Just seeing Higgs bosons is not really enough to check how consistent it is with the predictions of the standard model. This #CMSPaper compares the kinematic behaviour of Higgs bosons for different decay signatures - to check consistency in production and decay arxiv.org/abs/2504.13081

More than 99% top quarks decay to a W boson+bottom quark. This #CMSPaper checks top quark decays to Higgs boson+light quark. The standard model predicts that's super-rare, but many new physics models predict it happens more. We measure it as less than 0.056% of top quarks.

arxiv.org/abs/2407.15172

Particle physicists use simulations to distinguish new findings from background collisions at the LHC. This #CMSPaper examines the effectiveness of these simulations, identifying their strengths and weaknesses to select the best tools for specific tasks. More at arxiv.org/abs/2505.17850

The super-rare creation of three quantum-force particles simultaneously allows a direct test of quantum interactions between the carriers of forces. This #CMSpaper observes this for the first time in the LHC Run 3 dataset (for WWZ production) and combines with older data arxiv.org/abs/2505.20483

In the weak force, there are subtle differences between the behaviour of matter and antimatter (through an effect called CP violation). This #CMSPaper uses #machinelearning to check if this also happens for top quarks https://arxiv.org/abs/2505.21206

The Higgs boson in its diphoton decay signature is a very precise and well understood way to study Higgs bosons, but that signature is super rare. This #CMSPaper uses this signature to measure the Higgs boson production rate and kinematic behaviour in the LHC Run 3 data arxiv.org/abs/2504.17755

Jets, particle sprays coming from quarks and gluons, can't easily pass through the blob that is the quark-gluon plasma, a phenomenon called "jet quenching". This #CMSPaper investigates if that also happens with an alternative method where the angles between two jets are used arxiv.org/abs/2504.08507

We are always looking for new particles that we can use to study the quark gluon plasma. This #CMSPaper shows the phi meson (a bound state consisting of a strange quark and strange antiquark) is quite a useful "hard probe" (I know, jargon) to measure the QGP in an extra way arxiv.org/abs/2504.05193

You may have noticed that I stopped numbering the #CMSPaper I posted about. This is mostly because the numbering is kind of ambiguous. But we have published over 1400 papers (of which 1370+ on LHC data) since 2009 already!

check them all out (searchable) here: https://cms-results-search.web.cern.ch

(and if you are on CMS: I'm looking for someone to help with maintaining that search page!!!)

In the weak force, there are subtle differences between the behaviour of matter and antimatter (through an effect called CP violation). This #CMSPaper uses #machinelearning to check if this also happens for top quarks https://arxiv.org/abs/2505.21206 there are some discrepancies compared to what is expected, but not enough for experimental particle physicists to get excited (we need 3 sigma after correcting for sampling bias for that, and this deviation is 2.5 sigma without statistics corrections)

There are many clear signs of #darkmatter from cosmology and astrophysics. This #CMSPaper 1393 looks whether we can make dark matter in LHC collisions, in collisions where one top quark is made potentially with dark matter. We did not see any signs of that in that signature arxiv.org/abs/2503.20033

#CMSpaper soon on arXiv: Search for the rare decay D⁰ → μ⁺μ⁻ in proton-proton collisions at √s = 13.6 TeV (CERN-EP-2025-108) https://cds.cern.ch/record/2935183 #BPhysics

The Higgs boson in its diphoton decay signature is a very precise and well understood way to study Higgs bosons, but that signature is super rare. This #CMSPaper uses this signature to measure the Higgs boson production rate and kinematic behaviour in the LHC Run 3 data arxiv.org/abs/2504.17755

The W and Z boson, the "photons of the weak force" still carry important and previously unknown information, particularly on how quarks and gluons in protons behave (and stick together) at the high energies of the LHC. This #CMSpaper 1390 measures W and Z boson production arxiv.org/abs/2503.09742

Jets, particle sprays coming from quarks and gluons, can't easily pass through the blob that is the quark-gluon plasma, a phenomenon called "jet quenching". This #CMSPaper investigates if that also happens with an alternative method where the angles between two jets are used arxiv.org/abs/2504.08507

#CMSPaper 1398 is a meta-analysis of CMS results with Higgs bosons, Z and W bosons, and top quarks. It is interpreted in the Standard Model Effective theory looking for subtle changes with respect to the standard model predictions that are seen over more than one signature arxiv.org/abs/2504.02958

We are always looking for new particles that we can use to study the quark gluon plasma. This #CMSPaper shows the phi meson (a bound state consisting of a strange quark and strange antiquark) is quite a useful "hard probe" (I know, jargon) to measure the QGP in an extra way arxiv.org/abs/2504.05193

#CMSPaper 1395 observes a totally unexpected extra behaviour of #topquark pair production; we see significantly more top quarks than we expect, and they kind of behave like they come from something particle-like. We are reluctant to just call it Topponium, but very exciting! arxiv.org/abs/2503.22382

The super-rare creation of three quantum particles of the forces (W bosons, Z bosons, photons) simultaneously allows a direct test of quantum interactions between the carriers of forces. This #CMSpaper measures this for the first time in the LHC Run 3 dataset (for WWZ production) and sets limits (uncertainties: 30-ish percent, using all data we have up to now) on what interactions are observed between these particles https://arxiv.org/abs/2505.20483

Particle physicists use simulations to distinguish new findings from background collisions at the LHC. This #CMSPaper examines the effectiveness of these simulations, identifying their strengths and weaknesses when simulating the most common background at the LHC, low(ish) energy proton-proton collisions. Which is why this paper is important, this allows us to pick the right tool for the right job :) More at https://arxiv.org/abs/2505.17850