Journée Thématique IPN Orsay, 2004 PANDA, a new detector for hadronic physics at GSI (FAIR) Carsten Schwarz, GSI ● The FAIR facility HESR Storage ring

Journée Thématique IPN Orsay, 2004

PANDA, a new detector forhadronic physics at GSI (FAIR)

Carsten Schwarz, GSI

●The FAIR facilityoHESR Storage ring for antiprotons

●Research with antiprotonsoScientific goalsoPANDA Detector


Existing Facility (GSI)

Existing facility:UNILAC < 20 MeV/uSIS < 1-2 GeV/uESR < 0.8 GeV/u


Facility for Antiproton and Ion Research FAIR

New facility:July 2002: positively evaluated by German Science Council

Feb 2003: positive decisionof BMBF (Ministry of Education & Research)

April 2004: 2nd call for LOIs

June 2004: Presentation of LOIsto International Steering committee(ISC-FAIR)

key tech. Features:

●cooled beams

●rapidly cycling superconducting magnets


Facility for Antiproton and Ion Research FAIR

Primary beams:1012 1.5 GeV/u 238U28+

Factor 100-1000 over present in intensity

2-4 1013/s 30 GeV protons

1010/s 25-35 GeV/u 238U73+


New Facility

Secondary Beams:Broad range of radioactive beams up to 1.5-2 GeV/uup to factor 10000 in intensityover present

Antiprotons 3(0) - 30 GeV1-2 107 /s

Storage and Cooler Rings:1011 stored and cooled0.8-15 GeV antiprotons

Radioactive beamse-A collider


High Energy Storage Ring for antiprotons

ElectroncoolerE<8 GeV

Detector

Injection

HESR

High resol. Mode: L = 1031 cm-2 s-1 p/p < 10-5

High lum. Mode: L = 2·1032 cm-2 s-1 p/p < 10-4

Cooling: electron/stochasticPmax = 15 GeV/cLmax = 2·1032 cm-2 s-1

Ø < 100 mp/p < 10-5

internal target

Characteristics

70 m

185

m


Scientific goals for p

Medium modificationsof D mesons and J/ in nuclei

Charmonium spectroscopy

Hybrids & Glueballs

CP violation

Hypernuclei


Medium modifications of D and J/

pionic atoms

KAOS/FOPI

HESR

K

D

Vacuum nuclear medium= 0

+

-

K-

K+

D+

D-

25 MeV

100 MeV

50 MeV ?

Mass modifications of mesons

Continuation of present GSI physicsFOPI, KAOS, HADES, PANDA

Signal: medium modification ofproduction threshold,resonance widthe.g. ',

c2

Absorption cross section of J/ in nuclei (= 0).

PANDA



Hayashigaki, Phys. Lett. B487 (2000) 96

●Mass of cc expected to change only little

●Lowering of D masses change widths of Charmonium states close to threshold

● (1D) : = 24 MeV

● (2S) : = 0.28 MeV● experiment:

● (1D) lepton pair spectroscopy (e+e-:

i=10-5)

● widths and yield of cc DD



The expected signal:

●strong enhancement of the D meson crossection near threshold

●density () and temperature (T=0) is known

complementary to AA collisions

A.Sibirtsev, K. Tsushima, A.W. Thomas: Eur. Phys. J. A6 (1999) 351



● Charmonium gives information about QCD confinement potential.

● Many states are still missing.● pp: direct population of all states.● HESR allows investigation of states above

DD threshold.● Cooled beams with p/p=10-5 allow high

precision scan of resonances.

3500 3520 MeV3510

CB

all

ev./

2 M

eV

100

ECM

CBallE835

1000

E 8

35

ev./

pb

c1



Even on the ground state on the simplest parameters there are consistency problems

Five new measurements published 2002-2003,four by e+e- experiments



3580 3600 3620 3640 3660 3680

CBALL 86(2S)→X

'c

3637.7±4.4 MeV

BELLE 02B→K (KSK+)

BELLE 03e+e-→J/ X

CLEO 03→KSK+

BABAR 03→KSK+

Mass (MeV)

New measurementsof mass are consistent!

tot

= (19 ± 10) MeV



Open problems:

5 new measurements of c mass

States above DD thr. are not well established

'c unambiguously seen

h1c not confirmed


Open charm

DsJ

*(2317)+

BABAR: PRL 90 242001 (2003)

Potential model

New observations

Old measurements

Unexpected surprises in the D

S Spectrum |cs>+c.c.

BABAR, Belle, CLEO-c


Hybrids & Glueballs

Normal meson: 2 fermionsP = (-1)L+1

C = (-1)L+S

Excited glue: bosonic degree of freedom→ exotic quantum numbers eg. JPC=1-+, 0--, 0+-, 2+-...→ normal quantum numbers

Signal:exotic quantum numbers:

partial wave analysisnormal quantum numbers:

model comparison (LGT)

mixing with normal mesonscharm sector: few resonances

with small widths

qqg ggg

Hybrid Glueball

qq

Meson


Hybrids & Glueballs

Ex

ot i

c l

igh

t q

q

Ex

ot i

c c

c

1 -- 1 -+

0 2000 4000MeV/ c 2

10 -2

1

10 2

In the light meson spectrum exotic statesoverlap with conventional states

In the cc meson spectrum the density of states is lower and therefore the overlap


Hybrids & Glueballs

Crystal Barrel

Non-qq candidates come with similarstrength like qq resonances in pp.

LQCD: mH = 4.2-4.5 GeV

PANDA: non exotic QN 10000/day exotic QN 100/day

detection rate

Filter for exotic QN 1-+:hybridJ/X X=


Hybrids & Glueballs

Morningstar und Peardon, PRD60 (1999) 034509Morningstar und Peardon, PRD56 (1997) 4043


Hybrids & Glueballs

Recently, different experiments have reported evidences of an exotic baryon with K+n quantum numbers: +(1540); ~ 18 MeV

The+(1540) state cannot be a 3-quarks state. Its minimal quark content is (uudds)

n → K (K+n)

T.Nakano et al.,Phys. Rev. Lett. 91,012002 (2003).

KXe →(Kp)Xe

V.V. Barmin et al.,hep-ex/0304040.

d (Kp)(K+n)

S. Stepanyan et al.,hep-ex/0307018.

Theorists [R.Jaffe & F.Wilzek (hep-ph/0307341), M.Karliner & Lipkin (hep-ph/0307343)] predict charm and bottom analogues of the +(1540):

c+ with mass 2985 ± 50 MeV

p could be a good tool to search for multiquark states


Detector

Formation of ' and decay in muons

' µ+ µ -

'J/ + X

µ +µ -

similarly for electrons:→for large angles calorimeter needed.

Acceptance of detector is guided by simulations


PANDA detector


PANDA detector

side view


Tracking: Micro Vertex Detector (MVD)

2 mio. forward pixels100 x 150 m

beam pipe

pelle

t pi

pe

Readout: ASICs (ATLAS/CMS) 0.37% X0

or pixel one side - readout other side (TESLA)

Layers 5 barrel, 5 end capthickness 200 mthick. 5 layers 1-3.5 % X

0

resolution z 25 ... 100 m

7.2 mio. barrel pixels50 x 300 m


Tracking: Micro Vertex Detector (MVD)

x

y

zD0

Z0


Tracking: Straw Tubes

9000 straw tubes 15 double layers 2-14 layers are with skew angle (4-9o) tube length : 1.5 m tube diameters : 4, 6, 8 mmx,y = 150 m z = 1 mm

Example event pp → → 4K


PID: DIRC (Cerenkov)

less space than aerogel costs of calorimeterno problems with field

BaBar@SLAC


PID: DIRC (Cherenkov)

K eff.

miss-id.

reaction pp at s = 3.6 GeV/c2

degree

degr

ee


Forward RICH

Search for good combination radiator photon detector magnetic field

4 10 cm

Aerogel (n=1.02) visible light PD HPD

C6F

14 (n=1.24) CsI coated photo cath.

( < 210 nm = UV)

Proximity "focusing"compact detector


Calorimeter

PbWO4

Length = 17 X0

APD readout (in field)(E) = 1.54% / E½ + 0.3% (PM)

pp J/ +


Pellet target

Existing at WASA

Frozen hydrogen pelletsTarget density: 1016 cm-2

pellet spread: ±0.04o

pellet rate: 70000/spellet vel.: 60 m/spellet size: 20-40 µm

similar target is being constructed at ANKE@COSY

option: cluster jet targetbut 1014 cm-2 and pumps close to beam line

1 mm


Realization / Costs

Civil Construction ~ 225 MAccelerator Components ~ 265 MInstrumentation and Major Detectors ~ 185 M(PANDA Detector ~ 32 M) ~ 675 M↗1000

M(including FTE

+ newprojects)Year 2005 major money flow

Year 2012 commissioning

(PANDA)

Year 2013 regular data taking (PANDA)


Schedule


Participating institutes with representatives in CB

U BochumU BonnU & INFN BresciaU CataniaU CracowGSI Darmstadt TU DresdenJINR Dubna I + IIU ErlangenNWU EvanstonU & INFN FerraraU FrankfurtLNF-INFN FrascatiU & INFN GenovaU GlasgowU Gießen

KVI Groningen IKP Jülich I + IIU KatowiceLANL Los AlamosU MainzTU MünchenU MünsterBINP NovosibirskU PaviaU of SilesiaU TorinoPolitechnico di TorinoU & INFN TriesteU TübingenU & TSL UppsalaÖAdW ViennaSINS Warsaw

40 Institutes (32 Locations) from 9 Countries:Austria - Germany - Italy - Netherlands - Poland - Russia - Sweden - U.K. - U.S.


Conclusions

Thanks to the new FAIR HESR facility p will be used to produce...

high resolution spectroscopy with p-beam in formation experiments:E Ebeam

high yields of gluonic excitations: glueballs, hybrids, multi-quark states (100 pb - 1 b)

in medium effects by implanting mesons inside the nuclear medium

hyperon-antihyperon taggable beams

Documents

Journée Thématique IPN Orsay, 2004 PANDA, a new detector for hadronic physics at GSI (FAIR) Carsten Schwarz, GSI ● The FAIR facility HESR Storage ring