Low Energy Antiproton Physics

Amsler, C.; Myhrer, F.

doi:10.1146/annurev.ns.41.120191.001251

Cited by 121 publications

(88 citation statements)

References 85 publications

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“…Thē p-selfenergy is dominated by the antiproton annihilation with baryons (p + B → X) as shown by low energy antiproton-nucleon scattering experiments at LEAR [26,27]. Since the antiproton production probability at subthreshold energies is extremly low the number of antiprotons produced in heavy-ion collisions and proton-nucleus collisions is negligible compared to the number of baryons involved in the reaction.…”

Section: Models For the Antiproton Selfenergymentioning

confidence: 99%

Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

et al. 1994

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We calculate the subthreshold production of antiprotons in the Lorentzcovariant RBUU approach employing a weighted testparticle method to treat the antiproton propagation and absorption nonperturbatively. We find that the antiproton differential cross sections are highly sensitive to the baryon and antiproton selfenergies in the dense baryonic environment. Adopting the baryon scalar and vector selfenergies from the empirical optical potential for proton-nucleus elastic scattering and from Dirac-Brueckner calculations at higher density ρ > ρ 0 we examine the differential antiproton spectra as a function of the antiproton selfenergy. A detailed comparison with the available experimental data for p-nucleus and nucleus-nucleus reactions shows that the antiproton feels a moderately attractive mean-field at normal nuclear matter density ρ 0 which is in line with a dispersive potential extracted from the free annihilation cross section. † Supported by BMFT, GSI Darmstadt and KFA Jülich.

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Section: Models For the Antiproton Selfenergymentioning

confidence: 99%

Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

et al. 1994

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“…When in close contact baryons and antibaryons promptly annihilate each other producing mesons in the final state. These reactions have been actively studied in 80's and 90's, most extensively at LEAR (see reviews [1,2]). In particular, many attempts have been made to find N N bound states with mass close to the threshold [3], but up to now no clear evidence was found (see, however, the recent paper [4]).…”

Section: Introductionmentioning

confidence: 99%

Antibaryons bound in nuclei

et al. 2005

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We study the possibility of producing a new kind of nuclear systems which in addition to ordinary nucleons contain a few antibaryons (B = p, Λ, etc.). The properties of such systems are described within the relativistic mean-field model by employing G-parity transformed interactions for antibaryons. Calculations are first done for infinite systems and then for finite nuclei from 4 He to 208 Pb. It is demonstrated that the presence of a real antibaryon leads to a strong rearrangement of a target nucleus resulting in a significant increase of its binding energy and local compression. Noticeable effects remain even after the antibaryon coupling constants are reduced by factor 3 − 4 compared to G-parity motivated values. We have performed detailed calculations of the antibaryon annihilation rates in the nuclear environment by applying a kinetic approach. It is shown that due to significant reduction of the reaction Q-values, the in-medium annihilation rates should be strongly suppressed leading to relatively long-lived antibaryonnucleus systems. Multi-nucleon annihilation channels are analyzed too. We have also estimated formation probabilities of bound B + A systems in pA reactions and have found that their observation will be feasible at the future GSI antiproton facility. Several observable signatures are proposed. The possibility of producing multi-quark-antiquark clusters is discussed.

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“…The measured inclusive single meson spectra are all Maxwellian. At the same time experiments show that a surprisingly large part of NN annihilation proceeds through two body channels [1]. A substantial body of data has already been obtained from bubble chambers [2] and detailed experimental studies of two body branching ratios and their dependence on the quantum numbers of the initial states have recently been carried out at LEAR [1].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time experiments show that a surprisingly large part of NN annihilation proceeds through two body channels [1]. A substantial body of data has already been obtained from bubble chambers [2] and detailed experimental studies of two body branching ratios and their dependence on the quantum numbers of the initial states have recently been carried out at LEAR [1]. Various quark models [3][4][5][6][7][8] in the framework of three initial quarks and three antiquarks have been employed to calculate the two body branching ratios, but none of them reproduced the observed values accurately, some channels being off by five standard deviations, see [8] e.g.…”

Section: Introductionmentioning

confidence: 99%