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Exclusive central diffractive production of scalar, pseudoscalar and vector mesons | | Piotr Lebiedowicz
; Otto Nachtmann
; Antoni Szczurek
; | | Date: |
1 Oct 2014 | | Abstract: | We discuss exclusive central diffractive production of scalar ($f_{0}(980)$,
$f_{0}(1370)$, $f_{0}(1500)$), pseudoscalar ($eta$, $eta’(958)$), and vector
($
ho^{0}$) mesons in proton-proton collisions. The amplitudes are formulated
in terms of effective vertices required to respect standard rules of Quantum
Field Theory and propagators for the exchanged pomeron and reggeons. Different
pomeron-pomeron-meson tensorial (vectorial) coupling structures are possible in
general. In most cases two lowest orbital angular momentum - spin couplings are
necessary to describe experimental differential distributions. For the
$f_{0}(980)$ and $eta$ production the reggeon-pomeron, pomeron-reggeon, and
reggeon-reggeon exchanges are included in addition, which seems to be necessary
at relatively low energies. The theoretical results are compared with the WA102
experimental data, in order to determine the model parameters. For the
$
ho^{0}$ production the photon-pomeron and pomeron-photon exchanges are
considered. The coupling parameters of tensor pomeron and/or reggeon are fixed
from the H1 and ZEUS experimental data of the $gamma p o
ho^{0} p$
reaction. We present first predictions of this mechanism for $pp o pp pi^{+}
pi^{-}$ reaction being studied at COMPASS, RHIC, Tevatron, and LHC.
Correlation in azimuthal angle between outgoing protons and distribution in
pion rapidities at $sqrt{s} = 7$TeV are presented. We show that high-energy
central production of mesons could provide crucial information on the spin
structure of the soft pomeron. | | Source: | arXiv, 1410.0234 | | Services: | Forum | Review | PDF | Favorites | |
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