# XXVII International Workshop on Deep Inelastic Scattering and Related Subjects

Apr 8 – 12, 2019
Turin
Europe/Rome timezone

## Exclusive $\rho(770)$ photoproduction at HERA

Apr 10, 2019, 8:50 AM
20m
Cavallerizza Reale - Aula Multifunzione

### Cavallerizza Reale - Aula Multifunzione

Via Verdi, 9 Turin
Parallel Session Talk WG2: Low-x and Diffraction

### Speaker

Arthur Bolz (Ruprecht Karls Universitaet Heidelberg (DE))

### Description

Exclusive photoproduction of $\rho(770)$ vector mesons is studied using the H1 detector at HERA. A sample of about 700000 decays $\rho\to\pi^{+}\pi^{-}$ was collected in the years 2006-2007, using the H1 fast track trigger. It corresponds to an integrated luminosity of $1.3$ pb$^{−1}$. The sample is used to study cross-sections as a function of the invariant mass $m_{\pi\pi}$ of the decay pions, the photon-proton collision energy $W$ and the momentum transfer at the proton vertex $t$. The phase-space restrictions are $0.5< m_{\pi\pi}< 1.3$ GeV, $20< W< 80$ GeV and $\vert t\vert<1.5$ GeV$^{2}$. Reactions where the proton stays intact are statistically separated from those where the proton dissociates to a low-mass hadronic system. The observed cross-section dependencies are parameterized using fits and are compared to expectations from phenomenological models.

### Primary authors

Arthur Bolz (Ruprecht Karls Universitaet Heidelberg (DE)) Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))