Patrick Koppenburg 🐧
@koppenburg.ch
Nikhef physicist at LHCb Experiment at CERN. Exotic Hadrons, European strategy for particle physics, Sustainable Accelerators. Chair of CERN users committee ACCU.
🐧📷🎓💻💫.
Born at 327.55 ppm CO₂. Président du PVL La Côte. 🟢🔵
🐧📷🎓💻💫.
Born at 327.55 ppm CO₂. Président du PVL La Côte. 🟢🔵
Very uninformative sign on the motorway by Geneva. Halle 6 of what?
November 13, 2025 at 7:50 AM
Very uninformative sign on the motorway by Geneva. Halle 6 of what?
I did not expect orthopaedics to appear on hep-ex 😅
November 10, 2025 at 7:55 AM
I did not expect orthopaedics to appear on hep-ex 😅
Indeed the observation of the Higgs boson was announced 37 years later, on July 4 2012. John Ellis was in the room. I don't know where Gaillard and Nanopoulos were at that time. /end
November 7, 2025 at 8:43 AM
Indeed the observation of the Higgs boson was announced 37 years later, on July 4 2012. John Ellis was in the room. I don't know where Gaillard and Nanopoulos were at that time. /end
They ended the paper with a note of caution: Finding the Higgs boson will be hard.
November 7, 2025 at 8:42 AM
They ended the paper with a note of caution: Finding the Higgs boson will be hard.
At that times the heaviest known particles were charm bound states, like the ψ(2S), at masses around 4 GeV. Everything above was "new particles", including the now well known b quark, and the W and Z bosons.
November 7, 2025 at 8:42 AM
At that times the heaviest known particles were charm bound states, like the ψ(2S), at masses around 4 GeV. Everything above was "new particles", including the now well known b quark, and the W and Z bosons.
At that time nobody knew what the mass of the Higgs boson would be. It could be anything. So they computed the possible decay modes and their rates depending on the Higgs mass.
They didn't dare going beyond a mass of 100 GeV.
They didn't dare going beyond a mass of 100 GeV.
November 7, 2025 at 8:42 AM
At that time nobody knew what the mass of the Higgs boson would be. It could be anything. So they computed the possible decay modes and their rates depending on the Higgs mass.
They didn't dare going beyond a mass of 100 GeV.
They didn't dare going beyond a mass of 100 GeV.
On this day 50 years ago, John Ellis, Mary K. Gaillard and Dimitri Nanopoulos submitted the paper "A Phenomenological Profile of the Higgs Boson" which was first to tell experimentalists how to find the Higgs boson.
#OTD #historyofphysics #physics ⚛️🧪
#OTD #historyofphysics #physics ⚛️🧪
November 7, 2025 at 8:42 AM
On this day 50 years ago, John Ellis, Mary K. Gaillard and Dimitri Nanopoulos submitted the paper "A Phenomenological Profile of the Higgs Boson" which was first to tell experimentalists how to find the Higgs boson.
#OTD #historyofphysics #physics ⚛️🧪
#OTD #historyofphysics #physics ⚛️🧪
Mond ist auch für eine gute Kamera schwierig. Es ist ein Tageslicht Bild (auf dem Mond ist es hell) im Dunkeln. Ich brauche immer Handeinstellungen.
November 6, 2025 at 11:15 AM
Mond ist auch für eine gute Kamera schwierig. Es ist ein Tageslicht Bild (auf dem Mond ist es hell) im Dunkeln. Ich brauche immer Handeinstellungen.
November 6, 2025 at 6:38 AM
Oui mais ça c'était vers 2006 quand il n'y avait que l'aimant. Maintenant on voit surtout les structures de support.
November 5, 2025 at 8:20 PM
Oui mais ça c'était vers 2006 quand il n'y avait que l'aimant. Maintenant on voit surtout les structures de support.
Still life with moka pot.
My picture, AI enhanced.
My picture, AI enhanced.
October 30, 2025 at 8:00 AM
Still life with moka pot.
My picture, AI enhanced.
My picture, AI enhanced.
October 29, 2025 at 1:30 PM
🧐 There is a direct link from #grokipedia to my website, but accessed in 2021.
October 28, 2025 at 11:40 AM
🧐 There is a direct link from #grokipedia to my website, but accessed in 2021.
🎵 Snow on the Jura 🎵🎸
October 28, 2025 at 7:13 AM
🎵 Snow on the Jura 🎵🎸
On trouve de ces trucs quand on range un peu. @itspetergabriel.bsky.social
October 27, 2025 at 8:04 PM
On trouve de ces trucs quand on range un peu. @itspetergabriel.bsky.social
Nothing significant. It just goes in the same direction as the same ratio in B⁺ and B⁰ decays.
October 27, 2025 at 7:09 AM
Nothing significant. It just goes in the same direction as the same ratio in B⁺ and B⁰ decays.
🤔 CMS also measure R(J/ψ) on the high side. That's the ratio of Bc⁺→J/ψτν to
Bc⁺→J/ψμν. LHCb saw an excess compared to the Standard Model, now CMS has it too.
arxiv.org/pdf/2510.21559
Bc⁺→J/ψμν. LHCb saw an excess compared to the Standard Model, now CMS has it too.
arxiv.org/pdf/2510.21559
October 27, 2025 at 7:09 AM
🤔 CMS also measure R(J/ψ) on the high side. That's the ratio of Bc⁺→J/ψτν to
Bc⁺→J/ψμν. LHCb saw an excess compared to the Standard Model, now CMS has it too.
arxiv.org/pdf/2510.21559
Bc⁺→J/ψμν. LHCb saw an excess compared to the Standard Model, now CMS has it too.
arxiv.org/pdf/2510.21559
If football players were ranked like scientists, based on statistical data, this would be the ideal premier league team. No keeper, no defender.
October 27, 2025 at 6:22 AM
If football players were ranked like scientists, based on statistical data, this would be the ideal premier league team. No keeper, no defender.
Finally the rumours become public: The CEPC Chinese collider project is on hold.
cerncourier.com/a/cepc-matur...
cerncourier.com/a/cepc-matur...
October 26, 2025 at 12:39 PM
Finally the rumours become public: The CEPC Chinese collider project is on hold.
cerncourier.com/a/cepc-matur...
cerncourier.com/a/cepc-matur...
135 à 0 pour le service citoyen. @pvlfr.bsky.social
October 25, 2025 at 10:09 AM
135 à 0 pour le service citoyen. @pvlfr.bsky.social
Assemblée des délégués @pvlfr.bsky.social @grunliberale.bsky.social à Delémont.
Merci à @pvljura.bsky.social pour l'accueil.
Merci à @pvljura.bsky.social pour l'accueil.
October 25, 2025 at 8:22 AM
Assemblée des délégués @pvlfr.bsky.social @grunliberale.bsky.social à Delémont.
Merci à @pvljura.bsky.social pour l'accueil.
Merci à @pvljura.bsky.social pour l'accueil.
Same venue, different conferences: 2018 LHCb week and 2025 linear collider workshop.
October 21, 2025 at 2:46 PM
Same venue, different conferences: 2018 LHCb week and 2025 linear collider workshop.
Didn't know the multiverse was getting so popular.
#notthatone
#notthatone
October 19, 2025 at 10:09 AM
Didn't know the multiverse was getting so popular.
#notthatone
#notthatone
In particular, the rate of B mesons to one tau lepton is higher than the prediction: the Standard Model predictions (the crosses) are outside of the red blob (the data). If that's the case for one tau, it should also be visible for two taus.
October 16, 2025 at 9:00 AM
In particular, the rate of B mesons to one tau lepton is higher than the prediction: the Standard Model predictions (the crosses) are outside of the red blob (the data). If that's the case for one tau, it should also be visible for two taus.