Phenomenology Definition and 23 Threads

The experimentally measured properties of protons and neutrons are known with exquisite detail. Our data is not quite as extremely precise, but still very good more other baryons and mesons with light quarks (u, d, and s) as valence quarks, such as pions and kaons. Yet, on a percentage basis...

Hi everyone! I am studying Higgs phenomenology, in particular its BRs My line of reasoning is this: I first had a look at the decays where the Higgs particle couples directly (i.e. without intermediate particles) to the products; those are ##H^0 \to b \bar b, \ H^0 \to \tau \bar \tau##...

The term which is relevant for the calculus is: $$ \bar u(p) \gamma^\alpha \frac{1}{\displaystyle{\not}p+\not k} \gamma^\nu \frac{1}{\displaystyle{\not}p'-\not k} \gamma^\beta v(p') \frac{k_\alpha k_\beta}{k^2} $$ $$ \bar u(p) \displaystyle{\not}k \frac{1}{\displaystyle{\not}p+\not k}...

A couple of papers in the last couple of years identify problems with the ΛCDM "standard model of cosmology" based upon high redshift astronomy observations. Have there been adequate responses to these concerns? Charles L. Steinhardt, et al., "The Impossibly Early Galaxy Problem" (June 3...

I. Background The magnetic moment of the muon, g, is predicted by the Standard Model, to be equal to 2 and a bit more, with the quantity that we look at being g-2. We have both experimental measurements and theoretical predictions that are close to each other to many significant digits, but...

Let's assume, we have standard model singlet particle s that mixes after electroweak symmetry breaking with an exotic, vectorlike neutral lepton N The relevant part of the Lagrangian reads $$ L \supset h^c s N + h s N^c + M N N^c, $$ where h is the standard model higgs and M is a superheavy...

The parameterized post-Newtonian formalism is an approximation of general relativity that is easier to calculate with that applies in "weak" gravitational fields where objects are "slow" moving. My question is: "What is the approximate domain of applicability of the post-Newtonian formalism?"...

I am giving an informal talk in my research group and was wondering what are the hottest research papers in phenomenology as of now. Any help would be great.

I am doing a Masters in theoretical physics. It's been half a year since I've begun my Masters. Recently, I find myself intrigued by machine learning and would like to do a PhD in machine learning after I finish my Masters in theoretical physics. I am rather afraid to break it to my supervisor...

Hi I am an undergraduate student of physics in the university of Athens. I am reaching my final year of studying and we are asked to select and work with one of our professors so that we can make a (barchelors) thesis about a specific specialization. I have know for a long time that I want to...

LIGO will apparently announce on February 11, the detection at five plus sigma of gravity waves (3 solar masses of energy worth in about 100 seconds) emitted as two medium sized black holes of about 65 solar masses combined spiral into each other and merge into a single Kerr (i.e. spinning)...

Compared to the other fermions, I have always had much less interest in Koide mass formulas for neutrinos. There is less data, and neutrino mass works differently anyway (Dirac plus Majorana, whereas the other fermions are just Dirac). But today that has changed. First, today we have a paper...

Sabine Hossenfelder recently wrote a blog post containing this parenthetical remark: "(I had meant to write a summary of which possible experiments for quantum gravity pheno are presently being discussed and how plausible I think they are to deliver results, but I got distracted by Dyson’s above...

Hi, I'm looking for a good book on particle physics phenomenology/nuclear physics. I'm having books like that of Das&Ferbel and Povh&Rith from my undergraduates, but often there I think there is not enough emphasis on the theoretical basis underlying it all. So does someone have good...

In the current long thread discussing string theory, https://www.physicsforums.com/showthread.php?p=2982921": I replied So here is the promised thread. As I said, I think it's unlikely that this number from the 11-dimensional theory would show up so directly in 4 dimensions. But it would be...

For doing research in high energy physics phenomenology, specially in physics beyond standard model, what background should one have? What are the tools researchers in this area generally use? Do you think research in this area to be hard? In phenomenology papers, sometimes very complicated and...

http://arxiv.org/abs/0905.3170 In this paper we have recalled the semiclassical metric obtained from a classical analysis of the loop quantum black hole (LQBH). We show that the regular Reissner-Nordstrom-like metric is self-dual in the sense of T-duality: the form of the metric obtained in...

Theoretical physics, especially high energy physics, is often further divided into "theory" and "phenomenology". Since both refer to theoretical (not experimental) physics, what exactly the difference between them is? I would say that 1. Theory concerns general principles and methods of...

It's a good paper. She delivered it in June at the Irvine SUSY 06 conference but we didnt get to see it until now. It has a confusing passage on page 2, at the bottom, right before the Feynman diagram on page 3. ===quote=== In contrast to the asymptotic momenta p, the wave-vector k of the...

I just wonder if there are any known models that suggest higgs-like potential (Sigma a phi_a^2-constant)^2 in string phenomenology.

I am only just starting to realize that there is a correspondence between quantum field theory and Einsteins field equations. In QFT the approach is to write the Lagrangian and then to solve the Euler Lagrange equation to obtain the equations of motion of the field. In GR it seems that...

lately I have been looking at the cultural aspects of ghost/haunting phenomenology and it has struck me that these 'events' don't reside in a well defined category of plausibility at all- speaking with some Asian friends I've discovered that in Asia and the East- that ghosts/hauntings are NOT...

Dennett's own explanation of heterophenomenology. Tell me what you think.