Measurement of the Differential Cross Section for the Reaction gamma n -> pi(-)p from Deuterium

CLAS Collaboration, W. Chen, T. Mibe, D. Dutta, H. Gao, J. M. Laget, M. Mirazita, P. Rossi, S. Stepanyan, I. I. Strakovsky, M. J. Amaryan, M. Anghinolfi, H. Bagdasaryan, M. Battaglieri, M. Bellis, B. L. Berman, A. S. Biselli, C. Bookwalter, D. Branford, W. J. BriscoeW. K. Brooks, V. D. Burkert, S. L. Careccia, D. S. Carman, L. Casey, P. L. Cole, P. Collins, V. Crede, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, S. Dhamija, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, H. Egiyan, P. Eugenio, G. Fedotov, A. Fradi, M. Garcon, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, W. Gohn, R. W. Gothe, K. A. Griffioen, M. Guidal, D. P. Watts

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We report a measurement of the differential cross section for the gamma n -> 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 (theta(c.m.)) between 50 degrees and 115 degrees. We confirm a previous indication of a broad enhancement around a c.m. energy (root s) of 2.1 GeV at theta(c.m.) = 90 degrees in the scaled differential cross section s7 d sigma/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 theta(c.m.) from 70 degrees to 105 degrees.

Original languageEnglish
Article number012301
Pages (from-to)-
Number of pages6
JournalPhysical Review Letters
Volume103
Issue number1
DOIs
Publication statusPublished - 3 Jul 2009

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