv.org/abs/2403.09430
There are a lot of composite particles containing b quarks, and their decay is interesting (the LHC even has a dedicated experiment to study them, @LHCbExperiment). But are there undiscovered particles (for example, extra undiscovered neutrinos) hiding in those B meson decays? #CMSPaper 1291 checks, and did not see any. https://arxiv.org/abs/2403.04584
The top quark is super heavy, and no one knows why. #CMSPaper 1289 is an overview of top quark measurements by the CMS experiment. It is also possible to measure that mass in many ways as a consistency check (that helps us understand it if those methods are all very different) https://arxiv.org/abs/2403.01313
#CMSPaper 1287 looks for undiscovered extra neutrinos, in signatures with many leptons (including taus, see plot, very few events). It is a #nullresult that sets very stringent bounds on heavy neutral leptons and majorana neutrinos https://buff.ly/3U7LYgZ
Quarks can only decay to other flavour quarks via W bosons. This #CMSPaper 1286 studies whether, very rarely, top quarks decay differently, specifically top quarks to two other quarks and a charged lepton. It sets the world's strongest constraints, improving our knowledge by three to six orders of magnitude 💪 https://arxiv.org/abs/2402.18461
#CMSpaper 1285: The LHC has the potential to make many particles, including some very frequent ones like the W boson. But what if these W bosons decay to undiscovered neutrinos? This result looks for those, specifically focusing on those sterile neutrinos leaving a signature in the CMS muon system https://arxiv.org/abs/2402.18658
#CMSpaper 1284 studies the cascade or Ξb particle, a particle that consists of a bottom, strange, and light (up or down)quark. Studying these composite quark systems, and particularly how they are stable/fall apart, teaches us more about the strong force https://buff.ly/443vyuI
Interpreting the LHC collisions is extremely data-intensive, and #CMSPaper 1282 describes how modern software techniques so our software (and #machinelearning) can run on many different platforms/processors and still efficiently and transparently reconstruct our collisions https://arxiv.org/abs/2402.15366
#CMSPaper 1278 looks at the #Higgsboson differently: Are there other particles that it decays to? In this case, there would be a more complicated Higgs field and more than one Higgs boson (so they can decay to each other then), for example, in two Higgs doublet models. Experimentally, we look for a four-particle resonance at the 125 Higgs mass that can decay to a combination of two muons, two taus, or two b quarks. There is nothing there, but there is not so much data yet https://arxiv.org/abs/2402.13358
#CMSPaper 1267: Other experiments (like LHCb) see #flavourAnomalies differences between leptons in (amongst other) decays of bound particles containing a b quark and other quarks. This paper measures the difference in those decays between decays of B mesons to Kaons and two leptons, R(K). The result is consistent with the standard model and discrepancies both, but with large uncertainties https://arxiv.org/abs/2401.07090