A5025870188- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Gaussian Processes and Bayesian Inference
- Scientific Research and Discoveries
- Superconducting Materials and Applications
- advanced mathematical theories
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Advanced Data Storage Technologies
- Statistical Methods and Inference
- Advanced Statistical Methods and Models
- Statistical Methods and Bayesian Inference
- Scientific Measurement and Uncertainty Evaluation
Royal Holloway University of London
2016-2025
Istanbul University
2023-2024
Institute of Science and Technology
2023-2024
Institute for High Energy Physics
1993-2024
A. Alikhanyan National Laboratory
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2019-2023
Boğaziçi University
2023
University of Siegen
1992-2022
Max Planck Institute for Physics
1991-2022
We describe likelihood-based statistical tests for use in high energy physics the discovery of new phenomena and construction confidence intervals on model parameters. focus properties test procedures that allow one to account systematic uncertainties. Explicit formulae asymptotic distributions statistics are derived using results Wilks Wald. motivate justify a representative data set, called "Asimov set", which provides simple method obtain median experimental sensitivity search or...
The summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,717 new measurements 869 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae, reviews topics...
Many models of physics beyond the Standard Model predict existence new Abelian forces with gauge bosons mediating interactions between "dark sectors" and Model. We report a search for dark boson Z' coupling only to second third generations leptons in reaction e+e- -> mu+mu- Z', using 514 fb-1 data collected by BABAR experiment. No significant signal is observed masses range 0.212 - 10 GeV. Limits on parameter g' as low 7x10^-4 are derived, leading improvements bounds compared those...
The statistical models used to derive the results of experimental analyses are incredible scientific value and essential information for analysis preservation reuse. In this paper, we make case systematically publishing full discuss technical developments that practical. By means a variety physics cases -- including parton distribution functions, Higgs boson measurements, effective field theory interpretations, direct searches new physics, heavy flavor dark matter detection, world averages,...
The Higgs Machine Learning Challenge was an open data analysis competition that took place between May and September 2014. Samples of simulated from the ATLAS Experiment at LHC corresponding to signal events with bosons decaying τ+τ– together background were made available public through website science organization Kaggle (kaggle.com). Participants attempted identify search region in a space 30 kinematic variables would maximize expected discovery significance process. One primary goals...
In this paper we describe RooFitUnfold, an extension of the RooFit statistical software package to treat unfolding problems, and which includes most methods that commonly used in particle physics. The provides a common interface these algorithms as well uniform evaluate their performance terms bias, variance coverage. exploit RooFitUnfold compare with Richardson–Lucy, Iterative Dynamically Stabilized, Tikhonov, Gaussian Process, bin-by-bin inversion on several example problems.
The Gamma Variance Model is a statistical model that incorporates uncertainties in the assignment of systematic errors (informally called errors-on-errors). particular use analyses combine results several measurements. In past, combinations have been carried out using two alternative approaches: Best Linear Unbiased Estimator (BLUE) method or what we will call nuisance-parameter method. this paper, obtain general relation between BLUE and methods when correlations induced by are non-trivial...
We study the process $e^+e^- \to \pi^+\pi^-\eta \gamma$, where photon is radiated from initial state. About 8000 fully reconstructed events of this are selected BaBar data sample with an integrated luminosity 469~fb$^{-1}$. Using $\pi^+\pi^-\eta$ invariant mass spectrum we measure \pi^+\pi^-\eta$ cross section in $e^+e^-$ center-of-mass energy range 1.15 to 3.5 GeV. The well described by Vector-Meson Dominance model four $\rho$-like states. observe $49\pm9$ $J/\psi$ decay $\pi^+\pi^-\eta$,...
We study the processes $\gamma \gamma \to \eta_c \eta' K^+ K^-$, $\eta' \pi^+ \pi^-$, and $\eta \pi^-$ using a data sample of 519 $fb^{-1}$ recorded with BaBar detector operating at SLAC PEP-II asymmetric-energy $e^+e^-$ collider center-of-mass energies near $\Upsilon(nS)$ ($n = 2,3,4$) resonances. This is first observation decay $\eta_c K^-$ we measure branching fraction $\Gamma(\eta_c K^-)/(\Gamma(\eta_c \pi^-)=0.644\pm 0.039_{\rm stat}\pm 0.032_{\rm sys}$. Significant interference...
We propose a method for setting limits that avoids excluding parameter values which the sensitivity falls below specified threshold. These "power-constrained" (PCL) address issue motivated widely used CLs procedure, but do so in way makes more transparent properties of statistical test to each value is subjected. A case particular interest upper on parameters are proportional cross section process whose existence not yet established. The basic idea power constraint can easily be applied,...
A dedicated measurement of additional radiation in e+e−→μ+μ−γ and e+e−→π+π−γ initial-state-radiation events is presented using the full BABAR data sample. For first time results are at next-to- next-to-next-to-leading order, with one two photons, respectively, for from initial final states. Comparison predictions phokhara afkqed Monte Carlo generators performed, revealing discrepancies one-photon rates angular distributions former. This disagreement has a negligible effect on e+e−→π+π−(γ)...
The process $e^+e^- \to \pi^+\pi^-2\pi^0\gamma$ is investigated by means of the initial-state radiation technique, where a photon emitted from incoming electron or positron. Using $454.3 \rm{fb}^{-1}$ data collected around center-of-mass energy $\sqrt{s} = 10.58 \rm{GeV}$ BaBar experiment at SLAC, approximately 150000 signal events are obtained. corresponding non-radiative cross section measured with relative uncertainty $3.6\%$ in region $1.5 \rm{GeV}$, surpassing all existing measurements...
We report measurements of $\sin{2\beta}$ and $\cos{2\beta}$ from a time-dependent Dalitz plot analysis $B^{0} \to D^{(*)} h^{0}$ with $D K_{S}^{0} \pi^{+} \pi^{-}$ decays, where the light unflavored neutral hadron $h^{0}$ is $\pi^{0}$, $\eta$, or $\omega$ meson. The performed combination final data sets \babar\ Belle experiments containing $471 \times 10^{6}$ $772 $B\bar{B}$ pairs collected at $\Upsilon\left(4S\right)$ resonance asymmetric-energy B factories PEP-II SLAC KEKB KEK,...
We study the processes $e^+ e^-\to K^0_S K^0_L\pi^0\gamma$, $K^0_S K^0_L\eta\gamma$, and K^0_L\pi^0\pi^0\gamma$, where photon is radiated from initial state, providing cross section measurements for hadronic final states over a continuum of center-of-mass energies. The results are based on 469~$fb^{-1}$ data collected at or near $\Upsilon(4S)$~ resonance with BaBar detector SLAC. present first K^0_L\pi^0$, K^0_L\eta$, K^0_L\pi^0\pi^0$ sections up to energy 4~GeV, their intermediate...
We study the processes e+e−→π+π−π0π0π0γ and π+π−π0π0ηγ in which an energetic photon is radiated from initial state. The data are collected with BABAR detector at SLAC. About 14 000 4700 events, respectively, selected a sample corresponding to integrated luminosity of 469 fb−1. invariant mass hadronic final state defines effective e+e− center-of-mass energy. From spectra, first precise measurement e+e−→π+π−π0π0π0 cross section ever e+e−→π+π−π0π0η performed. energies range threshold 4.35 GeV....
In a statistical analysis in Particle Physics, nuisance parameters can be introduced to take into account various types of systematic uncertainties. The best estimate such parameter is often modeled as Gaussian distributed variable with given standard deviation (the corresponding "systematic error"). Although the assigned errors are usually treated constants, general they themselves uncertain. A type model presented where uncertainty taken account. Estimates variances gamma random variables....
We study the processes $\gamma \gamma \to K^0_S K^{\pm}\pi^{\mp}$ and K^+ K^- \pi^0$ using a data sample of 519~$fb^{-1}$ recorded with BaBar detector operating at SLAC PEP-II asymmetric-energy $e^+ e^-$ collider center-of-mass energies near $\Upsilon(nS)$ ($n = 2,3,4$) resonances. observe $\eta_c$ decays to both final states perform Dalitz plot analyses model-independent partial wave analysis technique. This allows measurement mass-dependence $I=1/2$ $K \pi$ $\mathcal{S}$-wave amplitude...