Related Experiment Video
Updated: Jun 29, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
J/psi production in sqrt s_NN=200 GeV Cu+Cu collisions
A Adare1, S Afanasiev, C Aidala
1University of Colorado, Boulder, Colorado 80309, USA.
Abstract:
Yields for J/psi production in Cu+Cu collisions at sqrt s_NN=200 GeV have been measured over the rapidity range |y|<2.2 and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data offer greatly improved precision over existing Au+Au data for J/psi production in collisions with small to intermediate numbers of participants, in the range where the quark-gluon plasma transition threshold is predicted to lie. Cold nuclear matter estimates based on ad hoc fits to d+Au data describe the Cu+Cu data up to N_part approximately 50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm(3).
Related Concept Videos
Elastic Collisions: Case Study
Elastic Collisions: Introduction
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Types of Collisions - II
Atomic Nuclei: Nuclear Spin State Population Distribution

