Manifestation of the pion pole in p → n charge-exchange scattering

Bradamante, F.; Martin, A.

doi:10.1016/0370-2693(94)01564-s

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…In Refs. [323,324] is was shown that g NN could be extracted with good precision from the data of a single experiment, in a model independent way by extrapolating the data to the pion pole. Like in the NN case, a "low" value for g 2 NN was obtained, which has been a matter of concern and discussion [325].…”

Section: Pp Charge-exchange Dierential Cross-sectionmentioning

confidence: 99%

Antinucleon–nucleon interaction at low energy: scattering and protonium

et al. 2002

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Pp Charge-exchange Dierential Cross-sectionmentioning

confidence: 99%

Antinucleon–nucleon interaction at low energy: scattering and protonium

et al. 2002

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“…In the above expression E cm is the center of mass energy. In fact, these new data give a very precise value for g 2 πN N /4π [1,4,5], a value which is smaller than the accepted value by about 5%. Recently the Nijmegen group, who analyzed both the N N data [6] and the N N data [7] within a OBEP model, also advocated a smaller value for g 2 πN N /4π.…”

Section: The Strength Of the Pion Nucleon Couplingmentioning

confidence: 62%

What have we learned from antiproton proton scattering?

Myhrer¹

1997

Nuclear Physics B - Proceedings Supplements

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From recent charge exchange measurements in the extreme forward direction, an independent and precise determination of the pion nucleon coupling constant is possible. This determination has reopened the debate on the value of this fundamental coupling constant of nuclear physics. Precise measurements of charge exchange observables at forward angles below 900 MeV/c would also give a better understanding of the long range part of the two-pion exchange potential. For example, the confirmation of the coherence of the tensor forces from the pion exchange and the isovector two-pion exchange would be very valuable. With the present data first attempts at an $\NbarN$ partial wave analysis have been made where, as in nucleon nucleon scattering, the antinucleon nucleon high J partial waves are mainly given by one-pion exchange. Finally a recent $\pbarp$ atomic cascade calculation and the fraction of P-state annihilation in gas targets is commented on.Comment: 10 pages, Latex, to be published in Nucl. Phy

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“…We select events (from the one prong and the minimum bias data) with exactly one or exactly three long tracks with a total charge of -1 and with at most four photons. The missing mass square was calculated MM 2 = ( E pd ; X E i ) 2 ; ( X p i ) 2 (1) with the sum extending over all seen charged and neutral particles, and it was required that the missing particle had a mass consistent with that of a proton: jMM 2 ; m 2 p j < 0:5 GeV 2 (2) Monte Carlo simulation showed that this cut does not lead to signi cant losses in the number of good events. But the cuts are su cient to identify the signals and to keep the background at an acceptable level.…”

Section: Data and Data Reductionmentioning

confidence: 99%

Test of $\overline{\mbox N}$ N potential models: Isospin relations in $\overline{\mbox p}$ d annihilations at rest and the search for quasinuclear bound states

Abele

2000

Eur. Phys. J. C

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Abstract. We h a ve determined branching ratios for antiproton annihilations at rest on protons or neutrons in liquid deuterium which w e compare to frequencies of isospin-related processes in antiproton-proton annihilations. Using the annihilation rates into 0 0 and ; 0 where the annihilation took place on the proton or neutron, respectively, w e discuss the fraction of S-wave and P-wave annihilation in liquid D2. T h e frequencies for ; ! and ; 0 , a n d ; and ; 0 and the corresponding frequencies for pp annihilations are used to determine isoscalar and isovector contributions to the protonium wave function. The isospin decomposition of the annihilating pp system in the 3 S1 or 1 S0 state is consistent with both, pure pp initial wave function and with the predictions of NN potential models. For the 3 P0 state of the pp atom we nd consistency with a pure pp system at annihilation while NN potential models predict large nn contributions. We o b s e r v e -! interference in pp! + ; and + ; 0 annihilation which w e compare to -! interference in e + e ; annihilation. The interference patterns show striking similarities due to similar phase relations the interference magnitude depends on the !-production ratio. The similarity of the phase in all 3 data sets demonstrates that isovector and isoscalar parts of the protonium (pp atomic) wave function are relatively real, again in con ict with NN potential models. The annihilation rate for pd!K ; K 0 p con rms the dominance of the isovector contribution to NN! KK annihilations. No complications due to initial state interactions are required by the data. Furthermore, we searched for narrow quasinuclear bound states close to the NN threshold, also predicted by NN potential models, but with negative outcome. We conclude that NN potential models are not suited to provide insight i n to the dynamics of the annihilation process.

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Manifestation of the pion pole in p → n charge-exchange scattering

Cited by 12 publications

References 18 publications

Antinucleon–nucleon interaction at low energy: scattering and protonium

Antinucleon–nucleon interaction at low energy: scattering and protonium

What have we learned from antiproton proton scattering?

Test of $\overline{\mbox N}$ N potential models: Isospin relations in $\overline{\mbox p}$ d annihilations at rest and the search for quasinuclear bound states

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