Strength of the [rho] meson coupling to nucleons

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.1731· OSTI ID:7033101

Brown, G E ^[1]; Machleidt, R ^[2]

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1. Department of Physics, State University of New York, Stony Brook, New York 11794 (United States)
2. Department of Physics, University of Idaho, Moscow, Idaho 83843 (United States)

In his recent publication of a [ital NN] phase shift analysis below 160 MeV, Henneck reports relatively large values for the mixing parameter [epsilon][sub 1]. Based on these results, Henneck suggests that the strength of the [rho]-meson coupling to the nucleon may be weaker than used in present day [ital NN] interactions, like the Paris, Nijmegen, or Bonn potentials. We point out that at low enegies ([approx lt] 100 MeV) there is rather little sensitivity to the strength of the [rho] coupling, due to the compensating effect of the second-order tensor term. In order to establish sensitivity, one has to go to energies [approx gt]200 MeV, where the second-order contribution has gone out. As it happens, the [epsilon][sub 1] mixing parameter is well determined in the region of energies 200--300 MeV, and there is agreement with the predictions by the Paris and Bonn potentials; the weak-[rho] model is about 50% above the data. This and additional considerations in triplet [ital P] waves reconfirm that [ital NN] scattering requires the strong [rho], consistent with the [pi][pi]-[ital N[bar N]] partial-wave analysis by Hoehler and Pietarinen.

• DOE Contract Number: FG02-88ER40388
• OSTI ID: 7033101
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662340 -- Hadron Interactions-- (1992-)
663110 -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663300* -- Nuclear Reactions & Scattering
General-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON-BARYON INTERACTIONS
BOSONS
COUPLING
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PHASE SHIFT
RHO-770 MESONS
SCATTERING
SENSITIVITY
VECTOR MESONS