It is composed of two up quarks (u) and one down quark (d).
It is composed of 2 up quarks (u) and 1 down quark (d).
This reversal is called a flavor change, because the quark goes from being a down quark to being an up quark.
The new particle, a class of “tetraquark,” is made of a bottom quark, a strange quark, an up quark and a down quark.
One down quark and two up quarks would make up a proton.
The proton is composed of two u quarks and a d quark.
example, consists of two u quarks and one d quark.
Artist's impression of a proton with two u quarks (blue and red) and a d quark (green).
The only difference between them is a single u or d quark, and these are very nearly the same in mass.
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First evidence for the existence of the up (u) quark and the down (d) quark, representing the 1st generation of quarks.
It also changes the flavors of quarks, transforming a quark d u quark in a neutron decay into a proton.
Two d and a u quark are bound to each other in a neutron.
The fundamental family, consisting of an up-quark, a down-quark, an electron and a neutrino (the two leptons) is sufficient to explain our visible world.
Frame 2: One of the down quarks is transformed into an up quark.
This implies that the down quark is slightly more massive than the up quark.
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For instance, it can transform an up quark into a down quark.
This means that one ‘up’ quark has changed into a ‘down’ quark.
The top quark mass is much bigger than bottom quark mass.
Frame 2: One of the the down quarks is transformed into an up quark.
Notably the analysis indicates that the Down quark is larger than the Up quark.
The down quark is a few MeV more massive than the up quark.
This implies that the down quark is slightly more massive than the up quark.
Frame 2: One of the down quarks is transformed into an up quark.
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