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PURPOSE To evaluate postoperative spherical aberration reduction and increase of visual acuity with new Flex Scan and custom ablation software. METHODS We created a new customized low spherical aberration ablation profile for myopic patients (true spherical ablation). This aspheric algorithm increases ablation in the midperiphery and periphery to reduce… (More)
We review recent developments in charm physics, focusing on the physics of charmed mesons. We discuss charm spectroscopy, decay constants, as well as searches for new physics with charmed mesons. We discuss D 0 − D 0 mixing and CP-violation in charm decays. We also present the modified Nelson plot of charm mixing predictions.
We present a calculation of subleading 1/m b corrections to spectator effects in the ratios of beauty hadron lifetimes in heavy-quark expansion. We find that these effects are sizable and should be taken into account in systematic analyses of heavy hadron lifetimes. In particular, the inclusion of 1/m b corrections brings into agreement the theoretical… (More)
PURPOSE To evaluate the performance of the Nidek MK-2000 microkeratome. METHODS The Nidek MK-2000 microkeratome was used in 1,220 cases of LASIK with the Nidek EC-5000 excimer laser. Patients had a wide range of myopia (-0.75 to -25.00 D), hyperopia (+0.75 to +9.00 D) and/or astigmatism (-7.00 to +6.50 D). The flap was created with the 130-microm… (More)
Standard model factorization can account for the large rate for B ± → η ′ K ±. The large rate for B → η ′ X s is more problematic and requires a " cocktail " solution. Individual contributions from factorization, b → η ′ sg, and " intrinsic charm " fall significantly short of the observed rate. In contrast, the observed η ′ yields are easily explained in… (More)
We present exact results, at next-to-leading order in renormalization-group improved perturbation theory, for the Wilson coefficients appearing at order 1/m Q in the heavy-quark expansion of heavy–light current operators. To this end, we complete the calculation of the corresponding two-loop anomalous dimension matrix. Our results are important for… (More)
Recent experimental results on the color-suppressed nonleptonic decays ¯ B 0 → D (*)0 π 0 provide evidence for a failure of the naive factorization model and for sizeable relative strong-interaction phases between class-1 and class-2 ¯ B → D (*) π decay amplitudes. The allowed regions for the corresponding ratios of (complex) isospin amplitudes and a 2 /a 1… (More)
We review current status of theoretical predictions of lifetimes of heavy hadrons in heavy-quark expansion. We present a calculation of subleading 1/m b corrections to spectator effects in the ratios of beauty hadron lifetimes. We find that these effects are sizable and should be taken into account in systematic analyses of heavy hadron lifetimes. In… (More)
The motivation most often cited in searches for D 0 − D 0 mixing and CP-violation in charm system lies with the possibility of observing a signal from New Physics which dominates that from the Standard Model. We review recent theoretical predictions and experimental constraints on D 0 −D 0 mixing parameters, concentrating on possible effects of New Physics.
We present the first general analysis of New Physics contributions to the D0-D[over ](0) lifetime difference (equivalently DeltaGamma(D)). We argue that New Physics (NP) contributions to |DeltaC|=1 processes can dominate the lifetime difference in the flavor SU(3) limit. We provide several specific examples of models that produce sizable effects in… (More)