Precision measurements of the pp -&gt;pi(+)pn and pp -&gt;pi(+)d reactions: Importance of long-range and tensor force effects

Budzanowski, A.; Chatterjee, A.; Hawranek, P.; et, al

doi:10.1103/PhysRevC.79.061001

Journal Article

Precision measurements of the pp ->pi(+)pn and pp ->pi(+)d reactions: Importance of long-range and tensor force effects

Budzanowski, A. ; Chatterjee, A. ; Hawranek, P. ; et, a.FZJ*

2009
Inst. Woodbury, NY

Physical review / C 79(6), 061001 (2009) [10.1103/PhysRevC.79.061001]

This record in other databases:

Please use a persistent id in citations: http://hdl.handle.net/2128/10371 doi:10.1103/PhysRevC.79.061001

Abstract: Inclusive measurements of pion production in proton-proton collisions in the forward direction were undertaken at 400 and 600 MeV at the cooler synchrotron (COSY) at Forschungszentrum Julich using the Big Karl spectrograph. The high resolution in the pi(+) momentum ensured that there was an unambiguous separation of the pp ->pi(+)d/pi(+)pn channels. Using these and earlier data, the ratio of the production cross sections could be followed through the Delta region and compared with the predictions of final state interaction theory. Deviations are strongly influenced by long-range terms in the production operator and the tensor force in the final pn system. These have been investigated in a realistic pp ->pi(+)d/pi(+)pn calculation that includes S reversible arrow D channel coupling between the final nucleons. A semiquantitative understanding of the observed effects is achieved.</p>.

Keyword(s): p p: inelastic scattering ; force: tensor ; pi+: hadroproduction ; Delta(1232) ; effect: long-range ; final-state interaction ; Juelich COSY PS ; coupled channel ; differential cross section: energy dependence ; p p --> n p pi+ ; p p --> deuteron pi+ ; deuterons (auto) ; neutron production (auto) ; pion production (auto) ; proton-proton interactions (auto)

Classification:

Note: We are grateful to W. R. Falk for making the data of Ref. [2] available to us. The quality of the beam necessary for the success of this work is due mainly to the efforts of the COSYoperator crew. We gratefully acknowledge support from the European Union under the FP6Structuring the European Research Area," Contract No. RII3-CT-2004-506078, from the Indo-German bilateral agreement (Internationales Buro des BMBF, IND 05/02), from the Research Center Julich (FFE), Academy of Finland (54038), DAAD 313-PPP-SF, and from GAS Slovakia (1/4010/07), and SCSR Poland.

Contributing Institute(s):