Speaker
Description
We study the transverse single spin asymmetries (TSSAs) in back-to-back photon + jet production in scattering of unpolarized beams of protons off a transversely polarized proton target, with the aim of using these as a probe of the Gluon Sivers Function (GSF). We provide estimates within the region where the imbalance
$\vec{q}_{\perp} \equiv \vec{p}_{\gamma \perp} + \vec{p}_{J \perp}$
between the transverse momenta of the photon and the jet is much smaller than the average of the transverse momenta
$\vec{p}_{\perp} \equiv \frac{\lvert \vec{p}_{\gamma \perp} - \vec{p}_{J \perp} \rvert}{2}$,
i.e., the back-to-back region. The presence of these two scales in the process makes it particularly suitable for applying transverse momentum dependent (TMD) factorization, in contrast to conventional single-scale processes that rely on the generalized parton model approach where the factorization in terms of transverse momentum dependent parton distribution functions is assumed without formal proofs. We present our preliminary results for the transverse single spin asymmetry for this process in the context of the RHIC and NICA experiments.
| Field of contribution | Phenomenology |
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