Production of d, t, 3He, and by 200 GeV protons

Bozzoli, W.; Bussiére, A.; Giacomelli, G.; Lesquoy, É.; Meunier, R.; Moscoso, L.; Müller, A.‐S.; Rimondi, F.; Zylberajch, S.

doi:10.1016/0550-3213(78)90373-5

Cited by 44 publications

(30 citation statements)

References 18 publications

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“…'s has previously been measured in p +p and p +A collisions at higher energies [3,4], this observation of <? 's is the first reported for A A collisions.…”

Section: Pacs Numbers: 2575+rmentioning

confidence: 60%

“…The simplest relativistic formulation of this is To compute the number of interactions sampled at each setting, multiply the upper limit values by \0~5p 3 /E assuming a deuteron mass particle. evaluated at the momentum P p {p)-j PdQy 1° a wide variety of experiments the did spectra are well reproduced by (3) and the value of B consistently falls in or near the range G-2)xlO~2 GeV 2 [4,5]. Using a value of Z?…”

Section: Fig 1 Experimental Layout Showing the Beam-line Spec-mentioning

confidence: 76%

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Measurements at 0° of negatively charged particles and antinuclei produced in collisions of 14.6AGeV/cSi on Al, Cu, and Au targets

et al. 1992

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We report measurements of d y p, K ", and n~ produced at 0° in collisions of 14.6^4 GeV/c 28 Si on Al, Cu, and Au targets. A beam-line focusing spectrometer was used to identify particles at rigidities from -2 to -8 GV. The ratio of dip invariant cross sections at midrapidity (y^U)is (1 ±0.7) x 10~5, larger than expected from a calculation of dd direct production but smaller than predicted by a simple coalescence model. We also report limits on the production of exotic particles. PACS numbers: 25.75.+rThe yield of antinucleons and antinuclei from nucleusnucleus collisions is regarded as a sensitive probe of the space-time evolution of the interactions [lL We have performed an experiment to measure p and d production in \A.6A GeV/c S\ + A collisions at the Brookhaven National Laboratory Alternating Gradient Synchrotron (AGS) using a two-segment focusing beam-line spectrometer to measure long-lived (r>:10 ns), negatively charged particles produced _at 0°. We report here cross sections of n ~, K ~, p, and d, and we discuss limits on the production of new, stable, negatively charged high-mass particles, such as strangelets [2].Although the production of

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“…'s has previously been measured in p +p and p +A collisions at higher energies [3,4], this observation of <? 's is the first reported for A A collisions.…”

Section: Pacs Numbers: 2575+rmentioning

confidence: 60%

Section: Fig 1 Experimental Layout Showing the Beam-line Spec-mentioning

confidence: 76%

Measurements at 0° of negatively charged particles and antinuclei produced in collisions of 14.6AGeV/cSi on Al, Cu, and Au targets

et al. 1992

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“…The weakly bound P (deuteron type structure) can be produced for example by coalescence of a proton or a neutron with a D − s , analogous to the production of a deuteron by coalescence of a neutron and a proton. The data [35] give roughly 10 −3 for the σ(d)/σ(p) production ratio. This ratio can also be applied to σ(P )/σ(D − s ) production.…”

Section: Pentaquark Production Mechanismsmentioning

confidence: 93%

How to search for pentaquarks in high energy hadronic interactions

Moinester

Ashery

Landsberg

et al. 1996

Z. Physik A - Hadrons and Nuclei

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The strange-anticharmed Pentaquark is a uudcs or uddcs five-quark baryon that is expected to be either a narrow resonance, or possibly even stable against strong and electromagnetic decay. We describe this hyperon here, its structure, binding energy and lifetime, resonance width, production mechanisms, production cross sections, and decay modes. We describe techniques to reduce backgrounds in search experiments and to optimize the conditions for Pentaquark observation. Possibilities for enhancing the signal over background in Pentaquark searches are investigated by examining predictions for detailed momentum and angular distributions in multiparticle final states. General model-independent predictions are presented as well as those from two models: a loosely bound D 6 − 10 7 reconstructed charmed baryon events, should have sensitivity to determine whether or not the Pentaquark exists.

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“…Experimental data on the anti-He (or anti-tritium) production are extremely scarce in the literature and they refer uniquely to proton-nucleus [20][21][22][23] or heavy-ions collisions [24] whose dynamics is clearly very different from the one of a DM pair annihilation reaction. Thus, we decide to use as a reference value for the coalescence momentum p coal the one that was found in [10] to reproduce, within the same MC coalescence algorithm, the antideuteron production rate in e + e − collisions at the Z resonance measured by the Aleph collaboration at the LEP collider [25], i.e.…”

Section: Jhep08(2014)009mentioning

confidence: 99%

Anti-helium from dark matter annihilations

Cirelli

Fornengo

Taoso

et al. 2014

J. High Energ. Phys.

112

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Galactic Dark Matter (DM) annihilations can produce cosmic-ray anti-nuclei via the nuclear coalescence of the anti-protons and anti-neutrons originated directly from the annihilation process. Since anti-deuterons have been shown to offer a distinctive DM signal, with potentially good prospects for detection in large portions of the DM-particle parameter space, we explore here the production of heavier anti-nuclei, specifically antihelium. Even more than for anti-deuterons, the DM-produced anti-He flux can be mostly prominent over the astrophysical anti-He background at low kinetic energies, typically below 3-5 GeV/n. However, the larger number of anti-nucleons involved in the formation process makes the anti-He flux extremely small. We therefore explore, for a few DM benchmark cases, whether the yield is sufficient to allow for anti-He detection in currentgeneration experiments, such as Ams-02. We account for the uncertainties due to the propagation in the Galaxy and to the uncertain details of the coalescence process, and we consider the constraints already imposed by anti-proton searches. We find that only for very optimistic configurations might it be possible to achieve detection with current generation detectors. We estimate that, in more realistic configurations, an increase in experimental sensitivity at low kinetic energies of about a factor of 500-1000 would allow to start probing DM through the rare cosmic anti-He production.

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Production of d, t, 3He, and by 200 GeV protons

Cited by 44 publications

References 18 publications

Measurements at 0° of negatively charged particles and antinuclei produced in collisions of 14.6AGeV/cSi on Al, Cu, and Au targets

Measurements at 0° of negatively charged particles and antinuclei produced in collisions of 14.6AGeV/cSi on Al, Cu, and Au targets

How to search for pentaquarks in high energy hadronic interactions

Anti-helium from dark matter annihilations

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