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A Study of the hadronic resonance structure in the decay tau ---> 3 pi neutrino(tau)

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Abreu, P. [--] Cortina Gil, Eduardo [UCL] DELPHI Collaboration [--]

The hadronic structure of the decay of the τ lepton to three charged particles, τ→3πντ, is studied using data collected by the DELPHI detector at LEP between 1992 and 1995. The invariant mass of the 3π system, m3π, is fitted using the models of Kühn and Santamaria, Isgur, Morningstar and Reader, and Feindt. The 3π and π+π− mass spectra are compared with each model. Below View the MathML source, all are in good qualitative agreement. Above View the MathML source, anomalous behaviour is observed, consistent with the existence of a hitherto unseen decay mode of the τ through a radial excitation of the a1 meson.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 1998
Language Anglais
Journal information "Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics" - Vol. 426, no.3-4, p. 411-427 (1998)
Peer reviewed yes
Publisher Elsevier BV * North-Holland ((Netherlands) Amsterdam)
issn 0370-2693
e-issn 1873-2445
Publication status Publié
Affiliation UCL - SST/IRMP - Institut de recherche en mathématique et physique
Links
Bibliographic reference Abreu, P. ; Cortina Gil, Eduardo ; DELPHI Collaboration. A Study of the hadronic resonance structure in the decay tau ---> 3 pi neutrino(tau) . In: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 426, no.3-4, p. 411-427 (1998)
Permanent URL http://hdl.handle.net/2078.1/123371