First measurement of the depolarization parameter D0n0n at 546 and 875 MeV /c

Ahmidouch, A.; Heer, E.; Heß, R.; Lechanoine‐Leluc, C.; Mascarini, C.; Rapin, D.; Birsa, R.; Bradamante, F.; Torre-Colautti, S. Dalla; Giorgi, M. A.; Lamanna, M.; Martin, A.; Penzo, A.; Schiavon, P.; Tessarotto, F.; Macciotta, M.P.; Masoni, A.; Puddu, G.; Serci, S.; Niinikoski, T.; Rijllart, A.; Catz, H.; Faivre, J.C.; Perrot‐Kunne, F.; Arvieux, J.; Bertini, R.; Kunne, R.; Agnello, M.; Iazzi, F.; Minetti, B.; Bressani, T.; Chiavassa, E.; Marco, N. De; Musso, A.; Piccotti, A.

doi:10.1016/0550-3213(95)00147-k

Cited by 11 publications

(10 citation statements)

References 42 publications

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“…Furthermore, I take the opportunity to briefly recall the status of our knowledge of the spin dependence of thē N N . Thereby I focus on the only double-polarization observables measured so far, namely the depolarization parameter D N N and the spin parameter K N N [17,18,19,20] Besides of using polarized protons as target one could also use light nuclei as possible source for the antiproton polarization buildup. A corresponding investigation for antiproton scattering on deuterons was presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

Spin dependence of the antinucleon-nucleon interaction

Haidenbauer¹

2011

J. Phys.: Conf. Ser.

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Abstract. The status of our present knowledge on the antinucleon-nucleon interaction at low and medium energies is discussed. Special emphasis is put on aspects related to its spin dependence which are relevant for experiments planned by the PAX collaboration. Predictions for the spin-dependentpp cross sections σ1 and σ2 are presented, utilizingN N potential models developed by the Jülich group, and compared to results based on the amplitudes of the Nijmegen partial-wave analysis.

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Section: Introductionmentioning

confidence: 99%

Spin dependence of the antinucleon-nucleon interaction

Haidenbauer¹

2011

J. Phys.: Conf. Ser.

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“…Data are taken from Refs [85,71,86,80,87]. (differential cross sections),[88,89,87]. (analyzing powers), and[89] (D nn ).…”

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confidence: 99%

“…(differential cross sections),[88,89,87]. (analyzing powers), and[89] (D nn ). Note that the data for A on are for 546 and 656 MeV/c, respectively.…”

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confidence: 99%

Antinucleon-nucleon interaction at next-to-next-to-next-to-leading order in chiral effective field theory

Dai¹,

Haidenbauer²,

Meißner³

2017

J. High Energ. Phys.

130

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Abstract:Results for the antinucleon-nucleon (N N ) interaction obtained at next-to-nextto-next-to-leading order in chiral effective field theory (EFT) are reported. A new local regularization scheme is used for the pion-exchange contributions that has been recently suggested and applied in a pertinent study of the N N force within chiral EFT. Furthermore, an alternative strategy for estimating the uncertainty is utilized that no longer depends on a variation of the cutoffs. The low-energy constants associated with the arising contact terms are fixed by a fit to the phase shifts and inelasticities provided by a phase-shift analysis ofpp scattering data. An excellent description of theN N amplitudes is achieved at the highest order considered. Moreover, because of the quantitative reproduction of partial waves up to J = 3, there is also a nice agreement on the level ofpp observables. Specifically, total and integrated elastic and charge-exchange cross sections agree well with the results from the partial-wave analysis up to laboratory energies of 300 MeV, while differential cross sections and analyzing powers are described quantitatively up to 200-250 MeV. The low-energy structure of theN N amplitudes is also considered and compared to data from antiprotonic hydrogen.

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“…[21],e.g., by comparing Figs. 10.1 through 10.6 of Ahmidouch's Ph.D. Thesis [21], all MEP models predict a maximum peak at non-zero but forward angles in the D onon pp → nn observable. This forward D onon peak is again mainly due to V π and V 2π .…”

Section: The Two-pion Exchange Potentialmentioning

confidence: 99%

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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First measurement of the depolarization parameter D0n0n at 546 and 875 MeV /c

Cited by 11 publications

References 42 publications

Spin dependence of the antinucleon-nucleon interaction

Spin dependence of the antinucleon-nucleon interaction

Antinucleon-nucleon interaction at next-to-next-to-next-to-leading order in chiral effective field theory

What have we learned from antiproton proton scattering?

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