Hadron Physics with Antiprotons

1
Hadron Physics with Antiprotons
? Overview ? Physics with Antiprotons
_at_ PANDA (see J. Ritman, U. Wiedner)
Hadron Spectroscopy Properties of Hadrons in
Matter Double ?-Hypernuclei Options
? Conclusions
2
Overview on p-induced Reactions
3
(No Transcript)
4
(No Transcript)
5
Hadron Spectroscopy
Naive Quark Model Mesons (Resonances)
qq-states Baryons (Resonances) qqq-states
Particular states cc Charmonium (QCD-analog
to ee-Positronium states) LQCD Model
calculations Existence of exotic states
6
Charmonium the Positronium of QCD
Charmonium
Positronium
7
cc(g) - Lattice Predictions
42 K. Juge, J. Kuti, and C. Morningstar, Phys.
Rev. Lett. 90, 161601 (2003).
8
Glueballs

• Self interaction between gluons
• Construction of color-neutral
• hadrons with gluons possible
• exotic glueballs dont mix with
• mesons (qq)
• 0--, 0-, 1-, 2-, 3-, ...

9
PANDA Hadron Spectroscopy Program
Mass range
10
PANDA Hadron Spectroscopy Program
Experiments cc
?c (11S0) experimental error on M gt 1 MeV ?
hard to understand in simple quark models ?c
(21S0) Crystal Ball result way off study of
hadronic decays hc(1P1) Spin dependence of QQ
potential Compare to triplet P-States LQCD ??
NRQCD States above the DD threshold Higher
vector states not confirmed ?(3S), ?(4S)
Expected location of 1st radial excitation of P
wave statesExpected location of narrow D wave
states, only ?(3770) seenSensitive to long range
Spin-dependent potential Nature of the new
X(3872)/ X(3940), Y(3940) and Z(3940)
11
PANDA Hadron Spectroscopy Program
Example Ground State
Decay modes ??, ???
12
PANDA Hadron Spectroscopy Program
Glueballs (gg)
Predictions Masses 1.5-5.0 GeV/c2 (Ground
state found? Candidates for further
states?) Quantum numbers Several spin exotics
(oddballs), e.g. JPC 2- (4.3 GeV/c2 ) Widths
100 MeV/c2 Decay into two lighter glueballs
often forbidden because of q.-n. No mixing
effects for oddballs
Decays ??, ??, ??
13
PANDA Hadron Spectroscopy Program
Open Charm States
New observations

• The DS spectrum csgt c.c. was not expected to
  reveal any surprises, but ...
• Potential model
• Old measurements
• New observations
• (BaBar, CLEO-c, Belle)
• Or these are molecules?

14
Merits of Antiprotons (1)
Resolution of the mass and width is only limited
by the (excellent) beam momentum resolution
15
Merits of Antiprotons (2)
16
High Resolution of M and G
?Crystal Ball typical resolution 10
MeV ?Fermilab 240 keV ?PANDA 20 keV
? ?p/p 10-5 needed
17
Merits of Antiprotons (3)
pp-cross sections high ? Data with very high
statisties
Example pp ? ?0?0?0 (LEAR) ? f0(1500) best
candidate for Glueball ground state
Low final state multiplicities Clean spectra,
Good for PWA analyses
18
Merits of Antiprotons (4)
High probability for production of exotic states
19
Properties of Hadrons in Matter
Mass splittings because charge conjugation
symmetry broken at nB ? 0 Overall attraction of
Kaons due to scalar interaction KN sigma
term Mass splitting due to vector interaction
Weinberg-Tomozawa
20
J/?, ? Absorption in Nuclei
21
Douple ?-Hypernuclei
22
Timelike Proton Form Factors at large Q2
The time like FF remains about a factor 2 above
the space like. These differences should vanish
in pQCD, thus the asymptotic behavior has not yet
been reached at these large values of q2.
(HESR up to s 25 GeV2) (PANDA probably up to
20 GeV2)
q2gt0
q2lt0
23
Physics Program / Further Options
Baryon Spectroscopy New states, Quantum numbers
and decay rates
24
Physics Program / Further Options
25
Physics Program / Further Options
Study of reversed Deeply Virtual Compton
Scattering (DVCS) ? Nucleon
structure functions
26
Conclusions
? Enormous impact in particle physics of
p-induced reactions ? p-induced reactions
have unique features Nearly all states can be
directly produced High cross sections
guarantee high statistics data ? p-beams
can be cooled very effectively ? The
planned p-experiments at FAIR will contribute to
a further understanding of the
non-perturbative sector of QCD
27
Charmonium Production in pp
for selected decay mode
L 2x1032 cm2s1, 50 accelerator and
detector efficiency, integrated luminosity 8
pb1/day
1 B.R. for this decay mode
28
QCD-Vacuum as function of p and T
29
HESR / PANDA
Production Rates (1-2 (fb)-1/y)
Final State
cross section
reconstr. events/y
Common Feature Low multiplicity events
Moderate particle
energies For Pairs Charge symmetric conditions
Trigger on one, investigate the
other
30
Charmonium Physics
DsJDsJ
Most states above DD not measured
Are ?(4040) and ?(4160) strong mixtures of the
?(3S) and hybrid charmonium states or ?(4040) is
DD-molecule?
?(43S1)
?(33S1)
DD
X(3872)
DD
?(13D1)
DD
?c(21S0)
Is the narrow X(3872) state D0D molecule?
Measure decay branching ratios.
?c(11S0)
31
Threshold production of DsJ(2317)

• Depend on internal structure
• the width of DsJ can be different
• Current limit ? 4.9 MeV
• ?-doubling ? 10 keV
• Phenomenological ? 130 keV
• DsK molecules ? 200 keV

32
Crypto-exotic Baryons with Charm ?

• J.Hofmann M.Lutz hep-ph/0507071
• Many Narrow Resonances
• Decays to ?? N

33
HESR High Energy Storage Ring
Beam Momentum 1.5 - 15 GeV/c High Intensity
Mode Luminosity 2x1032 cm-2s-1
(2x107Hz) dp/p (st. cooling) 10-4 High
Resolution Mode Luminosity 2x1031 cm-2s-1
dp/p (e- cooling) 10-5