BB decay anomalies from nonabelian local horizontal symmetry

Recent anomalies in $B\to K^{(*)}\ell\ell$ meson decays are consistent with exchange of a heavy $Z'$ vector boson. Here we try to connect such new physics to understanding the origin of flavor, by gauging generation number. Phenomenological and theoretical considerations suggest that the smallest viable flavor symmetry (not including any extra U(1) factors) is chiral ${\rm SU(3)}_L\times{\rm SU(3)}_R$, which acts only on generation indices and does not distinguish between quarks and leptons. Spontaneous breaking of the symmetry gives rise to the standard model Yukawa matrices, and masses for the 16 $Z'$-like gauge bosons, one of which is presumed to be light enough to explain the $B\to K^{(*)}\ell\ell$ anomalies. We perform a bottom-up study of this framework, showing that it is highly constrained by LHC dilepton searches, meson mixing, $Z$ decays and CKM unitarity. Similar anomalies are predicted for semileptonic decays of $B$ to lighter mesons, with excesses in the $ee,\tau\tau$ channels and deficits in $\mu\mu$, but no deviation in $\nu\nu$. The lightest $Z'$ mass is $\lesssim 6\,$TeV if the gauge coupling is $\lesssim 1$.Comment: 13 pages, 4 figures; v2: minor corrections and improvements, references added; v3: corrected fig.1, published versio

Unemployment Insurance and Reservation Wages

The present paper examines the reservation wages reported by a largesample of unemployed individuals in the United States in May 1976. The majorityof unemployedindividuals report reservation wages that are at least as highas the wage they were paid on their last job. Approximately one-fourth of alljob seekers required a wage that is at least 10 percent higher than the wage ontheir previous job.Our econometric evidence shows that the level of unemployment benefitsrelative to previous wages has a powerful effect on the individual's reservation wage. A ten percent increase in the U.I. replacement ratio increases the reservation wage by about percent for job losers who are not on layoff and bysomewhat less for other unemployed groups. Separate regressions to analyze the high reservation wage per se show that a ten percent increase in the U.I. replacement ratio also increases by about four percentage points the probability that an unemployed individual will require a wage increase of 10 percent or more.These estimates imply that reducing net unemployment insurance benefits (by lowering gross benefits or by taxing unemployment benefits) could significantly lower the average duration of unemployment and the relative number of long duration spells of unemployment. Because of the non-linear response of the unemployment duration to the reservation wage, reducing a high unemployment insurance ratio by ten percentage points is likely to have a greater impact on unemployment than reducing a low unemployment insurance ratio by ten percentage points.

State and Local Taxes and the Rate of Return on Nonfinancial Corporate Capital (revised as W0740)

Although states and localities collect a substantial amount of revenue from corporate profits taxes and property taxes on corporate capital, these taxes have been inadequately reflected in previous calculations of the effective corporate tax rate and the pretax rate of return to corporate capital. The present study focuses on non-financial corporations and begins by estimating the profits taxes and property taxes which these corporations pay to state and local governments. These estimates are then used to calculate the pretax rate of return on non-financial corporate capital; the results suggest that the conventional omission of state-local property taxes leads to an understatement of this rate of return by about one percentage point. The effective tax rate on non-financial corporate profits is also computed, taking account of state-local taxes. These taxes amount to approximately sixteen percent of the pretax profits of non-financial corporations. The total effective tax rate on these corporations is shown to have risen substantially during the past two decades; it averaged more than seventy percent in the most recent five-year period. The series for the rate of return and effective tax rate are used to compute the real after-tax rate of return on non-financial corporate capital. The calculations show that this number has declined recently, reaching 2.3 percent in 1979. This is to be contrasted with after-tax returns of over five percent which prevailed during the mid-1960s.

The Effect of Rewards and Sanctions in Provision of Public Goods

A growing number of field and experimental studies focus on the institutional arrangements by which individuals are able to solve collective action problems. Important in this research is the role of reciprocity and institutions that facilitate cooperation via opportunities for monitoring, sanctioning, and rewarding others. Sanctions represent a cost to both the participant imposing the sanction and the individual receiving the sanction. Rewards represent a zero sum transfer from participants giving to those receiving rewards. We contrast reward and sanction institutions in regard to their impact on cooperation and efficiency in the context of a public goods experiment.

Illinois Forest Game Investigations W-87-R-9, Quarterly Federal Aid Performance Report 1 July - 30 September 1987

Quarterly Federal Aid Performance Report W-87-R-9, 1 July - 30 September 1987; Study No. VII-D Harvest Strategies for Illinois Deer Herds, Urban Deer StudyReport issued on: September 30, 1987INHS Technical Report prepared for unspecified recipien

The Effective Tax Rate and the Pretax Rate of Return

This paper presents new estimates of the taxes paid on nonfinancial corporate capital, on the pretax rate of return to capital, and on the effective tax rate. The basic time series show that both the pretax rate of return and the effective tax rate have varied substantially in the past quarter century. An explicit analysis indicates that, after adjusting for different aspects of the business cycle, pretax profitability was between one and 1.5 percentage points lower in the 1970's than in the 1960's. The rate of profitability in the 1960's was also about one-half of a percentage point greater than the profitability in the 7 years of the 1950's after the Korean war. Changes in productivity growth, in inflation, in relative unit labor costs, and in other variables are all associated with changes in profitability. None of these variables, however, can explain the differences in profitability between the 1950Ts, 1960's and 1970's. Looking at broad decade averages, the effective tax rate and the pretax rate of return move in opposite directions, higher pretax profits occurring when the tax rate is high. There thus appears to have been no tendency for pretax profits to vary in a way that offsets differences in effective tax rates.

Combination of geodetic observations and models for glacial isostatic adjustment fields in Fennoscandia

We demonstrate a new technique for using geodetic data to update a priori predictions for Glacial Isostatic Adjustment (GIA) in the Fennoscandia region. Global Positioning System (GPS), tide gauge, and Gravity Recovery and Climate Experiment (GRACE) gravity rates are assimilated into our model. The technique allows us to investigate the individual contributions from these data sets to the output GIA model in a self-consistent manner. Another benefit of the technique is that we are able to estimate uncertainties for the output model. These are reduced with each data set assimilated. Any uncertainties in the GPS reference frame are absorbed by reference frame adjustments that are estimated as part of the assimilation. Our updated model shows a spatial pattern and magnitude of peak uplift that is consistent with previous models, but our location of peak uplift is slightly to the east of many of these. We also simultaneously estimate a spatially averaged rate of local sea level rise. This regional rate (similar to 1.5 mm/yr) is consistent for all solutions, regardless of which data sets are assimilated or the magnitude of a priori GPS reference frame constraints. However, this is only the case if a uniform regional gravity rate, probably representing errors in, or unmodeled contributions to, the low-degree harmonic terms from GRACE, is also estimated for the assimilated GRACE data. Our estimated sea level rate is consistent with estimates obtained using a more traditional approach of direct "correction" using collocated GPS and tide gauge site

Interannual variability of Mars South Polar cap

Telescopic data on the twentieth century regressions of Mars' south polar cap were reexamined for evidence of interannual variability. Several regressions, particularly that of 1956, are found to differ significantly from the mean. The possibility of correlations with major dust storms is explored

The electronic Hamiltonian for cuprates

A realistic many-body Hamiltonian for the cuprate superconductors should include both copper d and oxygen p states, hopping matrix elements between them, and Coulomb energies, both on-site and inter-site. We have developed a novel computational scheme for deriving the relevant parameters ab initio from a constrained occupation local density functional. The scheme includes numerical calculation of appropriate Wannier functions for the copper and oxygen states. Explicit parameter values are given for La2CuO4. These parameters are generally consistent with other estimates and with the observed superexchange energy. Secondly, we address whether this complicated multi-band Hamiltonian can be reduced to a simpler one with fewer basis states per unit cell. We propose a mapping onto a new two-band effective Hamiltonian with one copper d and one oxygen p derived state per unit cell. This mapping takes into account the large oxygen-oxygen hopping given by the ab initio calculations