A5057412054- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Theoretical and Computational Physics
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Physics of Superconductivity and Magnetism
- Sociology and Education Studies
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Quantum, superfluid, helium dynamics
- Molecular Junctions and Nanostructures
- Stochastic processes and statistical mechanics
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Scientific Computing and Data Management
- Superconductivity in MgB2 and Alloys
- Advanced NMR Techniques and Applications
- Education Methods and Technologies
- Black Holes and Theoretical Physics
- Cardiac Valve Diseases and Treatments
- French Urban and Social Studies
- German legal, social, and political studies
- Particle Accelerators and Free-Electron Lasers
University of Wisconsin–Madison
2023-2025
Bielefeld University
2014-2024
Christ Hospital
2024
University of Parma
2022-2024
GSI Helmholtz Centre for Heavy Ion Research
2011-2024
LMU Klinikum
2024
Ludwig-Maximilians-Universität München
2024
RIKEN Center for Computational Science
2024
University of Utah
2024
North Carolina State University
2024
We present results on the chiral and deconfinement properties of QCD transition at finite temperature. Calculations are performed with 2+1 flavors quarks using p4, asqtad HISQ/tree actions. Lattices temporal extent N_tau=6, 8 12 used to understand control discretization errors reliably extrapolate estimates obtained lattice spacings continuum limit. The temperature is defined in terms phase a theory two massless analyzed O(N) scaling fits condensate susceptibility. find consistent from...
We present results for the equation of state in (2+1)-flavor QCD using highly improved staggered quark action and lattices with temporal extent $N_{\tau}=6,~8,~10$, $12$. show that these data can be reliably extrapolated to continuum limit obtain a number thermodynamic quantities speed sound temperature range $(130-400)$ MeV. compare our previous calculations, provide an analytic parameterization pressure, from which other calculated, use phenomenology. energy density crossover region, $145~...
We propose a new method to investigate the thermal properties of QCD with small quark chemical potential $\ensuremath{\mu}.$ Derivatives and gluonic observables respect $\ensuremath{\mu}$ are computed at $\ensuremath{\mu}=0$ for two flavors $p4$ improved staggered fermions $ma=0.1,0.2$ on ${16}^{3}\ifmmode\times\else\texttimes\fi{}4$ lattice, used calculate leading order Taylor expansion in location pseudocritical point about $\ensuremath{\mu}=0.$ This should be well behaved values...
We present results on the equation of state in QCD with two light quark flavors and a heavier strange quark. Calculations improved staggered fermions have been performed lattices temporal extent ${N}_{\ensuremath{\tau}}=4$ 6 line constant physics almost physical mass values; pion is about 220 MeV, adjusted to its value. High statistics large are obtained for bulk thermodynamic observables, i.e. pressure, energy entropy density, at vanishing chemical potential wide range temperatures,...
We calculate the equation of state in $2+1$ flavor QCD at finite temperature with physical strange quark mass and almost light masses using lattices temporal extent ${N}_{\ensuremath{\tau}}=8$. Calculations have been performed two different improved staggered fermion actions, asqtad p4 actions. Overall, we find good agreement between results obtained these $O({a}^{2})$ discretization schemes. A comparison earlier calculations on coarser is to quantify systematic errors current studies state....
We present results for pseudo-critical temperatures of QCD chiral crossovers at zero and non-zero values baryon ($B$), strangeness ($S$), electric charge ($Q$), isospin ($I$) chemical potentials $μ_{X=B,Q,S,I}$. The were obtained using lattice calculations carried out with two degenerate up down dynamical quarks a strange quark, quark masses corresponding to physical pion kaon in the continuum limit. By parameterizing as $ T_c(μ_X) = T_c(0) \left[ 1 -κ_2^{X}(μ_{X}/T_c(0))^2...
We calculated the QCD equation of state using Taylor expansions that include contributions from up to sixth order in baryon, strangeness and electric charge chemical potentials. Calculations have been performed with Highly Improved Staggered Quark action temperature range $T\in [135~{\rm MeV}, 330~{\rm MeV}]$ four different sets lattice cut-offs corresponding lattices size $N_\sigma^3\times N_\tau$ aspect ratio $N_\sigma/N_\tau=4$ $N_\tau =6-16$. The strange quark mass is tuned its physical...
We present a detailed calculation of the transition temperature in QCD with two light and one heavier (strange) quark mass on lattices temporal extent ${N}_{\ensuremath{\tau}}=4$ 6. Calculations improved staggered fermions have been performed for various to strange ratios range, $0.05\ensuremath{\le}{\stackrel{^}{m}}_{l}/{\stackrel{^}{m}}_{s}\ensuremath{\le}0.5$, fixed close its physical value. From combined extrapolation chiral (${\stackrel{^}{m}}_{l}\ensuremath{\rightarrow}0$) continuum...
We calculate the quadratic fluctuations of net baryon number, electric charge and strangeness as well correlations among these conserved charges in ($2+1$)-flavor lattice QCD at zero chemical potential. Results are obtained using calculations with tree-level improved gauge highly staggered quark actions almost physical light strange masses three different values cutoff. Our choice parameters corresponds to a value 160 MeV for lightest pseudoscalar Goldstone mass kaon mass. The diagonal...
We present a determination of freeze-out conditions in heavy ion collisions based on ratios cumulants net electric charge fluctuations. These can reliably be calculated lattice QCD for wide range chemical potential values by using next-to-leading order Taylor series expansion around the limit vanishing baryon, and strangeness potentials. From computation up to fourth correlations we first determine potentials that characterize collision confirm temperature $150\text{ }\text{...
We determine the chiral phase transition line in (2+1)-flavor QCD for small values of light quark chemical potential. show that potential curvature can be deduced from an analysis scaling properties condensate and its susceptibilities. To do so we extend earlier studies magnetic equation state to finer lattice spacings, aT=1/8. use these universal order parameter extract at two cut-off, aT=1/4 1/8. find cut-off effects are limit leading obtain Tc(\mu_q)/Tc(0) = 1 - 0.059(2)(4) (\mu_q/T)^2...
We compare lattice QCD results for appropriate combinations of net strangeness fluctuations and their correlations with baryon number predictions from two hadron resonance gas (HRG) models having different strange content. The conventionally used HRG model based on experimentally established hadrons fails to describe the in hadronic phase close crossover. Supplementing conventional additional, uncharted predicted by quark calculations observed spectrum leads good descriptions thermodynamics...
We present a lattice-QCD-based determination of the chiral phase transition temperature in QCD with two degenerate, massless quarks and physical strange quark mass using lattice calculations highly improved staggered action. propose calculate novel estimators for several values light masses, corresponding to Goldstone pion masses range $58\text{ }\text{ }\mathrm{MeV}\ensuremath{\lesssim}{m}_{\ensuremath{\pi}}\ensuremath{\lesssim}163\text{ }\mathrm{MeV}$. The is determined by extrapolating...
We present new results on up to $6^{th}$ order cumulants of net baryon-number fluctuations at small values the baryon chemical potential, $\mu_B$, obtained in lattice QCD calculations with physical light and strange quark masses. Representation Taylor expansions higher terms ratio two lowest cumulants, $M_B/\sigma_B^2=\chi_1^B(T,\mu_B)/\chi_2^B(T,\mu_B)$, allows for a parameter free comparison data proton-number by STAR Collaboration Beam Energy Scan RHIC. show that recent high statistics...
The rise of exascale supercomputers has fueled competition among GPU vendors, driving lattice QCD developers to write code that supports multiple APIs. Moreover, new developments in algorithms and physics research require frequent updates existing software. These challenges have be balanced against constantly changing personnel. At the same time, there is a wide range applications for HISQ fermions studies. This situation encourages development software featuring action flexible,...
We present results of a simulation QCD on 4x16^3 lattice with 2 continuum flavors p4-improved staggered fermion mass m/T=0.4. Derivatives the thermodynamic grand potential respect to quark chemical mu_q up fourth order are calculated, enabling estimates pressure, number density and associated susceptibilities as functions via Taylor series expansion. Discretisation effects various formulations discussed in some detail. In addition it is possible estimate radius convergence expansion function...
We analyze baryon number, strangeness and electric charge fluctuations as well their correlations in QCD at high temperature. present results obtained from lattice calculations performed with an improved staggered fermion action (p4-action) two values of the cut-off almost physical up down quark masses a value for strange mass. compare these results, ideal gas temperature hadron resonance model low find that are described by former already temperatures about 1.5 times transition At...
We calculate the QCD equation of state for temperatures corresponding to transition region with physical mass values two degenerate light quark flavors and a strange using an improved staggered fermion action (p4-action) on lattices temporal extent ${N}_{\ensuremath{\tau}}=8$. compare our results previous calculations performed at twice larger masses as well obtained from resonance gas model calculation. also discuss deconfining chiral aspects in terms renormalized Polyakov loop, strangeness...
The photoproduction of $\ensuremath{\omega}$ mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at ELSA tagged photon facility in Bonn. aim is to study possible in-medium modifications meson via reaction $\ensuremath{\gamma}+A\ensuremath{\rightarrow}\ensuremath{\omega}+X\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}+{X}^{\ensuremath{'}}$. Results obtained for Nb are compared a reference measurement ${\mathrm{LH}}_{2}$ target. While recoiling,...
A first study of critical behavior in the vicinity chiral phase transition (2+1)-flavor QCD is presented. We analyze quark mass and volume dependence condensate susceptibilities with two degenerate light masses a strange quark. The (m_s) chosen close to its physical value; (m_l) are varied wide range 1/80 \le m_l/m_s 2/5, where smallest value corresponds pseudo-scalar Goldstone about 75 MeV. All calculations performed staggered fermions on lattices temporal extent Nt=4. show that numerical...
Appropriate combinations of up to fourth order cumulants net strangeness fluctuations and their correlations with baryon number electric charge fluctuations, obtained from lattice QCD calculations, have been used probe the carrying degrees freedom at high temperatures. For temperatures chiral crossover, separate contributions strange mesons baryons can be well described by an uncorrelated gas hadrons. Such a description breaks down in crossover region, suggesting that deconfinement takes...
Ratios of cumulants conserved net charge fluctuations are sensitive to the degrees freedom that carriers corresponding quantum numbers in different phases strong interaction matter. Using lattice QCD with 2+1 dynamical flavors and quenched charm quarks we calculate second fourth order their correlations other charges such as baryon number, electric strangeness. Analyzing appropriate ratios these probe nature charmed vicinity chiral crossover region. We show for temperatures above transition...
We present lattice QCD results for mesonic screening masses in the temperature range $140\text{ }\text{ }\mathrm{MeV}\ensuremath{\lesssim}T\ensuremath{\lesssim}2500\text{ }\mathrm{MeV}$. Our calculations were carried out using ($2+1$) flavors of highly improved staggered quark action, with a physical value strange mass and two values light corresponding to pion 160 140 MeV. Continuum-extrapolated obtained variety spacings temporal extents ${N}_{\ensuremath{\tau}}=6--16$. discuss implications...