Production and polarization of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi></mml:math>-wave quarkonia in potential nonrelativistic QCD
Nora Brambilla, Hee Sok Chung, Antonio Vairo, Xiang-Peng Wang
Abstract
Based on the potential nonrelativistic QCD formalism, we compute the nonrelativistic QCD long-distance matrix elements (LDMEs) for inclusive production of $S$-wave heavy quarkonia. This greatly reduces the number of nonperturbative unknowns and brings in a substantial enhancement in the predictive power of the nonrelativistic QCD factorization formalism. We obtain improved determinations of the LDMEs and find cross sections and polarizations of $J/\ensuremath{\psi}$, $\ensuremath{\psi}(2S)$, and excited $\mathrm{\ensuremath{\Upsilon}}$ states that agree well with LHC data. Our results may have important implications in pinning down the heavy quarkonium production mechanism.
Topics & Concepts
Quantum chromodynamicsPhysicsPolarization (electrochemistry)Particle physicsChemistryPhysical chemistryQuantum Chromodynamics and Particle InteractionsParticle physics theoretical and experimental studiesHigh-Energy Particle Collisions Research