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N* production from pp and ` pp collisions

N* production from pp and ` pp collisions. (Recent Research of Our Group). Jia-Jun Wu IHEP, CAS In collaboration with Xu Cao, Zheng Ouyang, R. Molina, E. Oset, B. S. Zou. Outline. Introduction / Motivation The N* production in pp and ` pp collisions with P ` p/p below 4 GeV.

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N* production from pp and ` pp collisions

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  1. N* production from pp and`pp collisions (Recent Research of Our Group) Jia-Jun Wu IHEP, CAS In collaboration with Xu Cao, Zheng Ouyang, R. Molina, E. Oset, B. S. Zou

  2. Outline • Introduction / Motivation • The N* production in pp and`pp collisions with P`p/p below 4 GeV. `p/p p g`p/p n p+ `N/N N g`N/N N p p • Some new N* with hidden charm/beauty production in`pp collisions with P`p/p above 10 GeV. `p p g`p p hc/hb `p p g`p p J/y • Summary Jiajun Wu Baryon’10

  3. Introduction • In Experiment: 1 For pp collision: 2 For`pp collision: There are so many experiments for pp collision, such as CELSIUS, COSY, KEK, Gatchina and so on. HIRFL-CSR will start soon Many data for us to analyses. Many experiments for N* were performed before 1990, with some additions from JETSET Collaboration at 1997. PANDA/FAIR will start soon A new place to study N*. Jiajun Wu Baryon’10

  4. Introduction 1. Need more methods to measure N*, giving more information of them. • In Theory: 1 Missing Resonance: 2 Mass Order Reverse: The number of predicted states is much more than that observed. How to Find? non-existence / to be observed ? 2. Need new model beyond the 3q model, Such as Cloud model, penta-quark models. In the constituent quark models N*(1440) 1/2+ ~ uud (n=1) N*(1535) 1/2- ~ uud (L=1) L*(1405) 1/2- ~ uds (L=1) How to Prove? Jiajun Wu Baryon’10

  5. Motivation 1. Using effective Lagrangian approach to do full analysis for the pp collision. Find N*s which give main contribution. On one hand we can study the nature of N* by these data. On the other hand, we can use these N*s to give predictions for`pp collision. We find`pp collision provide a nice place to study N*. 2. We expand multi-quark model by putting the charm quark and beauty quark in the N*. We find some heavy but narrow N* with hidden charm and beauty, which definitely cannot be accommodated by the conventional 3q quark models. They may be observed in the `pp collision. Jiajun Wu Baryon’10

  6. p p gp n p+ Considered N*: N*(1440),N*(1520), N*(1650),N*(1675), N*(1680),N*(2065), D(1232), D*(1600), D*(1620), D*(1700), D*(1905). Experiment data: CELSIUS,COSY Zhen Ouyang, Xie, B.S. Zou, Xu Nucl.Phys.A821:220-234,2009. Int.J.Mod.Phys.E18:281-292,2009. Jiajun Wu Baryon’10

  7. p p gp n p+ N*(1440) N*(1520) N*(1680) D(1232) N*(1440) N*(1440) N*(1680) D*(1620) N*(1520) N*(1675) D*(1600) D(1232) N*(1650) D*(1700) D*(1905) Zhen Ouyang, Xie, B.S. Zou, Xu Nucl.Phys. A821: 220-234,2009. Int.J.Mod.Phys.E18:281-292,2009. N*(2065) Jiajun Wu Baryon’10

  8. `p p g`p n p+ We consider the contribution of Nuclear Pole, D(1232), N*(1440), N*(1520), N*(1680). Because they are main contribution in the pp collision. JiaJun Wu, Zhen Ouyang, B.S. Zou Phys.Rev.C80:045211,2009.. Jiajun Wu Baryon’10

  9. Cleanest N*(1440) Peak Absence of the D++ state Jiajun Wu Baryon’10

  10. N/N N g`N/N N p p `pn g`npp-p- RgNM pp g nnp+p+ R1gR2M `pp g`pp (pp)0 pp g pp (pp)0 `pn g`pn p+p- Double-R Xu Cao, B.S. Zou, Xu Phys.Rev.C81:065201,2010. arXiv:1009.1060 arXiv:1009.1063 Jiajun Wu Baryon’10

  11. pp g nnp+p+ `pn g`npp-p- D*(1600)gN*(1440)p D*(1600)gN*(1440)p Double-D DgNpgNpp DgNpgNpp The cut-off parameters of D can be studied because 3 final particles are charged. Jiajun Wu Baryon’10

  12. pp g pp (pp)0 `pp g`pp (pp)0 Double-D N*(1440)gDp The new experiment in`pp collision is useful to check old data right or not. N*(1440)gNs Jiajun Wu Baryon’10

  13. `pn g`pn p+p- A more pure place for studying N*(1440) N*(1440) gDp N*(1440) gNs Jiajun Wu Baryon’10

  14. New N* : Theory for the Interaction SU(3) SU(4) E. Oset and A. Ramos Eur. Phys. J. A 44 445(2010) J. J. Wu, R. Molina, E. Oset and B. S. Zou,arXiv:1007.0573(PRL)arXiv:1011.2399 J. J. Wu, B. S. Zou,arXiv:1011.5743

  15. New N* with hidden charm/beauty • The unitary T amplitudes can be obtained by solving the coupled channels Bethe-Salpeter equation: From the T, we can find some poles. Jiajun Wu Baryon’10

  16. New N* with hidden charm/beauty Jiajun Wu Baryon’10

  17. The prediction for PANDA The`pbeam of 15 GeVone has the invariant mass of C.M. about 5470 MeV, which allows one to observe resonances in`pXproduction up to a mass M= 4538 MeV. From PB From VB Jiajun Wu Baryon’10

  18. The prediction for PANDA `pp ghc`pp 0.07—0.7mb Jiajun Wu Baryon’10

  19. The prediction for PANDA `ppg J/y`pp 0.002 - 0.037mb But the J/y is much easier to be detected by lepton channels than hc. Jiajun Wu Baryon’10

  20. The prediction for N*`bb Use Nucleon Pole replace N*`bb as background `pp ghb`pp 0.01—1nb Jiajun Wu Baryon’10

  21. Summary • In the low energy region, we analyze the pp collision data, predict some results for`pp collision. It is a very nice place to study N* with large coupling to Ns, such as N*(1440), in`pp collision. • We use Valencia model to predict some new N* with hidden charm and beauty, with large mass and narrow width. Some of them may be observed in the future PANDA experiment. If confirmed, they obviously can’t be explained in the 3q model. Jiajun Wu Baryon’10

  22. Thank you for your attention

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