118639521
Kernel density estimation of a multidimensional efficiency profile
Kernel density estimation is a convenient way to estimate the probability density of a distribution given the sample of data points. However, it has certain drawbacks: proper description of the density using narrow kernels needs large data samples, whereas if the kernel width is large, boundaries and narrow structures tend to be smeared. Here, an approach to correct for such effects, is proposed that uses an approximate density to describe narrow structures and boundaries. The approach is shown to be well suited for the description of the efficiency shape over a multidimensional phase space in a typical particle physics analysis. An example is given for the five-dimensional phase space of the Λ0b → D0pπ− decay.
119514726
Feasibility study of model-independent approach to φ3 measurement using Dalitz plot analysis
In this paper, we present results of a feasibility study of a model-independent way to measure the angle φ3 of the unitarity triangle. The method involves B±→DK± decays where the neutral D decays to the K0Sπ+π- final state, together with the sample of decays of CP-tagged D mesons (produced, e.g. in ψ(3770)→DD̄ process) to the same final state. We consider different approaches to the extraction of φ3 and obtain the expected statistical accuracy of the φ3 measurement as a function of B and DCP statistics.
15413983
Study of a model-independent method for the measurement of the angle phi_3
This report shows the latest results on the study of the method to determine the angle phi_3 of the unitarity triangle using Dalitz plot analysis of $D^0$ decay from B->DK process in a model-independent way. We concentrate on the case with a limited charm data sample, which will be available from the CLEO-c collaboration in the nearest future, with the main goal to find the optimal strategy for phi_3 extraction. We find that the analysis using decays of D_CP only cannot provide a completely model-independent measurement in the case of limited data sample. The procedure involving binned analysis of B->DK and psi(3770)->(K^0_S pi^+ pi^-)_D(K^0_S pi^+ pi^-)_D decays is proposed, that allows to obtain the phi_3 precision comparable to unbinned model-dependent fit.
118488638
The use of quantum-correlated D0 decays for φ3 measurement
We report the results of the Monte Carlo study of the method to determine the CKM angle φ3 using Dalitz plot analysis of D0 produced in B±→DK± decay. Our main goal is to find the optimal strategy for a model-independent φ3 extraction. We find that the analysis using decays of CP-tagged D mesons only cannot provide a completely model-independent measurement in the case of a limited data sample. The procedure involving binned analysis of B±→DK± and ψ(3770)→(K0Sπ+π-)D(K0Sπ+π-)D decays is proposed which, in contrast, allows not only to reach the φ3 precision comparable to an unbinned model-dependent fit, but also provides an unbiased measurement with currently available data.
118186681
On model-independent measurement of the angle phi_3 using Dalitz plot analysis
This report shows the latest results on the study of the method to determine the angle phi_3 of the unitarity triangle using Dalitz plot analysis of D^0 decay from B->DK process in a model-independent way. We concentrate on the case with a limited charm data sample, which will be available from the CLEO-c collaboration in the nearest future, with the main goal to find the optimal strategy for phi_3 extraction.
117854224
Observation of CP violation in B-meson decays
With this review, Physics–Uspekhi continues to discuss one of the most mysterious phenomenon in particle physics, that of CP violation. Recent research in this area has focused especially on the properties of B mesons. Successful B-factory experiments have allowed both the detection and detailed study of CP violation in B-meson decays. Presented here is a state of the art review of the field.
123155745
Upgrade of the KEDR tagging system
An upgrade of a special system to tag scattered electrons from two-photon processes, based on triple-GEM detectors, is described. The system is intended for the experiments at the VEPP-4M storage ring. Tests of the detector prototype with two gas mixtures confirm the feasibility of the chosen upgrade layout.