1 / 28

production and B-decay from LHC to SPS

production and B-decay from LHC to SPS. Baoyi Chen Tsinghua University Superviser: Pengfei Zhuang Other cooperators: Yunpeng Liu, Kai Zhou. Tsinghua University Aug.9 2013. Outline. 1. Transport Model & Hydrodynamics

jadon
Download Presentation

production and B-decay from LHC to SPS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. production and B-decay from LHC to SPS Baoyi Chen Tsinghua University Superviser: Pengfei Zhuang Other cooperators: Yunpeng Liu, Kai Zhou Tsinghua University Aug.9 2013

  2. Outline 1. Transport Model & Hydrodynamics 2. Prompt charmonium (Transport Model) 3. Non-prompt charmonium (Included by Hand) 4. Comparison with data 5. Summary Tsinghua University Aug.9 2013

  3. Before going on What are we doing ? Double-Ratio (B.Chen, Y.Liu, K.Zhou, P.Zhuang, arXiv:1306.5032 ) Tsinghua University Aug.9 2013

  4. Transport Model Introduction Part one: (for prompt Jpsi) Classical transport equation is widely accepted to be a good approximation to discribe heavy quarkonium evolution in QGP dissociation term by gluon in QGP reproduced by ccbar pair charmonium distribution in phase space (Evolution of Charmonium Distribution) Tsinghua University Aug.9 2013

  5. Transport Model Introduction Its analytic solution is In order to solve the equation, we need initial distribution: ( shadowing, cronin effect, ... ) Tsinghua University Aug.9 2013

  6. Transport Model Introduction Part One: Part Two: Evolution of medium (QGP) 2+1 demensional boost invariant (Energy-momentum Conservation) With + EOS QGP: ideal gas with u,d,s quarks HG: ideal gas with hadrons and resonences with mass up to 2GeV. with repulsion parameter K, bag parameter B J. Sollfrank, et. Phys.Rev.C55, 392(1997) Tsinghua University Aug.9 2013

  7. Prompt Charmonium Calculation Double Ratio (Inclusive) Done ! (next page) There are inclusive and prompt charmonium double-ratio data at LHC and SPS, respectively Transport Model Directed produced Prompt Jpsi Decay from higher excited states Inclusive Jpsi Add by hand Non-prompt Jpsi Decay from B hadrons (contribute ~10%) Tsinghua University Aug.9 2013

  8. JPsi nuclear modification factor from Zhou Kai Different Rapidity Different Pt region Tsinghua University Aug.9 2013

  9. Non-prompt charmonium manipulation ? How to include the non-prompt part toinclusive yield :number of non-prompt from B-decay in certain Pt regioninpp collisions depends on Pt :quenched factor of b quark :fraction of non-prompt to prompt Tsinghua University Aug.9 2013

  10. Input One: non-prompt fraction in pp Fitting non-prompt fraction in pp collisions fraction Different B-decay contribution fraction in different Pt region f(pt) error-bar Tsinghua University Aug.9 2013

  11. Input One: non-prompt fraction in pp 1.96TeV pp collisions f(pt) Different B-decay contribution fraction in different Pt region error-bar Tsinghua University Aug.9 2013

  12. Input Two: hot-medium effect b-quark quenched factor Q Hot-medium effect: Quenched factor Q high Pt (experimental data, ~0.35) limit: 0.28 ~ 0.45 middle Pt (simple approx. ~1.0 ) low Pt (simp. approx. ~1.4) Tsinghua University Aug.9 2013

  13. Non-prompt charmonium manipulation f_B and Q, ( exp. data, & simple approx. ) prompt RAA, ( Transport Model) Getting Double Ratio = Let's give some numerical data Tsinghua University Aug.9 2013

  14. Comparision with Experimental Data high Pt Increase with Np 1.Tend: Decrease 2.Magnitidue: Inclusive is much larger than prompt All from exp. data Reliable ! Tsinghua University Aug.9 2013

  15. Comparision with Experimental Data middle Pt explain reasonably well Inclusive Prompt physical guess Tsinghua University Aug.9 2013

  16. Comparision with Experimental Data low Pt Explain well exp. data at high,middle,low Ptregion, even with simply handling non-prompt charmonium Inclusive Prompt physical guess Tsinghua University Aug.9 2013

  17. Transverse momentum drops down: prompt dorminate ( init V.S. rege. ) is flat: non-prompt dorminate ( Quench factor Qindependent of Np in central and semi-central centrality ) Tsinghua University Aug.9 2013

  18. SPS Data Also, Prompt charmonium data is explained at SPS Prompt Tsinghua University Aug.9 2013

  19. Prediction at RHIC Prediction at RHIC : Inclusive Prompt Tsinghua University Aug.9 2013

  20. Summary With transport model, we study the prompt charmonium, and include B-decaycontribution forJPsiandPsi(2S), 1.Inclusive Psi(2S) yield: Including the non-prompt contribution, We explain LHC data well atHigh, Middle, Lowtransverse momentum region. 2.InclusivePsi(2S) transverse momentum: Inclusive Psi(2S) transverse momentum ratio is flat; but inclusive Jpsi drops down in central and semi-central centrality. Both of these are due to Different source Jpsi inclusive yield is dorminated byprompt part; Psi(2S) inclusive yield is dorminated by non-prompt part (B-decay) Tsinghua University Aug.9 2013

  21. Summary Thank you very much Tsinghua University Aug.9 2013

  22. Buckup Tsinghua University 2013. 4. 26

  23. Comparision with Experimental Data But with an exception ! Prompt JPsi: √ Limit of Double-Ratio: shift all b-quark to this pt region, gives Q(max)=2.3 Inclusive Prompt ( limit ) So, even with max B-decay, the up-limit is only 1.3 (exp.) Tsinghua University Aug.9 2013

  24. Non-prompt charmonium manipulation Prompt part: calculated by Our transport model. Non-prompt Part: included by parameters Prompt charmonium: Transport model has been successfull at SPS, RHIC, LHC; for charmonium, Upsilon; for total yields, transverse momentum, elliptic flow..... PLB:607,107 PLB:697,32 PRC:86,034906 Non-prompt charmonium: We fix the params with exp. data below ! Tsinghua University Aug.9 2013

  25. Comparision with Experimental Data Little summary At LHC, Jpsi and Psi(2S) production mechanism is different: Psi(2S) production is dominated by non-prompt part. and Jpsi is by the prompt part. shows more clearly the big difference of their production mechanism: Jpsi drops down, due to competition: Psi(2S) is flat, due to quench factor is almost const. in central and semicentral centrality. init. V.S. rege. prompt non-prompt Tsinghua University Aug.9 2013

  26. Inclusive Jpsi Give estimates of some Limits: Q: quench factor of b quark So, inclusive RAA should between RAA(prompt) and Quench Factor Tsinghua University 2012.12.21

  27. Double Ratio: (Pt: 0-3 GeV/c ) Tsinghua University 2012.12.21

  28. Double Ratio: (Pt: 3-30 GeV/c ) Tsinghua University 2012.12.21

More Related