Exclusive diffractive production of π⁺ π^- pairs within tensor pomeron approach

2016/06/29 by Piotr Lebiedowicz, Lebiedowicz, Piotr, Otto Nachtmann +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1606.09046

openalex publication_date 2016/06/29 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28

Abstract

We discuss exclusive central diffractive production of π⁺ π^- in proton-(anti)proton collisions at high energies. Based on a tensor pomeron model we present results of the purely diffractive dipion continuum, the scalar f₀(500), f₀(980) and tensor f₂(1270) resonances decaying into the π⁺ π^- pairs as well as the photoproduction mechanism (ρ⁰, Drell-Söding). We discuss how two pomerons couple to the tensor meson f₂(1270) and the interference effects of resonance and dipion continuum contributions. The theoretical results are compared with existing STAR, CDF, and CMS experimental data. Predictions for planned or being carried out experiments (ALICE, ATLAS) are presented. We find that the relative contribution of resonant f₂(1270) and dipion continuum strongly depend on the cut on proton transverse momenta (or four-momentum transfer squared t_1,2) which may explain some controversial observations made by different ISR experiments in the past. The cuts may play then the role of a ππ resonance filter.

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