Towards the experimental clarification of quarkonium polarization
By P. Faccioli, C. Lourenço, J. Seixas, H. Wöhri. 2010
187 citations recorded by the source corpus.
We highlight issues which are often underestimated in the experimental analyses on quarkonium polarization: the relation between the parameters of the angular distributions and the angular momentum composition of the quarkonium, the importance of the choice of the reference frame, the interplay between observed decay and production kinematics, and the consequent influence of the experimental acceptance on the comparison between experimental measurements and theoretical calculations. Given the puzzles raised by the available experimental results, new measurements must provide more detailed information, such that physical conclusions can be derived without relying on model-dependent assumptions. We describe a frame-invariant formalism which minimizes the dependence of the measurements on the experimental acceptance, facilitates the comparison with theoretical calculations, and probes systematic effects due to experimental biases. This formalism is a direct and generic consequence of the rotational invariance of the dilepton decay distribution and is independent of any assumptions specific to particular models of quarkonium production. The use of this improved approach, which exploits the intrinsic multidimensionality of the problem, will significantly contribute to a faster progress in our understanding of quarkonium production, especially if adopted as a common analysis framework by the LHC experiments, which will soon perform analyses of quarkonium polarization in proton-proton collisions.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/ca84eb9140ff65943567ea5f80101984f8becc22
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In Nuclear and High Energy Physics
Citations in the corpus
- New observables in inclusive production of quarkonia (2019, methodology): “We guide the reader to [35] for the definitions of the corresponding axes, their naturalness in the context of some production mechanisms as well as a detailed discussion about the frame dependence and about how measurements in different frames can be compared and to [41] for an exhaustive list of t”
- Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions (2015, background): “An obvious one is the yield, another one is λ̃ = (λθ+3λφ)/(1−λφ) [224].”