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Da F ne upgrade

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

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Da F ne upgrade

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  1. DaFne 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

  2. Outline: • Status of DAFNE • Upgrade of DAFNE: • Short term project • Long term project • Physics program at DAFNE-2 • Upgrade of the detector • Conclusion DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  3. DAFNE e+e- machine at Frascati (Rome) KLOE detector e+ e- FINUDA detector • e+e f s ~ mf = 1019.4 MeV • beams cross at an angle of 12.5 mrad • LAB momentum pf~ 13 MeV/c DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  4. DANE performance up to Dec 2005 Peak Luminosity 1.4 x 1032 cm2s1 2 Off peak run Integrated Luminosity Day performance: 7-8 pb-1 Bestmonth L dt ~ 200 pb1 Total KLOE L dt ~ 2400 pb1 (2001,02,04,05) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  5. DAFNE 24h Performance (Dec. 05) 1.2e-32 2 A e- e+ 1 A 8 pb-1 DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  6. Machine energy stability s monitored to within 70 keV Some variations in 2004 Stable (1019.3-1019.6) in 2005 2004 2005 DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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

  9. TDR in preparation: necessary to submit the project IR DAFNE 2 layout Wigglers rf DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  10. Physics at DAFNE-2 See presentation of M. Testa • Kaon Physics (including test of QM with interferometry) • (Multi)hadronic cross section up to 2.4 GeV • Spectroscopy (vector mesons) • gg physics • Time-like form factors (baryons and mesons) • Radiative f decays • Kaonic Nuclei See presentation of S. Eidelman DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  11. TOTAL CROSS SECTION R Energy Scan Radiative return DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  12. Impact of DAFNE-2 on inclusive measurement 20 pb-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 Lint (nb-1) • MEA, 14 points, Lett. Nuovo Cim.30 (1981) 65 • B antiB, 19 points, Phys.Lett.B91 (1980) 155 s (GeV) s (GeV) DaFne 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) 3p BaBar, with the published Lint per point (90 fb-1) BaBar, with 10  (the present Lint ) DAFNE-2, with 20 pb-1 per point 2K2p • DAFNE-2 is statistically better than O(1ab-1) B-factories • Improvement on systematics come as well 4p DaFne 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) BaBar, with the published Lint per point (90 fb-1) BaBar, with 10  (the present Lint ) DAFNE-2, with 2 fb-1 @ 2.4 GeV 3p comparison 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 statistical dshad / shad (%) • No much improvement respects to B-factories s (GeV) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  15. gg Physics at DAFNE-2 gg P [p0 , h , h’] G(Pgg) gg p0p0 , p+p- , hp, hpp G(Sgg) / test of ChPT • h’, f0(980), a0(980) needs √s > Mf • At f peak an e+/- tagger is needed (background). • News: • KLOE run off-peak: “test run” for gg physics • Renewed interest for per gg p0p0 at threshold • DAFNE-2  higher √s Ggg di f0 e a0 DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  16. Search for s [ f0(600) ] ingg p0p0  G(s gg)×G(s pp) sensitive to quark structure (4q vs. 2q)  Which √s ? 1 GeV ok (Off f peak)  More information from KLOE test run BELLE f0(980) f2(1270) gg p+p- Efficiency cut Only data available gg p0p0 [Crystal Ball @ DORIS 1990] Wgg>0.7 GeV DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  17. From s(e+e- NN)  |G|2 (2) From the angular distribution  |GE|/|GM| (3) From the polarization  F(q2) =fE - fM Time-like form factors Threshold for Baryons (GeV) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  18. Existing data Proton data - type (1) Ipothesis GE=GM Neutron: only FENICE (500 nb-1, ~75 evts signal) No data available on polarization 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 × e (at threshold) to 10000 × e (a 2.5 GeV)  Total number of events ~ 5 × 105 × e With e = 10% DAFNE-2 is 10 times better Babar (current results) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  19. h, h’ at DAFNE-2 F-factory = h ed h’ factory BR(f hg) = 1.3 ×10-2  Nh(20 fb-1) ~ 9 × 108 BR(f  h’g) = 6.2 ×10-5  Nh’(20 fb-1) ~ 5 × 106 Monochromatic prompt photon: clear signature Mixing h – h’: Uncertainty dominated by systematics; improvement can come by measuring main h’ BR’s h decays: h p0gg (test ChPT; major improvements expected with 20 fb-1) Dalitz decays: h  e+e-g, m+m-g, e+e-e+e-  Transition FF h  p+p-e+e- (Test of CP violation, analogous to KL  p+p-e+e- ) Improvements on forbidden/rare decays h’ decays: Dalitz plot of h’hp+p-  scalar amplitude h’p+p-p0  first observation / isospin violation DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  20. Scalars at DAFNE-2 • Beside gg process, scalars f0(980), a0(980) • will be copiously produced in the radiative decay of the f • With 20 fb-1the decay f  f0g , f0K+K- (K0K0) (expected BR ~ 10-(6-8))will be well measured (105K+K- and 103K0K0). direct measure of thegfKK coupling DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  21. Detector Issues (KLOE taken as reference) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  22. The ingredients of KLOE success E.M. Calorimeter: Drift Chamber: Good momentum resolution Full angular coverage Exceptional timing capabilities Large tracking volume Large lever arm Minimization of materials Excellent e/ separation based on t.o.f. Good 0 reconstruction capabilities Full kinematical reconstruction of events Maximization of efficiency for long-lived particles (K± ,KL) DaFne 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 gg physics DaFne 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! DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  25. Time schedule Conceptual Design Report of the accelerator end 2006 international 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! DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  26. SPARES DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  27. Prospectives for h & scalars physics@20fb-1 Large samaple ofh9x108and h’ 4x106 Intersting channels h p0gg BR( 8.0 ± 2.7 ) × 10- with e=4.63% 3000evts study of gg spectrum h, h’ g l+l-,lll(‘)l(‘)(Dalitz & double dalitz decays) with high statistics h p+p-e+e -test of CP violation beyond SM h’ hp+p- sensitive tos(600)expcted 200.000 events With 20 fb-1 f  f0g , fK+K- (KK) (expected BR ~ 10-6(-8)) well measured (105K+K- and 103KK), direct measure of the gfKK coupling DaFne 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 [nb-1/25MeV] 2fb-1 @ s=2.4 GeV 1pb-1 89fb-1 @ s=10.6 GeV 2fb-1 @ 2.4 GeV 89fb-1 @ 10.6 GeV 1 GeV GeV DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  29. 6 5 4 3 2 1 0 1010  (dam)stat KLOE Data at off peak (1 GeV)(started at mid of Dec. 05) sp+p-p0 = 329.8 nb sp+p-g = 4.4 nb • stat. error on a: [1.5-2.5]10-10 (300-100 pb-1) • comparible with the expected syst.error (dsppg/sppg )syst~ 2% from region < 0.35 GeV2 sp+p-p0 = 6 nb, sqrt(s)=1003.71 MeV (from SND, PRD66 (2002) 032001) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

  30. Impact of DAFNE-2 on the threshold region bin width = 0.01 GeV2 efficiency = 50% flat 1) 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) (dsppg/sppg )stat during the KLOE data taking campaign @ s = 1 GeV we can learn a lot DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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