Can thermal model explain (anti)lambda/(anti)p puzzle?

• Autorzy: Bravina L. , Tywoniuk K. , Zabrodin E.
• Konferencja: Proceedings of the 18th International conference on Nucleus-Nucleus Collisions QUARK MATTER 2005, 4-9 August, 2005, Budapest, Hungary
• Języki publikacji: EN

Abstrakty

EN

The abnormally high antilambda-to-antiproton ratio, which is close to 3.6 for central Au+Au collisions at 11.7 AGeV/c, was reported by the E917 Collaboration. Conventional thermal models and microscopic transport models generally predict that the ratio should be below unity. We show that this large value of the ratio can be reproduced within a two-source statistical model of an ideal hadron gas, which employs non-uniform distribution of net baryon charge and net strangeness within the reaction volume. The two sources are assumed to reach the chemical and thermal equilibrium separately and may have different temperatures, strangeness densities, etc. Other hadron yields and ratios measured for the reaction are reproduced quite well.

Słowa kluczowe

EN

ultrarelativistic heavy-ion collisions; statistical model of hadron gas; two-source model (TSM)

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2006
• Tom: Vol. 51,suppl.3
• Strony: 7--10
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Bravina L.

autor

Tywoniuk K.

autor

Zabrodin E.

• Department of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, Norway and Institute for Nuclear Physics, Moscow State University, RU-119899 Moscow, Russia, Tel.: [phone], Fax: [phone],

Bibliografia

• 1. Back BB et al. (E917 Collaboration) (2001) Antilambda production in Au+Au collisions at 11.7 AGeV/c. Phys Rev Lett 87:242301
• 2. Bravina LV, Zabrodin EE, Gorenstein MI et al. (1999) Local equilibrium in heavy-ion collisions: microscopic model versus statistical model analysis. Phys Rev C 60:024904
• 3. Fermi E (1950) High-energy nuclear events. Prog Theor Phys 5:570?583
• 4. Hoehne C et al. (NA49 Collaboration) (2005) Results from NA49. APS arXiv:nucl-ex/0510049
• 5. Landau LD (1953) On the multiparticle production in high-energy collisions. Izv Akad Nauk Ser Fiz 17:51?64 (in Russian)
• 6. Lu ZD, Faessler A, Fuchs A, Zabrodin EE (2002)Analysis of particle production in ultrarelativistic heavyion collisions within a two source statistical model. Phys Rev C 66:044905
• 7. Torrieri G, Steinke S, Broniowski W, Florkowski W,Letessier J, Rafelski J (2005) SHARE: statistical hadronization with resonances. Comput Phys Commun 167:229?251
• 8. Wheaton S, Cleymans J (2004) THERMUS: a thermal model package for ROOT. APS arXiv:hep-ph/0407174