9,189 research outputs found
New Technologies, Workplace Organisation and the Age Structure of the Workforce: Firm-Level Evidence
This paper investigates the relationships between new technologies, innovative workplace practices and the age structure of the workforce in a sample of French manufacturing firms. We find evidence that the wage bill share of older workers is lower in innovative firms and that the opposite holds for younger workers. This age bias is also evidenced within occupational groups, thus suggesting that skills do not completely protect workers against the labour market consequences of ageing. More detailed analysis of employment inflows and outflows shows that new technologies essentially affect older workers through reduced hiring opportunities, whereas organisational innovations mainly increase their probability of exit. This suggests that some skill obsolescence may be at work in our sample.new work practices, technology, older workers, labour demand
CP Violation Studies at Tevatron
We present an overview of a few recent results related to CP-violation from
the Tevatron. First, we discuss a measurement of the dimuon charge asymmetry
from D{\O}that extracts the CP-violation parameter of \Bo mixing and decay.
This is followed by the CDF measurement of the CP-violating asymmetry in
\bdkpi decays. Finally we give the CDF result on the ratio Comment: 4 pages. Talk given at BEACH 2006, Lancaster, Englan
Multichannel calculation of the very narrow and the very broad
The narrow (2317) and broad (2300-2400) charmed
scalar mesons and their radial excitations are described in a coupled-channel
quark model that also reproduces the properties of the light scalar nonet. All
two-meson channels containing ground-state pseudoscalars and vectors are
included. The parameters are chosen fixed at published values, except for the
overall coupling constant , which is fine-tuned to reproduce the
(2317) mass, and a damping constant for subthreshold
contributions. Variations of and (2300-2400) pole
postions are studied for different values. Calculated cross sections
for -wave and scattering, as well as resonance pole positions,
are given for the value of that fits the light scalars. The thus
predicted radially excited state (2850), with a width of about 50
MeV, seems to have been observed already.Comment: 3 pages, EPJ LaTeX, 2 Postscript figures, 1 table; parallel talk at
the IVth International Conference on Quarks and Nuclear Physics (QNP06),
Madrid, 5-10 June 200
Understanding the newly observed Y(4008) by Belle
Very recently a new enhancement around 4.05 GeV was observed by Belle
experiment. In this short note, we discuss some possible assignments for this
enhancement, i.e. and molecular state. In these two
assignments, Y(4008) can decay into with comparable
branching ratio with that of . Thus one suggests
high energy experimentalists to look for Y(4008) in channel.
Furthermore one proposes further experiments to search missing channel
, and especially and
, which will be helpful to distinguish and
molecular state assignments for this new enhancement.Comment: 4 pages, 5 figures. Typos correcte
QCD Approach to B->D \pi Decays and CP Violation
The branching ratios and CP violations of the decays, including
both the color-allowed and the color-suppressed modes, are investigated in
detail within QCD framework by considering all diagrams which lead to three
effective currents of two quarks. An intrinsic mass scale as a dynamical gluon
mass is introduced to treat the infrared divergence caused by the soft
collinear approximation in the endpoint regions, and the Cutkosky rule is
adopted to deal with a physical-region singularity of the on mass-shell quark
propagators. When the dynamical gluon mass is regarded as a universal
scale, it is extracted to be around MeV from one of the
well-measured decay modes. The resulting predictions for all
branching ratios are in agreement with the current experimental measurements.
As these decays have no penguin contributions, there are no direct
asymmetries. Due to interference between the Cabibbo-suppressed and the
Cabibbo-favored amplitudes, mixing-induced CP violations are predicted in the
decays to be consistent with the experimental data at
1- level. More precise measurements will be helpful to extract weak
angle .Comment: 21pages,5 figures,3 tables, typos corrected and numerical result for
one of decay channels is improve
Self-Instructional Training to Increase Independent Work Skills in Preschoolers
The effects of cognitive self-instructional training on performance of independent work skills in three impulsive, disruptive preschool children was investigated using a multiple-baseline design across subjects. Behavioral observations of the children in the classroom indicated that, after the introduction of self-instructional training, there was an increase in on-task behavior and work completion for the subjects and an increase in accuracy of work for all three children. A second self-instructional training input had little effect on the children\u27s classroom behavior; however, subsequent introduction of a mild incentive procedure directly into the classroom resulted in further improvement in two subjects rates of on-task behavior, as well as increases in accuracy and work completion for all three children. The subjects also increased their mean response latency and accuracy on the Matching Familiar Figures Test in comparison to other children in the preschool classroom
An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
The recently measured B -> tau nu branching ratio allows to test the Standard
Model by probing virtual effects of new heavy particles, such as a charged
Higgs boson. The accuracy of the test is currently limited by the experimental
error on BR(B -> tau nu) and by the uncertainty on the parameters fB and |Vub|.
The redundancy of the Unitarity Triangle fit allows to reduce the error on
these parameters and thus to perform a more precise test of the Standard Model.
Using the current experimental inputs, we obtain BR(B -> tau nu)_SM = (0.84 +-
0.11)x10^{-4}, to be compared with BR(B -> tau nu)_exp = (1.73 +-
0.34)x10^{-4}. The Standard Model prediction can be modified by New Physics
effects in the decay amplitude as well as in the Unitarity Triangle fit. We
discuss how to disentangle the two possible contributions in the case of
minimal flavour violation at large tan beta and generic loop-mediated New
Physics. We also consider two specific models with minimal flavour violation:
the Type-II Two Higgs Doublet Model and the Minimal Supersymmetric Standard
Model.Comment: 7 pages, 13 figures, 1 table. v2: added references and discussion of
B -> D tau nu in the 2HDM. v3: added Bs->mumu in the 2HDM. Final version to
appear in PL
The UTfit Collaboration Average of D meson mixing data: Spring 2012
We derive constraints on the parameters , and
that describe meson mixing using all available data, allowing
for CP violation. We also provide posterior distributions and predictions for
observable parameters appearing in physics.Comment: 5 pages, 3 figure
Correlated neutral B meson decays into CP eigenstates
In the two correlated meson decay experiment we propose to measure
intensities relating CP eigenstate () decays on sides,
which will be measurable in future upgrades of KEK and PEP. As a CP-forbidden
transition, we obtain . We calculate in a model independent way all the possible intensities
relating final CP and flavour eigenstate decays. Under CPT-invariance, the
asymmetries for processes related by CP vanish for
and measure linearly. We notice the impossibility to isolate
the sign of \cos (2\bet a) without an independent knowledge of the sign of
. This exhaustion of the possible Golden Plate and flavour
decays provides new observables which may throw light in our present
understanding of CKM physics.Comment: 9 pages, no figures. Minor changes to coincide with published PLB
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