46 research outputs found
Comportamiento de factores de riesgo (fr) en pacientes con trastornos del estado del ánimo (tea), atendidos en la unidad mental del hospital universitario de neiva (hun) 1995-2000
Determinar la influencia de FR para los TEA en pacientes atendidos en el HUN 1995-2001
The Hubbard model within the equations of motion approach
The Hubbard model has a special role in Condensed Matter Theory as it is
considered as the simplest Hamiltonian model one can write in order to describe
anomalous physical properties of some class of real materials. Unfortunately,
this model is not exactly solved except for some limits and therefore one
should resort to analytical methods, like the Equations of Motion Approach, or
to numerical techniques in order to attain a description of its relevant
features in the whole range of physical parameters (interaction, filling and
temperature). In this manuscript, the Composite Operator Method, which exploits
the above mentioned analytical technique, is presented and systematically
applied in order to get information about the behavior of all relevant
properties of the model (local, thermodynamic, single- and two- particle ones)
in comparison with many other analytical techniques, the above cited known
limits and numerical simulations. Within this approach, the Hubbard model is
shown to be also capable to describe some anomalous behaviors of the cuprate
superconductors.Comment: 232 pages, more than 300 figures, more than 500 reference
Improved measurement of CP violation parameters in Bs0→J/ψK+K− decays in the vicinity of the ϕ(1020) resonance
The decay-time-dependent
C
P
asymmetry in
B
0
s
→
J
/
ψ
(
→
μ
+
μ
−
)
K
+
K
−
decays is measured using proton-proton collision data, corresponding to an integrated luminosity of
6
fb
−
1
, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000
B
0
s
signal decays with an invariant
K
+
K
−
mass in the vicinity of the
ϕ
(
1020
)
resonance, the
C
P
-violating phase
ϕ
s
is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the
B
0
s
−
¯
B
0
s
system,
Δ
Γ
s
, and the difference of the average
B
0
s
and
B
0
meson decay widths,
Γ
s
−
Γ
d
. The values obtained are
ϕ
s
=
−
0.039
±
0.022
±
0.006
rad
,
Δ
Γ
s
=
0.0845
±
0.0044
±
0.0024
ps
−
1
, and
Γ
s
−
Γ
d
=
−
0.005
6
+
0.0013
−
0.0015
±
0.0014
ps
−
1
, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase
ϕ
s
is also measured independently for each polarization state of the
K
+
K
−
system and shows no evidence for polarization dependence
Comportamiento de factores de riesgo (fr) en pacientes con trastornos del estado del ánimo (TEA), atendidos en la Unidad Mental del Hospital Universitario de Neiva (HUN) 1995-2000
Determinar la influencia de FR para los TEA en pacientes atendidos en el HUN 1995-2001
Comportamiento de factores de riesgo (fr) en pacientes con trastornos del estado del ánimo (tea), atendidos en la unidad mental del hospital universitario de neiva (hun) 1995-2000
Determinar la influencia de FR para los TEA en pacientes atendidos en el HUN 1995-2001