Backward-Angle ($u$-channel) Production at an Electron-Ion Collider

Abstract

In backward photoproduction of mesons, $\gamma p\to Mp$, the target proton takes most of the photon momentum, while the produced meson recoils in the direction from which the photon came. Thus the Mandelstam $u$ is small, while the squared momentum transfer $t$ is typically large, near the kinematic limit. In a collider geometry, backward production transfers the struck baryon by many units of rapidity, in a striking similarity to baryon stopping. We explore this similarity, and point out the similarities between the Regge theories used to model baryon stopping with those that are used for backward production. We then explore how backward production can be explored at higher energies than are available at fixed target experiments, by studying production at an electron-ion collider. We calculate the expected $ep$ cross sections and rates, finding that the rate for backward $\omega$ production is about 1/300 that of forward $\omega$s. We discuss the kinematics of backward production and consider the detector requirements for experimental study.

arXiv comment11 pages, 8 figures

References in corpus (23)

• The Physics of Ultraperipheral Collisions at the LHC
• Electron-Ion Collider in China
• Exclusive Vector Meson Production in Relativistic Heavy Ion Collisions
• STARlight: A Monte Carlo simulation program for ultra-peripheral collisions of relativistic ions
• The Large Hadron-Electron Collider at the HL-LHC
• Can Gluons Trace Baryon Number?
• Diffractive Electroproduction of rho and phi Mesons at HERA
• Photonuclear and Two-photon Interactions at High-Energy Nuclear Colliders
• Baryon Number Transport via Gluonic Junctions
• Coherent diffractive photoproduction of ${\rho }^0$ mesons on gold nuclei at RHIC
• Particle Production via Strings and Baryon Stopping within a Hadronic Transport Approach
• Photoproduction of the $\omega$ meson off the proton near threshold
• DRAFT: Photoproduction of the ${\rho }^0$ meson on the proton at large momentum transfer
• Measurement of Elastic omega Photoproduction at HERA
• Baryon Junction Loops in HIJING/BBv2.0 and the Baryon/Meson Anomaly at RHIC
• Exclusive vector meson production at an electron-ion collider
• Transition distribution amplitudes and hard exclusive reactions with baryon number transfer
• Photoproduction of charged final states in ultra-peripheral collisions and electroproduction at an electron-ion collider
• Progress and Opportunities in Backward angle (u-channel) Physics
• QCD description of backward vector meson hard electroproduction
• Backward-angle photoproduction of $\omega$ and ${\eta }^{\prime }$ mesons from protons at $E_{\gamma }=1.5-3.0$ GeV
• Baryon stopping as a relativistic Markov process in phase space
• Unitarity constraints on meson electroproduction at backward angles

Cited by in corpus (5)

• The Present and Future of QCD
• The Nucleon Energy Correlators
• Search for baryon junctions in photonuclear processes and isobar collisions at RHIC
• Search for baryon junctions in e+A collisions at the Electron Ion Collider
• Tracking the baryon number with nuclear collisions