Exotic and non-Exotic Charmonium Spectroscopy with FAIR Klaus Peters on behalf of the PANDA Collaboration GSI and U Frankfurt TU Munich, Oct 11, 2012

criteria of stability can be derived from extreme (exotic) structures  properties of the binding sub nuclear material research…. Klaus Peters - Charmonium Spectrscopy at PANDA

J PC L=0L= ψ(4415) ψ(4040) ψ(2S) J/ψ hchc χ c0 χ c1 χ c2 (2P) χ c2 ηcηc η c (2S) P,D,F,... States high angular momentum S-States η c (nS) ψ(nS) radial excitations Charmonium G. Bali et al., hep-lat/ Distance (fm) Klaus Peters - Charmonium Spectrscopy at PANDA

J PC L=0L= ψ(4415) ψ(4040) ψ(2S) J/ψ hchc χ c0 χ c1 χ c2 (2P) χ c2 ηcηc η c (2S) K.J. Juge, J. Kuti, C. Morningstar hep/lat Charmonium – different degrees of freedom ? Distance (fm) Klaus Peters - Charmonium Spectrscopy at PANDA different potential

J PC L=0L= ψ(4415) ψ(4040) ψ(2S) J/ψ hchc χ c0 χ c1 χ c2 (2P) χ c2 ηcηc η c (2S) K.J. Juge, J. Kuti, C. Morningstar hep/lat Charmonium – Hybrid potentials Distance (fm) Klaus Peters - Charmonium Spectrscopy at PANDA different potential

Discovery of the X(3872) hep-ex/ σ 11.6 σ BABAR Phys. Rev. Lett. 91(2003) Mill. BB Klaus Peters - Charmonium Spectrscopy at PANDA 2003

X(3872) – More complicated components ? D 0 D *0 cusppeak D + D *- D 0 D *0 Scan with simultaneous extraction of J/ψππ, D 0 D *0, D + D *-, ψ(2S)γ, J/ψγ, J/ψρ and J/ψω essential ! virtual state binding state J/ψππ needs a line shape measurement Klaus Peters - Charmonium Spectrscopy at PANDA

Glueballs in lattice QCD Klaus Peters - Charmonium Spectrscopy at PANDA Quenched Approximation no quark-pair creation typical lattice problems creates bare states Prediction: M(J PC =0 ++ )~ GeV/c 2 M(J PC =0 ++ )~ GeV/c 2 Morningstar und Peardon, PRD60 (1999) Morningstar und Peardon, PRD56 (1997) 4043

f 0 (1500) High production yield  f 0 (1500)π ~25 % in 3π 0 and in 2ηπ 0 Several scalar resonances in the same regime  indicate overpopulation  and also suggest strong mixing  glueball confirmation in the scalar sector still pending Klaus Peters - Charmonium Spectrscopy at PANDA

Fock-Expansion Mixing is present all over the place non- q states expected to contribute to the meson wave function exotics can (and will) mix with conventional q states with identical quantum numbers M HM M G Klaus Peters - Charmonium Spectrscopy at PANDA

Fock-Expansion – solution to the problem remove the leading term due to selection of quantum numbers e.g. for hybrids Klaus Peters - Charmonium Spectrscopy at PANDA

Fock-Expansion – solution to the problem remove the leading term due to selection of quantum numbers e.g. for hybrids Klaus Peters - Charmonium Spectrscopy at PANDA S1S1 S2S2 S=S 1 +S 2 J=L+S P=(-1) L+1 C=(-1) L+S L GluonMagneticElectric 1 S 0, 0 – –– 3 S 1, 1 –– – – –+ impossible for qq J PC exotic

π 1 (1600)…E852 ρπ in 1997 and COMPASS today π - p π - ρ 0 p π - π - π + p Klaus Peters - Charmonium Spectrscopy at PANDA

π 1 (1600)…E852 ρπ in 1997 and COMPASS today π - p π - ρ 0 p π - π - π + p Klaus Peters - Charmonium Spectrscopy at PANDA thanks to G. Adams, RPI

New Charmonium-like Discoveries X(3872) PRL 91, (2003) X(3940) PRL 98, (2007) Y(3940) PRL 94, (2005) X(3915) PRL 104, (2010) Y(4260) PRL 95, (2005) Y(4350) PRL 98, (2007) Y(4008) PRL 99, (2007) Y(4660) PRL 99, (2007) Z(4430) - PRL 100, (2008) Z 1 - & Z 2 - PRD 78, (2008) Y(4140) PRL 102, (2009) X(4350) PRL 104, (2010) Klaus Peters - Charmonium Spectrscopy at PANDA in addition to many more open charm states

Hybrid Candidates with J PC = 1 -- e + e -  J/ψ ππ  ISR mass4259±8MeV/c 2 width88±23MeV/c 2 charmonium hybrid ? ππ S-Wave L=0 S-Wave hybrid properties + Y(4260) Klaus Peters - Charmonium Spectrscopy at PANDA

Hybrid Candidates with J PC = 1 -- e + e -  J/ψ ππ  ISR mass4259±8MeV/c 2 width88±23MeV/c 2 charmonium hybrid ? Significance ~ 5.8σ PRD 74 (2006) Significance ~ 8σ PRL 95, (2005) e + e -  ф ππ  ISR mass2175±10MeV/c 2 width58±16MeV/c 2 strangeonium hybrid ? S-Wave Y(4260) Y(2175) Klaus Peters - Charmonium Spectrscopy at PANDA

….and FAIR PANDA HESR Klaus Peters - Charmonium Spectrscopy at PANDA

HESR – Storage Ring for Antiprotons Parameters of HESR Injection of p at 3.7 GeV Slow synchrotron ( GeV/c) Storage ring for internal target operation Luminosity up to L~ 2x10 32 cm -2 s -1 Beam cooling (stochastic & electron) E CM Resonance scan Energy resolution ~50 keV Tune E CM to probe resonance Get precise mass and width

Klaus Peters - Charmonium Spectrscopy at PANDA pp cross sections PANDA Crystal BarrelE760/E835 Obelix PS185 Jetset CITATION: W.-M. Yao et al., J. Phys. G 33,1 (2006)

Klaus Peters - Charmonium Spectrscopy at PANDA pp cross sections – exclusive final states 100 mb 10 mb 1 mb 100 μ b 10 μ b 1 μ b 100 nb 10 nb 1 nb ηcηc χ c0 χ c2 ηcπ0ηcπ0 Hybrids Glueballs X (3872) Example X (3872) peak ~50 nb (E. Braaten) DDπ/ψππ ~10:1  ψππ 250 pb (ee and μμ)  DDπ 500 pb (multiple channels) includes eff. and BR L=2·10 31, duty ε=0.5 ∫ (L*ε) = 0.86 pb -1 /d  2 d/point  peak (~400 ev. ψππ/~800 ev. DDπ) x 20 points  40 days Klaus Peters - Exotic PANDA

PANDA Detector Klaus Peters - Charmonium Spectrscopy at PANDA

X(3872) - Simulation of an Energy Scan Extraction of the Width after beam profile deconvolution Г = 136 keVГ = 100 keV 16 Scan-Points ΔE = 100 keV 2-3 days per Scan-Point

Klaus Peters - Charmonium Spectrscopy at PANDA Mass and Width Determination D sJ (*) (2xxx) Deduce mass and width from excitation function Many channels, but all require e-cooling at large energies threshold D s0 *D s0 *threshold D s D s0 * possible experimental result

Klaus Peters - Charmonium Spectrscopy at PANDA Benchmark pp  (χ c1 ππ)η and (DD * +c.c. )η (χ c1 ππ)η  not yet final (DD * +c.c. )η  1 nb production cross section  decay branchings already accounted for 100% 30% 13% Efficiency 8% Efficiency 5%

Klaus Peters - Charmonium Spectrscopy at PANDA Benchmark pp  Y(4260)  ψππ J/ψ J/ψππ J/ψπ 0 π 0

Klaus Peters - Charmonium Spectrscopy at PANDA Benchmark pp  фф Input  M=2.235 GeV/c 2  Г=15 MeV/c 2

strong and international collaboration > 400 scientists almost 60 Institutions Klaus Peters - Charmonium Spectrscopy at PANDA

Conclusion and Outlook Klaus Peters - Charmonium Spectrscopy at PANDA Hadron Physics at FAIR with PANDA  addresses key questions  high Statistics  high Precision  high Discovery potential R&D for PANDA well under way  edge technology  radiation hardness  speed – detectors and readout For a timely construction after the official start 2018

Klaus Peters - Charmonium Spectrscopy at PANDA THANK YOU

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