نتایج جستجو برای: as societal sources
تعداد نتایج: 5770333 فیلتر نتایج به سال:
The B̄ → Kγ branching fraction is predicted using heavy quark spin symmetry at large recoil to relate the tensor and (axial-)vector form factors, using heavy quark flavor symmetry to relate the B decay form factors to the measured D → Kl̄ν form factors, and extrapolating the semileptonic B decay form factors to large recoil assuming nearest pole dominance. This prediction agrees with data surpris...
The focus of our considerations is the B-meson system, which will provide stringent tests of the Kobayashi– Maskawa mechanism of CP violation in this decade. After a classification of the main possible strategies to achieve this goal, we discuss the status of the B-factory benchmark modes in view of the current experimental data. We shall then turn to the “El Dorado” for B-decay studies at hadr...
The time dependence of B d B d mixing has been observed in events containing high-P t leptons using a highly inclusive v ertexing method to determine the B decay position. The initial state B hadron avor was determined using the large forward-backward asymmetry provided by the highly polarized electron beam of SLC in combination with a jet charge technique. From a sample of 150,000 hadronic Z d...
We report new measurements of the differential and total branching ratios for inclusive B decay to D, D and D and the first measurement of the same quantities for inclusive B decay to D. Here B is the mixture of Bd and Bu from Υ(4S) decay. Furthermore, since more than one charm particle (or antiparticle) of the same kind can be produced in B decay, here “inclusive B branching ratio” is used to ...
We study the two-body and three-body charmful baryonic B decays: B 0 → Λc p̄ and B → Λc p̄ π(ρ). The factorizable W -exchange contribution to B 0 → Λc p̄ is negligible. Applying the bag model to evaluate the baryon-to-baryon weak transition matrix element, we find B(B → Λc p̄) <∼ 2.5 × 10−5|gB0pΣ+b /8| 2 with gB0pΣ+ b being a strong coupling for the decay Σb → B 0 p and hence the predicted branchin...
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OBJECTIVES The objective of this study was to estimate the societal costs of prescription opioid abuse, dependence, and misuse in the United States. METHODS Costs were grouped into three categories: health care, workplace, and criminal justice. Costs were estimated by 1) quantity method, which multiplies the number of opioid abuse patients by cost per opioid abuse patient; and 2) apportionmen...
The wave shape, intensity, and time course of the flash were examined with the aid of electronic operations in order to characterize the luminescence response and examine the in vivo dynamics of the light reaction. The most prominent single component of the flash shape is its exponential decay, beginning several milliseconds after the intensity maximum, with a mean rate constant at 23 degrees C...
Four experiments examined the ability of respondents to identify letters that were displayed on an LED array with flashes lasting little more than a microsecond. The first experiment displayed each letter with a single, simultaneous flash of all the dots forming the letter and established the relation of flash intensity to the probability of letter identification. The second experiment displaye...
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