B physics at the Tevatron Troconiz, Jorge F. de
AIP conference proceedings,
10/1998, Letnik:
444, Številka:
1
Journal Article
Recenzirano
Precision B-physics results from the CDF and D0 Collaborations based on data collected during the Tevatron 1992-96 run are presented. In particular we discuss the measurement of the B{sub s} meson ...lifetime, B{sub c} meson observation, and B{sup 0}-B-bar{sup 0} mixing results obtained using time-evolution analyses. Prospects for the next Tevatron run, starting in 1999, are also reported.
A biopharmaceutic–pharmacodynamic model is proposed to characterize the antiproliferative effect of controlled release formulations of cisplatin in cancer cell culture. In vitro release profiles from ...PLGA poly(
d,
l-lactide-co-glycolide) systems were described using a model based on the characterization of two drug release processes: diffusion and matrix degradation. Cytotoxicity data available consisting of the number of survival cells after a continuous exposure to free or encapsulated cisplatin were simultaneously modeled under the Gompertz framework incorporating the drug release model.
The release model parameters showed that particle size was inversely related to the diffusion rate. The antiproliferative effect was described as a function of drug concentrations and exposure times. Two mechanisms were included: (i) an inhibition of cell proliferation, where cisplatin released from PLGA systems was mainly involved, followed by (ii) stimulation of cell death due to cisplatin activity and mediated by the activation of a signal transduction process. Cell accumulation in G2/M phase of the cell cycle followed by the activation of caspase-3, supported both mechanisms.
The selected drug-effect model and its model parameters were independent from the formulation, which makes it a suitable tool to explore
in silico, alternative in vitro and in vivo scenarios to optimize these delivery systems.
The Compact Muon Solenoid (CMS) experiment prepares its Phase-2 upgrade for the high-luminosity era of the LHC operation (HL-LHC). Due to the increase of occupancy, trigger latency and rates, the ...full electronics of the CMS Drift Tube (DT) chambers will need to be replaced. In the new design, the time bin for the digitization of the chamber signals will be of around 1 ns, and the totality of the signals will be forwarded asynchronously to the service cavern at full resolution. The new backend system will be in charge of building the trigger primitives of each chamber. These trigger primitives contain the information at chamber level about the muon candidates position, direction, and collision time, and are used as input in the L1 CMS trigger. The added functionalities will improve the robustness of the system against ageing. An algorithm based on analytical solutions for reconstructing the DT trigger primitives, called Analytical Method, has been implemented both as a software C++ emulator and in firmware. Its performance has been estimated using the software emulator with simulated and real data samples, and through hardware implementation tests. Measured efficiencies are 96 to 98% for all qualities and time and spatial resolutions are close to the ultimate performance of the DT chambers. A prototype chain of the HL-LHC electronics using the Analytical Method for trigger primitive generation has been installed during Long Shutdown 2 of the LHC and operated in CMS cosmic data taking campaigns in 2020 and 2021. Results from this validation step, the so-called Slice Test, are presented.
Phys.Rev.D71:073008,2005 We present a new, completely revised calculation of the muon anomalous
magnetic moment, $a_\mu=(g_{\mu}-2)/2$, comparing it with the more recent
experimental determination of ...this quantity; this furnishes an important test
of theories of strong, weak and electromagnetic interactions. These theoretical
and experimental determinations give the very precise numbers, $$10^{11}\times
a_\mu=\cases{116 591 806\pm50\pm10 ({\rm rad.})\pm30
(\ell\times\ell)\quad\hbox{Th., no $\tau$}\cr 116 591 889\pm49\pm10 ({\rm
rad.})\pm30 (\ell\times\ell)\quad\hbox{Theory, $\tau$}\cr 116 592
080\pm60\quad\hbox{Experiment}.\cr}$$ In the theoretical evaluations, the
first quantity does not, and the second one does, use information from $\tau$
decay. The first errors for the theoretical evaluations include statistical
plus systematic errors; the other ones are the estimated errors due to
incomplete treatment of radiative corrections and the estimated error in the
light-by-light scattering contribution. We thus have a significant mismatch
between theory and experiment. We also use part of the theoretical calculations
to give a precise evaluation of the electromagnetic coupling on the $Z$,
$\bar{\alpha}_{\rm Q.E.D.}(M^2_{Z})$, of the masses and widths of the (charged
and neutral) rho resonances, of the scattering length and effective range for
the P wave in $\pi\pi$ scattering, and of the quadratic radius and second
coefficient of the pion form factor.
The Compact Muon Solenoid (CMS) is a general purpose experiment designed to study proton-proton collisions at the Large Hadron Collider (LHC). The CMS L1 Trigger must select interesting collisions at ...a rate smaller than 100 kHz. The CMS Drift Tube (DT) Barrel Muon Trigger performs a full muon tracking analysis in real time for the CMS L1 Trigger. The DT Trigger motivation, hardware implementation, and performance are presented.
Phys.Rev. D65 (2002) 093002 We perform a new, detailed calculation of the hadronic contributions to the
running electromagnetic coupling, $\bar{\alpha}$, defined on the Z particle (91
GeV). We find ...for the hadronic contribution, including radiative corrections,
$$10^5\times \deltav_{\rm had.}\alpha(M_Z^2)= 2740\pm12,$$ or, excluding the
top quark contribution, $$10^5\times \deltav_{\rm had.}\alpha^{(5)}(M_Z^2)=
2747\pm12.$$
Adding the pure QED corrections we get a value for the running
electromagnetic coupling of $$\bar{\alpha}_{\rm Q.E.D.}(M_Z^2)=
{{1}\over{128.965\pm0.017}}.$$
Phys.Rev. D65 (2002) 093001 We perform a new calculation of the hadronic contributions, $a({\rm
Hadronic})$ to the anomalous magnetic moment of the muon, $a_\mu$. For the low
energy contributions of ...order $\alpha^2$ we carry over an analysis of the pion
form factor $F_\pi(t)$ using recent data both on $e^+e^-\to\pi^+\pi^-$ and
$\tau^+\to \bar{\nu}_\tau \pi^+\pi^0$. In this analysis we take into account
that the phase of the form factor is equal to that of $\pi\pi$ scattering. This
allows us to profit fully from analyticity properties so we can use also
experimental information on $F_\pi(t)$ at spacelike $t$. At higher energy we
use QCD to supplement experimental data, including the recent measurements of
$e^+e^-\to {\rm hadrons}$ both around 1 GeV and near the $\bar{c}c$ threshold.
This yields a precise determination of the $O(\alpha^2)$ and
$O(\alpha^2)+O(\alpha^3)$ hadronic part of the photon vacuum polarization
pieces, $$10^{11}\times a^{(2)}({\rm h.v.p.})=6 909\pm64;\quad 10^{11}\times
a^{(2+3)}({\rm h.v.p.})=7 002\pm66$$ As byproducts we also get the masses and
widths of the $\rho^0, \rho^+$, and very accurate values for the charge radius
and second coefficient of the pion. Adding the remaining order $\alpha^3$
hadronic contributions we find $$10^{11}\times a^{\rm theory}(\hbox{Hadronic})=
6 993\pm69\quad(e^+e^- + \tau + {\rm spacel.})$$ The figures given are obtained
including $\tau$ decay data. This is to be compared with the recent
experimental value, $$10^{11}\times a^{\rm exp.}(\hbox{Hadronic})=7
174\pm150.$$
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