A5008289720- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Distributed and Parallel Computing Systems
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Robot Manipulation and Learning
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Social Robot Interaction and HRI
- Black Holes and Theoretical Physics
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Magnetic confinement fusion research
- Robotics and Automated Systems
- Modular Robots and Swarm Intelligence
- Particle Accelerators and Free-Electron Lasers
- Digitalization, Law, and Regulation
- Corporate Governance and Management
- Medical and Health Sciences Research
- Criminal Law and Policy
- Vestibular and auditory disorders
Folkwang University of the Arts
2020-2024
University of Siegen
2020-2024
Technical University of Munich
1999-2024
Durham University
2012-2023
University of Warwick
2022
Max Planck Institute for Plasma Physics
2019-2021
Max Planck Society
2019
Bristol Robotics Laboratory
2008-2017
Syracuse University
2016
University Medical Center
2015
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV measured properties compatible those Standard-Model Higgs boson, coupled absence discoveries phenomena beyond Standard Model at TeV scale, has triggered interest in ideas for future factories. A circular e+e- collider hosted 80 to 100 km tunnel, TLEP, is among most attractive solutions proposed so far. It clean experimental environment, produces high luminosity top-quark, W Z studies, accommodates multiple...
During 2011 the LHCb experiment at CERN collected 1.0 fb−1 of $\sqrt{s} = 7\mbox{~TeV}$ pp collisions. Due to large heavy quark production cross-sections, these data provide unprecedented samples flavoured hadrons. The first results from have made a significant impact on flavour physics landscape and definitively proved concept dedicated in forward region hadron collider. This document discusses implications measurements classes extensions Standard Model, bearing mind interplay with searches...
We analyze three different new physics scenarios for $\ensuremath{\Delta}F=2$ flavor-changing neutral currents in the quark sector light of recent data on neutral-meson mixing. parametrize generic contributions to ${B}_{q}\mathrm{\text{\ensuremath{-}}}{\overline{B}}_{q}$ mixing, $q=d$, $s$, terms one complex quantity ${\ensuremath{\Delta}}_{q}$, while parameters ${\ensuremath{\Delta}}_{K}^{tt}$, ${\ensuremath{\Delta}}_{K}^{ct}$, and ${\ensuremath{\Delta}}_{K}^{cc}$ are needed describe...
The present report documents the results of Working Group 2: B, D and K decays, workshop on Flavor in Era LHC, held at CERN from November 2005 through March 2007. With advent we will be able to probe New Physics (NP) up energy scales almost one order magnitude larger than it has been possible with accelerator facilities. While direct detection new particles main avenue establish presence NP indirect searches provide precious complementary information, since most probably not measure full...
We perform a comprehensive statistical analysis of the standard model (SM) with three and four generations using latest Higgs search results from LHC Tevatron, electroweak precision observables measured at LEP SLD, determinations ${M}_{W}$, ${m}_{t}$, ${\ensuremath{\alpha}}_{s}$. For three-generation case we analyze tensions in fit by removing individual comparing their predicted values ones. In particular, discuss impact on deviations best-fit values. Our indirect prediction top mass is...
We update the Standard-Model predictions for several quantities related to $B_s - \bar B_s$ and $B_d B_d$ mixing. The mass width differences in $B_s$ system read $ ΔM_s^{\rm SM} = (17.3 \pm 2.6) ps^{-1}$ $ΔΓ_s^{\rm SM}= (0.087 0.021) ps^{-1}$, respectively. CP asymmetries flavour-specific decays are $a_{\rm fs}^{s,\rm (1.9 0.3) \cdot 10^{-5}$ fs}^{d,\rm (4.1 0.6) 10^{-4}$. further critically discuss sensitivity of $ΔΓ_d$ new physics uncertainties relation between $ΔΓ_s$ branching fraction...
Sources of $C\phantom{\rule{0}{0ex}}P$ violation beyond those the standard model particle physics are needed to explain dominance matter over antimatter in universe. The bound state a bottom antiquark and strange quark its charge conjugate is fertile hunting ground, as violating effects typically small. This article reviews many studies ${B}_{s}$ decays, quantum mixing anti-${B}_{s}$, their interference.
Kolya Uraltsev was one of the inventors Heavy Quark Expansion (HQE), that describes inclusive weak decays hadrons containing heavy quarks and in particular lifetimes. Besides giving a pedagogic introduction to subject, we review development current status HQE, which just recently passed several non-trivial experimental tests with an unprecedented precision. In view many new results for lifetimes hadrons, also update theory predictions: [Formula: see text], τ(B s )/τ(B d ) = 1.001 ±0.002, τ(Λ...
We investigate the experimentally allowed parameter space of an extension standard model (SM3) by one additional family fermions. Therefore we extend our previous study CKM like mixing constraints a fourth generation quarks. In addition to bounds from tree-level determinations 3$\times$3 elements and FCNC processes ($K$-, $D$-, $B_d$-, $B_s$-mixing decay $b \to s \gamma$) also electroweak $S$, $T$, $U$ parameters, angle $\gamma$ unitarity triangle rare $B_s \mu^+ \mu^-$. Moreover improve...
Many new physics models that explain the intriguing anomalies in $b$-quark flavour sector are severely constrained by $B_s$-mixing, for which Standard Model prediction and experiment agreed well until recently. The most recent FLAG average of lattice results non-perturbative matrix elements points, however, direction a small discrepancy this observable. Using up-to-date inputs from standard sources such as PDG, one two leading CKM fitting groups to determine $\Delta M_s^{\rm SM}$, we find...
The hadronic matrix elements of dimension-six $\Delta F=0,2$ operators are crucial inputs for the theory predictions mixing observables and lifetime ratios in $B$ $D$ system. We determine them using HQET sum rules three-point correlators. results required three-loop computation correlators one-loop QCD-HQET matching given analytic form. For we find very good agreement with recent lattice comparable theoretical uncertainties. present first ever determination meson sector B=0$ uncertainties...
Meson mixing is considered to be an ideal candidate for new physics searches. Current experimental precision has greatly increased over the recent years, excelling in several cases theoretical precision. A possible limit accuracy could a hypothetical breakdown of quark-hadron duality. We propose simple model duality violations and give stringent bounds on such effects observables, indicating regions, where future measurements $\Delta \Gamma_d$, $a_{sl}^d$ $a_{sl}^s$ would clear signals...
A bstract We present a considerably improved analysis of model-independent bounds on new physics effects in non-leptonic tree-level decays B-mesons. Our main finding is that contributions about ± 0 . 1 to the Wilson coefficient colour-singlet operator Q 2 effective weak Hamiltonian and range 5 (both for real imaginary part) can currently not be excluded at 90% C.L. Effects such size modify direct experimental extraction CKM angle γ by up 10 ° they could lead an enhancement decay rate...
A bstract We consider the effects of a non-vanishing strange-quark mass in determination full basis dimension six matrix elements for B s mixing, particular we get ratio V − Bag parameter and d system: $$ {\overline{B}}_{Q_1}^s/{\overline{B}}_{Q_1}^d={0.987}_{-0.009}^{+0.007} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mover> <mml:mi>B</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:msub> <mml:mi>Q</mml:mi> <mml:mn>1</mml:mn> </mml:msub> <mml:mi>s</mml:mi>...
In light of the recent LHCb observation CP violation in charm sector, we review standard model (SM) predictions sector and particular for $\Delta A_{CP}$. We get as an upper bound SM $| \Delta A_{CP} ^{\rm SM}| \leq 3.6 \times 10^{-4}$, which can be compared to measurement LHCb2019} = (-15.4 \pm 2.9) 10^{-4}$. discuss resolving this tension within extension that includes a flavour violating $Z'$ couples only $\bar{s}s$ $\bar{c}u$. show masses below 80 GeV coupling order $10^{-4}$,...
Abstract In this article, we review the current status of B -mixing and b -hadron lifetimes both from experimental theoretical points view. Furthermore, discuss phenomenological potential these observables for deepening our understanding quantum chromodynamics (QCD) indirect searches effects beyond Standard Model (SM). addition, present new updated SM predictions mixing $$\Delta M_{d,s}$$ <mml:math...
We calculate the electromagnetic and axial form factors of nucleon within framework light cone sum rules (LCSR) to leading order in QCD including higher twist corrections. In particular we motivate a certain choice for interpolating field. find that simple model distribution amplitudes which deviate from their asymptotic shape, but much less compared rule estimates, allows one describe data remarkably well.
We perform an exploratory study of the allowed parameter range for CKM-like mixing hypothetical quarks a fourth generation. As experimental constraints we use tree-level determinations 3 $\times$ CKM elements and FCNC processes ($K$-, $D$-, $B_d$-, $B_s$-mixing decay $b \to s \gamma$) under assumption that 4 matrix is unitary. For FCNCs some simplifying assumptions concerning QCD corrections. Typically small with family favoured, but contrary to expectation find also quite large 4th not yet excluded.