14 papers
Exclusive Double-Charmonium Production from e^+ e^- Annihilation into a Virtual Photon
Eric Braaten, Jungil Lee
We calculate the exclusive cross sections for e^+ e^- annihilation into two charmonium states through a virtual photon. Purely electromagnetic contributions are surprisingly large,…
Helicity Decomposition for Inclusive Production
Eric Braaten, Yu-Qi Chen
We present a general method for calculating inclusive cross sections for the production of heavy quarkonium states with definite polarization within the NRQCD factorization approac…
Free Energy of QCD at High Temperature
Eric Braaten, Agustin Nieto
Effective-field-theory methods are used to separate the free energy for a nonabelian gauge theory at high temperature into the contributions from the momentum scales , ,…
On the Convergence of Perturbative QCD at High Temperature
Eric Braaten, Agustin Nieto
The free energy for QCD at high temperature is calculated to order using effective-field-theory methods to separate the contributions from the momentum scales and $gT…
Gluon Fragmentation into Spin-Triplet S-Wave Quarkonium
Eric Braaten, Tzu Chiang Yuan
The leading color-singlet contribution to the fragmentation function for a gluon to split into spin-triplet S-wave quarkonium is presented. In the case of charmonium, we find that…
Effective Field Theory Approach to High-Temperature Thermodynamics
Eric Braaten, Agustin Nieto
An effective field theory approach is developed for calculating the thermodynamic properties of a field theory at high temperature and weak coupling . The effective theory i…