Accessing the Transverse Dynamics and Polarization of Gluons inside the Proton at the LHC

We argue that the study of heavy quarkonia, in particular that of [Upsilon], produced back to back with an isolated photon in pp collisions at the LHC is the best-and currently unique-way to access the distribution of both the transverse momentum and the polarization of the gluon in an unpolarized p...

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Bibliographic Details
Published in:Physical review letters 2014-05, Vol.112 (21), Article 212001
Main Authors: den Dunnen, Wilco J., Lansberg, Jean-Philippe, Pisano, Cristian, Schlegel, Marc
Format: Article
Language:English
Subjects:
Dynamic tests
Dynamics
Exact solutions
Gluons
Large Hadron Collider
Mathematical analysis
Nuclear Theory
Photons
Physics
Polarization
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Summary:We argue that the study of heavy quarkonia, in particular that of [Upsilon], produced back to back with an isolated photon in pp collisions at the LHC is the best-and currently unique-way to access the distribution of both the transverse momentum and the polarization of the gluon in an unpolarized proton. These encode fundamental information on the dynamics of QCD. We derive analytical expressions for various transverse-momentum distributions that can be measured at the LHC and which allow for a direct extraction of the aforementioned quantities. To assess the feasibility of such measurements, we evaluate the expected yields and the relevant transverse-momentum distributions for different models of the gluon dynamics inside a proton.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.112.212001