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Light Antimatter Production in High Energy Collisions with DCPC Model

Light Antimatter Production in High Energy Collisions with DCPC Model. Gang Chen China University of Geosciences, Wuhan Collaborators Yu-Liang Yan, Ben-Hao Sa (CIAE, China) Dai-Mei zhou (CCNU, China) 2014.4.21.

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Light Antimatter Production in High Energy Collisions with DCPC Model

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  1. Light Antimatter Production in High Energy Collisions with DCPC Model Gang Chen China University of Geosciences, Wuhan Collaborators Yu-Liang Yan, Ben-Hao Sa(CIAE, China) Dai-Mei zhou (CCNU, China) 2014.4.21 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  2. Outline • Found hypernuclei • Analysis Method • The Results in pp collision and AuAu collision • Summary 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  3. Found hypernuclei 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  4. S=-2 S=-1 S=-0 from Hypernuclei to Neutron Stars • hypernuclei L-B Interaction Neutron Stars Saito, HYP06 • Propose Several possible configurations of Neutron Stars • Kaon condensate, hyperons, strange quark matter J.M. Lattimer and M. Prakash, "The Physics of Neutron Stars", Science 304, 536 (2004) J. Schaffner and I. Mishustin, Phys. Rev. C 53 (1996): Hyperon-rich matter in neutron stars 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  5. Tracks in TPC • It is first fonud nuclear contain anti-strange quark; • The chart of nuclides is expand to the new anti-strange matter region. 5

  6. Measured invariant hypernucleiyields STAR, Science 328 (2010) 58 70±17 antihypertritons 157 ±30 hypertritons About 89 million minimum-bias events 22 million most central collisions events 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  7. Measured invariant ratios 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  8. Found hypernuclei in the high energy collision exp. Production of antinuclei in pp collisions at 7 TeV with ALICE at the LHC Raw yield of anti deuterons as a function transverse momentum N. Sharma ( ALICE) J.Phys.G 38 (2011);arXiv:1104.3311v2 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  9. Found hypernuclei in the high energy collision exp. Observation of the antimatter helium-4 nucleus with the STAR Collaboration (STAR) N AT U R E 4 7 3 (2 0 1 1) 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  10. The discovery for hypernuclei in the high energy experiment have been widely fascinating the sights of nuclear physicists. So we try to proposed a dynamically constrained phase space coalescence model + PACIAE model and used to investigate the production of light nuclei (anti-nuclei) in high energy collisions . 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  11. Analysis Method PACIAE model It is the parton and hadron cascade Model based on PYTHIA. 1. The string fragmentation in PYTHIA is switched-off temporarily and the diquarks (anti-diquarks) are broken randomly into quarks (antiquarks), so the parton initial state is obtained. 2. The parton rescattering is proceeded until partonic freez-out. 3. Then the hadronization is followed. 4. At last the hadronic rescattering is proceeded until hadronic freez-out. Ben-Hao Sa ,etal. Comput. Phys. Commun., 183, 333 (2012). 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  12. Analysis Method Dynamically constrained phase space coalescence model In the theoretical studies, the yield of light nuclei (anti-nuclei) is usually calculated in two steps: (1)The nucleons and hyperons are calculated by the transport model. (2)The light nuclei (anti-nuclei) are calculated by the phase space coalescence model with Wigner function or by the statistical model . This coalescence model strongly relies upon the assumption of light nuclei (anti-nuclei) wave function used to construct the Wigner function . The statistical model strongly relies upon the equilibrium assumption and the fitted temperature and baryon chemical potential. We proposed a dynamically constrained phase space coalescence model to calculate the yield of light nuclei (anti-nuclei) after the transport model simulations. Ben-Hao Sa ,etal. Comput. Phys. Commun., 183, 333 (2012). Yu-Liang Yan, Gang Chen et al, Phys. Rev. C 85 024907 (2012). 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  13. Dynamically constrained phase space coalescence model As the uncertainty principle one can only say particle lies somewhere within a six dimension quantum ``box" or “state" of volume of ΔqΔp However,we can estimate the yield of a single particle by Similarly for the yield of N particles cluster 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  14. Dynamically constrained phase space coalescence model The yield of , for instance, is assumed to be m0 and D0 stand for the rest mass and diameter of Δm refers to the allowed uncertainty. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  15. The Results in p+p coll. Yu-Liang Yan, Gang Chen et al, Phys. Rev. C 85 024907 (2012). The model parameters are fitted to the STAR data of strange particles as shown in the following table. TABLE I: Particle yield in NSD pp collisions at = 0.2 TeV. B. I. Abelev, et al., STAR , Phys. Rev. C 75 064901 (2007). Then they are used to calculate the yield of D, 3He, and , etc., 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  16. The Results of Hadron and light (anti)nuclei in p+p coll. Hadron and light nuclei (anti-nuclei) yields in NSD p+p collisions at =7 and 14 TeV calculated by final hadronic state in the PACIAE and PYTHIA simulations. a Calculated with △m=0.0005 GeV. b Estimated from ALICE Data , J.Phys.G 38(2011) c Calculated with △m=0.005 GeV. predict the light (anti)nuclei yield in ppcollisions at √s = 7 and 14 TeV. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  17. FIG. 1: Transverse momentum distributions of light anti-nuclei in the NSD pp collisions at = 7 and 14 TeV with PACIAE and PYTHIA model The green dots are ALICE data . The Results in p+p coll. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  18. The Results in p+p coll. The strong fluctuation, indicates that the 1.2 x108 events are not enough for the pT and y distribution of the particles. FIG. 1: Rapidity distributions of light anti-nuclei in the NSD pp collisions at =7 and 14 TeV with PACIAE and PYTHIA model 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  19. The Results in Au+Au coll.at =200 GeV Chen Gang Yu-Liang Yan et al , PRC 86, 054910(2012) The model parameters are fitted to the STAR data of strange particles as shown in the following table. Then they are used to calculate the yield of D, 3He, and , etc., Hadron yields from Model in comparison with the STAR data STARa, PRL 98, 062301 (2007) A. Andronic et al., PLB 697, 203 (2011) Obviously, the model results are very close to the data exp 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  20. The Results in Au+Au coll.at =200 GeV Light (anti)nuclei yields of models in comparison with the STAR f Δm=0.0003 GeV. bΔm=0.00015 GeV. The yields in PACIAE model simulation are consistent with STAR data. egh The STAR, Science 328, 58 (2010); a L. Xue,Y. G. Ma et al.,PRC. 85 064912 (2012). c A. Andronic,et al., PLB 697(2011) Chen Gang et al , PRC 86, 054910(2012) 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  21. The Results in Au+Au coll.at =200 GeV The comparison of particles ratios between data and model calculations. Chen Gang et al , PRC 86, 054910(2012) Light (anti)nuclei ratio in comparison with the STAR data The STAR yield ratios are good reproduced. Δm=0.0003 GeV for D, Δm=0.00015 GeV for , , , 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  22. The Results in Au+Au coll.at =200 GeV Transverse momentum distributions of light (anti)nuclei . Chen Gang et al , PRC 86, 054910(2012) 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  23. The Centrality dependenceof light anti-nuclear produced in Au+Au coll. Chen Gang et al , PRC 88, 034908(2013) FIG. 1. The integrated yield dN/dy of strange particle at midrapidity Au+Au collisions at 200 GeV as a function of centrality. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  24. The Centrality dependenceof light anti-nuclear produced in Au+Au coll. Chen Gang et al , PRC 88, 034908(2013) TAB I: Integrated yields dN/dy calculated by PACIAE+DCPC model . Δm=0.00035GeV for D, ; Δm=0.0002 GeV for , , , 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  25. The Centrality dependenceof light anti-nuclear produced in Au+Au coll. Chen Gang et al , PRC 88, 034908(2013) FIG. 2: Light nuclei and anti-nuclei cumulative yields STAR ,Science 328, 58 (2010) STAR ,arXiv:0909.0566 PHENIX , PRL. 94 , 122302 (2005). The yields in PACIAE model simulation are consistent with Exp. data. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  26. The Centrality dependenceof light anti-nuclear produced in Au+Au coll. Chen Gang et al , PRC 88, 034908(2013) Defined a normalized yield The curves are fitted by Theoretical and exp. results of yields in different centrality bins can be converted into the constant yield YMBfor direct comparison. FIG. 3: The normalized yield yc 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  27. The Centrality dependenceof light anti-nuclear produced in Au+Au coll. Chen Gang et al , PRC 88, 034908(2013) FIG. 4: Yield ratios The yield ratios of also remain unchanged from central to peripheral coll. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  28. Scaling Properties of light antinuclei production in Au+Au coll. Hecke, Sorge, Xu, PRL. 81, 5764 (1998). STAR , Nature 473,353 (2011); L. Xue,Y. G. Ma,PRC85, 064912 (2012) Figure 1:

  29. Scaling Properties of light antinuclei production in Au+Au coll. Chen Gang, arXiv:1401.6872, 2014 149MeV for 0-5%, 142 MeV for MB, 125 MeV for 40-60% Figure 2: Atomic number dependence of the integrated yield dN/dy of light (anti)nuclei in different centrality bins. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  30. Scaling Properties of light antinuclei production in Au+Au coll. Chen Gang, arXiv:1401.6872, 2014 The existence of a mass scale properties? 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  31. Scaling Properties of light antinuclei production in Au+Au coll. Defined a ratio of yield per Npart Figure 3: The integrated yield dN/dy at midrapidity divided by Npart, normalized to the peripheral collisions (40-60%),. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  32. Summary • We proposed a dynamically constrained phase space coalescencemodel to calculate the light (anti)nuclei in high enerngy collisions, • The results turned out that it would be an effective method investigating the production of light (anti)nuclei in high energy collisions. • Predict the light (anti)nuclei yield, transverse momentum and the rapidity distribution in ppcollisions at √s = 7 and 14 TeV . • Study centrality dependence of light anti-nuclear produced in Au+Au collisions. • Discussed the scaling properties of light antinuclei production in Au+Au collisions. 中国物理学会高能物理分会第九届全国会员代表大会暨学术年会

  33. Thanks for yourattention!

  34. Larry,Robert. Pisarski,NPA 796, 83, 2007. Torrieri, Vogel, Bauchle,PRL111, 012301, 2013.

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