Charm quark

Encyclopedia : C : CH : CHA : Charm quark

---

Flavour in particle physics

Flavour quantum numbers Lepton number: L Baryon number: B Electric charge: Q Weak hypercharge: YW Weak isospin: Tz Isospin: I, Iz Hypercharge: Y Strangeness: S Charm: C Bottomness: B' Topness: T Y=B+S+C+B'+T Q=Iz+Y/2 Q=Tz+YW/2 B−L Related topics: CPT symmetry CKM matrix CP symmetry Chirality

The charm quark is a second-generation quark with a charge of +(2/3)e. It is the third most massive of the quarks, at 1.3 GeV (a bit more than the mass of the proton). It was predicted in 1970 by Sheldon Glashow, John Iliopoulos, and Luciano Maiani, and first observed in 1974, with the simultaneous discovery of the J/ψ charm particle at SLAC by a group led by Burton Richter and at BNL by a group led by Samuel C. C. Ting. The particle was named J by the BNL group and ψ by the SLAC group; when the naming controversy could not be resolved, the compromise J/ψ was adopted.

Hadrons containing charm quarks

Some of the hadrons containing charm quarks include:

• D mesons contain a charm quark (or its antiparticle) and an up or down quark.
• D_s mesons contain a charm quark and a strange quark.
• There are many charmonium states, for example the J/ψ. These consist of a charm quark and its antiparticle.
• Charmed baryons have been observed, and are named in analogy with strange baryons (e.g. Λ_c⁺).

Particles in physics - elementary particles	[http://encycl.opentopia.com/ edit ]
Fermions: Quarks: (Up · Down · Strange · Charm · Bottom · Top) | Leptons: (Electron · Muon · Tau · Neutrinos)
Gauge bosons: Photon | W and Z bosons | Gluons
Not yet observed: Higgs boson | Graviton | Other hypothetical particles

 

---

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.

Search Titles

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

?