1. Da  ne upgrade G. Venanzoni – INFN/Frascati International Workshop on e+ e- collision from Phi to Psi Novosibirsk, 27 Feb – 2 Mar 2006 (as seen by a KLOE member)

2. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 2 Outline:  Status of DA  NE  Upgrade of DA  NE:  Short term project  Long term project  Physics program at DAFNE-2  Upgrade of the detector  Conclusion

3. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 3 DA  NE 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-K+K- 49.1% KSKLKSKL 34.1%  +       15.5% ee e+e+ KLOE detector FINUDA detector

4. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 4 DA  NE performance up to Dec 2005 2 1.4 x 10 32 cm  2 s  1 Integrated Luminosity Day performance: 7-8 pb -1 Best month  L dt ~ 200 pb  1 Total KLOE  L dt ~ 2400 pb  1 (2001,02,04,05) Off peak run Peak Luminosity

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

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

7. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 7 Da  ne Upgrade – short term (3 years) Starting from 1.510 32, 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?

8. Da  ne 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) 1.022.4 Integrated Luminosity per year (fbarn -1 ) >10 Total integrated luminosity (5 years, fbarn -1 ) >50>3 Peak luminosity (cm -1 sec -2 ) >8 10 32 >10 32

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

10. Da  ne 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

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

12. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 12 Impact of DAFNE-2 on inclusive measurement  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 10 32 cm -2 sec-1).10% stat.+ 15% syst. Errors 2) With 20 pb -1 per energy point (1year of data taking at 10 32 cm -2 sec -1 ) a precise comparison exclusive vs. inclusive can be carried out  s (GeV) L int (nb -1 ) o MEA, 14 points, Lett. Nuovo Cim.30 (1981) 65 B antiB, 19 points, Phys.Lett.B91 (1980) 155 B antiB, 19 points, Phys.Lett.B91 (1980) 155 20 pb -1

13. Da  ne 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4 BaBar, with the published L int per point (90 fb -1 ) BaBar, with 10  (the present L int ) DA F NE-2, with 20 pb -1 per point DAFNE-2 is statistically better than O(1ab -1 ) B-factories Improvement on systematics come as well

14. Da  ne 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) statistical  had  had   s (GeV) BaBar, with the published L int per point (90 fb -1 ) BaBar, with 10  (the present L int ) DA F NE-2, with 2 fb -1 @ 2.4 GeV comparison among the present BaBar analysis, an (O(1 ab -1 )) BaBar update, and L int = 2 fb -1 at 2.4 GeVper energy point @ DAFNE-2 No much improvement respects to B-factories 33

15. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 15  Physics at DAFNE-2   P [    ’]   (P   )              (S   ) / test of ChPT   ’, f 0 (980), a 0 (980) needs √s > M   At  peak  an e+/- tagger is needed (background). News:  KLOE run off-peak: “test run” for  physics  Renewed interest for per       at threshold  DAFNE-2  higher √s  gg di f 0 e a 0

16. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 16 Search for  [ f 0 (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 f 2 (1270) f 0 (980) BELLE W  >0.7 GeV      

17. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 17 Time-like form factors p1.876 n1.879  2.231 N  (p  -, n  0 )  2.378 N  (p  0, n  + )  2.385   2.395 N  (n  - )  2.464 NN  2.630  0  2.643  - (1)From  (e + e -  NN)  |G| 2 (2) From the angular distribution  |G E |/|G M | Threshold for Baryons (GeV) (3) From the polarization   (q 2 ) =  E -  M

18. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 18 Existing data Proton data - type (1) Ipothesis G E =G M Proton data: |G E |/|G M | - 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 × 10 5 ×  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

19. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 19  -factory =  ed  ’ factory BR(    ) = 1.3 × 10 -2  N  (20 fb -1 ) ~ 9 × 10 8 BR(    ’  ) = 6.2 × 10 -5  N  ’ (20 fb -1 ) ~ 5 × 10 6 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 K L      e + e - ) Improvements on forbidden/rare decays  ’ decays: Dalitz plot of  ’   +  -  scalar amplitude  ’         first observation / isospin violation  ’ at DAFNE-2

20. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 20  Beside  process, scalars f 0 (980), a 0 (980) will be copiously produced in the radiative decay of the  With 20 fb -1 the decay  f 0 , f 0  K + K - (K 0 K 0 ) (expected BR ~ 10 -(6-8) ) will be well measured (10 5 K + K - and 10 3 K 0 K 0 ).  direct measure of the g fKK coupling Scalars at DAFNE-2

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

22. Da  ne 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 ±,K L ) The ingredients of KLOE success

23. Da  ne 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

24. Da  ne 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!

25. Da  ne 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!

26. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 26 SPARES

27. Da  ne 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 to   expcted 200.000 events Prospectives for  & scalars physics@20fb -1 With 20 fb-1  f 0 , f   K + K - (KK) ( expected BR ~ 10 -6(-8) ) well measured (10 5 K + K - and 10 3 KK), direct measure of the g fKK coupling Large samaple of   9x10 8 and  ’  4x10 6 Intersting channels

28. Da  ne 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 [nb -1 /25MeV] 2fb -1 @ 2.4 GeV 89fb -1 @ 10.6 GeV GeV 1pb -1 1

29. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 29     nb, sqrt(s)=1003.71 MeV (from SND, PRD66 (2002) 032001)    nb    nb 65432106543210 10 10  (  a  ) stat  : 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 GeV 2 KLOE Data at off peak (1 GeV) (started at mid of Dec. 05)

30. Da  ne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 30 Impact of DAFNE-2 on the threshold region (     ) stat 1) total accuracy better than 3% in the region <0.35 GeV 2 ( ~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 GeV 2 efficiency = 50% flat during the KLOE data taking campaign @  s = 1 GeV we can learn a lot