22,913 research outputs found
On Charmonia Survival Above Deconfinement
We study charmonium correlators and spectral functions at zero and finite
temperature using anisotropic lattices at several different lattice spacings.
We find evidence for survival of 1S charmonia states at leas till and
dissolution of 1P states at .Comment: contribution to the 29th Johns Hopkins Workshop in Theoretical
Physics, Budapest, Hungary, 1-3 August 200
CP-violation and mixing in charmed mesons
The Standard Model contribution to D0-anti-D0 mixing is dominated by the
contributions of light s and d quarks. Neglecting the tiny effects due to b
quark, both mass and lifetime differences vanish in the limit of SU(3)_F
symmetry. Thus, the main challenge in the Standard Model calculation of the
mass and width difference in the D0-anti-D0 system is to estimate the size of
SU(3) breaking effects. We prove that D meson mixing occurs in the Standard
Model only at second order in SU(3) violation. We consider the possibility that
phase space effects may be the dominant source of SU(3) breaking. We find that
y=(\Delta \Gamma)/(2\Gamma) of the order of one percent is natural in the
Standard Model, potentially reducing the sensitivity to new physics of
measurements of D meson mixing. We also discuss the possibility of observing
lifetime differences and CP violation in charmed mesons both at the currently
operating and proposed facilities.Comment: 13 pages, no figures, invited talk at Continuous Advances in QCD 2002
/ ARKADYFEST, May 17-23, 200
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