1. Goal of the experiment
Goal of the FOCUS experiment is:
1. to accumulate a sample of fully reconstructed
charm decays ten times larger than the E687 ,i.e.,10 6 events
2. to perform with such a sample precision measurements of charm
lifetimes, hadronic and semileptonic decays, spectroscopy, and search
of rare phenomena such as mixing, CPV, rare and forbidden decays.
Goal 1 was reached and amply surpassed during the 1996-1997 data
taking period.
2. Physics achievements during the year 2002
Data analysis in progress. Completed the optimization of the simulation code.
New results on charm spectroscopy, DCS decays, charm lifetimes have been
published as well as studies on the light quarks.
Amplitude analysis (Dalitz plot) of the 3-body decay modes of the charm mesons
have been carried out and physics results have been presented at several
international conferences
3. INFN contribution to the experiment in terms of manpower
Fraction of INFN physicists: 35%. (USA 38%, Brazil 9%, Puerto Rico
6%, Mexico 6%, Korea 6%).
Funding foreseen in the 2003 Budget: 151 KEuro.
4. Number of publications in refereed journals in 2002: ten papers
1. OBSERVATION OF A 1750-MEV/C**2 ENHANCEMENT IN THE
DIFFRACTIVE PHOTOPRODUCTION OF K+ K-.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Lett.B545:50-56,2002
2. NEW MEASUREMENTS OF THE D+ ---> ANTI-K+*0 MU+ NU
FORM-FACTOR RATIOS.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Lett.B544:89-96,2002
3. A NEW MEASUREMENT OF THE XI0(C) LIFETIME.
By Focus (J.M. Link et al.)
Published in Phys.Lett.B541:211-218,2002
4. NEW MEASUREMENTS OF THE GAMMA(D+ ---> ANTI-K*0 MU+ NU) /
GAMMA(D+ ---> K-PI+ PI+) AND GAMMA(D+(S) ---> PHI MU+ NU) /
GAMMA(D+(S) ---> PHI PI+) BRANCHING RATIOS.
By Focus Collaboration (J.M. Link et al.)
Published in Phys.Lett.B541:243-250,2002
5. MEASUREMENT OF THE D+ AND D+(S) DECAYS INTO K+ K- K+.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Lett.B541:227-233,2002

6. MEASUREMENTS OF RELATIVE BRANCHING RATIOS OF LAMBDA+(C) DECAYS
INTO STATES CONTAINING SIGMA.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Lett.B540:25-32,2002
7.
THE TARGET SILICON DETECTOR FOR THE FOCUS
SPECTROMETER.
By FOCUS Collaboration (J.M. Link et al.)
e-Print Archive: hep-ex/0204023, submitted to NIM A
8. NEW MEASUREMENTS OF THE D0 AND D+ LIFETIMES.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Lett.B537:192-200,2002
9. EVIDENCE FOR NEW INTERFERENCE PHENOMENA IN THE DECAY
D+ ---> K- PI+ MU+ NU.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Lett.B535:43-51,2002
10. A HIGH STATISTICS MEASUREMENT OF THE LAMBDA+(C) LIFETIME.
By FOCUS Collaboration (J.M. Link et al.)
Published in Phys.Rev.Lett.88:161801,2002
5.
Number of talks to conferences (from INFN) : Thirteen talks in 1999,
twelve talks in 2000, ten talks in 2001, nine talks in 2002.
6. Number of undergraduate and doctoral thesis on the experiment:
5 undergraduate, 1 doctoral in 2002 (Italian Institutes only)
7. Leadership role in the experiment (INFN and others )
1. Spokesperson ( L.Moroni, Milano - J.Cumalat, Colorado)
2. Silicon uvtx detector ( L.Moroni, Milano )
3. Outer em Calorimeter ( S.Bianco, Frascati )
4. Inner em Calorimeter (J.Cumalat, Colorado)
5. Hadron Calorimeter ( G.Boca, Pavia - H.Cheung, Fermilab)
6. Outer Muon ( G.Boca, Pavia - T.Handler, Tennessee)
7. Inner Muon, Cerenkov (J.Wiss, Indiana-Champaign)
8. MWPC (H.Cheung, Fermilab)
9. Tracking workgroup ( D.Pedrini, Milano )
10. Calorimetry workgroup ( S.Bianco, Frascati )
11. SW structure workgroup( D.Menasce, Milano )
12. Montecarlo workgroup (E.Gottschalk, Fermilab)
13. Cal simulation workgroup ( C.Riccardi, Pavia )
14. Cerenkov workgroup (J.Wiss, Indiana-Champaign)
15. DAQ workgroup( F.Prelz, Milano )
16. Muons workgroup (P.Sheldon, Vanderbilt)
17. Event display workgroup (E.Gottschalk, Fermilab)
18. Trigger workgroup (H.Cheung, Fermilab)
19. 1st level filtering stream coordinator n.1 (Leptons) (A.Lopez, Puertorico)
20. 1st level filtering stream coordinator n.2 (Vertex) (J.Wiss,
Indiana-Champaign)
21. 1st level filtering stream coordinator n.3 (Diffractive) (K.Cho, Tennessee)
22. 1st level filtering stream coordinator n.4 (Emcals) ( S.Bianco, Frascati )
23. 1st level filtering stream coordinator n.5 (All charged) ( D.Pedrini, Milano )
24. 1st level filtering stream coordinator n.6 (Baryons) (L.Cinquini, Colorado)
8. Innovative Instruments
1. Silicon Microstrip Detector
2. Tile Calorimeters
3. WEB-based remote detector control and monitoring during the
1996-1997 data taking period.
9. Competing experiments : CLEO, E791
10. International committees which have reviewed the experiment
1. INFN Richter Board

2. Fermilab PAC
3. INFN-DOE-NSF
1. List of milestones for INFN activities in 2003, analysis, running, and
constructions.
1. Drafting of paper, presentation at conferences and publication of the
study on the SCSD D0

K-K+ and D0
 pi-pi+ with an isospin analysis.
2. Drafting of paper, presentation at conferences and publication of the study on
the 4-body decays of chamed mesons.
3. Drafting of paper, presentation at conferences and publication of the study on
the Dalitz plot analysis of the 3-body decays of D+ and Ds.
4. Drafting of paper, presentation at conferences and publication of the
measurements of the masses and widths of the excited states D1 and D2.
5. Drafting of paper, presentation at conferences and publication of
BR measurements of charmed baryons.
6. Drafting of paper, presentation at conferences and publication of the
evidence of a narrow resonance at 1.9 GeV/c 2 decaying in 6 pions.
FOCUS-E831 papers