Da ne upgrade G. Venanzoni – INFN/Frascati International Workshop on e+ e- collision from Phi to...

Dane upgrade

G. Venanzoni – INFN/Frascati

International Workshop on e+ e- collision from Phi to PsiNovosibirsk, 27 Feb – 2 Mar 2006

(as seen by a KLOE member)

Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 2

Outline:

Status of DANE

Upgrade of DANE:

Short term project

Long term project

Physics program at DAFNE-2

Upgrade of the detector

Conclusion


DANE e+e- machine at Frascati (Rome)

• e+e s ~ m = 1019.4 MeV

• beams cross at an angle of 12.5 mrad • LAB momentum p ~ 13 MeV/c

BR’s for selected decays

K+K- 49.1%

KSKL 34.1%

+ 15.5%

e

e+

KLOE detectorKLOE detector

FINUDA detectorFINUDA detector


DANE performance up to Dec 2005

2

1.4 x 1032 cm2s1

Integrated Luminosity Day performance: 7-8 pb-1

Best month L dt ~ 200 pb1

Total KLOE L dt ~ 2400 pb1 (2001,02,04,05)

Off peakrun

Peak Luminosity


DANE 24h Performance (Dec. 05)

1.2e-32

8 pb-1

e-

e+ 1 A

2 A


s monitored to within 70 keVSome variations in 2004 Stable (1019.3-1019.6) in 2005

Machine energy stability

2004

2005


Dane Upgrade – short term (3 years)

Starting from 1.51032, 2fb-1/year:

Reduction of e- ring beam impedance (by a factor 2) :

Removal and shielding of the broken Ion-Cleaning-Electrodes

Higher positron current (up to 2 A), so far limited to 1.3 A:

New injection kickers

Ti-Coating against electron cloud

Feedback upgrades

Wigglers modifications to increase Lifetime (by a factor 2):

New interaction region

Transfer lines upgrade (continuous injection)

To be discussed: Crab cavities, waist modulation (RF quads)

Final luminosity 3 times higher?


DAFNE-2: Long term upgrade (2010)also for high energy program (up to 2.4 GeV)

Change of machine layout, insertion of: - Superconducting cavities

- Superconducting wigglers - Ramping Dipoles - New vacuum chamber

Energy (cm) (GeV) 1.02 2.4

Integrated Luminosity per year (fbarn-1) >10

Total integrated luminosity (5 years, fbarn-1)>50 >3

Peak luminosity (cm-1sec-2) >8 1032 >1032


DAFNE 2 layout

IR

Wigglers

rf

TDR in preparation: necessary to submit the project


Kaon Physics (including test of QM with interferometry)

(Multi)hadronic cross section up to 2.4 GeV

Spectroscopy (vector mesons)

physics

Time-like form factors (baryons and mesons)

Radiative decays

Kaonic Nuclei

Physics at DAFNE-2

See presentation of M. Testa

See presentation of S. Eidelman


TOTAL CROSS SECTION R

Radiativereturn

Energy Scan


Impact of DAFNE-2 on inclusive measurement

s (GeV)s (GeV)

1) Most recent inclusive

measurements: MEA and B antiB,

with total integrated luminosity of

200 nb-1 (one hour of data taking at

1032 cm-2 sec-1).10% stat.+ 15%

syst. Errors

2) With 20 pb-1 per energy point (1year

of data taking at 1032 cm-2 sec-1 ) a

precise comparison exclusive vs.

inclusive can be carried out

s (GeV)s (GeV)

Lin

t (n

b-1)

o MEA, 14 points, MEA, 14 points, Lett. Nuovo Cim.30 (1981) 65Lett. Nuovo Cim.30 (1981) 65

• B antiB, 19 points, B antiB, 19 points, Phys.Lett.B91 (1980) 155Phys.Lett.B91 (1980) 155

20 pb20 pb-1-1


Impact of DAFNE-2 on exclusive channels in the range [1-2] GeV with a scan (Statistical only)

2K2

3

4

BaBar, with the published BaBar, with the published LLintint per per

point (90 fbpoint (90 fb-1-1))

BaBar, with 10 BaBar, with 10 (the present (the present LLint int ))

DADAFFNE-2, with 20 pbNE-2, with 20 pb-1-1 per point per point

• DAFNE-2 is statistically better than O(1ab-1) B-factories • Improvement on systematics come as well


Impact of DAFNE-2 on the range [1-2] GeV using ISR @ 2.4 GeV (Statistical only)

stat

isti

cal

stat

isti

cal

had

h

ad

hadhad

s (GeV)s (GeV)

BaBar, with the published BaBar, with the published LLintint per point per point (90 fb(90 fb-1-1))

BaBar, with 10 BaBar, with 10 (the present (the present LLint int ))

DADAFFNE-2, with 2 fbNE-2, with 2 fb-1-1 @ 2.4 GeV @ 2.4 GeVcomparison among the present

BaBar analysis, an (O(1 ab-1))

BaBar update, and Lint = 2 fb-1 at

2.4 GeVper energy point @

DAFNE-2

• No much improvement respects to B-factories

3


Physics at DAFNE-2

P [’] (P) (S) / test of ChPT

’, f0(980), a0(980) needs √s > M

At peak an e+/- tagger is needed (background).

News: KLOE run off-peak:

“test run” for physicsRenewed interest for per at threshold DAFNE-2 higher √s gg di f0 e a0


Search for [ f0(600) ] in

sensitive to quark structure (4q vs. 2q) Which √s ? 1 GeV ok (Off peak) More information from KLOE test run

Only data available [Crystal Ball @ DORIS 1990]

Efficiency cut

f2(1270)

f0(980)

BELLE

W>0.7 GeV


Time-like form factors

p 1.876

n 1.879

2.231 N(p- , n0)

2.378 N(p0 , n+)

2.385

2.395 N(n-)

2.464 N

2.630 0

2.643 -

(1)From (e+e- NN) |G|2

22

22 2

3

4sG

s

MsG

s E

N

M

22

222

2

sin4

cos14

sGs

MsG

s

C

d

dE

NM

(2) From the angular distribution |GE|/|GM|

Threshold for Baryons (GeV)

(3) From the polarization (q2) =E - M


Existing data

Proton data - type (1)Ipothesis GE=GM

Proton data: |GE|/|GM| - type (2)

DAFNE-2: with a scan of 20 points, 50 pb-1 per point, (one year of data taking) from 40000 × (at threshold) to 10000 × (a 2.5 GeV) Total number of events ~ 5 × 105 ×With = 10% DAFNE-2 is 10 times better Babar (current results)

Neutron: only FENICE (500 nb-1, ~75 evts signal)

No data available on polarization


-factory = ed ’ factoryBR( ) = 1.3 ×10-2 N(20 fb-1) ~ 9 × 108

BR( ’) = 6.2 ×10-5 N’(20 fb-1) ~ 5 × 106

Monochromatic prompt photon: clear signature

Mixing – ’: Uncertainty dominated by systematics;improvement can come by measuring main ’ BR’s

decays: (test ChPT; major improvements expected with 20 fb-1)Dalitz decays: e+e-, , e+e-e+e- Transition FF e+e- (Test of CP violation, analogous to KL e+e- )Improvements on forbidden/rare decays

’ decays:Dalitz plot of ’+- scalar amplitude ’ first observation / isospin violation

’ at DAFNE-2


Beside process, scalars f0(980), a0(980) will be copiously produced in the radiative decay of the

•With 20 fb-1 the decay f0 , f0K+K- (K0K0) (expected BR ~ 10-(6-8) ) will be well measured (105 K+K- and 103 K0K0). direct measure of the gfKK coupling

Scalars at DAFNE-2


Detector Issues

(KLOE taken as reference)


E.M. Calorimeter:

Full angular coverage

Exceptional timing capabilities

Large lever arm

Drift Chamber:

Good momentum resolution

Large tracking volume

Minimization of materials

Good 0 reconstruction capabilities

Excellent e/ separation based on t.o.f.

Full kinematical reconstruction of events

Maximization of efficiency for long-lived particles (K± ,KL)

The ingredients of KLOE success


There can be improvements

Still, based on our experience, some possible modifications can improve KLOE performance

• Use of a lower magnetic field. This can increase acceptance for several of the above mentioned channels and ease pattern recognition

• Insertion of a vertex chamber. At present, first tracking layer is at 30 cm (i.e. 50 S) from the I.P.

• Try some z coordinate reconstruction in the drift chamber. Pattern recognition would benefit of it.

• Increase calorimeter’s readout granularity. Can improve photon counting, as well as particle identification.

• A small angle tagger for physics


Conclusion

A high luminosity factory is a perfect tool to study a wide variety of relevant physics topics in several distinct and complementary ways

With KLOE we have learned a lot on how to perform these measurements and have solid ideas on the potentialities of our detector

We have also several ideas on the potential improvements that can be done and intend to study in detail the feasibility and relevance of all of them in the coming months

The high energy program is important. The detector upgrade discussed is fine for that (Only FF measurement requires a slight upgrade). Precise measurements (of R for example) need confirmation from different detectors/experiments!


Time schedule

Conceptual Design Report of the accelerator end 2006international collaboration on the machine design is highly desirable

Preliminary Letters of Intent for experiments are in preparation. We need to have an international collaboration.

Experiment Letters of Intent Spring 2006

Some of you are already present in the high energy program. If other people are interest, they are very welcome!


SPARES


R( 8.0 ± 2.7 ) × 10 with=4.63% 3000 evts

study of spectrum

’ l+l-,lll(‘)l(‘) (Dalitz & double dalitz decays) with high statistics

e+e - test of CP violation beyond SM

’ sensitive toexpcted

200.000 events

Prospectives for & scalars physics@20fb-1

With 20 fb-1 f0 , fK+K- (KK) (expected BR ~ 10-6(-8) ) well measured (105 K+K- and 103 KK), direct measure of the gfKK coupling

Large samaple of 9x108 and ’ 4x106

Intersting channels


ISR Luminosity for different c.m. energies - We integrated dL/dm for

25 MeV bin sizes. 2fb-1 @ s=1.02 GeV

2fb-1 @ s=2.4 GeV

89fb-1 @ s=10.6 GeV[n

b- 1/2

5MeV

]2fb-1 @ 2.4 GeV89fb-1 @ 10.6 GeV

GeVGeV

1pb-1

1


nb, sqrt(s)=1003.71 MeV

(from SND, PRD66 (2002) 032001)

nbnb

6

5

4

3

2

1

01010

10

10

( ( aa

))st

atst

at

• stat. error on a:: [1.5-2.5]10-10 (300-100 pb-1)

• comparible with the expected syst.error

()syst ~ 2% from region < 0.35 GeV2

KLOE Data at off peak (1 GeV)(started at mid of Dec. 05)


Impact of DAFNE-2 on the threshold region

()stat1) total accuracy better than 3% in the

region <0.35 GeV2 ( ~3 × 10-10) is a hard

task for KLOE

2) This accuracy could be improved in the

future, using ISR at DAFNE-2 (off-peak)

bin width = 0.01 GeV2

efficiency = 50% flat

during the KLOE

data taking campaign @ s = 1 GeV

we can learn a lot

Da ne upgrade G. Venanzoni – INFN/Frascati International Workshop on e+ e- collision from Phi to...

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