2,334 research outputs found
Does adverse selection justify government intervention in loan markets?
No full textBank supervision ; Credit
Limited commitment and central bank lending
No full textLenders of last resort ; Banks and banking, Central
Model-independent extraction of {pipe}Vtq{pipe} matrix elements from top-quark measurements at hadron colliders
No full textCurrent methods to extract the quark-mixing matrix element {pipe}Vtb{pipe} from single-top-production measurements assume that {pipe}Vtb{pipe}>>{pipe}Vtd{pipe},{pipe}Vts{pipe}: top quarks decay into b quarks with 100 % branching fraction, s-channel single-top production is always accompanied by a b quark and initial-state contributions from d and s quarks in the t-channel production of single top quarks are neglected. Triggered by a recent measurement of the ratio, 0. 90 ±0. 04 performed by the D0 collaboration, we consider a {pipe}Vtb{pipe} extraction method that takes into account non zero d- and s-quark contributions both in production and decay. We propose a strategy that allows to extract consistently and in a model-independent way the quark-mixing matrix elements {pipe}Vtd{pipe}, {pipe}Vts{pipe}, and {pipe}Vtb{pipe} from the measurement of R and from single-top measured event yields. As an illustration, we apply our method to the Tevatron data using a CDF analysis of the measured single-top event yield with two jets in the final state, one of which is identified as a b-quark jet. We constrain the {pipe}Vtq{pipe} matrix elements within a four-generation scenario by combining the results with those obtained from direct measurements in flavor physics and determine the preferred range for the top-quark decay width within different scenarios. © 2012 Springer-Verlag / Società Italiana di Fisica
Stored value cards: costly private substitutes for government currency
No full textStored-value cards ; Smart cards
Lacker, William H. (Birth, 1882-08-07)
No full textAddress: 127 Mulberry St.4683/Pg.141/1882/M W/Amer/Amer/Carolina Gobrecht, Mid.Original record filed in drawer labeled 'Lacey-Lamphrey'
The Fed's entry into check clearing reconsidered
No full textCheck collection systems ; Federal Reserve System
Model-independent extraction of |V_{tq}| matrix elements from top-quark measurements at hadron colliders
No full textCurrent methods to extract the quark-mixing matrix element from single-top production measurements assume that : top quarks decay into quarks with 100% branching fraction, s-channel single-top production is always accompanied by a quark and initial-state contributions from and quarks in the -channel production of single top quarks are neglected. Triggered by a recent measurement of the ratio performed by the D0 collaboration, we consider a extraction method that takes into account non zero d- and s-quark contributions both in production and decay. We propose a strategy that allows to extract consistently and in a model-independent way the quark mixing matrix elements , , and from the measurement of and from single-top measured event yields. As an illustration, we apply our method to the Tevatron data using a CDF analysis of the measured single-top event yield with two jets in the final state one of which is identified as a -quark jet. We constrain the matrix elements within a four-generation scenario by combining the results with those obtained from direct measurements in flavor physics and determine the preferred range for the top-quark decay width within different scenarios
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