Goals of future p-pbar experiment Elmaddin Guliyev Student Seminar, KVI, Groningen University 6 November 2008

Outline 1. History antiparticles production of antiparticles in accelerator 2. Low Energy Antiproton Ring experiment 3.Future p-pbar PANDA experiment

The history of antimatter begins in 1928 with a young physicist named Paul Dirac and a strange mathematical equation… Since 1930: search for the possible constituents of antimatter In 1932, first antimatter or antiparticles were discovered by Carl D.Anderson: the Positron

In the early 1980s, Simon van der Meer at CERN invented a technique that now made it possible to accumulate, concentrate and control antiproton beams. And in 1982 the Low Energy Antiproton Ring (LEAR) appeared: it could decelerate the antiprotons coming from the proton synchrotron to different intermediate energies, down to a few MeV.

Motivation of LEAR experiments: study antiproton – proton scattering search for meson resonances glueballs, hybrids. For LEAR operation a pulses of antiprotons with the 0.6 GeV/c momentum has been used Physics programme

Future experiments on p-p bar interaction PANDA experiment antiProton ANnihilations at DArmstadt

Goal of PANDA experiment: - study strong interaction in the regime of strong coupling - charmonium spectroscopy - search for glueballs and hybrids in the charmonium mass region - study single and double hypernuclei

Hadron Physics – tests of QCD

Hadron Spectroscopy

Charmonium - positronium of QCD confinement potential narrow states (e.m. decay) confinement potential narrow states (e.m. decay) data and interpretation above DD threshold not clear recently discovered narrow states data and interpretation above DD threshold not clear recently discovered narrow states

Charmonium - positronium of QCD New measurements published by e+e- experiments:  c

Belle, PRL91, (‘03) ’’ Belle X(3872) PRL 91 (2003) M B’s Charmonium - new frontiers What is the X(3872)?  Charmonium 1 3 D 2 state?  D 0 D 0 * molecule?  Charmonium hybrid (c c g)?

Charmonium - new frontiers X(3872), Belle 09’2003, 1 ++, χ c1 ´ or D 0 D* molecule –decays into J/ψπ + π -, J/ψπ + π - π 0, J/ψγ, D 0 D * Y(3940), Belle 09’2004, 2 3 P 1 or Hybrid? –decays into J/ψω Y(4260), BaBar 06’2005, 1 --, 2 3 D 1 (BaBar) or 4 3 S 1 (CLEO) or Hybrid –decays into e + e -, J/ψπ + π -, J/ψπ 0 π 0, J/ψ K + K - X(3943), Belle 07’2005, 0 -+, η c ´´ –decays into D 0 D * Z(3934), Belle 07’2005, 2 ++, χ c2 ´ –decays into γγ, DD ψ(4320), BaBar 06’2006, Hybrid

Open Charm Spectroscopy - D sJ D sJ spectroscopy: The analog of hydrogen atom D sJ spectroscopy: The analog of hydrogen atom * DsDs DsDs D sJ (2317) D sJ (2460) D sJ (2536) D sJ (2573 ) Striking discrepancies of recently discovered states (B factories, CLEO&BaBar) DK threshold effects? 4-q state? Striking discrepancies of recently discovered states (B factories, CLEO&BaBar) DK threshold effects? 4-q state? PANDA: near-threshold scan -> M,  PANDA: near-threshold scan -> M, 

e + e - versus pp annihilations e + e - reactions: only 1 -- states formed directly pp reactions: all states directly formed e + e - reactions: only 1 -- states formed directly pp reactions: all states directly formed MeV3510 CBall ev./2 MeV 100 E CM CBall E E 835 ev./pb  c1 Example: e + e - :  > 3.8 MeV pp:  = / MeV

Charmed Hybrids Lattice QCD: cc-hybrid M~ GeV exotic J PC = 1 -+ no cc mixing no decay DD/DD * Flux-tube model:  < 50 MeV pp:  ~ pb Lattice QCD: cc-hybrid M~ GeV exotic J PC = 1 -+ no cc mixing no decay DD/DD * Flux-tube model:  < 50 MeV pp:  ~ pb

G.S. Bali, Eur. Phys. J. A19 1 (2004) Glueballs Glueballs: the ultimate evidence for confinement… Glueballs: the ultimate evidence for confinement… Lattice QCD: rich glueball spectrum odd-balls ~4-5 GeV Lattice QCD: rich glueball spectrum odd-balls ~4-5 GeV

PANDA is a modular multi-purpose device: nearly 4  solid angle(partial wave analysis) high rate capability(2 · 10 7 annihilations/s) good PID( , e, , , K, p) momentum resolution(~1%) vertex info for D, K 0 S,  (c  = 317  m for D ± ) modular design(Hypernuclei experiments) Detector The PANDA Detector

solenoid (1 T)‏ dirc muon counter emc BEAM mvd tpc rich emc hadronc Target spectrometer Forward spectrometer PANDA detector

The PANDA barrel and forward endcap EMC

AntiProton Beam Proton (hydrogen gas) Interaction Point MicroVertex Detector

: the GSI future facility 5x GeV/c antiprotons Facility for Antiproton and Ion Research

Conclusion Strong interaction studied in the regime of strong coupling Hadron spectroscopy will be possible at high excitation energy Charmonium spectrum and transitions will be analysed We will search for exotic states: hybrid states, glue-balls 1.

Literature: 1. Burcham and Jobes, Nuclear and Particle Physics, 1995, England 2. Physics Performance Report for PANDA, August 2, 2008