AI Article Synopsis
- The study measures the differential cross section for the gamman --> pi- p process using the CLAS detector at Jefferson Lab, focusing on photon energies from 1.0 to 3.5 GeV and pion center-of-mass angles between 50 and 115 degrees.
- The researchers confirm a significant enhancement at a center-of-mass energy of 2.1 GeV at an angle of 90 degrees and observe a rapid decrease in the cross section about 400 MeV after this enhancement.
- Data indicates that the observed enhancement has an angular dependence, with variations noted as the angle changes from 70 to 105 degrees in relation to the suggested scaling region.
Article Abstract
We report a measurement of the differential cross section for the gamman-->pi- p process from the CLAS detector at Jefferson Laboratory in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles (thetac.m.) between 50 degrees and 115 degrees. We confirm a previous indication of a broad enhancement around a c.m. energy ([sqrt]s) of 2.1 GeV at thetac.m.=90 degrees in the scaled differential cross section s7dsigma/dt and a rapid falloff in a center-of-mass energy region of about 400 MeV following the enhancement. Our data show an angular dependence of this enhancement as the suggested scaling region is approached for thetac.m. from 70 degrees to 105 degrees.
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| http://dx.doi.org/10.1103/PhysRevLett.103.012301 | DOI Listing |
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