Modification of pi pi Amplitudes and Position of the sigma Pole

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F14%3A00433599" target="_blank" >RIV/61389005:_____/14:00433599 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.5506/APhysPolB.45.1549" target="_blank" >http://dx.doi.org/10.5506/APhysPolB.45.1549</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5506/APhysPolB.45.1549" target="_blank" >10.5506/APhysPolB.45.1549</a>

Result language
angličtina
Original language name
Modification of pi pi Amplitudes and Position of the sigma Pole
Original language description
Meson-meson interaction amplitudes especially pi pi scattering amplitudes are often used incorrectly. It also applies to parameters of the sigma meson. This causes two significant problems: threshold behavior and position of the sigma pole which is suspicious. We modified multichannel S- and P-wave amplitudes for the pi pi scattering, using dispersion relations with imposed crossing symmetry condition. The amplitudes are modified in the low-energy region to improve their consistency with experimental data and the dispersion relations. Agreement with data is achieved for the both amplitudes from the threshold up to 1.8 GeV and with dispersion relations up to 1.1 GeV. Consequences of the applied modifications, e.g. changes of the S-wave lowest-pole positions, are presented.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BE - Theoretical physics
OECD FORD branch
—

Project
<a href="/en/project/GAP203%2F12%2F2126" target="_blank" >GAP203/12/2126: Microscopic models for the description of hadronic systems</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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