charge-parity symmetry hamâmuni-ye bâr-hamâli Fr.: symétrie charge-parité The laws of physics should be the same if a particle is interchanged with its → antiparticle (→ charge conjugation), or swapped for its mirror image (→ parity symmetry). It is known that charge-parity (CP) symmetry holds for interactions involving → electromagnetism, → gravitation, and → strong interactions, but CP violation is known to occur during → weak interactions involved in → radio decay. Same as → CP-symmetry. |
even parity hamâli-ye zowj Fr.: parité paire A classical variable which does not change upon spatial inversion, such as time, energy, angular momentum and so on. → odd parity. Even, from O.E. efen "level; equal," from P.Gmc. *ebnaz (cf. Ger. eben; Goth. ibns); → parity. Hamâli, → parity; zowj "pair, couple; an even number," from Ar. |
parity hamâli (#) Fr.: parité 1) General: Equality, as in amount, status, or character;
equivalence; correspondence; similarity; analogy. Opposite of disparity. From M.Fr. parité, from L.L. paritas "equality," from L. adj. par "equal." Hamâli, quality noun of hamâl, → pair (equivalent 2). |
parity conservation pâyeš-e hamâli, pâyandegi-ye ~ Fr.: conservation de parité In quantum mechanics, the condition of parity in strong and electrodynamic interactions, where it remains constant and does not change with time. In other words, parity conservation implies that Nature is symmetrical and makes no distinction between right- and left-handed rotations or between opposite sides of a subatomic particle. Thus, for example, two similar radioactive particles spinning in opposite directions about a vertical axis should emit their decay products with the same intensity upward and downward. Same as → parity symmetry. → parity; → conservation. |
parity symmetry hamâmuni-ye hamâli Fr.: symétrie de parité The invariance of physical laws under a transformation that changes the sign of the space coordinates. Parity symmetry is sometimes called mirror symmetry. It is known that the parity symmetry is violated in some weak interactions, while it is well preserved in all other three interactions (gravitational, electromagnetic, strong). Same as → P-symmetry and → parity conservation. |
parity violation enâheš-e hamâli Fr.: violation de la parité In quantum mechanics, the condition of → parity in the → weak interaction. For example, the emitted → beta particles in → radioactive decay of → cobalt-60 nuclei are not equally distributed between the two poles of cobalt-60. More beta particles emerge from one pole than the other, and it would be possible to distinguish the mirror image nuclei from their counterparts. |