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- W2056572043 abstract "This article proposes a solution to the long-standing $ensuremath{rho}ensuremath{-}ensuremath{pi}$ puzzle: How can the $ensuremath{rho}$ and $ensuremath{pi}$ be members of a quark model U(6) 36 and the $ensuremath{pi}$ be a Nambu-Goldstone boson satisfying partial conservation of the axial-vector current (PCAC)? Our solution to the puzzle requires a revision of conventional concepts regarding the vector mesons $ensuremath{rho}$, $ensuremath{omega}$, ${K}^{*}$, and $ensuremath{varphi}$. Just as the $ensuremath{pi}$ is a Goldstone state, a collective excitation of the Nambu-Jona-Lasinio type, transforming as a member of the (3,ifmmodebarelsetextasciimacronfi{}3) + (ifmmodebarelsetextasciimacronfi{}3,3) representation of the chiral SU(3) ifmmodetimeselsetexttimesfi{} SU(3) group, so also the $ensuremath{rho}$ transforms like (3,ifmmodebarelsetextasciimacronfi{}3) + (ifmmodebarelsetextasciimacronfi{}3,3) and is also a collective state, a dormant Goldstone boson that is a true Goldstone boson in the static chiral U(6) ifmmodetimeselsetexttimesfi{} U(6) limit. The static chiral U(6) ifmmodetimeselsetexttimesfi{} U(6) is to be spontaneously broken to static U(6) in the vacuum. Relativisitc effects provide for U(6) breaking and a massive $ensuremath{rho}$. This viewpoint has many consequences. Vector-meson dominance is a consequence of spontaneously broken chiral symmetry---the mechanism that couples the axial-vector current to the $ensuremath{pi}$ couples the vector current to the $ensuremath{rho}$. The transition rate is calculated as $ensuremath{gamma}_{ensuremath{rho}}^{}{}_{}{}^{ensuremath{-}1}=frac{{f}_{ensuremath{pi}}}{{m}_{ensuremath{rho}}}$ in rough agreement with experiment. This picture requires soft $ensuremath{rho}'mathrm{s}$ to decouple; but this requirement is not in conflict with any experimental features of the vector mesons. The chiral partner of the $ensuremath{rho}$ is not the ${A}_{1}$ but the $B(1235)$. The experimental absence of the ${A}_{1}$ is no longer a theoretical embarrassment in this scheme. As the analog of PCAC for the pion we establish a tensor-field identity for the $ensuremath{rho}$ meson in which the $ensuremath{rho}$ is interpreted as a dormant Goldstone state. The decays $ensuremath{delta}ensuremath{rightarrow}ensuremath{eta}+ensuremath{pi}$ $Bensuremath{rightarrow}ensuremath{omega}+ensuremath{pi}$, $ensuremath{epsilon}ensuremath{rightarrow}2ensuremath{pi}$ are estimated and are found to be in agreement with the observed rates. A static U(6) ifmmodetimeselsetexttimesfi{} U(6) generalization of the $ensuremath{Sigma}$ model is presented with the $ensuremath{pi}$, $ensuremath{rho}$, $ensuremath{sigma}$, $B$ in the (6,ifmmodebarelsetextasciimacronfi{}6) + (ifmmodebarelsetextasciimacronfi{}6,6) representation. The $ensuremath{rho}$ emerges as a dormant Goldstone boson in this model. Symmetry breaking in the model leads to the remarkable relation $m_{ensuremath{rho}}^{}{}_{}{}^{2}ensuremath{-}m_{ensuremath{pi}}^{}{}_{}{}^{2}=m_{B}^{}{}_{}{}^{2}ensuremath{-}m_{ensuremath{delta}}^{}{}_{}{}^{2}$, satisfied within 0.5%. Others' efforts towards an integration of PCAC with the quark model, particularly in the context of the Melosh transformation, are discussed." @default.
- W2056572043 created "2016-06-24" @default.
- W2056572043 creator A5061365978 @default.
- W2056572043 creator A5073657818 @default.
- W2056572043 date "1976-08-01" @default.
- W2056572043 modified "2023-10-18" @default.
- W2056572043 title "A solution to theρ−πpuzzle: Spontaneously broken symmetries of the quark model" @default.
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- W2056572043 doi "https://doi.org/10.1103/physrevd.14.809" @default.
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