First measurement of Donon in p elastic scattering

Kunne, R.; Beard, C. I.; Birsa, R.; Bos, K.; Bradamante, F.; Bugg, D.V.; Clough, A.S.; Torre-Colautti, S. Dalla; Edgington, J.A.; Giorgi, M. A.; Hall, J. R.; Heer, E.; Heß, R.; Kluyver, J.C.; Lechanoine‐Leluc, C.; Linssen, L.; Martin, A.; Niinikoski, T.; Onel, Y.; Penzo, A.; Rapin, D.; Rieubland, J. M.; Rijllart, A.; Schiavon, P.; Shypit, R.L.; Tessarotto, F.; Villari, A.

doi:10.1016/0370-2693(91)91349-z

Cited by 16 publications

(17 citation statements)

References 25 publications

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“…Thus, D nn = 1 in absence of spin forces. PS172 obtained the interesting result D nn = −0.169 ± 0.465 at cos ϑ = −0.169 for the momentum p lab = 0.679 GeV/c [71]. The effect persists at higher momentum, as seen in Fig.…”

Section: Spin Effects In Elastic and Charge-exchange Scatteringmentioning

confidence: 83%

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Antiproton Physics

Richard

2020

Front. Phys.

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We review the physics of low-energy antiprotons, and its link with the nuclear forces. This includes: antinucleon scattering on nucleons and nuclei, antiprotonic atoms and antinucleon-nucleon annihilation into mesons. Modern perspectives 39 Outlook 39 1 A brief historyIn 1932, the positron, the antiparticle of the electron, was discovered in cosmic rays and confirmed in the β + decay of some radioactive nuclei. See, e.g., the Nobel lecture by Anderson [1]. It was then reasonably anticipated that the proton also has an antiparticle, where A denotes the target nucleus. For A = p, this is a standard exercise in relativistic kinematics to demonstrate that the kinetic energy of the incoming proton should be higher than 6 m, where m is the proton mass, and c = 1. This threshold decreases if the target is more massive. The Bevatron was completed in 1954, and the antiproton was discovered in 1955 by a team lead by Chamberlain and Segrè, who were awarded the Nobel prize in 1959. 2 Shortly after the antiproton, the antineutron,n, was also discovered at Berkeley, and up to now, for any new elementary particle, the corresponding antiparticle has also been found. The discovery of the first anti-atom was well advertised [2], but this was not the case for the earlier observation of the first antinucleus, antideuterium, because of a controversy between an European team [3] and its US competitors [4]. In experiments at very high energy, in particular collisions of heavy ions at STAR (Brookhaven) and ALICE (CERN), one routinely produces light antinuclei and even anti-hypernuclei (in which an antinucleon is replaced by an antihyperonΛ) [5][6][7].The matter-antimatter symmetry is almost perfect, except for a slight violation in the sector of weak interactions, which is nearly exactly compensated by a simultaneous violation of the left-right symmetry, i.e., the product P C of parity P and charge-conjugation C is only very marginally violated. Up to now, there is no indication of any violation of the product CP T , where T is the time-reversal operator: this implies that the proton and antiproton have the same mass, a property now checked to less than 10 −9 [8].Many experiments have been carried out with low energy antiprotons, in particular at Brookhaven and CERN in the 60s and 70s, with interesting results, in particular for the physics of the mesons produced by annihilation. However, in these early experiments, the antiprotons were part of secondary beams containing many negativelycharged pions and kaons, and with a wide momentum spread.In the 70s, Simon van der Meer, and his colleagues at CERN and elsewhere imagined and developed the method of stochastic cooling [9], which produces antiproton beams of high purity, sharp momentum resolution, and much higher intensity than in the previous devices. CERN transformed the fixed-target accelerator SpS into a protonantiproton collider, SppS, with the striking achievement of the discovery of the W ± and Z 0 , the intermediate bosons of the electro-weak interaction. A similar scheme was lat...

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Section: Spin Effects In Elastic and Charge-exchange Scatteringmentioning

confidence: 83%

“…Transfer of polarization D nn in elasticpp scattering at p lab = 1.089 GeV/c[71] Depolarization parameter in the charge exchange reaction at 0.875 GeV/c[72] …”

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confidence: 99%

Antiproton Physics

Richard

2020

Front. Phys.

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“…9). For the elastic spin-transfer observable D nn a few data points have been measured [12], for the charge-exchange D nn data have been obtained recently [13].…”

Section: Resultsmentioning

confidence: 99%

Combined description ofN¯Nscattering and annihilation with a hadronic model

1995

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“…Data are taken from Refs. [75,67,76,73,77,78,79,80] (differential cross sections), [81,82,83] (analyzing powers), and [84] (D nn ). Note that contributions from J ≥ 5 become relevant for momenta above 400 MeV/c, but primarily at backward angles.…”

Section: Observablesmentioning

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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First measurement of Donon in p elastic scattering

Cited by 16 publications

References 25 publications

Antiproton Physics

Antiproton Physics

Combined description ofN¯Nscattering and annihilation with a hadronic model

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

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