272 research outputs found
Patient Mistreatment and New Nurse Adjustment: The Role of Rumination and Work Engagement
During organizational entry, newcomers often draw upon internal resources like coworkers and supervisors to navigate their roles. Could external interactions with customers or patients hold the key to newcomer adjustment in certain job contexts? Our study, rooted in the conservation of resources theory, identifies a critical link between mistreatment from external parties and newcomer adjustment – a connection that is explained by rumination and work engagement. Through two studies involving new nurses in China (Study 1: Four-wave cross-lagged panel
design, N = 181; Study 2: Four-wave time-lagged design, N = 198), we uncover that
mistreatment from patients results in rumination among newcomers, leading to diminished task mastery and role clarity, as mediated by reduced work engagement. This ripple effect of external
mistreatment persists even when accounting for internal mistreatment (abusive supervision and coworker incivility). Our results illustrate how negative interactions with external entities can hinder newcomer adjustment – a revelation with far-reaching implications for practitioners and future research
decays and the weak phase angle
The large branching ratios for decays as observed by the CLEO
Collaboration indicate that penguin interactions contribute a major part to the
decay rates and provide an interference between the Cabibbo-suppressed tree and
penguin contributions resulting in a CP-asymmetry between the and
its charge conjugate mode. The CP-averaged decay rates depend also on the weak
phase and give us a determination of this phase. In this talk, I would
like to report on a recent analysis of decays using factorisation
model with final state interaction phase shift included. We find that
factorisation seems to describe qualitatively the latest CLEO data. We also
obtain a relation for the branching ratios independent of the strength of the
strong penguin interactions. This relation gives a central value of for ,
somewhat smaller than the latest CLEO measurement. We also find that a ratio
obtained from the CP-averaged decay rates could be used to test
the factorisation model and to determine the weak angle with more
precise data, though the latest CLEO data seem to favor in the range
.Comment: Talk given at the QCD Euroconference 00, Montpellier 6-12 July 2000,
10 pages,4 figure
The Riddle of Polarization in Transitions
Measurements of polarization fractions in transitions, with a
light vector meson, show that the longitudinal amplitude dominates in , , and decays and
not in the penguin induced decays , .
We study the effect of rescattering mediated by charmed resonances, finding
that in it can be responsible of the suppression of the
longitudinal amplitude. For the decay we find that the
longitudinal fraction cannot be too large without invoking new effects.Comment: LaTex, 14 pages, 3 figure
Non-factorizable Contributions to Decays
We investigate to what extent the experimental information on
branching fractions and CP asymmetries can be used to better understand the QCD
dynamics in these decays. For this purpose we decompose the independent isospin
amplitudes into factorizable and non-factorizable contributions. The former can
be estimated within the framework of QCD factorization for exclusive
decays. The latter vanish in the heavy-quark limit, , and are
treated as unknown hadronic parameters. We discuss at some length in which way
the non-factorizable contributions are treated in different theoretical and
phenomenological frameworks. We point out the potential differences between the
phenomenological treatment of power-corrections in the ``BBNS approach'', and
the appearance of power -suppressed operators in soft-collinear effective
theory (SCET). On that basis we define a handful of different (but generic)
scenarios where the non-factorizable part of isospin amplitudes is parametrized
in terms of three or four unknowns, which can be constrained by data. We also
give some short discussion on the implications of our analysis for decays. In particular, since non-factorizable QCD effects in
may be large, we cannot exclude sizeable non-factorizable effects, which
violate flavour symmetry, or even isospin symmetry (via long-distance
QED effects). This may help to explain certain puzzles in connection with
isospin-violating observables in decays.Comment: published version, minor correction
B -> K1 gamma and tests of factorization for two-body non leptonic Bdecays with axial-vector mesons
The large branching ratio for B-> K1 gamma recently measured at Belle implies
a large B -> K1 transition form factor and large branching ratios for non
leptonic B decays involving an axial-vector meson. In this paper we present an
analysis of two-body B decays with an axial-vector meson in the final state
using naive factorization and the B -> K1 form factors obtained from the
measured radiative decays. We find that the predicted B -> J/psi K1 branching
ratio is in agreement with experiment. We also suggest that the decay rates of
B -> K1 pi, B -> a1 K and B -> b1 K could be used to test the factorization
ansatz.Comment: 8 pages; 7 new references included and a comment on K2(1430) in the
final state adde
Hadronic Charmed Meson Decays Involving Axial Vector Mesons
Cabibbo-allowed charmed meson decays into a pseudoscalar meson and an
axial-vector meson are studied. The charm to axial-vector meson transition form
factors are evaluated in the Isgur-Scora-Grinstein-Wise quark model. The dipole
momentum dependence of the transition form factor and the presence of
a sizable long-distance -exchange are the two key ingredients for
understanding the data of . The mixing angle of
the strange axial-vector mesons is found to be or
from decays. The study of decays excludes the positive mixing-angle
solutions. It is pointed out that an observation of the decay at the level of will rule out
and favor the solution .
Though the decays are color suppressed, they are
comparable to and even larger than the color-allowed counterparts: and . The finite width effect of the axial-vector resonance is
examined. It becomes important for in particular when its width is
near 600 MeV.Comment: 19 page
Nonfactorizable contributions in B decays to charmonium: the case of
Nonleptonic to charmonium decays generally show deviations from the
factorization predictions. For example, the mode has
been experimentally observed with sizeable branching fraction while its
factorized amplitude vanishes. We investigate the role of rescattering effects
mediated by intermediate charmed meson production in this class of decay modes,
and consider with the meson.
Using an effective lagrangian describing interactions of pairs of heavy-light
mesons with a quarkonium state, we relate this mode to the
analogous mode with in the final state. We find large enough to be measured at the factories, so that this decay
mode could be used to study the poorly known .Comment: RevTex, 16 pages, 2 eps figure
decays: a model estimation
In this paper, we investigate the vertex corrections and spectator hard
scattering contributions to decays, which has no leading
contribution from naive factorization scheme. A non-zero binding energy
is introduced to regularize the infrared divergence of the vertex
part. The spectator diagrams also contain logarithmic and linear infrared
divergences, for which we adopt a model dependent parametrization. If we
neglect possible strong phases in the hard spectator contributions, we obtain a
too small branching ratio for while too large one for
, as can be seen from the ratio of the branching ratio of to that of , which is predicted to be
in our model, while experimentally it should be about
0.1 or even smaller. But a closer examination shows that, assuming large strong
phases difference between the twist-2 and twist-3 spectator terms, together
with a slightly larger spectator infrared cutoff parameter , it is
possible to accommodate the experimental data. This shows that, for decays with no factorizable contributions, QCDF seems capable of
producing decay rates close to experiments, in contrast to the
decay which is dominated by the factorizable contributions.Comment: 13 pages, 1 figure, the version to appear in PL
The CP violating asymmetry in decays
We analyze the asymmetry in the partial widths for the decays (), which results from the
interference of the nonresonant decay amplitude with the resonant amplitude for
followed by the decay . The CP violating phase can be extracted from the measured
asymmetry. We find that the partial width asymmetry for is about , and about for , while it is somewhat smaller for and . Potential sources of uncertainties
in these results, primarily coming from poorly known input parameters, are
discussed.Comment: 12 pages, latex, 1 figure, submitted to Phis. Lett.
Final state interactions in the decay
In this article, we study the final-state rescattering effects in the decay
, the numerical results indicate the corrections are
comparable with the contribution from the naive factorizable amplitude, and the
total amplitudes can accommodate the experimental data.Comment: 11 pages, 1 figure, revised version, to appear in EPJ
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