Under very general assumptions we show that the quark dispersion relation in the quark-gluon plasma is given by two collective branches, of which one has a minimum at a nonvanishing momentum. This general feature of the quark dispersion relation leads to structures (van Hove singularities, gaps) in the low mass dilepton production rate, which might provide a unique signature for the quark-gluon plasma formation in relativistic heavy ion collisions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.84.841 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The and couplings from light-cone sum rules.
J High Energy Phys
March 2021
School of Physics, Nankai University, Weijin Road 94, Tianjin, 300071 China.
We revisit the calculation of the strong couplings and from the QCD light-cone sum rules using the pion light-cone distribution amplitudes. The accuracy of the correlation function, calculated from the operator product expansion near the light-cone, is upgraded by taking into account the gluon radiative corrections to the twist-3 terms. The double spectral density of the correlation function, including the twist-2, 3 terms at and the twist-4 LO terms, is presented in an analytical form for the first time.
View Article and Find Full Text PDFSeparation of Quark Flavors Using Deeply Virtual Compton Scattering Data.
Phys Rev Lett
December 2020
Institüt für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany.
Using the available data on deeply virtual Compton scattering (DVCS) off protons and utilizing neural networks enhanced by the dispersion relation constraint, we determine six out of eight leading Compton form factors in the valence quark kinematic region. Furthermore, adding recent data on DVCS off neutrons, we separate contributions of up and down quarks to the dominant form factor, thus paving the way towards a three-dimensional picture of the nucleon.
View Article and Find Full Text PDFA Deep Neural Network for Simultaneous Estimation of b Jet Energy and Resolution.
Comput Softw Big Sci
October 2020
University of Wisconsin - Madison, Madison, WI USA.
Article Synopsis
- - A new method is introduced to estimate the energy and spread of b quark jets from proton-proton collisions at CERN's LHC, using data from 2017.
- - The algorithm utilizes a deep feed-forward neural network trained on simulated b jets, incorporating jet composition, shape, and secondary vertex properties.
- - The findings enhance the analysis of b jets, which aids in research such as the detection of Higgs boson decay.
Spinon confinement and a sharp longitudinal mode in YbPtPb in magnetic fields.
Nat Commun
March 2019
Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843, USA.
The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the ground state is Néel ordered. Here, we report high resolution neutron scattering experiments, which reveal how a magnetic field closes this gap and drives the spin chains in YbPtPb to a critical, disordered Luttinger-liquid state.
View Article and Find Full Text PDFFinite-temperature gluon spectral functions from lattice QCD.
Eur Phys J C Part Fields
February 2018
1Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Joliot-Curie Str. 6, 141980 Dubna, Russia.
We investigate gluon correlation functions and spectral functions at finite temperature in Landau gauge on lattice QCD ensembles with dynamical twisted-mass quarks flavors, generated by the tmfT collaboration. They cover a temperature range from using the fixed-scale approach. Our study of spectral properties is based on a novel Bayesian approach for the extraction of non-positive-definite spectral functions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!