Beyond the Standard Model: the clue from charm ... Precision study of b and c decays deviations in expected behaviour of b and c quarks evidence for new physics + will elucidate new physics if found elsewhere Rare decays Mixing & CPV ..the clue from charm

Precision measurements of the D+ and Ds decay constants To use the full power of b and c decays, theoretical calculations of strong interactions must be used. The lattice gauge approach promises precision calculations that must be confronted with data Precision measurements of the D+ and Ds decay constants Semileptonic charm decay measurements Vcd and Vcs directly as well as input on hadronic matrix element ..the clue from charm

Direct signatures for new physics in charm decays Bigi-Sanda hep-ph/9909479 “A priori it is quite conceivable that qualitatively different forces drive the decays of up-type and down-type quarks . More specifically, non-Standard-Model forces might exhibit a very different pattern for the two classes of quarks”. Charm decays are the only up-type quarks that allow to probe this physics:non-strange light flavour hadrons do not allow for oscillations and top-flavoured hadrons do not even form in a practical way ..the clue from charm

BaBar measurement is @ 57.1 fb-1 Mixing & CPV Motivation: suppressed in the charm sector in the SM. If “measured”, would suggest SM extention BaBar measurement is @ 57.1 fb-1 ..the clue from charm

New limits expected by BaBar and Belle Cleo-c @ 95% C.L. CP violation Direct CP violation in D0 and D+ Indirect CP violation in D0 decays CP violation measurements exploiting the quantum coherence of the D0 D0bar produced pair y(3770)  DD ; JP=1- CP violation asymmetry sensitivity ACP<0.01 @ Cleo-c and Beauty Factories ..the clue from charm

CDF and D0 can trigger on dimuons promising Rare decays Motivation: lepton number violation study investigation of long range effects and SM extention FOCUS improved results by a factor of 1.7 –14: approaching theoretical predictions for some of the modes but still far for the majority CDF Br(D0m+m-)<2.4 x10-6 @ 90% C.L. is the best limit for this mode (65 pb-1 data) CDF and D0 can trigger on dimuons promising Cleo-c sensitivity 10-6 ..the clue from charm

Leptonic decays Motivations: decay constants measurements Lattice predicts fB/fD & fBs/fDs with small errors ..the clue from charm

Hadronic and semileptonic decays Over constrain the “Unitarity Triangle” Inconsistencies New Physics semileptonic decays are the easiest way to determine CKM elements:QCD effects contained in form factors. Comparison with LGT and quark model calculations! ..the clue from charm

Status of CKM Matrix Current VCKM From direct Measurements B Vub/Vub 17% l n B p D Vcd/Vcd 7% K Vcs/Vcs =11% Vcb/Vcb 5% Bd Vtd/Vtd =36% Bs Vts/Vts 39% Vus/Vus =1%  Vud/Vud 0.1% e Vtb/Vtb 29% t b W Current VCKM From direct Measurements -no unitarity imposed CLEO-c will redefine 2nd generation elements And enable improvements in 3rd generation ..the clue from charm

Potential Impact on VCKM Vub/Vub 17% l n B p D Vcd/Vcd 7% K Vcs/Vcs 11% Vcb/Vcb 5% Bd Vtd/Vtd 36% Bs Vts/Vts 39% Vus/Vus 1%  Vud/Vud 0.1% e Vtb/Vtb 29% t b W Current VCKM From direct Measurements -no unitarity imposed 2% 5% 3% Future VCKM CLEO-c will redefine 2nd generation elements And enable improvements in 3rd generation ..the clue from charm

Summary of reach ..the clue from charm