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V. Mochalov (IHEP, Protvino)
on behalf of the PANDA collaboration
PANDA PHYSICS WITH THE USE OF ANTIPROTON
BEAM
V. MOCHALOV, HADRON STRUCTURE 2013 2
CONTENT
June 2013
Introduction: FAIR, HESR & PANDA
(FAIR – Facility for Antiproton and Ion Research)
(HESR – High Energy Storage Ring)
(PANDA– antiProton ANnihilation at DArmstadt)
PANDA Detector
Hadron Physics
Charmonium
Open charm
Light exotics
Baryon studies
Conclusion
V. MOCHALOV, HADRON STRUCTURE 2013 3June 2013
•100m
•pbar production :•proton Linac 50 MeV•accelerate p in SIS18/SIS100•produce pbar on target•collect pbar in CR,•cool in RESR (not in Start Version)•inject pbar into HESR
V. MOCHALOV, HADRON STRUCTURE 2013 4
HESR
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 5June 2013
antiProton ANnihilation at DArmstadt
• A very high intensity beam with momentum from 1.5 GeV/c up to15 GeV/c on a proton fixed target (or nuclear target), average interaction rate 20 MHz, s from 2.25 up to 5.46 GeV
• It will continue and extend the successful physics program performed in the past at facilities like LEAR at CERN and the antiproton accumulator ring at FNAL
V. MOCHALOV, HADRON STRUCTURE 2013 6
PANDA DETECTOR TRACKING
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 7
PANDA DETECTOR IDENTIFICATION
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 8
PANDA DETECTOR CALORIMETRY
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 9
PANDA DETECTOR CHARCTERISTICS
June 2013
• Capability to detect events with high rate (up to 2 · 107 s-1 interactions)
• Nearly 4π solid angle for large acceptance and PWA
• p±, K±, p±, e±, μ±, γ identification
• Displaced vertex detection – vertex information for D, KS, , (c = 317 m for D±)
• Photon detection from 10 MeV to 10 GeV
• Efficient event selection & good momentum resolution
Detector will be described in the Marco Destefanis Talk
10V. MOCHALOV, HADRON STRUCTURE 2013
• Hadron spectroscopy
• light mesons
• charmonium and open charm
• search for exotics
• baryons (double strange, charmed)
• baryon anti-baryon production
• Mesons in nuclei
• Hypernuclei
• EMP processes
• Time-like electromagnetic form factors of the proton,
• Transverse quark distributions
PANDA PHYSICS OVERVIEW
June 2013V. MOCHALOV, HADRON STRUCTURE 2013
will
be
desc
ribed
in th
e M
arco
Dest
efan
is T
alk
V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM 11
Update on the Physics Perspectives of PANDA• Spectroscopy of X, Y and
Z states
• Nucleon Structure from electromagnetic processes in PANDA
• Physics of doubly strange systems
• Production of S=-2 systems at FAIR
PANDA PHYSICS DOCUMENTS
20.09.2012
V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM 12
PANDA ADVANTAGES: POSSIBILITY TO CREATE ALL STATES
20.09.2012
13V. MOCHALOV, HADRON STRUCTURE 2013
In the formation mode, masses and widths will be measured very accurately. It depends only on the beam parameters, not on the detector resolution, which determines only be the sensitivity to a given final state
• Typical resolution:
e+e- Crystal Ball: ~ 10 MeV
pp Fermilab: 240 keV
pp PANDA: ~30-100 keV
WIDTH MEASUREMENT ACCURACY
20.09.2012V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM
V. MOCHALOV, HADRON STRUCTURE 2013 14
LATTICE QCD CALCULATIONS 2012
June 2013
lightest supermultiplet
first excited supermultiplet
other states (cc)
L. Liu et al, arXiv: 1204.5425v1 [hep-ph]
V. MOCHALOV, HADRON STRUCTURE 2013 15
CHARMONIUM SPECTROSCOPY
June 2013
All charmonium states below open charm threshold observed All charmonium 1-- states observed
Above open charm threshold: • many expected states not observed • many unexpected observed
V. MOCHALOV, HADRON STRUCTURE 2013 16
PDG 2012 STATES
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 17
Conventional states: masses and width of ηc
June 2013
Data from Xiaoyan SHEN Talk at PANDA-meeting
V. MOCHALOV, HADRON STRUCTURE 2013 18
Conventional states: hc width
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 19
PDG 2012 CHARMONIUM STATES
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 20
X(3872)
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 21
X(3872) DISCUSSION
June 2013
• Breaks isospin in the decays J/(->+ −) – isospin violation, J/(->+ − 0) → it is not charmonium?
• Within m < 1 MeV of the DD* threshold S-wave molecular state?
• Large cross-section – it is charmonium χc1(2P)?- (S.S. Gershtein, A.K. Likhoded, A.V. Luchinsky Phys.Rev. D74 (2006) 016002) - For molecule should be lower by factor 10^2)
• Probably two narrow states (CDF)
• Charge partner? – not in the mass window neither in width
V. MOCHALOV, HADRON STRUCTURE 2013 22June 2013
• X(3872) may be a mixture of usual charmonia χc1(2P)-calculated and molecule DD*
( ) + χ_c1(2P) it is desireable to find mechanism to suppress χ_c1(2P) production.
• X(4260) and X(3872) have the same nature? BESIII found (?) radiation decay
V. MOCHALOV, HADRON STRUCTURE 2013 23
X(3872) SCAN
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 24
X(3872) PUZZLE
June 2013
The mass value of M = 3871.68 ± 0.17 MeV is .05±0.27 MeV lower than the sum of masses of the D0 and D*0
PANDA will measure width at the level of 0.1 MeV with 20 keV accuracy.
25V. MOCHALOV, HADRON STRUCTURE 2013
• Can not be charmonium (charged)
• it must contain a cc-bar pair due to its decay into ψ’π+.
• decay into J/ψπ+ is not observed
• Other states (3900)
• 4025(?)
Z(4430) STUDY (AND OTHERS)
June 2013V. MOCHALOV, HADRON STRUCTURE 2013
26V. MOCHALOV, HADRON STRUCTURE 2013
Z(4430) AT PANDA
June 2013
The ψ(2S)π Dalitz plot for the reaction with Z decaying into ψ(2S)π
The ψ(2S)π invariant mass (blue). Combinatorics background in red
27
SEARCH FOR Z(4430) PARTNERS
June 2013
• PANDA can investigate the Z+(4430) even further by switching to studies of the Z+(4430) in formation mode.
• Due to the charge of the Z, this is only possible by annihilating the antiprotons on a neutron in a deuterium target. Experimentally it is no problem to replace the hydrogen gas, for example in a pellet target, with deuterium. The reaction to look for in would then be:
With decay
V. MOCHALOV, HADRON STRUCTURE 2013 28
PRODUCTION OF EXOTIC CHARMONIUM HYBRID
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 29
OPEN CHARM
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 30
OPEN CHARM IN PANDA(2317)
June 2013
V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM 3120.09.2012
V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM 32
DS*(2317) THRESHOLD SCAN
20.09.2012
V. MOCHALOV, HADRON STRUCTURE 2013 33
“LIGHT SECTOR” EXOTICS
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 34
STUDY OF EXOTICS INCLUDING PWA
June 2013
• Study of channel: J/ψ → ϕϕγ → (K+K-) (K+K-) γ
• Large isospin breaking: η(1440) and f0(980) showed incompability BESIII: PRL 108 (2012) 182001
But !!!
35V. MOCHALOV, HADRON STRUCTURE 2013
LQCD GLUEBALL SPECTRUM
June 2013
lightest NARROW (50VeV)oddballs above open charm thresholdm(2+-) ~ 4230 MeVm(0+-) ~ 4780 MeV
V. MOCHALOV, HADRON STRUCTURE 2013 36
ANTIHYPERON-HYPERON PRODUCTION
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 37
PAIR HYPERON PRODUCTION
June 2013
Almost full symmetry for the particles an anti-particles gives unique possibility to measure CP effects minimizing systematics
V. MOCHALOV, HADRON STRUCTURE 2013 38
BARYON SPECTROSCOPY (ERIK THOMÉ PHD)
June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 39
HYPERON SPIN PROPERTIES
June 2013
• Measurement of spin observables – spin density matrix (polarization) an correlation parameters
• CP violation
• In decay width Γ(Y→Bπ) and conjugate decay Γ(¯Y → ¯Bπ)
• Much more with polarization:
• the asymmetry parameter α quantifies
the tendency of the decay baryon to be
preferably emitted in the hyperon spin direction
• With hyperon decay to another decay
additional CP asymmetries can be achieved
40V. MOCHALOV, HADRON STRUCTURE 2013
POLARIZATION STUDY IN
June 2013V. MOCHALOV, HADRON STRUCTURE 2013
41V. MOCHALOV, HADRON STRUCTURE 2013
STUDY OF
June 2013
42V. MOCHALOV, HADRON STRUCTURE 2013
CP ASYMMETRY AND STATISTICS
June 2013
43
OTHER PHYSICS
June 2013
• Nucleon Structure from electromagnetic processes
• The extension of form factor measurements to the so called time-like region separating the magnetic and electric components can be performed with an order of magnitude improvement
• clean identification of dileptons can be used to measure a whole series of other electromagnetic processes like for example Drell-Yan in order to get access to the transverse spin structure functions.
• Study hyper-nuclei (including - double) and charm-nuclei, when the strange (one or two) or charmed particle "implanted" into the nuclei instead of the usual nucleon
• Hadrons in nuclear matter
• These items will be reported tomorrow by Marco Destefanis
V. MOCHALOV, HADRON STRUCTURE 2013 44
PANDA AT NUPECC COMMUNITY
June 2013
• The long-range plan of NUPECC for the European hadron physics community of the year 2010 identifies three major areas in hadron physics as prime goals for the future. Those are:
• ‘Hadron Spectroscopy’
• ‘Hadron Structure’ and
• ‘Hadronic Interactions’.
• The PANDA experiment by design can contribute to all of these
V. MOCHALOV, HADRON STRUCTURE 2013 45
CONCLUSIONS
June 2013
• The PANDA experiment will have a great potential for discovery in addition to the LHC at a relatively high-energy antiprotons and, at the same time, due to the energy scan mode will determine masses and widths of the resonances with an accuracy of a linear collider.
• In addition to high-intensity (up to 2х107 interactions), beam of antiprotons would be unprecedented in the degree of monochromatic, the expected level of p/p down to 10-5 , which will allow the study of strong interactions with high precision.
• PANDA detector is created using the most modern technology and provides a registration and identification of neutral and charged particles to nearly the full solid angle and energy range up to 15 GeV.
• A commissioning of PANDA and the first data taking is planned for 2018.
V. MOCHALOV, HADRON STRUCTURE 2013 46June 2013
Whole PANDA collaboration is grateful Organizers to give the possibility to present two Talks at the conference
BACKUP SLIDES
V. MOCHALOV, HADRON STRUCTURE 2013
ТОЧНОСТИ ИЗМЕРЕНИЯ ФОРМ-ФАКТОРА
Мировые данные на форм-фактор |GM|
Ожидаемые точности измерений отношения R=|GE|/|GM|
V. MOCHALOV, HADRON STRUCTURE 2013 49June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 50June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 51June 2013
V. MOCHALOV, HADRON STRUCTURE 2013 52
NEED TO ADD DETECTOR SUBSYSTEMS IN BACKUP
June 2013