Monday, July 1, 2013

1306.6819 (Piotr Lebiedowicz et al.)

Exclusive diffractive photon bremsstrahlung at high energies    [PDF]

Piotr Lebiedowicz, Antoni Szczurek
We discuss the $p p \to p p \gamma$ reaction at the LHC. We consider diffractive classical bremsstrahlung mechanisms including effects of non point-like nature of protons. In addition, we take into account (vector meson)-pomeron, photon-pion as well as photon-pomeron exchange processes for the first time in the literature. The integrated diffractive bremsstrahlung cross section ($E_{\gamma}>100$ GeV) is only of the order of $\mu$b. We try to identify regions of the phase space where one of the mechanisms dominates. The classical bremsstrahlung dominates at large forward/backward photon pseudorapidities, close to the pseudorapidities of scattered protons. In contrast, the photon-pomeron (pomeron-photon) mechanism dominates at midrapidities but the related cross section is rather small. In comparison the virtual-omega--rescattering mechanism contributes at smaller angles of photons (larger photon rapidities).
View original:

No comments:

Post a Comment