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Titolo:
Chiral 3 pi-exchange NN potentials: Results for dominant next-to-leading-order contributions - art. no. 044010
Autore:
Kaiser, N;
Indirizzi:
Tech Univ Munich, Dept Phys T39, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 T39, D-85747 Garching, Germany
Titolo Testata:
PHYSICAL REVIEW C
fascicolo: 4, volume: 6304, anno: 2001,
pagine: 4010 -
SICI:
0556-2813(200104)6304:4<4010:C3PNPR>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PION-NUCLEON SCATTERING; FORM-FACTORS; LAGRANGIANS; EXCHANGE; FORCES; 2-PION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Kaiser, N Tech Univ Munich, Dept Phys T39, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 47 Garching, Germany
Citazione:
N. Kaiser, "Chiral 3 pi-exchange NN potentials: Results for dominant next-to-leading-order contributions - art. no. 044010", PHYS REV C, 6304(4), 2001, pp. 4010

Abstract

We calculate in (two-loop) chiral perturbation theory the local NN potentials generated by the three-pion exchange diagrams with one insertion from the second order chiral effective pion-nucleon Lagrangian proportional to the low-energy constants c(1,2,3,.4) The resulting isoscalar central potential vanishes identically. In most cases these 3 pi -exchange potentials are larger than the ones generated by the diagrams involving only leading order vertices due to the large values of c(3,4), (which mainly represent virtualDelta excitation). A similar feature has been observed for the chiral 2 piexchange. We also give suitable (double-integral) representations for the spin-spin and tensor potentials generated by the leading-order diagrams proportional to g(A)(6) involving four nucleon propagators. In these cases theCutkosky rule cannot be used to calculate the spectral functions in the infinite nucleon mass limit since the corresponding mass spectra start with anonvanishing value at the 3 pi threshold. Altogether, one finds that chiral 3 pi exchange leads to small corrections in the region r greater than or equal to1.4 fm where 1 pi and chiral 2 pi exchange alone provide a very good strong NN force as shown in a recent analysis of the low-energy pp-scattering database.

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Documento generato il 29/03/20 alle ore 13:51:02