arXiv subjects

Anton Poluektov

Publications and source records attributed to Anton Poluektov.

13 recordsLinked to original sources

arXiv2023

Towards the precision measurement of CP violation in $B\to D^{\ast}μν$ decays at LHCb

Measurement of $CP$-violating observables in semileptonic decays is a sensitive null-test of the Standard Model: any $CP$ violation would be an unambiguous sign of New Physics effects. The model-independent technique to measure parity and $CP$-odd observables in the $B\to D^{\ast}μν$ decays is proposed, which effectively cancels out parity-even terms in the decay density together with the associated theory uncertainty. The feasibility study is performed with pseudoexperiments, and the sensitivity at the LHCb experiment is estimated. Finally, the most significant systematic effects and the data-driven ways to control them are considered.

hep-ph↗

arXiv2021

Efficient description of experimental effects in amplitude analyses

Amplitude analysis is a powerful technique to study hadron decays. A significant complication in these analyses is the treatment of instrumental effects, such as background and selection efficiency variations, in the multidimensional kinematic phase space. This paper reviews conventional methods to estimate efficiency and background distributions and outlines the methods of density estimation using Gaussian processes and artificial neural networks. Such techniques see widespread use elsewhere, but have not gained popularity in use for amplitude analyses. Finally, novel applications of these models are proposed, to estimate background density in the signal region from the sidebands in multiple dimensions, and a more general method for model-assisted density estimation using artificial neural networks.

physics.data-an↗

arXiv2020

Oscillations of $B_s^0$ mesons as a probe of decays with unreconstructed particles

A new experimental technique to study the decays of $B^0_s$ mesons into final states involving unreconstructable particles is proposed. The method uses a characteristic feature of fast flavour oscillations of $B^0_s$ mesons. Analysis of the oscillation-frequency spectrum of partially reconstructed flavour-tagged $B^0_s$ decays provides information about the mass spectrum of unreconstructed decay products and suppresses any background that does not come from the decays of $B^0_s$ mesons.

hep-ph↗

arXiv2019

Model-independent method for measuring the angular coefficients of $B^0 \to D^{*-} τ^+ ν_τ$ decays

Reconstruction of the $B^0 \to D^{*-} τ^+ ν_τ$ angular distribution is complicated by the strongly-biasing effect of losing the neutrino information from both the $B$ and $τ$ decays. In this work, a novel method for making unbiased measurements of the angular coefficients while preserving the model independence of the angular technique is demonstrated. The twelve angular functions that describe the signal decay, in addition to background terms, are modelled in a multidimensional fit, using template probability density functions that encapsulate all resolution and acceptance effects. Sensitivities at the LHCb and Belle II experiments are estimated, and sources of systematic uncertainty are discussed, notably in the extrapolation to a measurement of $R(D^{*})$.

hep-ph↗

arXiv2018

Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2

Since 2015, with the restart of the LHC for its second run of data taking, the LHCb experiment has been empowered with a dedicated computing model to select and analyse calibration samples to measure the performance of the particle identification (PID) detectors and algorithms. The novel technique was developed within the framework of the innovative trigger model of the LHCb experiment, which relies on online event reconstruction for most of the datasets, reserving offline reconstruction to special physics cases. The strategy to select and process the calibration samples, which includes a dedicated data-processing scheme combining online and offline reconstruction, is discussed. The use of the calibration samples to measure the detector PID performance, and the efficiency of PID requirements across a large range of decay channels, is described. Applications of the calibration samples in data-quality monitoring and validation procedures are also detailed.

hep-ex↗

arXiv2018

Unbinned model-independent measurements with coherent admixtures of multibody neutral $D$ meson decays

Various studies of Standard Model parameters involve measuring the properties of a coherent admixture of $D^0$ and $\overline{D}^0$ states. A typical example is the determination of the Unitarity Triangle angle $γ$ in the decays $B\to DK$, $D\to K_S^0π^+π^-$. A model-independent approach to perform this measurement is proposed that has superior statistical sensitivity than the well-established method involving binning of the $D\to K_S^0π^+π^-$ decay phase space. The technique employs Fourier analysis of the complex phase difference between $D^0$ and $\overline{D}^0$ decay amplitudes and can be easily generalised to other similar measurements, such as studies of charm mixing or determination of the angle $β$ from $B^0\to D h^0$ decays.

hep-ph↗

arXiv2017

Optimising sensitivity to $γ$ with $B^0 \to DK^+π^-$, $D \to K_{\rm S}^0π^+π^-$ double Dalitz plot analysis

Two of the most powerful methods currently used to determine the angle $γ$ of the CKM Unitarity Triangle exploit $B^+ \to DK^+$, $D \to K_{\rm S}^0π^+π^-$ decays and $B^0 \to DK^+π^-$, $D \to K^+K^-$, $π^+π^-$ decays. It is possible to combine the strengths of both approaches in a "double Dalitz plot" analysis of $B^0 \to DK^+π^-$, $D \to K_{\rm S}^0π^+π^-$ decays. The potential sensitivity of such an analysis is investigated in the light of recently published experimental information on the $B^0 \to DK^+π^-$ decay. The formalism is also expanded, compared to previous discussions in the literature, to allow $B^0 \to DK^+π^-$ with any subsequent $D$ decay to be included.

hep-ph↗

arXiv2014

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 $Λ_b^0\to D^0pπ$ decay.

physics.data-an↗

arXiv2013

Effect of direct CP violation in charm on gamma extraction from B->DK, D->K0Spi+pi- Dalitz plot analysis

A possible effect of direct CP violation in D->K0Spipi decay on the gamma measurement from B->DK, D->K0Spi+pi- Dalitz plot analysis is considered. Systematic uncertainty of gamma coming from the current limits on direct CP violation in D->K0Spi+pi- is estimated, and a modified model-independent procedure of B->DK, D->K0Spi+pi- Dalitz plot analysis is proposed that gives an unbiased gamma measurement even in presence of direct CP violation in charm decays. The technique is applicable to other three-body D decays such as D->K0SK+K-, D->pi+pi-pi0, etc.

hep-ph↗

arXiv2011

Ultimate sensitivity on gamma/phi3 from B->DK

Measurement of the CKM phase gamma in B->DK decays can be potentially performed with high precision due to low theoretical uncertainties. However, the precision measurement requires very large experimental samples of B decays. This report covers prospects for gamma measurement at the future e+e- facilities and upgraded LHCb detector.

hep-ex↗

arXiv2010

Charm mixing in the model-independent analysis of correlated D0-D0bar decays

We investigate the impact of charm mixing on the model-independent gamma measurement using Dalitz plot analysis of the three-body D decay from B+->DK+ process, and show that ignoring the mixing at all stages of the analysis is safe up to a sub-degree level of precision. We also find that in the coherent production of D0-D0* system in e+e- collisions, the effect of charm mixing is enhanced, and propose a model-independent method to measure charm mixing parameters in the time-integrated Dalitz analysis at charm factories.

hep-ph↗

arXiv2010

Double Dalitz Plot Analysis of the Decay B^0 -> D K+ Pi-, D -> Ks Pi+ Pi-

It is shown that it is possible to perform a model-independent extraction of the CKM Unitarity Triangle angle $γ$ using only the decays $B^0\to D K^+π^-$ with $D\to K^0_Sπ^+π^-$ and $B^0\to D K^+π^-$ with flavour-specific $D$ decays. The proposed method can also utilise the $B^0\to D K^+π^-$ data with CP-eigenstate decays of the D meson in a model-independent way.

hep-ph↗

arXiv2007

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.

hep-ph↗