I was reading about the half life measurements and was curious to understand the experimental setups that allows so minute measurements to be captured. Specifically looking into half life of Higgs boson. I am looking to understand one example method of measuring Higgs boson half life. Please feel...

I apologize if this seems like a simple question, but I have been agonizing over it recently. In nonrelativistic quantum mechanics, a plane wave of the form $e^{\pm i\vec p\cdot \vec x}$ is called outgoing (incoming for the minus sign). However, in QFT (particularly in the context of the mode exp...

Consider the Dyson series of the S matrix of Quantum Electrodynamics. The second term in this series predicts non-zero probability amplitudes of observing photons that are off-shell. For an incoming state of a positron and an electron, the second term of the series gives a non-zero amplitude that...

The physical minimal coupling procedure is usually expressed mathematically in the language of fibre bundles where instead of local presentations we deal with global objects - gauge fields are connections on a principal bundle with structure group of symmetries, matter fields are sections of a bu...

When saying that in a small time interval $dt$, the velocity has changed by $d\vec v$, and so the acceleration $\vec a$ is $d\vec v/dt$, are we not assuming that $\vec a$ is constant in that small interval $dt$, otherwise considering a change in acceleration $d\vec a$, the expression should have ...

Modern cosmology is built on the Friedmann equations, which in turn relies on isotropy - the idea that the universe looks the same in every direction - as a fundamental assumption. However, there's a very noticeable dipole in the CMB, the standard interpretation of which is that we are moving w.r...