Application of vertex and mass constraints in track-based alignment Amoraal, J.; Blouw, J.; Blusk, S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2013, Letnik:
712
Journal Article
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The software alignment of planar tracking detectors using samples of charged particle trajectories may lead to global detector distortions that affect vertex and momentum resolution. We present an ...alignment procedure that constrains such distortions by making use of samples of decay vertices reconstructed from two or more trajectories and putting constraints on their invariant mass. We illustrate the method by using a sample of invariant-mass constrained vertices from D0→K−π+ decays to remove a curvature bias in the LHCb spectrometer.
In this paper, we have studied the effect of different parameters on carrier mobility in NWFET devices. Their characteristics have been investigated using the non-equilibrium Green function (NEGF) ...method. Our work involves the carrier mobility µ as a function of VDS taken from 0.1 V to 1 V for various gate lengths, namely: 10, 20, 30, 40, and 50 nm. Then, the variation of µ as a function of width of the nanowire varied from 2 up to 6 nm. After that, we have simulated µ as a function of the oxide thickness for the values: 2, 4 and 6 nm. Moreover, the mobility has been considered as dependent on the composition of high-k materials, namely: SiO2, HfO2, ZrO2. Our results clearly show that device characteristics can be improved by selecting geometrical and physical parameters.
A measurement of the ratio of the branching fractions of the B(+) → K(+)μ(+)μ(-) and B(+) → K(+)e(+)e(-) decays is presented using proton-proton collision data, corresponding to an integrated ...luminosity of 3.0 fb(-1), recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1 < q(2) < 6 GeV(2)/c(4) is measured to be 0.745(-0.074)(+0.090)(stat) ± 0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.
Liability law is rapidly changing in quite a number of countries. This is due to various factors, which are interrelated to a large extent: changing case law and legislation as well as increased and ...still increasing technical and medical knowledge. As a result, various occupational diseases can, for example, be attributed to working conditions or personal injury to specific products. From the very moment that causation can be proven, the question arises of whether or not liability can be established‑ with far-reaching economic consequences for all parties involved. The rise of phenomena such as mass torts, multiple causation, joint and several liability or various heads of damages (like ecological damage and several diseases and affections) rapidly increases the interest in tort law. In the context of the interrelation between liability and insurance, attention must be paid to the question of whether certain liabilities are still coverable or not, and, if they are, to what amounts. (The question of jurisdictions is of growing importance as is the question of whether a specific liability can be covered by insurance. In this context, one should bear in mind that the affordability of tort law also requires safe and sound insurers. The recent past has shown that there is a limit to their financial stability.).
A
bstract
A search for previously unobserved decays of beauty baryons to the final states
and
is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1
.
0 fb
...−1
of
pp
collisions. The
decay is observed with a significance of 8
.
6
σ
, with branching fraction
where the uncertainties are statistical, systematic, from the ratio of fragmentation fractions
and from the branching fraction of the
B
0
→
K
0
π
+
π
−
normalisation channel, respectively. A first measurement is made of the
CP
asymmetry, giving
No significant signals are seen for
decays,
decays to both the
and
final states, and the
decay, and upper limits on their branching fractions are reported.
The production of B ± mesons in proton-proton collisions at s√ = 7 TeV is studied using 35 pb−1 of data collected by the LHCb detector. The B ± mesons are reconstructed exclusively in the B ± → J/ψK ...± mode, with J/ψ → μ + μ −. The differential production cross-section is measured as a function of the B ± transverse momentum in the fiducial region 0 < p T < 40 GeV/c and with rapidity 2.0 < y < 4.5. The total cross-section, summing up B + and B −, is measured to be σ(pp → B ± X, 0 < p T < 40 GeV/c, 2.0 < y < 4.5) = 41.4 ± 1.5 (stat.) ± 3.1 (syst.) μb.
A measurement of the CP asymmetry in B(+)→K(+)μ(+)μ(-) decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb(-1), recorded by the LHCb experiment during ...2011 at a center-of-mass energy of 7 TeV. The measurement is performed in seven bins of μ(+)μ(-) invariant mass squared in the range 0.05<q2<22.00 GeV2/c4, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B(+)→J/ψK(+) decay as a control mode. Averaged over all the bins, the CP asymmetry is found to be A(CP)=0.000±0.033 (stat)±0.005 (syst)±0.007 (J/ψK), where the third uncertainty is due to the CP asymmetry of the control mode. This is consistent with the standard model prediction.
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