PANDA physics with the use of antiproton beam

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


HESR

June 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


PANDA DETECTOR TRACKING

June 2013


PANDA DETECTOR IDENTIFICATION

June 2013


PANDA DETECTOR CALORIMETRY

June 2013


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

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Talk

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


PANDA ADVANTAGES: POSSIBILITY TO CREATE ALL STATES

20.09.2012


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 MeVpp Fermilab: 240 keVpp PANDA: ~30-100 keV

WIDTH MEASUREMENT ACCURACY

20.09.2012V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM


LATTICE QCD CALCULATIONS 2012

June 2013

lightest supermultiplet

first excited supermultiplet

other states (cc)

L. Liu et al, arXiv: 1204.5425v1 [hep-ph]


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


PDG 2012 STATES

June 2013


Conventional states: masses and width of ηc

June 2013

Data from Xiaoyan SHEN Talk at PANDA-meeting


Conventional states: hc width

June 2013


PDG 2012 CHARMONIUM STATES

June 2013


X(3872)

June 2013


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


• 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


X(3872) SCAN

June 2013


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.


• 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)



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


PRODUCTION OF EXOTIC CHARMONIUM HYBRID

June 2013


OPEN CHARM

June 2013


OPEN CHARM IN PANDA(2317)

June 2013

V. MOCHALOV, SPIN-2012, IHEP SPIN PROGRAM 3120.09.2012


DS*(2317) THRESHOLD SCAN

20.09.2012


“LIGHT SECTOR” EXOTICS

June 2013


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 !!!


LQCD GLUEBALL SPECTRUM

June 2013

lightest NARROW (50VeV)oddballs above open charm thresholdm(2+-) ~ 4230 MeVm(0+-) ~ 4780 MeV


ANTIHYPERON-HYPERON PRODUCTION

June 2013


PAIR HYPERON PRODUCTION

June 2013

Almost full symmetry for the particles an anti-particles gives unique possibility to measure CP effects minimizing systematics


BARYON SPECTROSCOPY (ERIK THOMÉ PHD)

June 2013


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


POLARIZATION STUDY IN



STUDY OF

June 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


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


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.


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|





NEED TO ADD DETECTOR SUBSYSTEMS IN BACKUP

June 2013

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PANDA physics with the use of antiproton beam