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in creator/contributor: "Gasparian, A."

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Hybrid Calorimeter Algorithm Development for Primex Experiment

The PrimEx Collaboration seeks to measure the lifetime of the 0 meson (neutral pion) at high precision. The decay rate of the pion is considered to be the most fundamental prediction of low-energy quantum chromodynamics (QCD). Pions will be produced by the Primakoff Effect: a few GeV photon interacts with the coulomb field of a nucleus to produce a pion. The pion then decays almost immediately ({approx}10-16 seconds) into two photons. The decay photons will be detected by an electromagnetic hyb… more

Date: January 1, 2002

Creator: Motoyama, E.; Gasparian, A. & Bernstein, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Polarization Transfer in the He-4(polarized-e, e-prime polarized-p)H-3 Reaction up to Q{sup 2}=2.6 (GeV/c){sup 2}

We have measured the proton recoil polarization in the {sup 4}He(polarized-e, e-prime, p){sup 3}H reaction at Q{sup 2} = 0.5, 1.0, 1.6, and 2.6 (GeV/c){sup 2}. The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a predicted medium modification of the proton form factors based on a quark-meson coupling model. In contrast, the measured induced polarizations agree reasonably well with the fully relativistic calculation i… more

Date: November 1, 2002

Creator: Strauch, S.; Dieterich, S.; Aniol, K. A.; Annand, J. R. M.; Baker, O. K.; Bertozzi, W. et al.