Baryon Definition and 86 Threads

I'm doing a little research on quarks on stumbled upon the baryon number. Wikipedia says that the notion predates the quark model. I have no clue why particle physicists were motivated to introduce it before flavour quantum numbers came to the scene. So... What's the (historical) origin of...

I read recently, that by separating two quarks, once a high enough energy has been introduced, new quark pairs will form. This sounds to me like a meson, being turned into two mesons. I don't know how clear I am on this, but I was wondering... Is the same true for Baryons. If we magically...

Hi Folks -- can anyone direct me to a table online which lists the wavefunctions for the hadrons in terms of their constituent quarks? (I'd like to look at how the wavefunctions can differ even for particles with the same quark content.) Thanks a lot!

If a baryon wavefunction is \Psi = \psi_{spatial} \psi_{colour} \psi_{flavour} \psi_{spin}, and we consider the ground state (L=0) only. We know that the whole thing has to be antisymmetric under the interchange of two quarks. We know that colour is antisymmetric (always colourless) and...

Mesons are bosons, while the baryons are fermions. My question is, meson is a type of hadron that made from the interaction of quark with gluon. Quark is fermion, not boson. so why mesons are boson?

It is generally stated that observed baryon to photon density (about 6.1x10^(-10)) is too small. What is the reason? What ratio is expected?

Homework Statement Are the following reactions possible? If yes, explain why and how the reaction occurs. If no, explain why. ... \Delta^+ \to p^+ + \pi^0"Homework Equations NA The Attempt at a Solution First of all, it wouldn't break any conservation law, hence it is possible (or is this...

I'm not really sure if this is the best place to ask this, but I'm doing a master's on a new hadron nomenclature. As part of it, I'm currently writing an article on baryon names, which I'm probably going to submit it to Physical Review D after my supervisors give the thumbs up. (I'm not really...

New "Beauty Baryon" discovered “A never-before-seen subatomic particle has popped into existence inside the world's largest atom smasher, bringing physicists a step closer to unraveling the mystery of how matter is put together in the universe.” “After crashing particles together about 530...

can there be a particle with baryon number +1 and electric charge -2 ?

Hi everyone, I have a perhaps slightly vague question for all the QCD experts out there. The simplest description of hadron quantum numbers comes from the parton picture where I attempt to simply add up the quantum numbers of a few partons that are supposed to make up the hadron. However, in...

Homework Statement Hi... I got a problem where I'm asked to figure out if several decays is forbidden or not. One says: p \rightarrow e^{+} + \gamma I'm then thinking baryon number conservation, but I'm not quite sure if it is right. The proton, p, is a baryon made up of 3 quarks...

I'm in trouble on answer to this question: "Wich is the (most probable) symmetry of the spatial part of the wavefunction for the lightest baryons? Why?" I know that the spatial and spin parts of a baryon wavefunction must be simmetric under an interchange of any two quarks (this is an...

This is the proposed scenario: We have an individual proton held in place by a contrived magnetic field which remains constant. Now, we fire photons and that spot where the proton is forced by the field and measure where the photon ends up to see if it collided with the proton. (Assuming we...

Something I've always wondered: You throw matter into a black hole, but get half matter and half antimatter out due to Hawking radiation. Or, you throw only protons in, but get positrons out. What happened to conversation of Baryon Number? It seems like you could convert matter to...

I am confused as to how the mass equivalence of the the 3 gluons in at nucleon can give rise to an increase in the baryon's rest mass. I can see how the mass equivalence of the energy contained in the gluons interaction can be added to the the amount of gravitational field generated by the...

What exactly are Baryon acoustic oscillations? How do we detect them? How are they used to build a "ruler" of cosmological parameters? How are BAOs related to the late time ISW effect? and to dark energy? Lots of questions, hopefully someone here can give me some answers or at least some...

I believe people when they read the title of this thread will not understand the nuances of the problem. The fact that 99% of the baryons are missing from satellite dwarf galaxies while most of the baryons are found in clusters may seem insignificant. When you read about this anomaly I would...

Can anyone explain to me why you can't have uuu and ddd on the first (spinhalf.gif) diagrams I have uploaded please?

"Electroweak stars: how nature may capitalize on the standard model's ultimate fuel," De-Chang Dai, Arthur Lue, Glenn Starkman, Dejan Stojkovic, http://arxiv.org/abs/0912.0520 Pretty far out, and I'm not sure I believe it. One thing that surprises me is that they claim the standard model has...

Homework Statement Part A) Establish which of the following combinations of particles can exist in a state of I=1 : a) \pi^0\pi^0 b) \pi^+\pi^- c) \pi^+\pi^+ d) \Sigma^0\pi^0 e) \Lambda^0\pi^0 Part B) of the problem is: In what states of isospin may exist the following systems? f)...

Hi, I have been looking at the baryon decuplet for spin 3/2 baryons, and the octet for spin 1/2 baryons. Here is a picture of the baryon decuplet: http://schools-wikipedia.org/images/392/39222.png Here is a picture of the baryon octet: http://upload.wikimedia.org/wikipedi...-small.svg.png...

I would like to ask what is mean by conservation of lepton and baryon? Does this imply conservation of mass? In addition, does this theory contradicts mass-energy conversion E=mc2?

There doesn't seem to be anything in the theory of the standard model that says such a baryon couldn't exist, so why don't we see it?

Anyone knows at what time after big bang, baryon asymmetry happened..i read in Simon singh's book "Big Bang" that there was more mater than antimatter when the temperature of universe was 10^15...anyone knows about the time at which it happened?

Hi I am just looking for the formula to calculate the baryon density of the universe at the recombination epoch. Is it a case of adding the average density of matter + radiation? but this does not take into account the recombination epoch (z=1200). I do not have a background in physics...

I am confused with baryon asymmetry and conservation of charge..we say that there is baryon asymmetry but the universe is neutral..how is that possible..if there is baryon asymmetry then there should be charge asymmetry also? I think i am missing some point..can someone explain these two in...

Hi there! As most people already might know, we can decompose the 27 dimensional representation for the baryons under SU(3) flavour symmetry as 27 = 10 + 8 + 8 + 1. I can find a lot of information about the particles that lie in the decuplet and in the octet, but nothing about which particle...

Its said that matter is more abundant than antimatter in observable universe and hence comes the baryon asymmetry...but why matter and antimatter should be equal in amount...which law governs this?

Hi I have just started an intro physics course - it has very little maths, explaining as much as possible in words. I am having trouble with understanding the relationship between colour charges and quarks and how they are formed to create hadrons. I understand that the colour charge...

Are there any GUT's that do not violate baryon number? It's my understanding SU(5), SUSY SU(5) and SO(10) have been falsified by current bounds on proton decay. Alternatively, given the current bounds of proton decay is 10^33 years 95% confidence and counting, if physicists a century from...

Hi all, long time lurker, first time poster. While this is technically a homework question, there is no math related to it and is more of an "understanding concepts" type question. What kinds of things would happen if the baryon number is not conserved in an interaction? I know it would make...

http://arxiv.org/abs/astro-ph/0605278 Searching for modified gravity with baryon oscillations: from SDSS to WFMOS Authors: Kazuhiro Yamamoto, Bruce A. Bassett, Robert C. Nichol, Yasushi Suto, Kazuhiro Yahata Comments: 16 pages, submitted to PRD We discuss how the baryon acoustic...

Black holes violate the conservation of baryon number. Is that true?

A baryon may have a charge of: a) -1/3 e b) 0 e c) 2/3 e d) 4/3 e I have no idea what a baryon is... and I've spent over 20 minutes online trying to answer this simple question.

From the American Institute of Physics update. Very interesting.