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A model of the basic particles and forces featuring six quarks, three charged leptons, three massless neutral leptons and four fundamental force carrying bosons. The twelve fermions are arranged into three generations, while the bosons serve to explain the electromagnetic interaction plus the strong and weak nuclear forces (and the Higgs mechanism). Do NOT use this tag for the standard model of cosmology, etc..

4 votes

Is the Standard Model experimentally verified?

Welcome to the site. I will answer assuming that you come from a non western culture ( your nickname is not readable) and English is not your first language, and that you are a student. For a model …
  • 226k
1 vote
Accepted

What if we heated the universe to a temperature above the Higgs phase transition?

The separation of the four fundamental forces in the early universe. You are asking whether one can reproduce the state of the universe before $10^{-12}$ seconds, when the weak and electromagne …
  • 226k
32 votes

Do standard model particles actually exist or merely usefully describe behaviors of a medium?

Here is a bubble chamber picture of an event It is interpreted as particles: $$ {\newcommand{Subreaction}[2]{{\rlap{\hspace{0.38em} \lower{25px}{{\rlap{\rule{1px}{20px}}} {\lower{0.5ex}{\hspace{- …
  • 226k
2 votes

How could an up quark turn into a down quark through practical means?

How could an up quark turn into a down quark through practical means? It cannot. Quantum mechanics is not deterministic, it depends on the probability of the decay, in this case, happening. Look at …
  • 226k
0 votes

Understanding the $\tau$ Branching Fractions from PDG

Of course they do not add up to unity when they are inclusive states, there will be overlaps where the same channels will fulfill the "larger or equal " criteria. The probability will sum up to one of …
  • 226k
3 votes
Accepted

Standard Model Particle Properties

Is it accurate to say that all of the particles defined by the SM ... The standard model is a quantum field theoretical model. The elementary particles of the standard model are axiomatic, they are …
  • 226k
2 votes

why does the higgs mechanism need to exist?

What I have retained from lectures on symmetry breaking is that when trying to write a unified Lagrangian for weak and electromagnetic interactions, one is faced with the fact that the electromagnetic …
  • 226k
4 votes
Accepted

How does a field know when to make how many particles?

You cannot just "dump energy" , you have to model with the interactions. Example. The proton proton collider distributes the energy of the scatter according to quantum mechanical formulas, to the c …
  • 226k
1 vote

What is the obstacle to writing down a String Theory that describes our universe?

Found this quote from a 2011 paper , String theory: a perspective over the last 25 years : Flux compactifications are the closest we have come to realising the Standard Model of particle physics …
  • 226k
0 votes
Accepted

What is the equation for a freely propogating glueball?

There exist no free gluons, it is called confinement: Since gluons themselves carry color charge, they participate in strong interactions. These gluon-gluon interactions constrain color fields to …
  • 226k
0 votes
Accepted

Is there one all encompassing higgs field? Or are many higgs fields separate and individuall...

This is the table of elementary particles in the standard model of particle physics: The model is called standard because it describes the grand majority of existing data and has been predictive of …
  • 226k
3 votes
Accepted

Why is it so important to measure CP violation in the lepton sector?

CP violation in the hadronic sector is not enough to explain the observed baryon asymmetry in our universe, and it is one of the main problems in cosmological models.Any proposal that introduces natur …
  • 226k
0 votes

Why each time Higgs boson decays differently?

Why the higgs boson and all other particles decays differently for example H->ZZ, H->WW, H->YY, H->bb. The Higg is an elementary particle in the elementary particle table of the standard model of …
  • 226k
3 votes

Does the Standard Model of Particle Physics actually state that particles don't exist?

Particles exist according to the plethora of experimental data gathered over the last hundred years, and tabulated with masses etc as seen in the Particle Data Group. The Standard Model, as its name s …
  • 226k
3 votes

At what energy do up and down quarks unbind?

The other side of the coin then ACuriousmind 's answer is the quark gluon plasma. The quark gluon plasma is a phase of quantum chromodynamics (QCD) which is hypothesized to exist at extremely hig …
  • 226k

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