Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Exclusive scalar \mbox{\boldmath $f_0(1500)$} meson production

Not scheduled
Auditorium Maximum (Kraków, Poland)

Auditorium Maximum

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Poster session

Speaker

Piotr Lebiedowicz (Institute of Nuclear Physics)

Description

We evaluate differential distributions for exclusive scalar $f_0(1500)$ meson (glueball candidate) production for $p \bar p \to N_1 N_2 f_0$ and $p p \to p p f_0$. %Several mechanisms were considered, including gluonic diffractive, Both gluon induced diffractive, pion-pion meson exchange current (MEC) components as well as double-diffractive mechanism with intermediate pionic loop are calculated for the first time in the literature. The pion-pion component, which can be reliably calculated, dominates close to the threshold while the gluonic diffractive or double-diffractive with pionic triangle components may take over only for larger energies. At the moment only upper limit for the gluonic diffractive component can be obtained. The gluonic diffractive component is calculated based on two-gluon impact factors as well as in the framework of Khoze-Martin-Ryskin approach proposed for diffractive Higgs boson production. Different unintegrated gluon distribution functions (UGDFs) from the literature are used. Rather large cross sections due to pion-pion fusion are predicted for PANDA energies, where the gluonic mechanism is shown to be negligible. The production of $f_0(1500)$ close to threshold could limit the so-called $\pi NN$ form factor in the region of larger pion virtualities. We discuss in detail the two-pion background to the production of the $f_0(1500)$ meson. We include both two-pion rescattering background ($\rho$-reggeon exchange) and double-diffractive two-pion background (both pomeron and reggeon exchanges). The amplitudes are calculated in the Regge approach. Our calculation shows that imposing extra cuts should allow to extract the signal of the glueball $f_{0}(1500)$ candidate at the highest PANDA energy. We compare our results with the existing data of the WA102 Collaboration.

Primary author

Piotr Lebiedowicz (Institute of Nuclear Physics)

Co-author

Antoni Szczurek (Institute of Nuclear Physics)

Presentation materials

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