Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

Larionov, A. B.; Lenske, H.

doi:10.1016/j.nuclphysa.2016.10.006

Cited by 14 publications

(17 citation statements)

References 51 publications

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“…The parameters σ tot pn and Bp n are chosen to be equal to the correspondingpp parameters according to ref. [34]. However, in the present work, we fix ρp n = 0.05 which better agrees with phenomenological values of ρp p at beam momenta of 4-6 GeV/c [30].…”

Section: 13pn →Pnsupporting

confidence: 84%

Rescattering effects in antiproton-induced exclusive J/$ \psi$ and $ \psi^{{\prime}}_{}$ production on the deuteron

2019

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On the basis of the generalized eikonal approximation we study the exclusive reactionspd → J/ψ n andpd → ψ ′ n in vicinity of the thresholds for charmonium production on a free proton target. It is shown that the rescattering of the incoming antiproton and outgoing charmonium on the spectator neutron leads to a depletion of the charmonium production at low-and to an enhancement at high transverse momenta. This is in qualitative agreement with previous studies of hard proton knockout in proton-deuteron collisions. We analyze different physical sources of uncertainty which may influence the extraction of the total charmonium-neutron cross section.The color transparency effect for the incomingp largely compensates the influence of charmonium rescattering both at low and high transverse momenta. Different choices of the deuteron wave function lead to significant uncertainties at high transverse momenta. As an outcome of the calculations of charmonium production, we also provide predictions on the production of open charm hadrons due to the dissociation of the charmonium on the neutron. It is shown that the open charm production cross section is proportional to the total charmonium-nucleon cross section and quite stable with respect to the variation of other parameters of the model. We thus suggest that open charm channels are most suited for future studies of charmonium-nucleon interactions at PANDA with a deuteron target.

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Section: 13pn →Pnsupporting

confidence: 84%

Rescattering effects in antiproton-induced exclusive J/$ \psi$ and $ \psi^{{\prime}}_{}$ production on the deuteron

2019

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“…A relativistic mean-field approach was attempted years ago by Bouyssy and Marcos [126] and revisited more recently [127]. Meanwhile, a Glauber approach has been formulated [128] and applied to the elastic and inelastic scattering of relativistic antiprotons.…”

Section: Antiproton-nucleus Dynamicsmentioning

confidence: 99%

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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“…In numerical calculations we applied the momentum dependent totalpN cross section and the ratio αp N as described in Ref. [21]. We assumed that σΛ N = σp N at the same beam momenta which is supported by experimental data on the totalΛp cross section at p lab = 4 ÷ 14 GeV/c [22].…”

Section: The Modelmentioning

confidence: 99%

Distillation of scalar exchange by coherent hypernucleus production in antiproton–nucleus collisions

Larionov

Lenske

2017

Physics Letters B

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The total and angular differential cross sections of the coherent processp + A Z → A Λ (Z − 1) +Λ are evaluated at the beam momenta 1.5 ÷ 20 GeV/c within the meson exchange model with bound proton and Λ-hyperon wave functions. It is shown that the shape of the beam momentum dependence of the hypernucleus production cross sections with various discrete Λ states is strongly sensitive to the presence of the scalar κ-meson exchange in thepp →ΛΛ amplitude. This can be used as a clean test of the exchange by scalar πK correlation in coherentpA reactions.

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Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

Cited by 14 publications

References 51 publications

Rescattering effects in antiproton-induced exclusive J/$ \psi$ and $ \psi^{{\prime}}_{}$ production on the deuteron

Rescattering effects in antiproton-induced exclusive J/$ \psi$ and $ \psi^{{\prime}}_{}$ production on the deuteron

Antiproton Physics

Distillation of scalar exchange by coherent hypernucleus production in antiproton–nucleus collisions

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