Probing chiral-even and chiral-odd leading twist quark generalised parton distributions through the exclusive photoproduction of a gamma rho pair - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... Year : 2023

## Probing chiral-even and chiral-odd leading twist quark generalised parton distributions through the exclusive photoproduction of a gamma rho pair

Goran Duplančić
• Function : Author
Kornelija Passek-Kumerički
• Function : Author
Bernard Pire
• Function : Author
Lech Szymanowski
• Function : Author

#### Abstract

We extend our studies of a new class of $2 \to 3$ exclusive processes using the collinear factorisation framework by considering the exclusive photoproduction of a $\gamma\,\rho$ pair, in the kinematics where the pair has a large invariant mass, {and the outgoing $\rho$-meson has a sufficiently large transverse momentum to not resonate with the nucleon}. We cover the whole kinematical range from medium energies in fixed target experiments to very large energies of colliders, by considering the experimental conditions of JLab~12-GeV, COMPASS, future EIC and LHC (in ultra-peripheral collisions) cases. One of the main interest in studying the present process is that it provides access to both chiral-even and chiral-odd GPDs, depending on the polarisation of the outgoing $\rho$-meson, both at leading twist. Our analysis covers both neutral and charged $\rho$-mesons. We find that the order of magnitude of the obtained cross sections are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab, for both longitudinally and transversely polarised $\rho$. Furthermore, we compute the linear photon beam polarisation asymmetry {which is} sizeable for a longitudinally polarised meson. These predictions are obtained for both asymptotic distribution amplitude (DA) and the \textit{holographic} DA.

#### Domains

Physics [physics]

### Dates and versions

hal-04005093 , version 1 (26-02-2023)

### Identifiers

• HAL Id : hal-04005093 , version 1
• ARXIV :
• INSPIRE :

### Cite

Goran Duplančić, Saad Nabeebaccus, Kornelija Passek-Kumerički, Bernard Pire, Lech Szymanowski, et al.. Probing chiral-even and chiral-odd leading twist quark generalised parton distributions through the exclusive photoproduction of a gamma rho pair. 2023. ⟨hal-04005093⟩

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