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Exclusive production of pi+ pi- pairs in proton-proton and proton-antiproton collisions | | Piotr Lebiedowicz
; Antoni Szczurek
; | | Date: |
26 Aug 2010 | | Abstract: | We report on a detailed investigation of four-body $p p o p p pi^+ pi^-$
and $p ar{p} o p ar{p} pi^+ pi^-$) reactions which constitute an
irreducible background to three-body processes $p p o p p M$, where $M$ is a
broad resonance in the $pi^+ pi^-$ channel, e.g. $M=sigma,
ho^{0},
f_{0}(980), f_{2}(1275), f_{0}(1500)$. We include double-diffractive
contribution (both pomeron and reggeon exchanges) as well as the pion-pion
rescattering contributions. The first process dominates at higher energies and
small pion-pion invariant masses while the second becomes important at lower
energies and higher pion-pion invariant masses. We compare our results with the
experimental data. We make predictions for future experiments at PANDA, RHIC,
Tevatron and LHC energies. The two-dimensional distribution in rapidity space
of pions $(y_{pi^+}, y_{pi^-})$ is particularly interesting. The higher the
incident energy, the higher preference for the same-hemisphere emission of
pions. The processes considered constitute a sizeable contribution to the total
nucleon-nucleon cross section as well as to pion inclusive cross section. | | Source: | arXiv, 1008.4469 | | Services: | Forum | Review | PDF | Favorites | |
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