Freya Blekman
@freyablekman.bsky.social
Particle physicist at @CMSExperiment at @CERN - Lead Scientist DESY & Professor of Physics University of Hamburg - World citizen ➡🇳🇱🇺🇸 🇬🇧🇨🇭🇧🇪🇩🇪
Posts: #physics #SciComm + academia/tech stuff + my opinions + summaries of #CMSpapers
Posts: #physics #SciComm + academia/tech stuff + my opinions + summaries of #CMSpapers
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 )
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 )
February 7, 2026 at 8:39 AM
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 )
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 )
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
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
February 3, 2026 at 5:39 AM
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
February 2, 2026 at 6:47 PM
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
February 2, 2026 at 5:47 PM
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
February 1, 2026 at 11:03 AM
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
February 1, 2026 at 9:03 AM
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
January 31, 2026 at 10:12 AM
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
January 31, 2026 at 9:12 AM
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
January 30, 2026 at 9:42 PM
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
January 30, 2026 at 8:42 PM
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
January 29, 2026 at 9:19 PM
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
January 29, 2026 at 8:19 PM
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!
With great posters btw!
January 29, 2026 at 11:02 AM
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!
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
January 28, 2026 at 9:47 PM
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
January 28, 2026 at 7:47 PM
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
I‘m on an ICE train. Today with bonus ice on the outside
January 26, 2026 at 9:17 AM
I‘m on an ICE train. Today with bonus ice on the outside
Im tempting the weather gods today: Hanover->Munich during heavy snow.
FCC physics workshop I’m on my way! Eventually….
FCC physics workshop I’m on my way! Eventually….
January 26, 2026 at 8:59 AM
Im tempting the weather gods today: Hanover->Munich during heavy snow.
FCC physics workshop I’m on my way! Eventually….
FCC physics workshop I’m on my way! Eventually….
Proud supervisor! Great job by Gabriele 🤩🍝⚛️😎 who will become a doctor tomorrow!
www.instagram.com/reel/DT0dE0F...
www.instagram.com/reel/DT0dE0F...
January 22, 2026 at 5:13 PM
Proud supervisor! Great job by Gabriele 🤩🍝⚛️😎 who will become a doctor tomorrow!
www.instagram.com/reel/DT0dE0F...
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
January 21, 2026 at 9:47 PM
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
January 21, 2026 at 7:47 PM
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
January 20, 2026 at 9:05 PM
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
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
January 20, 2026 at 8:05 PM
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
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
January 19, 2026 at 6:47 PM
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
So, here are the nails of an internationally leading particle physics professor. My nails.
Don’t believe the gatekeepers! #womeninSTEM
January 19, 2026 at 12:17 PM
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
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
January 18, 2026 at 11:03 AM
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