417 Followers
259 Following
Theoretical particle physicist, University professor, book author, and sometimes blogger. Now a Department Chair at USC!
Nuclear reactor on the Moon! 🧪
EXCLUSIVE: Sean Duffy will announce expedited plans to build a nuclear reactor on the moon, his first major action as interim NASA administrator.
This is the first major agency effort by the interim NASA administrator, who is also the Transportation secretary and a former Fox News host.
Is it the name of a cat or the name of a particle physics experiment? forms.gle/f3mGxKjt6jAe...
Do you know whether it's the name of the cat shown or of a particle physics experiment? Quiz made by William Barter, using cat photos provided by colleagues in the University of Edinburgh PPE group.
Could be — glueballs are the primary example. But not in this case. If there is a new boson whose mass is twice the mass of a top quarks and the quantum numbers of a top pair, then, according to Quantum Mechanics, they would mix.
Actually, Barry had a nice paper doing that for the QED case. Maybe one can generalize it to trabe and QCD. Do you want to talk about it?
I was sure someone actually looked into that… but maybe not. But it’s not just the coupling - at threshold the Higgs exchange generates a point interaction - so one gets additional 1/m_H^2 suppression. One can resum those, just like for the deuteron (delta-function potential).
I thought about the Higgs exchange… but it should not be stronger than the usual QCD Sommerfeld enhancement. IMHO, the 1/v effect for non-relativistic top quarks should produce the feature that they see… what do you think?
Why do you call the threshold feature a bound state?
Europe is wooing American researchers with funding as the Trump administration cancels grants 🧪
Is this one of the meteors from the Bootid Meteor Shower? What do you think? 🧪
A fiery object in the sky was seen by many in the South Carolina Midlands on Thursday afternoon. And it appears the object was seen across the Southeast
Yes, this is unfortunate. If the current trend continues, the European scientists would have no will to travel to the US, while US scientists would have no means/grants to travel to Europe…
