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

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

DAFNE e+e- machine at Frascati (Rome) KLOE detector e+ e- FINUDA detector BR’s for selected f decays K+K- 49.1% KSKL 34.1% rp +p+p-p0 15.5% 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

DANE performance up to Dec 2005 Peak Luminosity 1.4 x 1032 cm2s1 2 Off peak run Day performance: 7-8 pb-1 Integrated Luminosity Best month 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

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

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

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? Tabella parametri dafne? DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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 Specificare luminosita’ di picco? Cosa mettere? DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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

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

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

Impact of DAFNE-2 on inclusive measurement 20 pb-1 Lint (nb-1) 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, stat. errors on d(Dahad)/Dahad  O(5%); systematic error will be reduced as well 4) a precise comparison exclusive vs. inclusive can be carried out MEA, 14 points, Lett. Nuovo Cim.30 (1981) 65 B antiB, 19 points, Phys.Lett.B91 (1980) 155 s (GeV) Errore su Delta alpha/delta alpha =20% DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006 s (GeV)

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

statistical dshad / shad (%) Impact of DAFNE-2 on the range [1-2] GeV (3p) 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 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, in the impact on d(Dahad) /Dahad : p- p+ p0: O(9%) | O(3%) | O(8%) statistical dshad / shad (%) DAFNE-2 is competitive with B-factories with current statistics s (GeV) DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

gg Physics at DAFNE-2 News: “test run” for gg physics 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

Search for s [ f0(600) ] in gg  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

Time-like form factors From s(e+e-  NN)  |G|2 Threshold for Baryons (GeV) p 1.876 n 1.879 L 2.231 Np (pp- , np0) S+ 2.378 Np (pp0 , np+) S0 2.385 Lg S- 2.395 Np (np-) D 2.464 Np X0 2.630 Lp0 X- 2.643 Lp- (2) From the angular distribution  |GE|/|GM| (3) From the polarization  F(q2) =fE - fM DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

Existing data Neutron: only FENICE (500 nb-1, ~75 evts signal) 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) No dati available on pola per p e n? 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

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 Eg = 363 Mev H’ = 60 MeV DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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-1 the decay f  f0g , f0 K+K- (KK) (expected BR ~ 10-(6-8) ) will be well measured (105 K+K- and 103 KK). direct measure of the gfKK coupling Eg = 363 Mev H’ = 60 MeV DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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

The ingredients of KLOE success E.M: Calorimeter: Drift Chamber: Full angular coverage Good momentum resolution 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

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

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 further upgrade). Precise measurements (of R for example) need confirmation from different detectors/experiments! DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

Time schedule Experiment Letters of Intent  Spring 2006 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 If you are interested to join this adventure, you are welcome! DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006

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

Prospectives for h & scalars physics@20fb-1 Large samaple of h  9x108 and h’  4x106 Intersting channels h p0gg BR( 8.0 ± 2.7 ) × 10- with e=4.63% 3000 evts 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 to s(600) expcted 200.000 events Channels presently studied with KLOE: spettro in massa di gamma gamma per pi0gamma gamma K+K- FSR bkg fattore 10 rispetto f0 -> K+k- si preferisce quindi f->k0k0 With 20 fb-1 f  f0g , f K+K- (KK) (expected BR ~ 10-6(-8) ) well measured (105 K+K- and 103 KK), direct measure of the gfKK coupling DaFne upgrade – G. Venanzoni, Novosibirsk, 27 Feb – 2 Mar 2006