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Flux of light antimatter nuclei near Earth

Flux of light antimatter nuclei near Earth. K.V. Protasov for AMS groupe, Laboratory for Subatomic Physics and Cosmology, Grenoble, France. Motivations Secondary antimatter production - antiproton production (new paramertization)

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Flux of light antimatter nuclei near Earth

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  1. Flux of light antimatter nuclei near Earth K.V. Protasov for AMS groupe, Laboratory for Subatomic Physics and Cosmology, Grenoble, France • Motivations • Secondary antimatter production • - antiproton production (new paramertization) • - production of : coalescence model and • microscopic approach • Propagation in interstellar medium • Conclusions

  2. Motivations To explain matter-antimatter asymmetry in the univers AMS, PAMELA, BESS Primary antimatter: -Anti-stars, … - SUSY particles decay - Primordial black holes (low energy component) Secondary antimatter: interaction of cosmic rays with inerstellar gas (high energy component but…) It is important to determine a « background »

  3. First estimations P.Chardonnet, J.Orloff and P.Salati Phys.Lett. B409 (1997) 313-320 • F.Donato, N.Fornengo and P.Salati Phys.Rev. D62 (2000) 043003 • Our aims: • To improve predictions for the cross sections of antimatter production • To study antideutron spectrum at low energies

  4. Parametrization of antiproton spectrum Quite good experimental information but only a few parametrizations (hardly valid in a large cinematic and atomic number domain) R.P. Duperray, C.Y. Huang. K.V.Protasov and M.Buénerd Phys. Rev D 68, 094017 (2003) 654 compatible experimental points

  5. Light antinuclei production in p-p and p-A collisions • Standart coalescence model Projectile Fragment Target The (anti) nucleons can coalesce to form a fragment if their relative momentum is smaller than a certain quantity , (coalescence momentum) is a free parameter to be fitted from the data

  6. 34 compatibles experimental points

  7. LPCC, 5 Décembre 2003 Antimatière secondaire galactique • Microscopic coalescence model: diagramme approach p R.P. Duperray, K.V. Protasov, A.Yu. Voronin, Eur. Phys. J. A16 (2003) 27 R.P. Duperray, K.V. Protasov, L. Dérome, M. Buénerd. Eur. Phys. J. A18 (2003) • Direct calculation of the Feynmann diagramme within the microscopic coalescence model without any free parameter. (V.M. Kolybasov & Yu.N. Sokolskikh, Phys.Lett. B225 (1989) 31) M others p or A • This diagramme gives major contribution to the process probability due to mutual cancellation of other contributions (M.A. Braun & V.V. Vechernin, Sov. J. Nucl. Phys. 44 (1986) 506; 36 (1982) 357). • The antinucleons produced in this collision (bloc M) are «slightly virtual» and can fuse without additional interaction with nuclear field

  8. Comparaison with experimental data: antideuteron Without any free parameter Good knowledge of the antiproton production spectrum is required

  9. Comparaison with expérimental data: antitritium (antihélium) CERN data

  10. Propagation • Leaky Box Model / Diffusion Model • Elastic and inelastic (non destructive) scattering of antideuterons are taken into account • Antideutron production in antiproton-ISM collisions is added

  11. Secondary antiprotons flux («exercice») Secondary antiproton flux on the Earth level. Solar modulation corresponds to the AMS-01 flight conditions The flux is well described by only secondary antiprotons

  12. Secondairy antideuterons flux This work: incertainties due to the coalescence model SUSY predictions Donato et al

  13. Secondary antimatter flux

  14. Perspectives for AMS (poles for simplicity) • AMS will probably « see » a few secondary antideuterons • Other light secondaires are excluded (the same conclusion as in P.Chardonnet et al) • One detected antinucleus, heavier then antideuteron, will be probably of primary origin

  15. Conclusions • Obtained results are based on experimental data and solid phenomenological approaches • flux is by one ordre higher than in previous calculations • Rescattering of ‘s can wash out the SUSY signal • Secondary flux is probably detectable whereas and ones are not

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