Down Quark

Composition	Elementary particle
Family	Fermion
Group	Quark
Generation	First
Mass	4 - 8 MeV/c2
Electric charge	-1/3 e
Spin	½
This box: view • talk • edit

The down quark is a first-generation quark with a charge of -(1/3)e. In Particle physics, an elementary particle or fundamental particle is a particle not known to have substructure that is it is not known to be made In Particle physics, fermions are particles which obey Fermi-Dirac statistics; they are named after Enrico Fermi. In Physics, a quark (kwɔrk kwɑːk or kwɑːrk is a type of Subatomic particle. In Particle physics, a generation is a division of the Elementary particles Between generations particles differ only by their Mass. The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried In Quantum mechanics, spin is a fundamental property of atomic nuclei, Hadrons and Elementary particles For particles with non-zero spin In Physics, a quark (kwɔrk kwɑːk or kwɑːrk is a type of Subatomic particle. The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried It is the second-lightest of all quarks. Its bare mass is not well determined, but probably lies between 4 and 8 MeV. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object According to the Standard Model of particle physics, it and the up quark are the fundamental constituents of the nucleons; the proton contains one down quark and two up quarks, while the neutron contains two down quarks and one up quark. The Standard Model of Particle physics is a theory that describes three of the four known Fundamental interactions together with the Elementary particles Particle physics is a branch of Physics that studies the elementary constituents of Matter and Radiation, and the interactions between them The up quark is a particle described by the Standard Model theory of Physics. In Physics a nucleon is a collective name for two Baryons the Neutron and the Proton. The proton ( Greek πρῶτον / proton "first" is a Subatomic particle with an Electric charge of one positive This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. Note, however, that the majority of the mass in nucleons comes from the energy in the gluon field holding the quarks together, and not the quark masses themselves. Gluons ( Glue and the suffix -on) are Elementary particles that cause Quarks to interact and are indirectly responsible for the In Physics, a field is a Physical quantity associated to each point of Spacetime.

Down quarks were named when Gell-Mann and Zweig developed the quark model in 1964, and the first evidence for them was found in deep inelastic scattering experiments at SLAC in 1967. Murray Gell-Mann (born September 15, 1929) is an American Physicist who received the 1969 Nobel Prize in physics for his work George Zweig (born 1937 in Moscow Russia into a Jewish family was originally trained as a Particle physicist under Richard Feynman and later turned his attention In Physics, the quark model is a classification scheme for Hadrons in terms of their valence quarks, i Year 1964 ( MCMLXIV) was a Leap year starting on Wednesday (link will display full calendar of the 1964 Gregorian calendar. Deep inelastic scattering is the name given to a process used to probe the insides of Hadrons (particularly the Baryons, such as Protons and Neutrons The Stanford Linear Accelerator Center ( SLAC) is a United States Department of Energy National Laboratory operated by Stanford University under Year 1967 ( MCMLXVII) was a Common year starting on Sunday (link will display full calendar of the 1967 Gregorian calendar.

Hadrons containing down quarks

Some of the hadrons containing down quarks include:

• Charged Pions (π^±) are mesons containing an up quark and an anti-down quark, or vice versa. In Particle physics, a hadron ( from the ἁδρός hadrós, " stout, thick " ( In Physics, a charge may refer to one of many different quantities such as the Electric charge in Electromagnetism or the Color charge in In Particle physics, pion (short for pi meson) is the collective name for three Subatomic particles, and. In Particle physics, a meson is a strongly interacting Boson &mdashthat is a Hadron with integer spin. The up quark is a particle described by the Standard Model theory of Physics.
• The neutral pion (π⁰) is a linear combination of up-antiup and down-antidown, as are the ρ and ω mesons. Electric charge is a fundamental conserved property of some Subatomic particles which determines their Electromagnetic interaction. In Mathematics, linear combinations are a concept central to Linear algebra and related fields of mathematics
• The η and η′ flavorless mesons are linear combinations of several quark-antiquark pairs, including down-antidown. In Particle physics, flavour or flavor (see spelling differences) is a Quantum number of Elementary particles related to their In Mathematics, linear combinations are a concept central to Linear algebra and related fields of mathematics
• A large number of detected baryons contain one or more down quarks. Baryons are the family of Subatomic particles with a Baryon number of 1 Like the nucleons, the Δ baryons are made of only up and down quarks: the Δ⁺⁺ contains no down quark, but the Δ⁺ contains one, the Δ⁰ contains two, and the Δ⁻ contains three. In Physics a nucleon is a collective name for two Baryons the Neutron and the Proton.

See also

• Isospin

In Physics, and specifically Particle physics, isospin ( isotopic spin, isobaric spin) is a Quantum number related to the

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic