Weak Decays Of Charm Hadrons: The Next Lesson On QCD -- And Possibly More!

Second-generation theoretical technologies -- heavy quark expansions, QCD sum rules and QCD simulations on the lattice -- are arriving on the scene, allowing a treatment of charm decays that is genuinely based on QCD. The availability of those theoretical tools strengthens the case for the need for comprehensive precision measurements of charm decays. It is pointed out that the decays of charm mesons as well as of charm baryons have to be systematically analysed to gain control over theoretical uncertainties. A $\tau$-charm factory with $E_{c.m.}\leq 5.5$ GeV is optimally suited for such a program. It would lead to a deeper understanding of QCD that would also prepare us better for exploiting the discovery potential anticipated in beauty decays. In addition it is quite conceivable (though certainly not guaranteed) that there arise fundamental surprises, such as non-canonical rare $D$ decays, $D^0$-$\bar D^0$ oscillations and CP violation in charm decays which would dramatically alter our perspective on Nature's fundamental forces.Comment: 9 pages, LATEX, CERN-TH.-7039/93, Invited Talk at the Third Workshop on the Tau-Charm Factory, Marbella, Spai

Studies of charmed states in amplitude analyses at LHCb

Amplitude analysis is a powerful tool to study the properties of intermediate resonances produced in the decays of B mesons. At LHCb we have studied B+ decays to X(3872) K+, where X(3872) decays to J/psi pi+ pi-, to determine the quantum numbers of the X(3872), and B+ decays to proton anti-proton K+ to learn more about (charm anti-charm) to proton anti-proton transitions. We also exploit the spin of the J/psi to perform amplitude analyses of the decays B0_s to J/psi pi+ pi-, B0_s to J/psi K+ K-, B0 to J/psi pi+ pi-, and B0 to J/psi K+ K-. Our results use 1.0 inverse femtobarn of data taken in 2011 from 7 TeV proton-proton collisions, provided by the LHC.Comment: 9 pages, 3 figures, to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013

Rare Charm Decays at LHCb

Studies of rare decays are an indirect probe of New Physics (NP). This document presents recent measurements of rare decays in the charm sector by the LHCb experiment. The analyses are performed with proton-proton collision data at $\sqrt{s}$ = 7 TeV recorded in 2011.Comment: to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013

Quantum Correlated D Decays at SuperB

We present the prospects for studying quantum correlated charm decays at the ψ(3770) using 0.5-1.0 ab^(-1) of data at SuperB. The impact of studying such double tagged decays upon measurements in other charm environments will be discussed