Particle production and search for long-lived particles in 200–240 GeV/c proton-nucleon collisions

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

doi:10.1016/0550-3213(80)90187-x

Cited by 33 publications

(33 citation statements)

References 13 publications

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“…2 is less than 0.2 fm [13]. For a variety of ion beams ranging from He to Ar incident on nuclear targets at BEVALAC energies [15], as well as p+A fixed target experiments at FNAL [16], KEK [17] and SPS [18] [34,35]. This is similar to the behavior seen in HBT radii [36,37].…”

Section: A B2 and The Homogeneity Volumesupporting

confidence: 55%

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=
Arsene¹,
Bearden²,
Beavis³
et al. 2011
Phys. Rev. C
17
0
2
0
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We have measured the distributions of protons and deuterons produced in the 20% most central Au+Au collisions at RHIC ( √ s NN = 200 GeV) over a very wide range of transverse and longitudinal momentum. Near midrapidity we have also measured the distribution of antiprotons and antideuterons. We present our results in the context of coalescence models. In particular we extract the "homogeneity volume" and the average phase-space density for protons and antiprotons. Near central rapidity the coalescence parameter B2(pT ) and the space-averaged phase-space density f (pT ) are very similar for both protons and antiprotons. For protons we see little variation of either B2(pT ) or the space-averaged phase-space density as the rapidity increases from 0 to 3. However, these quantities depend strongly on pT at all rapidities. These results are in contrast to data from lower energy collisions where the proton and antiproton phase-space densities are different at y=0 and both B2 and f depend strongly on rapidity.

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Section: A B2 and The Homogeneity Volumesupporting

confidence: 55%

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=
Arsene¹,
Bearden²,
Beavis³
et al. 2011
Phys. Rev. C
17
0
2
0
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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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“…Using the data for the production of d in ppcollisions at ~ = 45 GeV and ~ = 53 GeV and for the production of 3 He at -IS' = 19.4 GeV Gibson et al, 1978;Bussiere et al, 1980) the following fits for the invariant cross-sections -3 -for the production of d and He were obtained:…”

Section: Methodsmentioning

confidence: 99%

The flux of secondary anti-deuterons and antihelium produced in the interstellar medium

Allkofer

Brockhausen

1985

Astrophys Space Sci

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Particle production and search for long-lived particles in 200–240 GeV/c proton-nucleon collisions

Cited by 33 publications

References 13 publications

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=
Arsene¹,
Bearden²,
Beavis³
et al. 2011
Phys. Rev. C
17
0
2
0
View full text Add to dashboard Cite

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=
Arsene¹,
Bearden²,
Beavis³
et al. 2011
Phys. Rev. C
17
0
2
0
View full text Add to dashboard Cite

Anti-helium from dark matter annihilations

The flux of secondary anti-deuterons and antihelium produced in the interstellar medium

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Particle production and search for long-lived particles in 200–240 GeV/c proton-nucleon collisions

Cited by 33 publications

References 13 publications

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=Arsene1, Bearden2, Beavis3 et al. 2011Phys. Rev. C17020View full textAdd to dashboardCite

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=Arsene1, Bearden2, Beavis3 et al. 2011Phys. Rev. C17020View full textAdd to dashboardCite

Anti-helium from dark matter annihilations

The flux of secondary anti-deuterons and antihelium produced in the interstellar medium

Contact Info

Product

Resources

About

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=
Arsene¹,
Bearden²,
Beavis³
et al. 2011
Phys. Rev. C
17
0
2
0
View full text Add to dashboard Cite

Rapidity dependence of deuteron production in centralAu+Aucollisions atsNN=
Arsene¹,
Bearden²,
Beavis³
et al. 2011
Phys. Rev. C
17
0
2
0
View full text Add to dashboard Cite