Social preferences, accountability, and wage bargaining

We assess the extent of preferences for employment in a collective wage bargaining situation with heterogeneous workers. We vary the size of the union and introduce a treatment mechanism transforming the voting game into an individual allocation task. Our results show that highly productive workers do not take employment of low productive workers into account when making wage proposals, regardless of whether insiders determine the wage or all workers. The level of pro-social preferences is small in the voting game, while it increases as the game is transformed into an individual allocation task. We interpret this as an accountability effect

Turfgrass research report 1995

Postemergence herbicide efficacy on crabgrass / John R. Street and Renee M. Stewart -- Preemergence herbicide efficacy on crabgrass / John R. Street and Renee M. Stewart --Preemergent common chickweed weed control evaluation / William Pound -- Preemergent purple dead nettle weed control evaluation / William Pound -- General turfgrass broadleaf weed control evaluation / William Pound -- Finale/Roundup herbicide demonstration evaluation / William Pound -- Ground ivy control evaluation / William Pound -- Manage yellow nutsedge control evaluation / William Pound -- Alternative Turflon solvent tolerance evaluation / William Pound -- Wild violet control evaluation / William Pound --Leaf spot study, 1995 / Joe Rimelspach, Karl Danneberger and Jill Taylor -- Leaf spot control study - Galena, Ohio / Joe Rimelspach, Karl Danneberger and Jill Taylor -- Red thread control study, 1995 / Joe Rimelspach, Karl Danneberger -- Brown patch study, 1995 / Joe Rimelspach, Karl Danneberger, Joseph Vagnier and Jill Taylor -- Brown patch (Rhizoctonia solani) curative study / Joe Rimelspach, Karl Danneberger and Jill Taylor -- Preventive dollar spot (Sclerotinia homoeocarpa) control study, 1995 / Joe Rimelspach, Karl Danneberger, Joseph Vagnier and Jill Taylor -- Take-All control study / Joe Rimelspach and Karl Danneberger -- Yellow tuft study, 1995 / Joe Rimelspach, Karl Danneberger, Joseph Vagnier and Jill Taylor -- Summer patch control study / Rob Golembiewski, Joe Rimelspach and Karl Danneberger -- Sentinel and Daconil Ultrex gallonage study: influence on dollar spot control / Karl Danneberger and Jill Taylor -- Pink snow mold control study, 1994-1995 / Jill Taylor, Joe Rimelspach and Karl Danneberger -- Control of black cutworm, Agrotis ipsilon (Hufnagel), and sod webworms (Pyralidae: Crambinae) on short cut bentgrass, Agrostis palustris Hudson-1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Control of black cutworm, Agrotis ipsilon (Hufnagel), and sod webworms (Pyralidae: Crambinae) on short cut bentgrass, Agrostis palustris Hudson using spinosad formulations -1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Applications of insecticides for control of second generation hairy chinch bugs in turfgrass -1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Preventive application of insecticides for control of black turfgrass Ataenius larvae on golf course fairways, 1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Spring application of chemical and biological insecticides for control of overwintered white grubs in turfgrass, 1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Influence of post-treatment irrigation on the efficacy of RH 0345 and Merit applied at the time of egg hatch for control of Japanese beetle larvae in turf, 1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Application of various insecticides for preventive control of Japanese Beetle larvae in turfgrass, 1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Chemical and biological insecticides applied for control of white grubs in turfgrass, 1995 / David J. Shetlar, Harry D. Niemczyk and Kevin T. Power -- Nitrogen source, rate, and timing effect on Kentucky bluegrass / John R. Street and Renee M. Stewart -- Natural organic source evaluation on a Kentucky bluegrass-perennial ryegrass mixture / John R. Street and Renee M. Stewart -- Nitrogen source, rate, and timing effect on Kentucky bluegrass / John R. Street and Renee M. Stewart -- Polymer-coated nitrogen source effect on Kentucky bluegrass / John R. Street and Renee M. Stewart -- 1993 NTEP bentgrass test (fairway/tee) / Jill A. Taylor -- 1993 NTEP fineleaf fescue test / Jill Taylor -- 1994 NTEP perennial ryegrass test / Jill Taylor -- 'Primo' growth regulator evaluation on creeping bentgrass / William Pound -- Bermudagrass management study / John Street and Jill Taylor -- Electrophoretic evaluation of esterase isozymes from turfgrass seed blends and mixtures / G. E. Bell, M. B. McDonald Jr. and T. K. Danneberger -- Computer Imaging of Electrophoretic Gels / G. E. Bell, M. B. McDonald Jr., T. K. Danneberger and S. K. St. Martin -- Evaluation of Kentucky bluegrass blends using isoelectric focusing and computer imaging / G. E. Bell, M. B. McDonald Jr. and T. K. Danneberger -- Identification of RAFLP markers in perennial ryegrass / Patricia M. Sweeney and Karl Danneberger -- RAPD analysis of dry turfgrass seed / Patricia Sweeney, Robert Golembiewski and Karl Danneberge

Identification of Radiopure Titanium for the LZ Dark Matter Experiment and Future Rare Event Searches

The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a detector containing a total of 10 tonnes of liquid xenon within a double-vessel cryostat. The large mass and proximity of the cryostat to the active detector volume demand the use of material with extremely low intrinsic radioactivity. We report on the radioassay campaign conducted to identify suitable metals, the determination of factors limiting radiopure production, and the selection of titanium for construction of the LZ cryostat and other detector components. This titanium has been measured with activities of $^{238}$U$_{e}$~$<$1.6~mBq/kg, $^{238}$U$_{l}$~$<$0.09~mBq/kg, $^{232}$Th$_{e}$~$=0.28\pm 0.03$~mBq/kg, $^{232}$Th$_{l}$~$=0.25\pm 0.02$~mBq/kg, $^{40}$K~$<$0.54~mBq/kg, and $^{60}$Co~$<$0.02~mBq/kg (68\% CL). Such low intrinsic activities, which are some of the lowest ever reported for titanium, enable its use for future dark matter and other rare event searches. Monte Carlo simulations have been performed to assess the expected background contribution from the LZ cryostat with this radioactivity. In 1,000 days of WIMP search exposure of a 5.6-tonne fiducial mass, the cryostat will contribute only a mean background of $0.160\pm0.001$(stat)$\pm0.030$(sys) counts.Comment: 13 pages, 3 figures, accepted for publication in Astroparticle Physic

LHC and lepton flavour violation phenomenology of a left-right extension of the MSSM

We study the phenomenology of a supersymmetric left-right model, assuming minimal supergravity boundary conditions. Both left-right and (B-L) symmetries are broken at an energy scale close to, but significantly below the GUT scale. Neutrino data is explained via a seesaw mechanism. We calculate the RGEs for superpotential and soft parameters complete at 2-loop order. At low energies lepton flavour violation (LFV) and small, but potentially measurable mass splittings in the charged scalar lepton sector appear, due to the RGE running. Different from the supersymmetric 'pure seesaw' models, both, LFV and slepton mass splittings, occur not only in the left- but also in the right slepton sector. Especially, ratios of LFV slepton decays, such as Br(${\tilde\tau}_R \to \mu \chi^0_1$)/Br(${\tilde\tau}_L \to \mu \chi^0_1$) are sensitive to the ratio of (B-L) and left-right symmetry breaking scales. Also the model predicts a polarization asymmetry of the outgoing positrons in the decay $\mu^+ \to e^+ \gamma$, A ~ [0,1], which differs from the pure seesaw 'prediction' A=1$. Observation of any of these signals allows to distinguish this model from any of the three standard, pure (mSugra) seesaw setups.Comment: 43 pages, 17 figure

Measurement of the Strong Coupling Constant from Inclusive Jet Production at the Tevatron pˉp\bar pp Collider

We report a measurement of the strong coupling constant, $\alpha_s(M_Z)$, extracted from inclusive jet production in $p\bar{p}$ collisions at $\sqrt{s}=$1800 GeV. The QCD prediction for the evolution of $\alpha_s$ with jet transverse energy $E_T$ is tested over the range 40<$E_T$<450 GeV using $E_T$ for the renormalization scale. The data show good agreement with QCD in the region below 250 GeV. In the text we discuss the data-theory comparison in the region from 250 to 450 GeV. The value of $\alpha_s$ at the mass of the $Z^0$ boson averaged over the range 40<$E_T$<250 GeV is found to be $\alpha_s(M_{Z})= 0.1178 \pm 0.0001{(\rm stat)}^{+0.0081}_{-0.0095}{\rm (exp. syst)}$. The associated theoretical uncertainties are mainly due to the choice of renormalization scale (^{+6%}_{-4%}) and input parton distribution functions (5%).Comment: 7 pages, 3 figures, using RevTeX. Submitted to Physical Review Letter

Measurement of the ttˉproductioncrosssectionint\bar{t} production cross section in p\bar{p}collisionsat collisions at \sqrt{s}$ = 1.8 TeV

We update the measurement of the top production cross section using the CDF detector at the Fermilab Tevatron. This measurement uses $t\bar{t}$ decays to the final states $e+\nu$+jets and $\mu+\nu$+jets. We search for $b$ quarks from $t$ decays via secondary-vertex identification or the identification of semileptonic decays of the $b$ and cascade $c$ quarks. The background to the $t\bar{t}$ production is determined primarily through a Monte Carlo simulation. However, we calibrate the simulation and evaluate its uncertainty using several independent data samples. For a top mass of 175 $GeV/c^2$, we measure $\sigma_{t\bar{t}}=5.1 \pm 1.5$ pb and $\sigma_{t\bar{t}}=9.2 \pm 4.3$ pb using the secondary vertex and the lepton tagging algorithms, respectively. Finally, we combine these results with those from other $t\bar{t}$ decay channels and obtain $\sigma_{t\bar{t}} = 6.5^{+1.7}_{-1.4}$ pb.Comment: The manuscript consists of 130 pages, 35 figures and 42 tables in RevTex. The manuscript is submitted to Physical Review D. Fixed typo in author lis

Search for Narrow Diphoton Resonances and for gamma-gamma+W/Z Signatures in p\bar p Collisions at sqrt(s)=1.8 TeV

We present results of searches for diphoton resonances produced both inclusively and also in association with a vector boson (W or Z) using 100 pb^{-1} of p\bar p collisions using the CDF detector. We set upper limits on the product of cross section times branching ratio for both p\bar p\to\gamma\gamma + X and p\bar p\to\gamma\gamma + W/Z. Comparing the inclusive production to the expectations from heavy sgoldstinos we derive limits on the supersymmetry-breaking scale sqrt{F} in the TeV range, depending on the sgoldstino mass and the choice of other parameters. Also, using a NLO prediction for the associated production of a Higgs boson with a W or Z boson, we set an upper limit on the branching ratio for H\to\gamma\gamma. Finally, we set a lower limit on the mass of a `bosophilic' Higgs boson (e.g. one which couples only to \gamma, W, and Z$ bosons with standard model couplings) of 82 GeV/c^2 at 95% confidence level.Comment: 30 pages, 11 figure

Search for the Supersymmetric Partner of the Top-Quark in ppˉp \bar{p} Collisions at s=1.8TeV\sqrt{s} = 1.8 {\rm TeV}

We report on a search for the supersymmetric partner of the top quark (stop) produced in $t \bar{t}$ events using $110 {\rm pb}^{-1}$ of $p \bar{p}$ collisions at $\sqrt{s} = 1.8 {\rm TeV}$ recorded with the Collider Detector at Fermilab. In the case of a light stop squark, the decay of the top quark into stop plus the lightest supersymmetric particle (LSP) could have a significant branching ratio. The observed events are consistent with Standard Model $t \bar{t}$ production and decay. Hence, we set limits on the branching ratio of the top quark decaying into stop plus LSP, excluding branching ratios above 45% for a LSP mass up to 40 {\rm GeV/c}$^{2}$.Comment: 11 pages, 4 figure