I’m on shift at @cmsexperiment. And eating some stroopwafels!

“AI is actually brown people in a shed” part 6519

What is it like to collect data with the@CMSexperiment at #CERN? As the start of #ILoveDataWeek I figured I'd share how we GET to the data. The first step after all! (The Love Data Week celebrates research data and research data management researchdatasupport.ch/lovedata )

I‘m yet again on a long distance fast-ish train, this time a Swiss ECE, from Hamburg to Basel (on my way to do shifts at CERN). The German lady next to me is complaining that she can’t do an online check in of her ticket. My comment : instead we will arrive on time

I think there are a lot of academics who were knowingly attended dinners and lunches where they knew Epstein would be in the 2010s that are telling themselves that actually it's cool because it's not like they're pedophiles but by the 2010s he was an unrepentant convicted pedophile, folks

And I mean, I have gotten an email! From someone in the files!

Sleepy time? No I’m just faking it and wide awake… Or am I? I’m on a very early train to the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt where I will give the colloquium today. If you are there I look forward to seeing you (I will be more awake by then, guaranteed!) #science #physics

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

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

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

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

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

"Put a single woman in a group of men and she will feel awkward. Put a single man in a group of women and he will feel in charge." @athenedonald.bsky.social occamstypewriter.org/athenedonald...

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

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

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

I am at the FCC physics workshop this week, where we discuss what physics can be done if CERN manages to approve and find the funding to build this super-ambitious project. Many thanks to the organisers at the Max Planck Institute for Physics, it is a wonderful workshop. With great posters btw!

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

Very worrisome/ ik maak me steeds meer zorgen decorrespondent.nl/16689/linked...

Im tempting the weather gods today: Hanover->Munich during heavy snow. FCC physics workshop I’m on my way! Eventually….

LOL bordbistro guy when I pay for my coffee with Bahn Bonus Punkte (the frequent traveller points of the Deutsche Bahn): “Dann muss man doch ein Gin-Tonic nehmen!“ Good point. But I still have 15 more of these vouchers, I won’t last. #deutschebahn

This is how the massive steel structure for the new CMS calorimeter, HGCAL, was tested! 👷 Last summer the structure that will house the delicate HGCAL cassettes was assembled in Pakistan and rotated to test its integrity. 📽️ Watch the timelapse: youtu.be/Xs_RxGwwlC0

From decoding the human genome to exploring the universe, science has made huge strides in the 21st century. - www.nationalgeographic.com/science/arti...

Proud supervisor! Great job by Gabriele 🤩🍝⚛️😎 who will become a doctor tomorrow! www.instagram.com/reel/DT0dE0F...

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

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

As renaming geographic locations is a thing now I see an easy way to protect #Greenland. Just rename it to Epsteinland. You’re welcome.

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

If you got here because of nails 💅💅🏻💅🏼💅🏽💅🏾💅🏿, I totally understand! But of course I also deal with particle physics as that’s my day job 🤓😇👷‍♀️⚛️ Check out this nice post on #darkmatter on Instagram, prepared by DESY intern Sofia www.instagram.com/p/DTu2TdMCOj... #wisskomm #scicomm

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

I heard last week that the physics teacher of the daughter of one of my colleagues told the daughter that girls who do their nails don’t do physics. Sigh. So, here are the nails of an internationally leading particle physics professor. My nails. Don’t believe the gatekeepers! #womeninSTEM

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

You may have noticed that I stopped numbering the #CMSPapers I posted about. This is mostly because the numbering is kind of ambiguous. But we have published over 1400 papers (of which 1380+ on LHC data) since 2009 already! check them all out (searchable) here: cms-results-search.web.cern.ch

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

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

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

Am Montag gehe ich ins Gymnasium in Heimfeld. Und ich komme mit Teilchenphysik-Goodies! #WirWollensWissen #wisskomm #swag

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

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

cool nieuws item met de Vlaamse regering op CERN vrtnws.be/p.owAWNeAwLlY

Nice article about the (unexpected!) excess in the low mass top quark spectrum. A result with an important contribution from DESY btw :) physicsworld.com/a/cms-spots-...

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

Our summer students (and friends) are right: particle physics summer student programs are among the bucket-list activities for physics students. Registration for next summer opens now, and typically closes late January. For your convenience, here are some links for the programs world-wide:

Delighted that we can provide a voice to let young people talk about science, lab life, science communication and so much more! This is exactly the idea of this insta account, very excited to see the response

Eine weitere schöne wissenschaftliche Kommunikation zur Teilchenphysik aus Österreich. Cooles Projekt! 🤩 sound.orf.at/radio/oe1/se...

This #CMSPaper reports a #nullresult in signatures, as particles that don't show up in the @cmsexperiment are produced alongside particles that we can see. Those particles could be linked to dark matter, or new Higgs particles, or even more exotic undiscovered particles arxiv.org/abs/2510.12396

In particle physics and physics in general, some quantities are conserved for clear physical reasons . But some other things seem to be conserved even though there is no physics law prohibiting it.This #CMSPaper checks for such charged-lepton-number-violating decays arxiv.org/abs/2510.21559