Detailed comparison of the pp ---> pi+pn and pp ---> pi+d reactions at 951-MeV - INSPIRE

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Detailed comparison of the pp ---> pi+pn and pp ---> pi+d reactions at 951-MeV

GEM

Collaboration

•

M. Abdel-Bary

Dec, 2004

8 pages

Published in:

Phys.Lett.B 610 (2005) 31-36

e-Print:

nucl-ex/0412002 [nucl-ex]

DOI:

10.1016/j.physletb.2005.01.100

View in:

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Abstract:

The positively charged pions produced in proton-proton collisions at a beam momentum of 1640 MeV/c were measured in the forward direction with a high resolution magnetic spectrograph. The missing mass distribution shows the bound state (deuteron) clearly separated from the

pn

continuum. Despite the very good resolution, there is no evidence for any significant production of the

pn

system in the spin-singlet state. However, the

\sigma(pp\to \pi^+pn)/\sigma(pp\to \pi^+d)

cross section ratio is about twice as large as that predicted from

S

-wave final-state-interaction theory and it is suggested that this is due to

D

-state effects in the

pn

system.

Note:

8 pages, 3 figures

13.75.Cs
25.40.Qa
Pion production
Spin singlet/triplet final state interactions
p p: exclusive reaction
pi+: hadroproduction
production: small-angle
deuteron: hadroproduction
mass spectrum: missing-mass
channel cross section: ratio

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