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The charm quark, charmed quark, or c quark is an elementary particle found in composite subatomic particles called hadrons such as the J/psi meson and the charmed baryons created in particle accelerator collisions. Several bosons, including the W and Z bosons and the Higgs boson, can decay into charm quarks. All charm quarks carry charm, a ...
Quarks have fractional electric charge values – either (− 1 / 3 ) or (+ 2 / 3 ) times the elementary charge (e), depending on flavor. Up, charm, and top quarks (collectively referred to as up-type quarks) have a charge of + 2 / 3 e; down, strange, and bottom quarks (down-type quarks) have a charge of − 1 / 3 e.
c, the two light quarks combine to give a spin 1 diquark, which then combines with the charm quark to give either a spin 1/2 particle, or a spin 3/2 particle (normally known as a Σ ∗ c). It is the rules of quantum mechanics that make it possible for a Λ c to exist only with three different quarks (that is cud quarks), whereas the Σ
The positively charged quarks (up, charm, and top quarks) are called up-type quarks and have T 3 = + + 1 / 2 ; the negatively charged quarks (down, strange, and bottom quarks) are called down-type quarks and have T 3 = − + 1 / 2 . Each doublet of up and down type quarks constitutes one generation of quarks.
(J/psi) meson / ˈ dʒ eɪ ˈ s aɪ ˈ m iː z ɒ n / is a subatomic particle, a flavor-neutral meson consisting of a charm quark and a charm antiquark. Mesons formed by a bound state of a charm quark and a charm anti-quark are generally known as "charmonium" or psions. [1] The J/ψ is the most common form of charmonium, due to its spin of 1 ...
All quarks are assigned a baryon number of 1 / 3 . Up, charm and top quarks have an electric charge of + 2 / 3 , while the down, strange, and bottom quarks have an electric charge of − 1 / 3 . Antiquarks have the opposite quantum numbers. Quarks are spin- 1 / 2 particles, and thus fermions. Each quark or antiquark ...
Such transitions involve a change of the internal charm quantum number, and can take place only via the weak interaction. In D mesons, the charm quark preferentially changes into a strange quark via an exchange of a W particle, therefore the D meson preferentially decays into kaons (K) and pions (π). [1]
The double-charm tetraquark (T + cc, cc u d) is a type of long-lived tetraquark that was discovered in 2021 in the LHCb experiment conducted at the Large Hadron Collider. [3] [4] [2] [5] It contains four quarks: two charm quarks, an anti-up and an anti-down quark. [1] It has a theoretical computed mass of 3868 ± 124 MeV/c 2. [1]