Charm semileptonic decays

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Presentation transcript:

Charm semileptonic decays Physics goals Fi(q2) accurate measurements↔ validation of LQCD computations From D to B ↔ improve accuracy on Vub Study 0+ states (Kπ, ππ, KK) ↔ chiral symmetry, rare B decays Where? Inside BaBar: few people working on c sl. decays CLEO-c: D at rest, running (expect 750 pb-1 on D0,+) BELLE: develop an approach « à la CLEO-c » 11/10/2005 A.Oyanguren, P. Roudeau, J. Serrano

A.Oyanguren, P. Roudeau, J. Serrano Dl3 decays preliminary with 20fb-1 Properties One hadronic form factor (ml=0) Angular distribution known: sin2(θl) Compare F(q2) with LQCD Statistics δm=m(D)-m(D) CLEO_c: 6500 K-eν ( 280pb-1) → 15-20 K with total stat. BELLE : 2500 K-eν ( 280fb-1) BaBar: 1000 K-eν ( 1fb-1) with higher backg. and less resolution 11/10/2005 A.Oyanguren, P. Roudeau, J. Serrano

A.Oyanguren, P. Roudeau, J. Serrano Dl4 decays 3 form factors Statistics Decay distribution depends on 5 variables: large statistics needed 11/10/2005 A.Oyanguren, P. Roudeau, J. Serrano

A.Oyanguren, P. Roudeau, J. Serrano Kl4 decays Statistics Geneva-Saclay (1977): 30k evts E865 (2001): 400k evts NA48 …. 11/10/2005 A.Oyanguren, P. Roudeau, J. Serrano

Dl4 decays actual results Experiment FOCUS: photo-production at FNAL (1996-1997) Channel: D+ → K-+μ+ν Statistics: 30k events 11/10/2005 A.Oyanguren, P. Roudeau, J. Serrano

A.Oyanguren, P. Roudeau, J. Serrano Conclusions Expected statistics in BaBar Channel: D*+ → D0+, D0→ K0-e+ Channel: D*+ → D0+, D0→ K-0e+ν Channel: D*+ → D+0, D+→ K-π+e+ν Statistics: >100k events Channel: D*+s→ D+sγ, D+s→ K-K+e+ν Channel: D+s→ φe+ν Expect clean measurements: δS-δP (mK) compare with chiral symmetry predictions ms compare Fi(q2) measurements with LQCD ….. difficult analyses … ….. data is there …. 11/10/2005 A.Oyanguren, P. Roudeau, J. Serrano