Exclusive $pp \to nn π^{+}π^{+}$ reaction at LHC and RHIC

Details Exclusive $pp \to nn π^{+}π^{+}$ reaction at LHC and RHIC Exclusive $pp \to nn π^{+}π^{+}$ reaction at LHC and RHIC

2010-05-13

arxiv.org/abs/1005.2309v3

Phys.Rev.D83:076002,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 18 figures, calculations have been corrected, new processes added, discussion expanded in print in Phys. Rev.D

Scientific paper

10.1103/PhysRevD.83.076002

We evaluate differential distributions for the four-body $p p \to n n \pi^+ \pi^+$ reaction. The amplitude for the process is calculated in the Regge approach including many diagrams. We make predictions for possible future experiments at RHIC and LHC energies. Very large cross sections are found which is partially due to interference of a few mechanisms. Presence of several interfering mechanisms precludes extraction of the elastic $\pi^+ \pi^+$ scattering cross section. Absorption effects are estimated. Differential distributions in pseudorapidity, rapidity, invariant two-pion mass, transverse-momentum and energy distributions of neutrons are presented for proton-proton collisions at $\sqrt{s}$ = 500 GeV (RHIC) and $\sqrt{s}$ = 0.9, 2.36 and 7 TeV (LHC). Cross sections with experimental cuts are presented.

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