FSI

FSI for heavy targets 05/14/06

The work in the entries below has been updated at
Jost function

FSI for heavy targets 05/07/06

A description of the quasifree electroproduction model is included at this link. The parameterization for the elementary cross section will be added after Henk Blok and Garth Huber have been contacted. In addition, pages 144-145 of Dave Gaskell's thesis may be helpful to describe our model.

A minor error was discovered in our our iteration procedure used before 05/07/06. The new results with this change are included below. The missing mass peaks have been partially corrected, however, there is still a shift between our model and the data that is most likely due to N-N FSI.

Model without Pauli blocking compared to the data:

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FSI for heavy targets 04/27/06 (rev. 05/03/06)

We would like to correct, as best we can, for the FSI between the struck and spectator nucleons (N-N FSI) in our ratios of heavy target yields (aluminum, copper and gold) with carbon. By using the ratios of the heavy targets, the effects due to FSI are expected to be reduced. However, we would like to attempt to correct the distributions (of missing mass, outgoing pion momentum, etc.) of the heavy targets for FSI.

The nuclear missing mass is defined as
M_x = sqrt( E**2 - P**2), where, E = nu + M_A - E_pi and P = q - P_pi
Missing mass distributions:

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Note: The Monte Carlo distributions have an arbitrary normalization to make the height match the data, and the Q2 in [GeV2] for the plots in the:
top row are (1.1 , 2.15),
middle row are (3.0 , 3.9), and,
bottom row are (4.7).

The shifts observed between the Monte Carlo and data distributions of the missing mass may be due to Pauli blocking and/or N-N FSI. Using a simple model for Pauli blocking, the distributions and yields were corrected for this effect (more details on this model). However, there is generally worse agreement between the Monte Carlo and data distributions when Pauli blocking is included.
Missing mass distributions with Pauli bocking:

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We attempted to model the effects of N-N FSI in deuterium through a Jost function approach (more details on this model).
Missing mass distributions for deuterium with Pauli blocking and N-N FSI:

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Besides the missing mass, comparisons between the data and the Monte Carlo using other distributions are at this link.

The central kinematics used in the experiment are contained in the links below.
Central kinematics (and latex source)