/ Experiment-Nucl arXiv:0904.3417

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

Budzanowski, A. (Cracow, INP) ; Chatterjee, A. (Bhabha Atomic Res. Ctr.) ; Hawranek, P. (Jagiellonian U.) ; Jahn, R. (Bonn U., HISKP) ; Jha, V. (Bhabha Atomic Res. Ctr.) ; Kilian, K. (JCHP, Julich) ; Kirillov, Da. (JCHP, Julich) ; Kirillov, Di. (Dubna, JINR) ; Kliczewski, S. (Cracow, INP) ; Kolev, D. (Sofiya U.) ; Kravcikova, M. (Kosice Tech. U.) ; Lesiak, M. (JCHP, Julich) ; Lieb, J. (George Mason U.) ; Machner, H. (JCHP, Julich) ; Magiera, A. (Jagiellonian U.) ; Maier, R. (JCHP, Julich) ; Martinska, G. (Kosice U.) ; Nedev, S. (Chem. Tech. Metal. U., Sofia) ; Niskanen, J.A. (Helsinki U.) ; Piskunov, N. (Dubna, JINR) ; Protic, D. (JCHP, Julich) ; Ritman, J. (JCHP, Julich) ; von Rossen, P. (JCHP, Julich) ; Roy, B.J. (Bhabha Atomic Res. Ctr.) ; Sitnik, I. (Dubna, JINR) ; Siudak, R. (Cracow, INP) ; Stein, H.J. (JCHP, Julich) ; Tsenov, R. (Sofiya U.) ; Urban, J. (Kosice U.) ; Vankova, G. (JCHP, Julich) ; Wilkin, C. (University Coll. London)

Published in: Phys.Rev.
Year: 2009
Vol.: C79
Page No: 061001
Pages: 10

Abstract: Inclusive measurements of pion production in proton--proton collisions in the forward direction were undertaken at 400 and 600 MeV at COSY using the Big Karl spectrograph. The high resolution in the $\pi^+$ momentum ensured that there was an unambiguous separation of the $pp\to {\pi}^+d/\pi^+pn$ 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 $pp\to\pi^+d/\pi^+pn$ calculation that includes $S \rightleftharpoons D$ channel coupling between the final nucleons. A semi-quantitative understanding of the observed effects is achieved.

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/8250570; http://inspirebeta.net/record/818511/files/compare_Jouni_FW_with_d_diff.png; http://inspirebeta.net/record/818511/files/compare_data_FW_lin.png; http://inspirebeta.net/record/818511/files/compare_data_Jouni_lin.png

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