Share this page!

Enter URL or ID to Unroll

You can paste full URL like: https://x.com/threadreaderapp/status/1644127596119195649
or just the ID like: 1644127596119195649

How to get URL link on X (Twitter) App

  1. On the Twitter thread, click on or icon on the bottom
  2. Click again on or Share Via icon
  3. Click on Copy Link to Tweet
  4. Paste it above and click "Unroll Thread"!
  5. More info at Twitter Help
Patrick Koppenburg 🐧 Profile picture
Patrick Koppenburg 🐧
@PKoppenburg
@_nikhef physicist on @lhcbexperiment at @CERN. 🟦: https://t.co/71HenrOvSD
Jul 18, 2024 • 19 tweets • 7 min read
Very complex and somewhat inconclusive LHCb result posted today. A #Thread 🧵 A bit of context: 20 years ago the BaBar and Belle experiments were seeing particles that looked like they were made of charm and anti-charm quarks but didn't fit anywhere. The first was the X(3872) in 2003. Image
May 28, 2024 • 17 tweets • 6 min read
A #thread on penguins. The ones in particle processes.

What's the difference between these two drawings? [1/17]
Image
Image Both are Feynman diagrams, a tool used to compute probabilities of particle processes.

In both cases a beauty (b) quark becomes a strange quark (s) and two muons (μ). The difference is inside, which is the stuff we do not see. [2/17]
Aug 24, 2023 • 13 tweets • 4 min read
A few more comments on the new Belle II result on B⁺→K⁺νν̅ and the fact that it comes out above the Standard Model prediction. 🧵 First this is an amazing analysis. The signal B meson decays to a kaon and all the rest is invisible. Your signal is a single kaon. What saves Belle is that they know there is another B meson in the event. And they try to understand this as well as possible. Image
Oct 18, 2022 • 26 tweets • 10 min read
It's been a while since I last wrote about lepton universality. The Standard Model assumes that all charged leptons - electrons, muons, taus - couple identically to all other particles except to the Higgs (that likes mass). Today we revisit that. A #Thread.
[1/21 - so far] Image There are some indications it may not be the case. In processes involving decays of b quarks to one or two muons we see discrepancies with the expectations. (Plots at nikhef.nl/~pkoppenb/anom…). Image
Apr 12, 2021 • 21 tweets • 8 min read
A #Thread about the most beautiful plot particle physics produces: The Bₛ⁰ meson oscillation plot: A showcase of quantum mechanics in action. 𝐖𝐡𝐚𝐭 𝐢𝐬 𝐢𝐭? The Bₛ⁰ meson is an unstable particle made of an anti-b quark and an s quark. It can transform into its anti-particle the B̅ₛ⁰ meson ("Bee-ess-bar"), made of a b quark and an anti-s quark.
Mar 23, 2021 • 33 tweets • 12 min read
Today is a special day for @LHCbExperiment and for me. A measurement which I started long ago stays stubbornly away from the theoretical expectation.

Is it time to open this bottle? It says "discovery" 🧐. Let's be cautions. Today's result will be presented by @yukawacoupling at 11h CET. Join at indico.cern.ch/event/976688/

Dec 10, 2020 • 21 tweets • 8 min read
Today @LHCbExperiment reports the first observation of the Bₛ⁰ → K⁻μ⁺ν process, in which a beauty-strange B meson decays to a muon and a strange kaon. It gives us access to Vub. A #thread. Vub is the weak-interaction coupling of beauty (b) to up (u) quarks. It's one of the fundamental transitions of the weak interaction. Image
Mar 21, 2019 • 23 tweets • 9 min read
Exciting news! @LHCbExperiment is announcing the observation of CP violation in charm decays. indico.cern.ch/event/807176/ What does that mean? A somewhat long thread. The laws of physics that affect us (gravity and electrodynamics) are left-right symmetric. One of the pictures below is mirror reversed. Physics doesn't let you tell which. (Social constructs may help: numbers, letters, watches, is the man left-handed?...)