Radius of the ρ meson determined from its decay constantстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 6 апреля 2016 г.
Аннотация:We present a unified model describing electroweak properties of the π and ρ mesons. Using a general
method of the relativistic parametrization of matrix elements of local operators, adjusted for the
nondiagonal in the total angular momentum case, we calculate the ρ-meson lepton-decay constant fρ
using the same parameters of free constituent quarks that have ensured exclusively good results for the π
meson previously. The only free parameter, characterizing quark interactions, which include an additional
spin-spin contribution and hence differ from the π-meson case, is fixed by matching the decay constant to
its experimental value. The mean square charge radius is calculated, <r^2_ρ> =(0.56 pm 0.04) fm^2.. This result
confirms, for the ρ-meson case, the conjecture of equality between electromagnetic and strong radii of
hadrons. This conjecture was tested previously for proton, π and K mesons.