Lmst

#CMSpaper soon on arXiv: Influence of strangeness on the anisotropic flow of prompt D^±_s mesons in PbPb collisions at √(s_NN) = 5.02 TeV (CERN-EP-2025-250) https://cds.cern.ch/record/2954794 #HeavyIons

Missing momentum is effectively the only way that the main detectors at the LHC (like CMS) can measure the indirect signs of neutrinos (or undiscovered particles). This #CMSPaper present how we use #machinelearning to make our missing momentum measurement much, much better: arxiv.org/abs/2509.12012

Plot showing how the Deepmet algorithm improves the missing energy reconstruction of the very well-known W boson particle. Compared to the previous best algorithms (it's really very good!)

This #CMSPaper examines the missing energy from neutrino pairs in top quark pair production. Accurate measurement of those neutrinos is crucial for simulating top quarks in the standard model and for setting constraints on invisible particle production with top quarks. arxiv.org/abs/2510.00160

distribution of the missing energy at low-ish values, for different angles between the (reconstructed, so after loads of math/machine learning) neutrinos. Back-to-back is difficult...

#CMSpaper: High-level hadronic tau lepton triggers of the CMS experiment in proton-proton collisions at √s = 13.6 TeV (arXiv:2602.11359) https://arxiv.org/abs/2602.11359 #Taus #TauLeptons

This #CMSPaper investigates different #AI #machinelearning methods that aim to find jets that are inconsistent with the standard model. It shows that a new method called #Wasserstein normalized autoencodes works much better than other neural networks arxiv.org/abs/2510.02168

The LHC recently collided Oxygen and Neon ions. That is an important input to understanding how nuclear interactions change depending on the size of the colliding objects. This #CMSPaper observes "collective flow", essentially a sign of the quark gluon plasma, in those collisions buff.ly/NcLWdAj

showing how the flow changes versus how central the collision is (50% is heads on nuclei, 0% is skimming nuclei)

#CMSpaper soon on arXiv: High-level hadronic tau lepton triggers of the CMS experiment in proton-proton collisions at √s = 13.6 TeV (CERN-EP-2026-008) https://cds.cern.ch/record/2954599 #Taus #TauLeptons

#CMSpaper soon on arXiv: Measurement of B meson production fraction ratios in proton-proton collisions at √s = 13 TeV using open-charm and charmonium decays (CERN-EP-2025-176) https://cds.cern.ch/record/2954592 #BPhysics

#CMSpaper: Probing early parton emissions in heavy ion collisions using the Lund jet plane (arXiv:2602.09271) https://arxiv.org/abs/2602.09271 #HeavyIons

The production of top quark pairs together with a W boson is a great way to test the quality of standard model predictions. This #CMSPaper measures provides boundaries on things like the difference between ttW+/- production, a very sensitive quantity to test the predictions arxiv.org/abs/2509.13512

The production of the Higgs boson along with an undiscovered hypothetical particle is an important signature for detecting physics beyond the standard model. This #CMSPaper looks for the "Higgs boson+jet not consistent with the standard model" signature (we didn't see any): arxiv.org/abs/2509.13635

distribution of anomalous jets. None are seen.

#CMSpaper: Probing early parton emissions in heavy ion collisions using the Lund jet plane (CMS-HIN-24-016) https://cds.cern.ch/record/2954350 #HeavyIons

Are there undiscovered particles (that are very light for LHC standard) produced in Higgs boson decays? This #CMSPaper describes how we look for them, but did not see any arxiv.org/abs/2508.06947

invariant mass distribution that is nicely falling. The data agrees with the blue prediction (which is the standard model). The scenarios considered would modify these signatures dramatically (other coloured lines)

#CMSpaper soon on arXiv: Probing early parton emissions in heavy ion collisions using the Lund jet plane (CERN-EP-2025-260) https://cds.cern.ch/record/2954350 #HeavyIons

If you need a reference model of what an extension of the standard model with many new particles would look like, Supersymmetry is a good benchmark. This #CMSPaper shows a general search in many standard signatures, looking for deviations spread over different signatures arxiv.org/abs/2508.13900

competitive limits on supersymmetric lepton partners (aka sleptons)

Are there invisible (and long-lived) undiscovered particles produced in the decays of B mesons? Those would be super rare, so we use a huge dataset of B mesons with dedicated data taking techniques. We didn't see any new particles though, this #CMSPaper is a #nullresult arxiv.org/abs/2508.06363

limit plot, measuring that in the most sensitive scenarios that if such an undiscovered particle exists, it shows up in fewer than 1/10000 B mesons

The LHC produces a large number of Z bosons. So it is worthwhile checking if some of them behave inconsistently with the standard model. This #CMSPaper measured that the chance that Z bosons decay to two different kinds of leptons is smaller than one in 10 million arxiv.org/abs/2508.07512

searchign the e-mu invariant mass for a Z boson peak. No sign.

This #CMSPaper explores the excitation of three particles with a B quark and other quark, examining how they store extra energy beyond the ground state. It marks the first simultaneous measurement of these particles. This improves knowledge of particles that contain quarks arxiv.org/abs/2508.05820

Want to know how to actually collect undiscovered long lived particles so we can maybe then discover them? Then check out this #cmspaper, with a large contribution from people in my team arxiv.org/abs/2601.17544

Plots showing how well CMS can identify electrons that don’t come from the center of the detector. (Those could come from undiscovered particles for example)

#CMSpaper: Observation of Υ(1S) + Z associated production and measurement of the effective double-parton scattering cross section in proton-proton collisions at √s = 13 TeV (arXiv:2602.02770) https://arxiv.org/abs/2602.02770 #BPhysics

#CMSpaper

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