Scientists from various institutions have recently discovered that there might be a break in the application of the Standard Model, particularly with a fundamental principle called the lepton ...

One of the early proposals for the Tevatron asymmetry on $t \bar t$ was a "fundamental diquark" with a charge (and hypercharge) +4/3, either in a triplet or a sextet colour. I am interested on the ...

In this paper (relevant pdf section) that I'm reading, involving the calculation of bremsstrahlung in electron proton scattering (diagram below), the author calculates the integral over outgoing ...

Is there any good recent experimental data that tests whether the $\rho$ coupling constant depends only on the isospin multiplet of the produced particle?EDIT: I got a downvote, so I should explain ...

I realise that the initial answer to my question that may come to mind is, "we don't know yet, obviously" But my question is hopefully not opinion based.For example, does this upgrade have a ...

This questions might have been asked several times, but I haven't seen a mathematical point of view, so here it is.Based on Wigner classfication: A particle is a representation, because any theory ...

This might seem like a really strange question, but here's my reasoning.A proton-proton fusion reaction proceeds in two steps:\begin{align*}p + p + \text{1.25 MeV} &\rightarrow {}^2_2\mathrm{He}...

I will say right away that I don't mean standard-model sphalerons, I mean the sphalerons of some extension of the standard model. The reason to even think about this is last year's paper by Frampton ...

Is there a reason to believe that the axial resonances are heavier than the vector resonances in the composite Higgs models? For instance, in this article, to have zero tree level contributions to S ...

I have two differential cross sections $d\sigma_{1,2}/dM$ ($M$ is some invariant mass) corresponding to different hypothesis. What I want is to calculate how well the appropriate experiment would do ...

I am trying to reproduce the results found in R. Jackiw, S. Weinberg, Phys. Rev. D 5 (1972). The following loop integral is the only one that is giving the wrong result:$$\require{cancel}\...

When you produce a long-lived particle (like charged pions, muons), it enters your detector. When you produce a short-lived particle (like the higgs, tau), the production of the particle is only seen ...

The OZI rule states that a QCD diagram is suppressed if it can be cut into two by only cutting gluon lines (the precise wording is addressed in the question What is the precise statement of the OZI ...

In his freely available lectures on Gauge Theories and String Theory, David Tong makes multiple references to a course called Advanced Quantum Field Theory (in particular, the Faddeev-Popov trick ...

I'm new to particle physics, and I'm reading chapter 5 of Prof. Mark A. Thompson's "Modern Particle Physics", which talks about Time-ordered perturbation theory vs QED. However, in page 119 he wrote: ...