arXiv subjects

D. J. Tedeschi

Publications and source records attributed to D. J. Tedeschi.

3 recordsLinked to original sources

arXiv2010

Near-threshold Photoproduction of Phi Mesons from Deuterium

We report the first measurement of the differential cross section on $ϕ$-meson photoproduction from deuterium near the production threshold for a proton using the CLAS detector and a tagged-photon beam in Hall B at Jefferson Lab. The measurement was carried out by a triple coincidence detection of a proton, $K^+$ and $K^-$ near the theoretical production threshold of 1.57 GeV. The extracted differential cross sections $\frac{dσ}{dt}$ for the initial photon energy from 1.65-1.75 GeV are consistent with predictions based on a quasifree mechanism. This experiment establishes a baseline for a future experimental search for an exotic $ϕ$-N bound state from heavier nuclear targets utilizing subthreshold/near-threshold production of $ϕ$ mesons.

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arXiv2007

First measurement of coherent $ϕ$-meson photoproduction on deuteron at low energies

The cross section and decay angular distributions for the coherent ϕmeson photoproduction on the deuteron have been measured for the first time up to a squared four-momentum transfer t =(p_γ-p_ϕ)^2 =-2 GeV^2/c^2, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cross sections are compared with predictions from a re-scattering model. In a framework of vector meson dominance, the data are consistent with the total ϕ-N cross section σ_{ϕN} at about 10 mb. If vector meson dominance is violated, a larger σ_{ϕN} is possible by introducing larger t-slope for the ϕN \to ϕN process than that for the γN \to ϕN process. The decay angular distributions of the ϕare consistent with helicity conservation.

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arXiv1998

Dependence of pp->pp pi0 near Threshold on the Spin of the Colliding Nucleons

A polarized internal atomic hydrogen target and a stored, polarized beam are used to measure the spin-dependent total cross section Delta_sigma_T/sigma_tot, as well as the polar integrals of the spin correlation coefficient combination A_xx-A_yy, and the analyzing power A_y for pp-> pp pi0 at four bombarding energies between 325 and 400 MeV. This experiment is made possible by the use of a cooled beam in a storage ring. The polarization observables are used to study the contribution from individual partial waves.

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