O. Nachtmann

activity

20242026

collaborators

5 papers

hep-ph2026

Production of $I ¨ ^{+} I ¨ ^{-}$ pairs in diffractive photon-proton and in proton-proton collisions revisited, in particular concerning the Drell-SÃ¶ding contribution

Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek

We discuss the exclusive photoproduction of $I ¨ ^{+} I ¨ ^{-}$ pairs in photon-proton and in proton-proton collisions at high energies. The $I ¨ ^{0}$ , $I ¨ $ , $f_{2} (1270)$ , and non-reson…

hep-ph2025

Central exclusive production of $I^\cdot$ and $I^\cdot^{'}$ mesons in diffractive proton-proton collisions at the LHC within the tensor-pomeron approach

Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek

We present a study of the central exclusive production (CEP) of $I^\cdot$ and $I^\cdot^{'} (958)$ mesons in diffractive proton-proton collisions at high energies. The amplitudes, including pomer…

hep-ph2024

Soft-photon theorem for pion-proton elastic scattering revisited

Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek

We discuss the reactions $I ¨ p \to I ¨ p$ and $I ¨ p \to I ¨ p I^^{3}$ from a general quantum field theory (QFT) point of view, describing these reactions in QCD and lowest relevant order of…

hep-ph2024

High-energy $I ¨ I ¨ $ scattering without and with photon radiation

Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek

We discuss the processes $I ¨ I ¨ \to I ¨ I ¨ $ and $I ¨ I ¨ \to I ¨ I ¨ I^^{3}$ from a general quantum field theory (QFT) point of view. We study the soft-photon limit where the photon energy $Ï\to…

hep-ph2024

Different versions of soft-photon theorems exemplified at leading and next-to-leading terms for pion-pion and pion-proton scattering

Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek

We investigate the photon emission in pion-pion and pion-proton scattering in the soft-photon limit where the photon energy $I ¨ \to 0$ . The expansions of the $Ï^{-} Ï^{0} \to Ï^{…

Production of I¨+I¨− pairs in diffractive photon-proton and in proton-proton collisions revisited, in particular concerning the Drell-SÃ¶ding contribution

Central exclusive production of I^⋅ and I^⋅′ mesons in diffractive proton-proton collisions at the LHC within the tensor-pomeron approach

Soft-photon theorem for pion-proton elastic scattering revisited

High-energy I¨I¨ scattering without and with photon radiation

Different versions of soft-photon theorems exemplified at leading and next-to-leading terms for pion-pion and pion-proton scattering

Production of $I ¨ ^{+} I ¨ ^{-}$ pairs in diffractive photon-proton and in proton-proton collisions revisited, in particular concerning the Drell-SÃ¶ding contribution

Central exclusive production of $I^\cdot$ and $I^\cdot^{'}$ mesons in diffractive proton-proton collisions at the LHC within the tensor-pomeron approach

High-energy $I ¨ I ¨ $ scattering without and with photon radiation