Pole position of the a_1 (1260) from tau-decay

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dc.contributor.authorMikhasenko, M.
dc.contributor.authorPilloni, A.
dc.contributor.authorJackura, A.
dc.contributor.authorAlbadalejo, M.
dc.contributor.authorFernández Ramírez, César
dc.contributor.authorMathieu, Vincent
dc.contributor.authorNys, J.
dc.contributor.authorRodas Bilbao, Arkaitz
dc.contributor.authorKetzer, B.
dc.contributor.authorSzczepaniak, Adam P.
dc.date.accessioned2023-06-17T13:19:00Z
dc.date.available2023-06-17T13:19:00Z
dc.date.issued2018-11-28
dc.description© American Physical Society. This work was supported by the German Bundesministerium für Bildung und Forschung, the U.S. Department of Energy under Grants No. DE-AC05-06OR23177 and No. DE-FG02-87ER40365, Research Foundation—Flanders (FWO), PAPIIT-DGAPA (UNAM, Mexico) under Grants No. IA101717 and No. IA101819, CONACYT(Mexico)underGrantNo.251817,U.S.National Science Foundation under Grant No. PHY-1415459,Ministerio de Ciencia, Innovación y Universidades (Spain) Grants No. FPA2016-77313-P and No. FPA2016-75654-C2-2-P, and Universidad Complutense de Madrid.
dc.description.abstractWe perform an analysis of the three-pion system with quantum numbers J(PC) = 1(++) thornthorn produced in the weak decay of tau leptons. The interaction is known to be dominated by the axial meson alpha(1) (1260). We build a model based on approximate three-body unitary and fix the free parameters by fitting it to the ALEPH data on tau- -> pi(-)pi(+)pi(-)nu(tau) decay. We then perform the analytic continuation of the amplitude to the complex energy plane. The singularity structures related to the pi pi subchannel resonances are carefully addressed. Finally, we extract the alpha(1) (1260) pole position m(p)((a1(1260)) - i Gamma((a1(1260))(p) /2 with m(p)((a1(1260)) = (1209 +/- 4(-9)(+12)) MeV, Gamma((a1(1260))(p) = (576 +/- 11(-20)(+89)) MeV.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.sponsorshipGerman Bundesministerium fur Bildung und Forschung
dc.description.sponsorshipResearch Foundation-Flanders (FWO)
dc.description.sponsorshipUniversidad Complutense de Madrid
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/50806
dc.identifier.doi10.1103/PhysRevD.98.096021
dc.identifier.issn2470-0010
dc.identifier.officialurlhttp://dx.doi.org/10.1103/PhysRevD.98.096021
dc.identifier.relatedurlhttps://journals.aps.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/13024
dc.issue.number9
dc.journal.titlePhysical review D
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.projectID(FPA2016-77313-P; FPA2016-75654-C2-2-P)
dc.rights.accessRightsopen access
dc.subject.cdu51-73
dc.subject.keywordA1
dc.subject.keywordSingularities
dc.subject.keywordScattering
dc.subject.keywordUnitarity
dc.subject.ucmFísica-Modelos matemáticos
dc.subject.ucmFísica matemática
dc.titlePole position of the a_1 (1260) from tau-decay
dc.typejournal article
dc.volume.number98
dspace.entity.typePublication
relation.isAuthorOfPublication51733d00-4a0c-402c-8870-a26d1b00ea00
relation.isAuthorOfPublication17de49b7-46a8-4bce-b8df-ee29abc569d8
relation.isAuthorOfPublication4eca272b-1469-482b-81af-0100045cbaed
relation.isAuthorOfPublication.latestForDiscovery51733d00-4a0c-402c-8870-a26d1b00ea00
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