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The antiquarks lie in the complex conjugate representation 3. In the near future, dedicated searches for q → q ′ a decays at ongoing experiments could potentially test Peccei-Quinn breaking scales up to 10 12 GeV at NA62 or KOTO and up to 10 9 GeV at Belle II or BES III. If we take three flavours of quarks, then the quarks lie in the fundamental representation, 3 (called the triplet) of flavour SU(3). For instance, a strong limit on the Λ → n a transition can be derived from the supernova SN 1987A. We also discuss in detail baryonic decays and three-body meson decays, which can lead to the best search strategies for some of the couplings. Axion contributions to neutral-meson mixing are calculated in a systematic way using chiral perturbation theory and operator product expansion. We think STRANGE is the possible answer on this. This answers first letter of which starts with S and can be found at the end of E. The crossword clue possible answer is available in 7 letters. in beta decay the W couples a u to a d quark in the decay D + K 0 + it couples a c to an s. In many weak decays, the changes are within a generation, e.g. There are three generations of quarks, based on pairs of weak positive/negative, weak isospin. Quarks with a charge of +(2/3) e are called up-type quarks, and those with a charge of -(1/3) e are called down-type. Thomson Michaelmas 2011 212 We can extend this idea to the quarks: Assume the strong interaction treats all quark flavours equally (it does) Because : The strong interaction possesses an approximate flavour symmetry i.e. For two-body decays, we use available experimental data to derive limits on q → q ′ a decay rates for all flavor transitions. This crossword clue Flavor of quark was discovered last seen in the Januat the Wall Street Journal Crossword. Quark Flavour and the Weak Interaction As we have already seen, the strong and electromagnetic interactions conserve quark flavour, whereas the weak interaction may change it. The flavor of the quark determines its properties. Flavour Symmetry of the Strong Interaction Prof. By absorbing or emitting a W boson, any up-type quark (up, charm, and top quarks) can change into any down-type quark (down, strange, and bottom quarks) and vice versa. We rigorously derive limits on the most general effective flavor-violating couplings from current measurements and assess their discovery potential. A quark of one flavor can transform into a quark of another flavor only through the weak interaction, one of the four fundamental interactions in particle physics. three generations of fermions with identical gauge interactions but different masses (flavours). Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing neutral currents, thus motivating QCD axion searches at precision flavor experiments. Quark Flavour Physics and Effective Field Theories.