In particle physics, a kaon (/ˈkeɪ. ɒn/), also called a K meson and denoted. K. , is any of a group of four mesons distinguished by a quantum number called strangeness. In the quark model they are understood to be bound states of a strange quark (or antiquark) and an up or down antiquark (or quark).
Is a kaon a quark?
Kaons are a specific type of meson (mesons are particles made of one quark and one antiquark). What makes kaons unique is that they are made of one up quark or down quark, and one strange quark. (One of the two quarks that make of a kaon must be an antiquark, and the other must be normal matter.
What does a K+ decay into?
K+ decay to 3 charged pions A spectacular example of a K+ decaying to 3 pions – 2 positive and one negative. Each pion then stops and decays to a muon – a short track because the momentum of the muon is only 30 MeV/c. (This can be calculated from energy and momentum conservation – relativistic.)
What do kaons decay into a level physics?
The kaon is a particle that can decay into a pion. Strange particles are produced through the strong interaction and decay through the weak interaction. Strangeness occurs if a particle has a strange quark and is there to reflect the fact that strange particles are always created in pairs.
How are kaons formed?
The kaon (also called the K0 meson), discovered in 1947, is produced in high-energy collisions between nuclei and other particles. It has zero electric charge, and its mass is about one-half the mass of the proton. It is unstable and, once formed, rapidly decays…
What is a K particle?
(kā′ŏn′) n. Any of a group of four mesons, one positively charged and one negatively charged, having a mass 966 times that of an electron, and two electrically neutral, having a mass 974 times that of an electron.
Are all kaons strange?
Kaons are mesons formed by a strange (or anti-strange) quark and an up or down quark. They have strangeness of ± 1. Both charged kaons (K+, K-) and neutral kaons (K0, K 0) exist. These neutral kaons are distinguished by their strangeness: S(K0)=1, S(K0)=-1.
Why is kaon a strange particle?
In the late 40s and early 50s people noticed particles that left very unusual tracks in their emulsions. We now call these particles ‘kaons’ and ‘lambda hyperons,’ but at the time they were simple ‘strange particles. ‘ They decayed into charged particles, so the tracks they left had kinks in them or formed a ‘v.
Why do kaons have a longer lifetime?
The lifetime of kaons depends on their velocity in the gravity field. The fast kaons have more energy, more lifetime and therefore they can decay to 3 pions. If the fast kaons slow down they lose energy and therefore can decay only to 2 pions.
Is a kaon a baryon?
The two classes of hadrons: baryons (proton, neutron) and antibaryons (antiproton and antineutron) mesons (pion, kaon). Baryon number as a quantum number.
What is the anti particle of a kaon?
The antiparticle of the positive Kaon is the K- meson. Its quark structure is an anti up and a strange quark. When doing a question like this in an exam the most difficult part is determining the quark structure.
Are muons made of quarks?
Mu mesons, however, had shown themselves to be fundamental particles (leptons) like electrons, with no quark structure.
Do kaons experience the strong force?
Because muons don’t carry a color charge, and hence don’t participate in the strong interaction…
What interaction are kaons produced?
Kaons are produced through the strong interaction. This is shown by the gluon exchange particle. Kaons decay via the weak interaction.
Can a kaon decay into a muon?
In the following, two-body kaon decays to a muon and a SM neutrino are denoted K + → μ + ν μ , while those with a muon and a heavy neutrino are denoted K + → μ + ν h ; the notation K + → μ + N indicates either case.
What is the difference between pions and kaons?
Like the pion, the kaon can be positively charged, negatively charged or neutral. But being heavier than the pion, the kaon can decay to pions, although the most common mode of decay for charged kaons is to a muon. The studies of cosmic rays also revealed short-lived particles heavier than protons – the hyperons.
Do strange quarks exist?
Strange quarks (charge −1/3e) occur as components of K mesons and various other extremely short-lived subatomic particles that were first observed in cosmic rays but that play no part in ordinary matter.
What is a neutral kaon made of?
The strange quark is a heavy version of the down quark, and so both have an electric charge of −13. Neutral kaons are combinations of to quark-antiquark pairs: down-antiStrange and strange-antiDown. These two combinations are called K0 and ¯K0, respectively.
Are kaons fundamental?
It is clear from the quark model assignments that the kaons form two doublets of isospin; that is, they belong to the fundamental representation of SU(2) called the 2.
Is there an antiproton?
antiproton, subatomic particle of the same mass as a proton but having a negative electric charge and oppositely directed magnetic moment. It is the proton’s antiparticle.
Is lambda a baryon?
The lambda is a baryon which is made up of three quarks: an up, a down and a strange quark.
How are strange quarks created?
The abundance of strange quarks is formed in pair-production processes in collisions between constituents of the plasma, creating the chemical abundance equilibrium. The dominant mechanism of production involves gluons only present when matter has become a quark–gluon plasma.
Is a muon strange?
The strange behaviour of a fundamental particle called a muon may hint at the existence of exotic particles and forces beyond the standard model of physics. We have had signs of this anomaly before, but a new set of measurements has increased the likelihood that it is real.
What does a strange quark decay into?
Strange quark decay into two down quarks and an anti-down quark.
How are strange particles created?
Strange particles always: Are produced through the strong interaction. Decay through the weak interaction. Are produced in quark-antiquark pairs.