Charm and Beyond

Charm and Beyond*

Charm mixing in the Standard Model and Beyond

Quantum mechanical meson-antimeson oscillations are sensitive to heavy degrees of freedom which propagate in the underlying mixing amplitudes. Comparing observed meson mixing with predictions of the Standard Model (SM), modern experimental studies would be able to constrain models of New Physics (NP). Yet, extensive precission data from B-factories and the Tevatron collider show that the large ...

Rare Charm Decays in the Standard Model and Beyond

We perform a comprehensive study of a number of rare charm decays, incorporating the first evaluation of the QCD corrections to the short distance contributions, as well as examining the long range effects. For processes mediated by the c → ul+l− transitions, we show that sensitivity to short distance physics exists in kinematic regions away from the vector meson resonances that dominate the to...

Charm fragmentation and excited charm and charm-strange mesons at ZEUS

Charm hadrons were produced copiously in ep collisions with a centre-of-mass energy of 318GeV at HERA providing a means to study charm hadronisation. During first phase of the HERA operation (1992-2000), the ZEUS collaboration accumulated data sample corresponding to an integrated luminosity of ∼ 120 pb. Measurements of the D, D, D and Λc production a with the HERA I data were used to determine...

Charm and hidden charm scalar mesons in the nuclear medium

We study the renormalization of the properties of the low lying charm and hidden charm scalar mesons in a nuclear medium, concretely of the D s0 (2317), D 0 (2400) and the theoretical hidden charm state X(3700). We find that for the D s0 (2317), with negligible width at zero density, the width becomes about 100 MeV at normal nuclear matter density, while in the case of the X(3700) the width bec...