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- W2003146450 abstract "One of the fundamental predictions of QCD is the phenomenon of Color Transparency (CT), which was first described more than two decades ago [2, 3]. CT describes the process by which a color singlet object with a reduced transverse size has a vanishingly small interaction cross section when propagating through a nucleus. Such a Point Like Configuration (PCL) can be created in a scattering experiment at high momentum transfer (Q). See one of the many review articles for details [4, 5, 6]. Experimentally the onset of CT can be observed as a rise in the nuclear transparency, TA = σA AσN with increasing Q. Many experiments have looked for a signal of CT but only a few have observed one. For an overview of the experimental status see [7]. The reaction used in this experiment is incoherent electro-production of ρ mesons off nuclei, which offers many advantages. It is expected that the onset of CT occurs at a lower Q for a meson (qq) compared to a hadron (qqq)[8]. Also, since the ρ is a vector meson, the production mechanism is well understood by the Vector Meson Dominance model (VMD) as the fluctuation of a photon (which has the same quantum numbers as a vector meson) into a (qq) pair. The photon at high virtuality Q is expected to produce a pair with small ∼ 1/Q transverse separation. CT then manifests itself as a vanishing absorption of this (qq) pair as it propagates through the nucleus [9, 10]. The dynamical evolution of the small size (qq) pair to a normal sized vector meson is controlled by the time scale called the formation time. In the rest frame of the nucleus this is given by tf = 2ν m′2 V −mV , where V ′ represents the first excited state of the meson and V represents the ground state. This formation time needs to be sufficiently long to be able to observe CT." @default.
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- W2003146450 date "2007-01-01" @default.
- W2003146450 modified "2023-09-25" @default.
- W2003146450 title "Investigating the Onset of Color Transparency with CLAS" @default.
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- W2003146450 doi "https://doi.org/10.3360/dis.2007.203" @default.
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