A5086549443- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Scientific Computing and Data Management
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Medical Imaging Techniques and Applications
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Cold Atom Physics and Bose-Einstein Condensates
- Phase Equilibria and Thermodynamics
- Spectral Theory in Mathematical Physics
- Nuclear Physics and Applications
- Complex Systems and Time Series Analysis
- Atomic and Subatomic Physics Research
University of Vienna
2015-2024
University of Wuppertal
2024
Universität Hamburg
2024
National Centre for Nuclear Research
2024
Deutsches Elektronen-Synchrotron DESY
2016-2024
Instituto de Física Corpuscular
2022
Universitat de València
2022
University of Siegen
2019
Johannes Gutenberg University Mainz
2019
University of Liverpool
2019
We give a factorization formula for the e+e- thrust distribution dsigma/dtau with tau=1-T based on soft-collinear effective theory. The result is applicable all tau, i.e. in peak, tail, and far-tail regions. includes O(alphas^3) fixed-order QCD results, resummation of singular partonic alphas^j ln^k(tau)/tau terms N^3LL accuracy, hadronization effects from fitting universal nonperturbative soft function defined field theory, bottom quark mass effects, QED corrections, dominant top dependent...
We construct jet observables for energetic top quarks that can be used to determine a short distance quark mass from reconstruction in e+ e- collisions with accuracy better than Lambda_{QCD}. Using sequence of effective field theories we connect the production energy, mass, and width scales, Q>> m>> Gamma, cross section, derive QCD factorization theorem invariant spectrum. Our analysis accounts for: alpha_s corrections due constraints defining masses, non-perturbative cross-talk...
We consider top quarks produced at large energy in ${e}^{+}{e}^{\ensuremath{-}}$ collisions, and address the question of what mass can be measured from reconstruction. The production process is characterized by well-separated scales: center-of-mass $Q$, $m$, decay width ${\ensuremath{\Gamma}}_{t}$, also ${\ensuremath{\Lambda}}_{\mathrm{QCD}}$; scales which disentangled with effective theory methods. In particular we show how measurement depends on way soft radiation treated, that this shift...
We compute the $e^+ e^-$ C-parameter distribution using Soft-Collinear Effective Theory with a resummation to N${}^3$LL$^\prime$ accuracy of most singular partonic terms. This includes known fixed-order QCD results up ${\cal O} (α_s^3)$, numerical determination two loop non-logarithmic term soft function, and all logarithmic terms in jet functions three loops. Our result holds for $C$ peak, tail, far tail regions. Additionally, we treat hadronization effects field theoretic nonperturbative...
This report summarizes the proceedings of 2014 Mainz Institute for Theoretical Physics (MITP) scientific program on "High precision fundamental constants at TeV scale". The two outstanding parameters in Standard Model dealt with during MITP are strong coupling constant $α_s$ and top-quark mass $m_t$. Lacking knowledge value those is often limiting factor accuracy theoretical predictions. current status $m_t$ has been reviewed directions future research have identified.
Abstract Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi class="MJX-tex-calligraphic" mathvariant="script">O</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1</mml:mn> <mml:mo>%</mml:mo>...
Theoretical predictions for inclusive semileptonic $B$ decay rates are rewritten in terms of the $\ensuremath{\Upsilon}(1S)$ meson mass instead $b$ quark mass, using a modified perturbation expansion. This method gives theoretically consistent and phenomenologically useful results. Perturbation theory is well behaved, largest theoretical error coming from uncertainty eliminated. The results applied to determination $|{V}_{\mathrm{cb}}|$, $|{V}_{\mathrm{ub}}|$, ${\ensuremath{\lambda}}_{1}$.
Theoretical predictions for $B$ decay rates are rewritten in terms of the $\ensuremath{\Upsilon}(1S)$ meson mass instead $b$ quark mass, using a modified perturbation expansion. The theoretical consistency this expansion is shown both at low and high orders. Our method improves behavior series semileptonic nonleptonic inclusive modes, as well exclusive form factors. results applied to determination branching ratio, charm counting, ratio...
This report contains the results of Workshop on CKM Unitarity Triangle, held at CERN 13-16 February 2002 to study determination matrix from available data K, D, and B physics. is a coherent document with chapters covering elements tree level decays K meson mixing global fits unitarity triangle parameters. The impact future measurements also discussed.
Distributions in jet production often depend on a soft function, S, which describes hadronic radiation between the jets. Near kinematic thresholds S encodes nonperturbative information, while far from can be computed with an operator product expansion (OPE). We design functions for jets that serve this dual purpose, reducing to perturbative result OPE region and consistent model region. use MSbar scheme, both regions displays appropriate renormalization group scale dependence. point out...
A short-distance heavy-quark mass depends on two parameters: the renormalization scale $\ensuremath{\mu}$ and a $R$ controlling absorption of infrared fluctuations. The radius for perturbative corrections that build up beyond its pointlike definition in pole scheme is $\ensuremath{\sim}1/R$. Treating as variable gives renormalization-group equation. evolution improves stability conversion between schemes, allowing us to avoid large logs renormalon. can also be used study IR renormalons...
We study the Sudakov form factor for a spontaneously broken gauge theory using (new) $\ensuremath{\Delta}$-regulator. To be well defined, effective requires zero-bin subtractions collinear sectors. The depend on boson mass $M$ and are not scaleless. They have both finite $1/ϵ$ contributions needed to give correct anomalous dimension low-scale matching contributions. also demonstrate necessity of soft-collinear factorization. find that after is sum minus soft mass-mode contribution, in...
We present a global fit for $\alpha_s(m_Z)$, analyzing the available C-parameter data measured at center-of-mass energies between $Q=35$ and $207$ GeV. The experimental is compared to N$^3$LL$^\prime$ + $\mathcal{O}(\alpha_s^3)$ $\Omega_1$ theoretical prediction (up missing 4-loop cusp anomalous dimension), which includes power corrections coming from field nonperturbative soft function. dominant hadronic parameter its first moment $\Omega_1$, defined in scheme eliminates...
We consider cumulant moments (cumulants) of the thrust distribution using predictions full spectrum for including O(alpha_s^3) fixed order results, resummation singular N^3LL logarithmic contributions, and a class leading power corrections in renormalon-free scheme. From global fit to first moment we extract strong coupling correction matrix element Omega_1. obtain alpha_s(m_Z) = 0.1141 \pm (0.0004)_exp (0.0014)_hadr (0.0007)_pert, where 1-sigma uncertainties are experimental, from...
The successful operation of the Large Hadron Collider (LHC) and excellent performance ATLAS, CMS, LHCb ALICE detectors in Run-1 Run-2 with $pp$ collisions at center-of-mass energies 7, 8 13 TeV as well giant leap precision calculations modeling fundamental interactions hadron colliders have allowed an extraordinary breadth physics studies including measurements a variety processes. LHC results so far confirmed validity Standard Model particle up to unprecedented energy scales great sectors...
The most precise top quark mass measurements use kinematic reconstruction methods, determining the parameter of a Monte Carlo event generator, $m_t^{\rm MC}$. Due to hadronization and parton shower dynamics, relating MC}$ field theory is difficult. We present calibration procedure determine this relation using hadron level QCD predictions for observables with sensitivity. Fitting $e^+e^-$ 2-Jettiness calculations at NLL/NNLL order Pythia 8.205, differs from pole by $900$/$600$ MeV, agrees...
A bstract The Compact Linear Collider (CLIC) is a proposed future high-luminosity linear electron-positron collider operating at three energy stages, with nominal centre-of-mass energies $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 380 GeV, 1 . 5 TeV, and 3 TeV. Its aim to explore the frontier, providing sensitivity physics beyond Standard Model (BSM) precision measurements of processes an emphasis on Higgs...
This review provides an overview of the conceptual issues regarding interpretation so-called direct top quark mass measurements, which are based on kinematic reconstruction decay products at Large Hadron Collider (LHC). These measurements quote parameter [Formula: see text] Monte Carlo event generators with current uncertainties around 0.5 GeV. The problem finding a rigorous relation between and renormalization schemes defined in field theory is unresolved to date touches perturbative as...
We propose a kinematic method based on factorization formula for precisely measuring the top quark mass $m_t$ in $pp$ collisions using boosted jets with light soft drop grooming. By grooming, which is an order of magnitude less aggressive than typical we retain universal description scheme and decay effects, while still effectively removing contamination from jet. give field theory results hadronization corrections induced by heavy quark, showing they are described hadronic parameter that...
A bstract We show that the presence of an infrared cutoff Q 0 in parton shower (PS) evolution for massive quarks implies generator quark mass corresponds to a -dependent short-distance scheme and is therefore not pole mass. Our analysis considers angular ordered based on coherent branching formalism quasi-collinear stable heavy splitting functions at next-to-leading logarithmic (NLL) order, it peak hemisphere jet distributions. NLL sufficient describe full order (NLO). determine relation...
The pole mass of a heavy quark is ambiguous by an amount order $\Lambda_{QCD}$. We show that the heavy-quark potential, $V(r)$, similarly ambiguous, but total static energy, $2M_{pole}+V(r)$, unambiguous when expressed in terms short-distance mass. This implies extraction from quarkonium spectrum free ambiguity $\Lambda_{QCD}$, contrast with