J. van den Brand
A5021849393- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Advanced Thermodynamics and Statistical Mechanics
- Nuclear physics research studies
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Geophysics and Sensor Technology
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- stochastic dynamics and bifurcation
- Seismic Waves and Analysis
- Nuclear Physics and Applications
- Neutrino Physics Research
- Advanced Frequency and Time Standards
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- Astrophysics and Cosmic Phenomena
- Theoretical and Computational Physics
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
Vrije Universiteit Amsterdam
2015-2024
National Institute for Subatomic Physics
2015-2024
Maastricht University
2019-2024
Utrecht University
1987-2024
Université Paris Cité
2023
Laboratoire AstroParticule et Cosmologie
2023
Centre National de la Recherche Scientifique
2023
Vitenparken
2012-2023
University of Groningen
2017-2021
University of Wisconsin–Madison
1992-2019
A measurement of the ratio branching fractions $B^{+}\rightarrow K^{+}\mu^{+}\mu^{-}$ and K^{+}e^{+}e^{-}$ decays is presented using proton-proton collision data, corresponding to an integrated luminosity 3.0 fb$^{-1}$, recorded with LHCb experiment at center-of-mass energies 7 8 $\mathrm{\,Te\kern -0.1em V}$. The value for dilepton invariant mass squared range $1<q^{2}<6\mathrm{\,Ge\kern V^2\!/}c^4$ measured be $0.745^{+0.090}_{-0.074}\mathrm{\,(stat)}\,\pm0.036\mathrm{\,(syst)}$. This most...
We present a measurement of form-factor-independent angular observables in the decay ${B}^{0}\ensuremath{\rightarrow}{K}^{*}(892{)}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. The analysis is based on data sample corresponding to an integrated luminosity $1.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected by LHCb experiment $pp$ collisions at center-of-mass energy 7 TeV. Four are measured six bins dimuon invariant mass squared ${q}^{2}$ range...
We show by general arguments from linear irreversible thermodynamics that for a heat engine, operating between reservoirs at temperatures ${T}_{0}$ and ${T}_{1}$, ${T}_{0}\ensuremath{\ge}{T}_{1}$, the efficiency maximum power is bounded above $1\ensuremath{-}\sqrt{{T}_{1}/{T}_{0}}$.
We show, through a refinement of the work theorem, that average dissipation, upon perturbing Hamiltonian system arbitrarily far out equilibrium in transition between two canonical states, is exactly given by <W{diss}> =W-DeltaF=kTD(rho||rho[over ])=kT<ln(rho/rho[over ])>, where rho and rho[over ] are phase-space density measured at same intermediate but otherwise arbitrary point time, for forward backward process. D(rho||rho[over ]) relative entropy versus ]. This result also implies general...
We report on a simple model of spatially distributed system which, subject to multiplicative noise, white in space and time, can undergo nonequilibrium phase transition symmetry-breaking state, while no such exists the absence noise term. The possesses features similar those observed at second order equilibrium transitions: divergence correlation length susceptibility, critical slowing down, scaling properties. Furthermore, is found be reentrant: ordered state appears value intensity but...
The effective diffusion coefficient for the overdamped Brownian motion in a tilted periodic potential is calculated closed analytical form. Universality classes and scaling properties weak thermal noise are identified near threshold tilt where deterministic running solutions set in. In this regime may be greatly enhanced, as compared to free with, realistic experimental setup, an enhancement of up 14 orders magnitude.
Resonant structures in B^{0}→ψ^{'}π^{-}K^{+} decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^{-1} collected with LHCb detector. The cannot be described K^{+}π^{-} resonances alone, which is confirmed model-independent approach. A highly significant Z(4430)^{-}→ψ^{'}π^{-} component required, thus confirming existence this state. observed evolution Z(4430)^{-} amplitude ψ^{'}π^{-} mass establishes resonant nature...
A search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ is performed with data collected in 2011 2012 LHCb experiment at Large Hadron Collider. The samples comprise $1.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of proton-proton collisions $\sqrt{s}=8\text{ }\mathrm{TeV}$ $1.0\text{ $\sqrt{s}=7\text{ }\mathrm{TeV}$. We...
The quantum numbers of the X(3872) meson are determined to be JPC = 1++ based on angular correlations in B+ K+ decays, where pi+pi- J/psi and \mu+\mu-. data correspond 1.0 fb-1 pp collisions collected by LHCb detector. only alternative assignment allowed previous measurements, JPC=2-+, is rejected with a confidence level equivalent more than eight Gaussian standard deviations using likelihood-ratio test full phase space. This result favors exotic explanations state.
The Vertex Locator (VELO) is a silicon microstrip detector that surrounds the proton-proton interaction region in LHCb experiment. performance of during first years its physics operation reviewed. system operated vacuum, uses bi-phase CO2 cooling system, and sensors are moved to 7 mm from LHC beam for data taking. stability these characteristic features described, details material budget given. calibration timing processing algorithms implemented FPGAs described. fully characterised. have...
The amount of work that is needed to change the state a system in contact with heat bath between specified initial and final nonequilibrium states at least equal corresponding equilibrium free energy difference plus (respectively, minus) temperature times information initial) relative distributions.
The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector LHC. differential cross-section for prompt measured as a function transverse momentum pT and rapidity y fiducial region 0<pT<14 GeV/c 2.0<y<4.5. fraction from b-hadron decays are also same ranges. analysis based on data sample corresponding to an integrated luminosity 5.2pb-1. cross-sections over 10.52 +/- 0.04 1.40 +1.64/-2.20 mub 1.14 0.01 0.16 decays, where first uncertainty...
We identify the operational conditions for maximum power of a nanothermoelectric engine consisting single quantum level embedded between two leads at different temperatures and chemical potentials. The corresponding thermodynamic efficiency agrees with Curzon-Ahlborn expression up to quadratic terms in gradients, supporting thesis universality beyond linear response.
A search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ is performed at LHCb experiment. The data analyzed correspond to an integrated luminosity of $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $pp$ collisions a center-of-mass energy 7 TeV $2\text{ 8 TeV. An excess signal candidates with respect background expectation seen...
Charm production at the LHC in pp collisions s=7TeV is studied with LHCb detector. The decays D0→K−π+, D+→K−π+π+, D⁎+→D0(K−π+)π+, Ds+→ϕ(K−K+)π+, Λc+→pK−π+, and their charge conjugates are analysed a data set corresponding to an integrated luminosity of 15 nb−1. Differential cross-sections dσ/dpT measured for prompt five charmed hadron species bins transverse momentum rapidity region 0<pT<8GeV/c 2.0<y<4.5. Theoretical predictions compared differential cross-sections. charm hadrons computed...
Coalescences of binary neutron stars and/or black holes are amongst the most likely gravitational-wave signals to be observed in ground-based interferometric detectors. Apart from astrophysical importance their detection, they will also provide us with our very first empirical access genuine strong-field dynamics general relativity (GR). We present a new framework based on Bayesian model selection aimed at detecting deviations GR, subject constraints Advanced Virgo and LIGO The method tests...
The isospin asymmetries of $B \to K\mu^+\mu^-$ and K^{*}\mu^+\mu^-$ decays the partial branching fractions $B^0 K^0\mu^+\mu^-$, $B^+ K^+\mu^+\mu^-$ K^{*+}\mu^+\mu^-$ are measured as functions dimuon mass squared, $q^2$. data used correspond to an integrated luminosity 3$~$fb$^{-1}$ from proton-proton collisions collected with LHCb detector at centre-of-mass energies 7$\,$TeV 8$\,$TeV in 2011 2012, respectively. both consistent Standard Model expectations. three fractions, while individually...
A search for time-integrated CP violation in D(0)→h(-)h(+) (h=K, π) decays is presented using 0.62 fb(-1) of data collected by LHCb 2011. The flavor the charm meson determined charge slow pion D(*+)→D(0)π(+) and D(*-)→D[over ¯](0)π(-) decay chains. difference asymmetry between D(0)→K(-)K(+) D(0)→π(-)π(+), ΔA(CP)≡A(CP)(K(-)K(+))-A(CP)(π(-)π(+)), measured to be [-0.82±0.21(stat)±0.11(syst)]%. This differs from hypothesis conservation 3.5 standard deviations.
Recently exploratory studies were performed on the possibility of constraining neutron star equation state (EOS) using signals from coalescing binary stars, or star--black hole systems, as they will be seen in upcoming advanced gravitational wave detectors such Advanced LIGO and Virgo. In particular, it was estimated to what extent combined information multiple detections would enable one distinguish between different equations through hypothesis ranking parameter estimation. Under...
An exact analytical expression for the effective diffusion coefficient of an overdamped Brownian particle in a tilted periodic potential is derived arbitrary potentials and strengths thermal noise. Near critical tilt (threshold deterministic running solutions) scaling behavior weak noise revealed various universality classes are identified. In comparison with bare (potential-free) diffusion, critically may be, principle, arbitrarily enhanced. For realistic experimental setup, enhancement by...
We review a mean-field analysis and give the details of correlation function approach for spatially distributed systems subject to multiplicative noise, white in space time. confirm existence pure noise-induced reentrant nonequilibrium phase transition model introduced [C. Van den Broeck et al., Phys. Rev. Lett. 73, 3395 (1994)], an intuitive explanation its origin, present extensive simulations dimension d=2. The observed critical properties are compatible with those Ising universality class.