Results 91 to 100 of about 22,575 (172)

Introductory Overview of Quark Matter 2012

, 2012
The two arguably most generic phenomena seen in ultra-relativistic heavy ion collisions are the flow of essentially all soft hadronic observables and the quenching of essentially all hard hadronic observables. Limiting the discussion to these two classes
Wiedemann, Urs Achim
core   +1 more source

Accidental Composite Dark Matter

, 2015
We build models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N ...
Antipin, Oleg, Redi, Michele, Strumia, Alessandro, Vigiani, Elena   +3 more
core   +1 more source

Pre-equilibrium photons from the early stages of heavy-ion collisions

Journal of High Energy Physics
We use QCD kinetic theory to compute photon production in the chemically equilibrating Quark-Gluon Plasma created in the early stages of high-energy heavy-ion collisions.
Oscar Garcia-Montero, Aleksas Mazeliauskas, Philip Plaschke, Sören Schlichting   +3 more
doaj   +1 more source

Inclusive distributions near kinematic thresholds. [PDF]

, 2006
The main challenge in computing inclusive cross sections and decay spectra in QCD is posed by kinematic thresholds. The threshold region is characterized by stringent phase–space constraints that are reflected in large perturbative corrections due to ...
Gardi, Einan
core   +1 more source

An N-independent tensor decomposition for SU(N)

Journal of High Energy Physics
To facilitate a simultaneous treatment of an arbitrary number of colors in representation theory-based descriptions of QCD color structure, we derive an N-independent reduction of SU(N) tensor products.
Stefan Keppeler, Malin Sjodahl, Bernanda Telalovic   +2 more
doaj   +1 more source

Gravitational form factors of the baryon octet in holographic QCD

Journal of High Energy Physics
The gravitational form factors (GFFs) of the baryon octet, including hyperons, are investigated in a bottom-up holographic QCD model that explicitly incorporates the SU(3) flavor symmetry breaking through the strange quark mass.
Zhibo Liu, Hiroaki Nakajima, Hiroaki Abuki, Akira Watanabe   +3 more
doaj   +1 more source

Probing transverse momentum dependent structures with azimuthal dependence of energy correlators

Journal of High Energy Physics
We study the azimuthal angle dependence of the energy-energy correlators $$\langle \mathcal{E}\left({\widehat{n}}_{1}\right)\mathcal{E}\left({\widehat{n}}_{2}\right)\rangle $$ in the back-to-back region for e + e − annihilation and deep inelastic ...
Zhong-Bo Kang, Kyle Lee, Ding Yu Shao, Fanyi Zhao   +3 more
doaj   +1 more source

Simplifying QCD event generation with chirality flow, reference vectors and spin directions

Journal of High Energy Physics
The chirality-flow formalism, combined with good choices of gauge reference vectors, simplifies tree-level calculations to the extent that it is often possible to write down amplitudes corresponding to Feynman diagrams immediately.
Emil Boman, Andrew Lifson, Malin Sjodahl, Adam Warnerbring, Zenny Wettersten   +4 more
doaj   +1 more source

Tetraquarks in the Born-Oppenheimer approximation

Journal of High Energy Physics
The conventional loosely bound molecule interpretation of the X(3872) is not compatible with the recent LHCb experimental measurement of the ratio of branching fractions R $$ \mathcal{R} $$ = Br(X → ψ′γ)/Br(X → ψγ). We systematically determine the entire
D. Germani, B. Grinstein, A. D. Polosa
doaj   +1 more source

NNLO QCD predictions for Z-boson production in association with a charm jet within the LHCb fiducial region. [PDF]

Eur Phys J C Part Fields, 2023
Gauld R, Gehrmann-De Ridder A, Glover EWN, Huss A, Rodriguez Garcia A, Stagnitto G.   +5 more
europepmc   +1 more source