1 / 28

Introduction

Introduction. FAIR Facility Status of the PANDA Detector Brief Overview of the Physics Program (exotic) Charmonium (exotic) Open Charm Summary. Facility for Antiproton and Ion Research. SIS18. SIS100. p- Linac. HESR. Antiprotons Production Target. CR/RESR.

dyami
Download Presentation

Introduction

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. Introduction • FAIR Facility • Status of the PANDA Detector • Brief Overview of the Physics Program • (exotic) Charmonium • (exotic) Open Charm • Summary

  2. Facilityfor Antiproton and Ion Research SIS18 SIS100 p-Linac HESR Antiprotons Production Target CR/RESR

  3. Facilityfor Antiproton and Ion Research Areal view July 27th, 2013

  4. HESR with PANDA and Electron Cooler 1010 - 1011 Antiprotons stored Thick target 4·1015 cm-2 Δp/p ≤ 4·10-5 Lumi up to 2·1032 cm-2s-1 Phase space cooling beam life time: > 30 min COSY HESR

  5. Electron Cooler, HESR Injection energies • HESR Injection energies (3.5 GeV/c) • 2 MV x 1 A • Installed in COSY in 2013

  6. PANDA Detector Scenario • High background: exclusive event reconstruction essential  simultaneous neutral and charged particles close to full 4p acceptance • Glueballs/Hybrids/etc.: high kaon yield  PID over full forward hemisphere • Resonances/Molecular states/etc.: concurrent measurement of different decay branches MVD and EMC • Electromagnetic final states: e+/- and m+/- EMC and Muon Detectors

  7. p Momentum [GeV/c] 0 2 4 6 8 10 12 15 ΛΛ ΣΣ ΞΞ ΩΩ DD ΛcΛc ΣcΣc ΞcΞc ΩcΩc DsDs qqqq ccqq nng,ssg ccg nng,ssg ccg ggg,gg ggg light qq π,ρ,ω,f2,K,K* cc J/ψ, ηc, χcJ 1 2 3 4 5 6 Mass [GeV/c2] PANDA Program • Meson spectroscopy • light mesons • charmonium • exotic states • glueballs • hybrids • molecules/multiquarks • open charm • Baryon/antibaryon production • Charm in nuclei • Strangeness physics • Hyperatoms • S = -2 nuclear system • Ξ− nuclei • ΛΛhyepernuclei • E.M. processes

  8. Hadron Spectroscopy with Antiproton Annihilation

  9. Why Antiprotons? • difficult to make • BUT: • gluon rich process • gain ~2 GeV in annihilation, reduced momentum transfer • all fermion-antifermion quantum numbers accessible • very high resolution in formation reactions • high angular momentum accessible

  10. c.f. Only JPC = 1-- allowed in e+e- (to 1st order) _ Particle production in pp collisions Formation: _ _ All JPC allowed for (qq) accessible in pp

  11. High Mass/Width Resolution, e.g.: χc1,2 • Invariant mass reconstruction depends • on the detector resolution ≈ 10 MeV Formation: Resonance scan: Resolution depends on the beam resolution E760@Fermilab ≈ 240 keV PANDA ≈ 50 keV

  12. Charmonium Spectroscopy _ • open questionsbelow DD thresholdwidths, branching • new „XYZ“ states (Belle, BaBar, CLEO, CDF, D0, LHCb…) • masses are poorly known; • often widths are just upper limits; • few final states have been studied; • statistics are poor; • quantum number assignment is possible for few states; • some resonances need confirmation… • newdegreesoffreedom: molecules, tetraquarks, gluonic excitations? • conventionalstatesabove DD • high Lstates: access in pp but not in e+e- _ _

  13. New Charmonium-like Discoveries in addition: many new open charm states

  14. _ Exotics production in pp collisions • Production: all JPC accessible Hybrids JPC exotic Exotic JPC would be clear signal G.Bali, EPJA 1 (2004) 1 (PS)

  15. How can PANDA contribute? ε = 32 % S/N = 2 • simulation studies for several channels and √s: • J/ψπ+π-,J/ψπ0π0, χcγJ/ψγγ, J/ψγ, J/ψη, ηcγ • direct formation in pp: line shapes ! • d target: pn with p spectator tagging, e.g. Z-(4430) _ _ C. Hanhartet al., PRD 76 (2007) 034007 E. Braaten, M. Lu, PRD 77 (2008) 014029 J/yp+p- _ _ _ D0D*0 D0D*0 D0D0p0 ≈ 100 events/day ≈ 40 events/day S/N =25 Compare lineshapes in different final states! J/yp+p-

  16. Open Charm: The DsSpectrum • Th./Expt. in qualitative agreement for D states, but some details open • Many new DJ mesons (LHCb) • new narrow states (2003): Ds*(2317) and Ds*(2460) , (and other broad states more recently) • masses significantly lower than quark model expectation, and just below DK and D*K threshold • Widths are only upper limits • Interpretation unclear: DK/D*K molecules, tetraquarks, chiral doublers, …? Sensitive to width

  17. Ds0*(2317) Theoretical Predictions Pure cs state Tetraquark state DK had. molecule Dynamically gen. res. DK had. molecule

  18. Method: Threshold Scan • reaction: • excitation function only depends on m and Γof Ds(2317) • experimental accuracy determined by beam quality (Δp, σp/p), not by detector resolution

  19. Simulation Results: Energy Scan Msum = Mmiss(Ds) + M(Ds) G = 100 keV

  20. Summary of MC Simulations Work in progress... Ds1'(2536)+ Ds0(2317)+ Ds1(2460)+ x100 x100 20% 16% 9% Ds+ D0 p0 30% 58% 60%

  21. Summary • Many charmonium and open charm states recently discovered • Nature of these states is not clear, for some it seems to be connected to the width • Pbar-P also sensitive to exotic JPC states • PANDA will be able to perform high resolution • Resonance scans and • Threshold scans • FAIR and PANDA progressing well towards realization

  22. Thank you for you attention and Goodbye to Nara

  23. The PANDA Collaboration ~500 Members from 67 Institutes 18 Countries Australia, Austria, Belarus, China, France, Germany, India, Italy, Poland, Romania, Russia, Spain, Sweden, Switzerland, Thailand, The Netherlands, USA, UK

More Related