da f ne upgrade
DESCRIPTION
Da F ne upgrade. (as seen by a KLOE member). G. Venanzoni – INFN/Frascati. International Workshop on e+ e- collision from Phi to Psi Novosibirsk, 27 Feb – 2 Mar 2006. Outline:. Status of DA F NE Upgrade of DA F NE: Short term project Long term project Physics program at DAFNE-2 - PowerPoint PPT PresentationTRANSCRIPT
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 upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 3
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 upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 4
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 upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 5
DANE 24h Performance (Dec. 05)
1.2e-32
8 pb-1
e-
e+ 1 A
2 A
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 6
s monitored to within 70 keVSome variations in 2004 Stable (1019.3-1019.6) in 2005
Machine energy stability
2004
2005
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 7
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?
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 8
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 9
DAFNE 2 layout
IR
Wigglers
rf
TDR in preparation: necessary to submit the project
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 10
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 11
TOTAL CROSS SECTION R
Radiativereturn
Energy Scan
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 12
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 13
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 14
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 15
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 16
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 17
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 18
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 19
-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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 20
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 21
Detector Issues
(KLOE taken as reference)
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 22
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 23
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 24
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!
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 25
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!
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 26
SPARES
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 27
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 28
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
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 29
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)
Dane upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 30
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