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| Campo DC | Valor | Lengua/Idioma |
|---|---|---|
| dc.provenance | CONICET | - |
| dc.creator | Hoferichter, Martin | - |
| dc.creator | Phillips, Daniel R. | - |
| dc.creator | Schat, Carlos Luis | - |
| dc.date | 2018-08-27T14:35:46Z | - |
| dc.date | 2018-08-27T14:35:46Z | - |
| dc.date | 2011-09 | - |
| dc.date | 2018-08-24T13:44:14Z | - |
| dc.date.accessioned | 2019-04-29T15:36:54Z | - |
| dc.date.available | 2019-04-29T15:36:54Z | - |
| dc.date.issued | 2011-09 | - |
| dc.identifier | Hoferichter, Martin; Phillips, Daniel R.; Schat, Carlos Luis; Roy-Steiner equations for γγ→ππ; Springer; European Physical Journal C: Particles and Fields; 71; 9; 9-2011; 1-28 | - |
| dc.identifier | 1434-6044 | - |
| dc.identifier | http://hdl.handle.net/11336/57160 | - |
| dc.identifier | CONICET Digital | - |
| dc.identifier | CONICET | - |
| dc.identifier.uri | http://rodna.bn.gov.ar:8080/jspui/handle/bnmm/297779 | - |
| dc.description | Starting from hyperbolic dispersion relations, we derive a system of Roy-Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry. It thus maintains all symmetries of the underlying quantum field theory. To suppress the dependence of observables on high-energy input, we also consider once- and twice-subtracted versions of the equations, and identify the subtraction constants with dipole and quadrupole pion polarizabilities. Based on the assumption of Mandelstam analyticity, we determine the kinematic range in which the equations are valid. As an application, we consider the resolution of the γγ→ππ partial waves by a Muskhelishvili-Omnès representation with finite matching point. We find a sum rule for the isospin-two S-wave, which, together with chiral constraints, produces an improved prediction for the charged-pion quadrupole polarizability (α2-β2)π± = (15.3±3.7)× 10-4 fm5. We investigate the prediction of our dispersion relations for the two-photon coupling of the σ-resonance Γσγγ. The twice-subtracted version predicts a correlation between this width and the isospin-zero pion polarizabilities, which is largely independent of the high-energy input used in the equations. Using this correlation, the chiral perturbation theory results for pion polarizabilities, and our new sum rule, we find Γσγγ=(1.7±0.4) keV. © 2011 Springer-Verlag / Società Italiana di Fisica. | - |
| dc.description | Fil: Hoferichter, Martin. Universitat Bonn; Alemania. Ohio University; Estados Unidos | - |
| dc.description | Fil: Phillips, Daniel R.. Ohio University; Estados Unidos | - |
| dc.description | Fil: Schat, Carlos Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina | - |
| dc.format | application/pdf | - |
| dc.format | application/pdf | - |
| dc.language | eng | - |
| dc.publisher | Springer | - |
| dc.relation | info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1140/epjc/s10052-011-1743-x | - |
| dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1140/epjc/s10052-011-1743-x | - |
| dc.rights | info:eu-repo/semantics/openAccess | - |
| dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | - |
| dc.source | reponame:CONICET Digital (CONICET) | - |
| dc.source | instname:Consejo Nacional de Investigaciones Científicas y Técnicas | - |
| dc.source | instacron:CONICET | - |
| dc.source.uri | http://hdl.handle.net/11336/57160 | - |
| dc.subject | Roy equations | - |
| dc.subject | dispersion relations | - |
| dc.subject | chiral perturbation theory | - |
| dc.subject | Astronomía | - |
| dc.subject | Ciencias Físicas | - |
| dc.subject | CIENCIAS NATURALES Y EXACTAS | - |
| dc.title | Roy-Steiner equations for γγ→ππ | - |
| dc.type | info:eu-repo/semantics/article | - |
| dc.type | info:eu-repo/semantics/publishedVersion | - |
| dc.type | info:ar-repo/semantics/articulo | - |
| Aparece en las colecciones: | CONICET | |
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